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SALICYLIC ACID AS A SALINE STRESS ATTENUATOR IN THE PHYSIOLOGICAL QUALITY OF Erythrina velutina SEEDS 水杨酸在红草种子生理品质中的生理胁迫衰减作用
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-14 DOI: 10.1590/1806-908820210000021
J. S. Nóbrega, T. I. Silva, Ronimeire Torres da Silva, Maria de Fátima de Queiroz Lopes, F. Figueiredo, R. Bruno
ABSTRACT Salinity is one of the problems that limit plant development, with the germination, growth, and initial establishment stages being the most sensitive to saline stress. Erythrina velutina, popularly known as “mulungu” in Brazil, is a species native to the Caatinga biome, which grows in conditions of soil rich in salts. The damage caused by salinity to the quality of its seeds and the use of techniques that mitigate such effects are little known. Thus, this work aimed to evaluate salicylic acid as a mitigator of saline stress in the physiological quality of mulungu seeds. The quality of two seed lots from two Brazilian states (L1: Mossoró, Rio Grande do Norte, and L2: Pentencostes, Ceará) was evaluated. A completely randomized design in a 2 (seed soaking with salicylic acid (SA) - distilled water and 1.0 mM SA) × 4 (electrical conductivity of irrigation water - ECw - 0.0, 3.0, 6.0 and 9.0 dS m-1) factorial scheme with four replications of 50 seeds each was used. Saline stress reduces the quality of mulungu seeds and seedlings. SA increases the vigor of the seeds, promoting improvements in germination under saline conditions.
盐胁迫是制约植物发育的重要因素之一,萌发、生长和初生阶段对盐胁迫最为敏感。在巴西俗称“mulungu”的Erythrina velutina是Caatinga生物群系的一种原生物种,生长在富含盐分的土壤条件下。盐碱对其种子质量造成的损害以及减轻这种影响的技术的使用鲜为人知。因此,本研究旨在评价水杨酸作为盐胁迫缓解剂对木龙果种子生理品质的影响。对来自巴西两个州的两个种子批次(L1: Mossoró,里约热内卢Grande do Norte, L2: Pentencostes, cerar )的质量进行了评估。采用2(水杨酸(SA) -蒸馏水和1.0 mM SA浸泡种子)× 4(灌溉水电导率- ECw - 0.0、3.0、6.0和9.0 dS - m-1)因子设计,4个重复,每个重复50粒种子。盐胁迫降低了木龙骨种子和幼苗的质量。SA增加了种子的活力,促进了在盐水条件下萌发的改善。
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引用次数: 0
UNDERSTANDING THE DYNAMICS OF THE BRAZILIAN MARKET FOR NATIVE FOREST WOOD: A CASE STUDY FOR MINAS GERAIS STATE, BRAZIL 了解巴西原生森林木材市场的动态:以巴西米纳斯吉拉斯州为例
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-14 DOI: 10.1590/1806-908820210000018
T. G. V. Martins, G. Reis, M. F. Reis, R. Leite, L. A. A. Telles, G. G. C. Mendes, M. Lage, D. L. Pinto, Thamires de Souza Carvalho, Hiohanes Moura Cardoso, A. S. Lorenzon, Douglas Vinícius Vaz Martins
ABSTRACT Understanding the Brazilian market for native wood helps forest managers and can guide conservation policies. This study aimed to evaluate the spatial and temporal distribution of supply and demand of the Brazilian native wood for four products namely, charcoal, roundwood, firewood, and sawn wood. We used the consumed wood volume from 2006 to 2016 in Minas Gerais (MG) tracking its supplier in Brazil accounting for 31 million cubic meters. These data were used as input for calculating mean centers and performing grouping analysis. The wood supply centers for the energy sector in Brazil have moved from Cerrado to the Caatinga biome. This change is consistent with historical patterns of agricultural expansion in Brazil. The largest mesoregions producing wood were: East of Mato Grosso do Sul State, South of Goiás State, and Center-South of Bahia State. The solid wood supply centers have moved from the North to Midwest regions but remained within the Amazon biome for almost all the years. This pattern is likely a consequence of timber regulation practices in the Amazon. The mesoregions: Madeira-Guaporé and East of Rondônia State, Southeast and Northeast of Pará State, and North of Mato Grosso State were the most important suppliers of solid wood to MG. Wood consumption for energy is centered in the Center and North regions of MG State, especially in Sete Lagoas, a hub of pig iron and cement industries. Solid wood products are dispersed in MG State, being Belo Horizonte, Conselheiro Lafaiete, Ubá, and Uberlândia the distribution centers of native wood for the furniture industry within MG. The spatial statistics helped to exploit the activity of the native wood market in Brazil and provides essential information for decision-makers that was not previously available.
了解巴西本土木材市场有助于森林管理者并指导保护政策。本研究旨在评估巴西原生木材(木炭、圆木、柴火和锯材)四种产品的供需时空分布。我们使用了米纳斯吉拉斯州(MG) 2006年至2016年消耗的木材量,追踪其在巴西的供应商,占3100万立方米。这些数据被用作计算平均中心和进行分组分析的输入。巴西能源部门的木材供应中心已经从塞拉多转移到卡廷加生物群落。这种变化与巴西农业扩张的历史模式是一致的。最大的木材生产地区是:南马托格罗索州东部,Goiás州南部和巴伊亚州中南部。实木供应中心已经从北部转移到中西部地区,但几乎所有年份都留在亚马逊生物群系内。这种模式很可能是亚马逊地区木材管理实践的结果。马德拉-瓜波尔和Rondônia州东部、帕尔州东南部和东北部以及马托格罗索州北部是MG最重要的实木供应地。木材能源消耗主要集中在MG州的中部和北部地区,特别是在Sete Lagoas,生铁和水泥工业的中心。实木产品分散在MG州,包括贝洛奥里藏特、Conselheiro Lafaiete、ub和uberl印度,这些都是MG家具行业的本地木材配送中心。空间统计数据有助于开发巴西本土木材市场的活动,并为决策者提供了以前无法获得的重要信息。
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引用次数: 0
BIOLOGICAL CONTROL IN LEAF-CUTTING ANTS, Atta sexdens (HYMENOPTERA: FORMICIDAE), USING PATHOGENIC FUNGI 病原真菌对切叶蚁(膜翅目:蚁科)的生物防治
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-09 DOI: 10.1590/1806-908820210000016
Tarcísio Marcos Macedo Mota Filho, Luis Eduardo Pontes Stefanelli, R. S. Camargo, C. Matos, L. C. Forti
ABSTRACT Chemical control using toxic baits containing the active ingredient sulfluramid at 0.3% (w/w) is the main method for controlling leaf-cutting ants of the genera Atta and Acromyrmex. However, since 2009, when sulfluramid was included in Annex B of the Stockholm Convention on Persistent Organic Pollutants, there has been an intense search for new methods that are efficient in controlling these insects. Among said new methods, biological control using pathogenic fungi has shown promising results in laboratory conditions. The objective of this study, given the context presented, was to assess the potential of the fungi Beauveria bassiana and Trichoderma harzianum in controlling Atta sexdens. Colonies of A. sexdens were exposed to the fungi by means of formulated baits provided in a foraging chamber, or of suspensions sprayed on the fungus garden, and had their behavioral changes recorded for 21 days. For both formulations, concentrations of 10 and 20% (w/w) of the fungi being studied were used. The results allowed concluding that baits containing 10 and 20% (w/w) of the fungi B. bassiana and T. harzianum were not efficient in controlling colonies of A sexdens. On the other hand, spraying suspensions of 20% (w/w) of B. bassiana and 10% and 20% (w/w) of T. harzianum was efficient and resulted in 100% mortality of the colonies 11, 9 and 7 days after application, respectively. These findings indicate that the fungi B. bassiana and T. harzianum are promising as agents for the control of A. sexdens colonies, when sprayed on the fungus garden, although there are still some challenges as to their use related to the development of technologies for the application of the pathogen.
摘要采用含有0.3% (w/w)有效成分氟虫胺的毒饵进行化学防治是防治切叶蚁和切叶蚁的主要方法。然而,自2009年氟虫胺被列入《关于持久性有机污染物的斯德哥尔摩公约》附件B以来,人们一直在积极寻找有效控制这些昆虫的新方法。在这些新方法中,利用病原真菌的生物防治在实验室条件下显示出有希望的结果。本研究的目的,鉴于所提出的背景,是评估真菌白僵菌和哈茨木霉在控制阿塔蝇方面的潜力。在采集室内放置配制好的饵料,或在菌圃上喷洒悬浮液,对雄性姬蜂的菌落进行21天的暴露,记录其行为变化。对于这两种配方,所研究的真菌的浓度分别为10%和20% (w/w)。结果表明,含10%和20% (w/w)球孢白僵菌和哈兹黑僵菌的饵料对黄僵菌的控制效果不佳。另一方面,20% (w/w)球孢白僵菌和10%、20% (w/w)哈兹黑僵菌喷施悬浮液效果较好,施药后第11天、第9天和第7天菌落死亡率均为100%。这些结果表明,球孢白僵菌和哈兹芽孢杆菌在真菌园喷洒时具有良好的防治雄蚜菌落的潜力,但由于病原菌应用技术的发展,其应用仍面临一些挑战。
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引用次数: 6
SLUDGE FROM RICE PARBOILING WASTEWATER TREATMENT PLANT AS ALTERNATIVE SUBSTRATE FOR THE PRODUCTION OF Araucaria angustifolia SEEDLINGS 水稻沸煮废水处理厂污泥作为生产紫砂苗的替代基质
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-02 DOI: 10.1590/1806-908820210000010
Veridiana Neitzke Bull, F. K. Pilatti, Elisane Schwartz, F. F. Cassana
ABSTRACT The sludge produced by rice parboiling wastewater treatment plants has substantial amounts of nutrients and organic matter, therefore requiring proper environmental disposal. One option is to use it as an alternative substrate for the production of forest species seedlings. This study aimed to assess the viability of using the sludge from rice parboiling wastewater as an alternative substrate for the production of Araucaria angustifolia (Bertol.) O. Kuntze seedlings. A. angustifolia seeds were kept in vermiculite until sprouting, then transferred to polyethylene bags filled with five different substrates (treatments): 100% sand (T1); 75% sand and 25% sludge (T2); 50% sand and 50% sludge (T3); 25% sand and 75% sludge (T4); 100% sludge (T5). Each treatment had 10 replicates (bag with one seedling). Shoot system growth, hypocotyl diameter, root system growth and biomass were evaluated at 94, 180, and 300 days of growth. Data were subjected to Analysis of Variance (ANOVA) followed by Tukey test with a significance level of 5%. Seedlings’ growth was similar on treatments containing 25%, 50%, and 75% sludge, while 100% sand and 100% sludge resulted in less growth at 300 days. In conclusion, the sludge from rice parboiling wastewater is suitable as an alternative substrate, and the ratio of 25% sand + 75% sludge could be recommended, for exploit larger amounts of the residue.
稻谷沸煮废水处理厂产生的污泥含有大量的营养物质和有机物,因此需要适当的环境处理。一种选择是将其用作生产森林物种幼苗的替代基质。本研究的目的是评估利用大米沸腾废水中的污泥作为生产阿劳卡aria angustifolia (Bertol.)的替代底物的可行性。O. Kuntze幼苗。在蛭石中保存安瓜种子直到发芽,然后转移到聚乙烯袋中,装满五种不同的基质(处理):100%沙子(T1);75%砂和25%污泥(T2);50%砂和50%污泥(T3);25%砂75%泥(T4);100%污泥(T5)。每个处理10个重复(每袋1株苗)。在生长94、180和300 d时,测定茎系生长、下胚轴直径、根系生长和生物量。数据进行方差分析(ANOVA),然后进行Tukey检验,显著性水平为5%。含沙量为25%、50%和75%的处理幼苗生长相似,而含沙量为100%和含沙量为100%的处理幼苗生长较差。综上所述,稻谷沸煮废水污泥可作为替代基质,建议采用25%的砂+ 75%的污泥的比例,以开发更大量的残渣。
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引用次数: 0
POLYPHENOL CONTENT AND ANTIOXIDANT POTENTIAL OF Allophylus edulis (A. St.-Hil. et al.) Hieron. ex Niederl. AND Cupania vernalis Cambess. (SAPINDACEAE) edulis异门(A.St.-Hil.等)的多酚含量和抗氧化潜力。前Niederl。和金龟子。(智齿目)
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-02 DOI: 10.1590/1806-908820210000007
A. Sobottka, Elisandra Tessaro, S. M. Silva, Marina Pedron, Lara Tortini Seffrin
ABSTRACT Allophylus edulis and Cupania vernalis (Sapindaceae) are Brazilian native trees used as medicinal plants for the treatment of respiratory, digestive, circulatory, and skin diseases. Ubiquitously distributed in the Brazilian territory, these species are indicated for mixed plantations aimed at the recovery of degraded ecosystems. In this study, the total phenolic content (TPC) and total flavonoid content (TFC), and the antioxidant activity of extracts and fractions obtained from A. edulis and C. vernalis leaves were assessed. The TPC and TFC was determined spectrophotometrically. Antioxidant activity was evaluated through radical scavenging activity of 2,2-diphenyl-1-picrylhydrazyl (DPPH). The extracts were obtained by two methods: maceration (method 1) and Soxhlet (method 2). Solvents of increasing polarity (hexane, dichloromethane, ethyl acetate, and n-butanol) were used to obtained the fractions. The results showed that the ethyl acetate fraction from A. edulis, obtained from the maceration method, had the highest TPC (442.0 ± 18.2 mg GAE g-1) and TFC (58.1 ± 0.4 mg RUE g-1), and antioxidant activity (EC50 = 43.6 ± 2.6 µg mL-1). By C. vernalis, superior results were obtained with the n-butanol fraction (TPC = 126.1 ± 5.8 mg GAE g-1, TFC = 37.7 ± 0.6 mg RUE g-1). The highest antioxidant potential was found in the crude hydroalcoholic extract (EC50 = 816.1 ± 50.9 µg mL-1) and butanol fraction (1,156.4 ± 3.8 µg mL-1). The results of this study show that the fractions obtained by maceration and liquid-liquid partition with more polar solvents (ethyl acetate and n-butanol) are the richest in TPC and TFC, and presented the greater antioxidant activity. Comparing the two plants, A. edulis showed the best results, with a high content of TPC, TFC, and antioxidant potential, and therefore may be used to treat diseases related to oxidative stress.
摘要:紫外异门(Allophylus edulis)和紫柏(Cupania vernalis)是巴西本土的树木,被用作治疗呼吸、消化、循环和皮肤疾病的药用植物。这些物种普遍分布在巴西境内,适合用于旨在恢复退化生态系统的混合种植园。在本研究中,评估了从A.edulis和C.vernalis叶中提取的提取物和组分的总酚含量(TPC)和总黄酮含量(TFC)以及抗氧化活性。用分光光度法测定TPC和TFC。通过2,2-二苯基-1-苦基肼(DPPH)的自由基清除活性来评价其抗氧化活性。通过两种方法获得提取物:浸渍法(方法1)和索氏法(方法2)。使用极性增加的溶剂(己烷、二氯甲烷、乙酸乙酯和正丁醇)来获得级分。结果表明,通过浸渍法获得的A.edulis的乙酸乙酯组分具有最高的TPC(442.0±18.2 mg GAE g-1)和TFC(58.1±0.4 mg RUE g-1),以及抗氧化活性(EC50=43.6±2.6µg mL-1)。通过C.vernalis,正丁醇部分获得了优异的结果(TPC=126.1±5.8 mg GAE g-1,TFC=3.77±0.6 mg RUE g-1)。在粗水醇提取物(EC50=816.1±50.9µg mL-1)和丁醇部分(1156.4±3.8µg mL-2)中发现了最高的抗氧化潜力。本研究的结果表明,用极性更强的溶剂(乙酸乙酯和正丁醇)浸渍和液-液分配得到的馏分中TPC和TFC含量最丰富,并表现出更高的抗氧化活性。比较这两种植物,A.edulis表现出最好的效果,具有高含量的TPC、TFC和抗氧化潜力,因此可以用于治疗与氧化应激相关的疾病。
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引用次数: 0
GENETIC DIVERSITY IN AMBURANA (Amburana cearensis) ACCESSIONS: HIERARCHICAL AND OPTIMIZATION METHODS 黄颡鱼(AMBURANA cearensis)种质的遗传多样性:层次和优化方法
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-02 DOI: 10.1590/1806-908820210000008
Ana Valéria Vieira de Souza, Jackson Rafael de Sá Carvalho, Evelyn Sophia Silva Costa, C. S. Souza, Herick Fernando de Jesus Silva, J. M. Luz, G. Maciel, A. Siquieroli
ABSTRACT The evaluation of accessions in a germplasm bank is essential for determining the potential parents in conservation programs, especially for native trees. This study aimed to determine the genetic diversity among 68 Amburana cearensis genotypes from different locations in the state of Pernambuco, Brazil. Their genetic patterns were evaluated by Inter Simple Sequence Repeat (ISSR) molecular markers and genetic divergence was evaluated through multivariate analyses using different clustering methods. The optimization method used (Tocher) was in agreement with all the hierarchical models used, in which clustering of the genotypes occurred similarly, specifically for the accession BB116, which is an important genetic material to be preserved and studied. Among the various hierarchical methods applied, the Average Linkage method exhibited higher discrimination power, allowing identification of a larger number of divergent groups, thus implying wide genetic diversity among A. cearensis accessions.
摘要对种质库中的材料进行评估对于确定保护计划中的潜在亲本至关重要,尤其是对本土树木而言。本研究旨在确定来自巴西伯南布哥州不同地区的68种雪兰基因型的遗传多样性。用ISSR分子标记评价其遗传模式,并用不同聚类方法进行多元分析评价其遗传差异。所使用的优化方法(Tocher)与所使用的所有层次模型一致,其中基因型的聚类发生相似,特别是对于要保存和研究的重要遗传物质BB116。在应用的各种层次方法中,平均连锁法表现出更高的辨别力,可以识别出更多的不同群体,从而意味着紫檀材料之间存在广泛的遗传多样性。
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引用次数: 1
FOOD PREFERENCE OF Thyrinteina arnobia (Stoll, 1782) (LEPIDOPTERA: GEOMETRIDAE) ON NATIVE AND EXOTIC HOSTS 对本地和外来寄主的食性偏好(鳞翅目:尺蛾科)
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-02 DOI: 10.1590/1806-908820210000011
Camila Alexandre Cavalcante de Almeida, Fernanda da Silva Gonçalves, Matheus Barros Rodrigues, J. M. Santos, M. Breda
ABSTRACT One of the factors that may affect and limit the production in eucalypt plantations is the attack of defoliating insects. Among those, the brown eucalypt caterpillar, Thyrinteina arnobia (Stoll, 1782) (Lepidoptera: Geometridae), stands out for being the major defoliating pest of Eucalyptus spp. in Brazil. Thus, the present study aimed to investigate the food consumption of T. arnobia, in its native host, guava (Psidium guajava L.), and in the different E. urograndis clones (VE 41, I 144, TP 361 and VCC 865). To assess T. arnobia food consumption, choice and non-choice tests were carried out using the native and the exotic host, alone or in combination. In non-choice tests, it was observed a higher consumption for the VE 41 clone and the native host (guava). The food consumption evaluation in choice tests indicated no food preference of T. arnobia between guava and E. urograndis clones, with the exception for the TP 361 clone, which was significantly less consumed than guava. In choice tests between the different E. urograndis clones, the clone I 144 presented a tendency towards lower food preference, being consumed only after 48 hours. In addition, the leaf consumption was similar between the VE 41, I1 14 e VCC 865 clones. In choice tests using the E. urograndis clones in pairs, the VE 41 clone was more consumed while the I 144 clone was less consumed when compared to the TP 361 clone. The obtained results provide basic information for the indication of eucalypt clones, and the understanding of the interaction and ecological relationships, assisting in the development of Forest Integrated Pest Management (Forest IPM) programs for the control of T. arnobia.
影响和限制桉树人工林产量的因素之一是落叶虫的侵袭。其中,棕桉毛虫Thyrinteina arnobia (Stoll, 1782)(鳞翅目:尺蛾科)是巴西桉树属的主要落叶害虫。因此,本研究的目的是研究野野蓟马在其原生寄主番石榴(Psidium guajava L.)和不同的野野蓟马无性系(VE 41、I 144、TP 361和VCC 865)中的食用量。为了评估野蓟马的食物消耗,分别用本地和外来寄主单独或联合进行了选择和非选择试验。在非选择测试中,观察到VE 41克隆和本地宿主(番石榴)的消耗更高。选择试验的食用量评价结果表明,除TP 361无性系的食用量显著低于番石榴外,其他无性系对番石榴的食用量均无偏好。在不同克隆的选择测试中,克隆i144表现出较低的食物偏好,仅在48小时后食用。此外,VCC 865无性系ev41、i1114和VCC 865间的叶片消耗量相似。在选择试验中,与TP 361克隆相比,VE 41克隆消耗更多,而i144克隆消耗较少。研究结果为桉树无性系鉴定提供了基础资料,为桉树无性系间的相互作用和生态关系的认识提供了依据,有助于制定森林有害生物综合防治(Forest IPM)方案。
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引用次数: 1
STRUCTURING AND CHARACTERIZATION OF THE Acacia meanrsii De Wild CHARCOAL PRODUCTION CHAIN IN THE VALLEYS OF CAÍ AND TAQUARI, RS CAÍ和TAQUARI, RS山谷中金合欢野生木炭生产链的结构和特征
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-02 DOI: 10.1590/1806-908820210000013
Flávio Cunha Laureano da Silva, Débora Luana Pasa, Mariane Carrion Ximendes, J. A. D. Farias
ABSTRACT Due to globalization, market evolution, and technological implementations, the production chains have been improving, becoming essential for the consolidation of several products in the market, including charcoal, used as a renewable energy source. Thus, the objective of this work was to characterize the structure of this chain, from the qualitative and quantitative perspective, in the municipalities of the Valleys of Caí and Taquari and the interaction between the actors involved. The methodology was based on the division of the chain into macrosegments, with socioeconomic units of production characterized by the application of questionnaires. As a result, it was verified the presence of the production macrosegment (nursery and reforestation sectors), industrialization (charcoal production and packaging sectors), and commercialization (packaging sector), formed by family units. The packaging segment has outsourced manpower and more technology than the others. It was evidenced that a single socioeconomic unit of production can be part of more than one macrosegment or segment and, allied to this, in general, it is possible to perceive the characterization of a long chain of production. It appears that only 3.8% of charcoal producers also pack and sell their products, the remainder (96.2%) sell their production to packers who standardize the product, making the sale to the final consumer directly or indirectly.
由于全球化、市场发展和技术实施,生产链一直在改善,对市场上几种产品的整合至关重要,包括用作可再生能源的木炭。因此,这项工作的目的是从质和量的角度描述Caí和Taquari山谷市的这一链条的结构以及有关行动者之间的相互作用。该方法基于将链条划分为宏观部分,并以问卷调查的应用为特征的社会经济生产单位。结果,证实了由家庭单位组成的生产宏观部门(苗圃和再造林部门)、工业化(木炭生产和包装部门)和商业化(包装部门)的存在。包装部分外包人力和更多的技术比其他。有证据表明,一个单一的社会经济生产单位可以是一个以上的宏观部门或部门的一部分,与此相关的是,一般来说,有可能感知到长生产链的特征。似乎只有3.8%的木炭生产商也包装和销售他们的产品,其余的(96.2%)将他们的产品卖给包装商,包装商将产品标准化,直接或间接地销售给最终消费者。
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引用次数: 2
PERMEABILIZATION, CELL WALL ULTRASTRUCTURE, AND GERMINATION OF BASIDIOSPORES OF THE ECTOMYCORRHIZAL FUNGUS Pisolithus microcarpus TREATED WITH DIFFERENT COMMERCIAL BRANDS OF BLEACH 不同牌子漂白剂处理外生菌根真菌微果菇的透性、细胞壁超微结构和担子孢子的萌发
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-07-02 DOI: 10.1590/1806-908820210000009
M. Silvério, Jaqueline Maria do Nascimento, J. Serrão, M. Tótola, M. Costa
ABSTRACT Basidiospores of the ectomycorrhizal fungus Pisolithus microcarpus have an impermeable cell wall, a characteristic that is possibly related to the low germination percentages of these propagules, which makes it difficult to obtain monokaryons and use these spores in inoculants. The objective of this study was to evaluate the effect of different concentrations of commercial bleach on the permeabilization of P. microcarpus basidiospores and to analyze the alterations caused in the cell wall ultrastructure and the viability and germination capacity of these propagules. Fungal basidiospores were collected in eucalyptus plantations and permeabilized using different bleach concentrations and exposure times. The basidiospores were then analyzed by scanning and transmission electron microscopy. The percentage of permeabilized basidiospores varied with the commercial brand, bleach concentration, and exposure time. Basidiospores of different basidiocarps differed in susceptibility to permeabilization treatment with bleach. Changes in the ultrastructure of permeabilized basidiospores were observed at bleach concentrations of 15 and 50 % for an exposure time of 40 s, with surface changes and loss of the spicules of the outermost layer of the wall. After permeabilization with 5 % bleach for 40 s, 80 % of the permeabilized spores were viable, resulting in the production of fungal colonies after 15 days of incubation of these propagules in the presence of Corymbia citriodora. However, the germination percentage obtained, 0.001 %, was similar to that of non-permeabilized basidiospores, indicating that other factors, besides cell wall permeability, are determinant for the germination process.
摘要外生菌根真菌Pisolithus microcarpus的担子孢子具有不透水的细胞壁,这可能与这些繁殖体的发芽率低有关,这使得它们难以获得单核细胞并用于接种剂。本研究旨在探讨不同浓度的商品漂白剂对小槭树担子孢子通透性的影响,并分析其细胞壁超微结构、繁殖体活力和萌发能力的变化。在桉树人工林中采集了真菌担子孢子,并用不同的漂白剂浓度和暴露时间进行渗透。然后用扫描电镜和透射电镜对担子孢子进行分析。浸透性担子孢子的百分比随漂白剂的品牌、浓度和暴露时间的不同而变化。不同担子果孢子对漂白剂渗透处理的敏感性不同。在漂白剂浓度为15%和50%、暴露时间为40 s的条件下,观察到透性担子孢子超微结构的变化,表面发生变化,最外层壁的针状体丢失。经5%漂白剂渗透40 s后,80%的渗透孢子存活,这些繁殖体在citriodora存在下孵育15天后产生真菌菌落。然而,获得的萌发率为0.001 %,与未透性的担子孢子相似,这表明除了细胞壁透性外,还有其他因素对萌发过程起决定作用。
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引用次数: 0
SURFACE RUNOFF IN TWO REHABILITATION PERIODS OF A BAUXITE MINE 铝土矿两个恢复期地表径流
IF 0.5 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2021-05-28 DOI: 10.1590/1806-908820210000005
A. G. Spletozer, L. J. Silveira, A. S. Lorenzon, A. Y. Sato, H. Dias
ABSTRACT The objective of this study was to monitor and compare runoff at 2.5 and 3.5 years of rehabilitation of a mined bauxite area with clonal planting of Eucalyptus. Seven plots were allocated for collecting runoff and precipitation was recorded with a pluviograph. The physical and environmental factors which interfere with runoff were characterized in both periods and subjected to principal component analysis (PCA) to show the most explanatory factors. The average monthly runoff percentage at 2.5 years was 0.25% (± 0.26%) of precipitation and equal (p-value<0.05) to the 3.5 years (0.15 ± 0.22%) of rehabilitation. Both values were lower than the Eucalyptus plantation area without mining (0.56%) in the same region and declivity. The high vegetation cover percentage by Eucalyptus crowns and Brachiaria sp. and the high infiltration rates were the determining factors in PCA, and may explain the statistically equal runoff values between the rehabilitation periods. The combination of good edaphic conditions and the fast coverage of the plants resulted in runoff below 1% in a rehabilitated area after bauxite mining.
摘要:本研究的目的是监测和比较一个铝土矿开采区与桉树无性系种植在2.5年和3.5年的恢复径流。分配了7个地块用于收集径流,并用雨量记录仪记录降水。对两个时期影响径流的物理因子和环境因子进行了特征分析,并进行了主成分分析(PCA),以显示最具解释性的因子。2.5年的月平均径流量为降水量的0.25%(±0.26%),与3.5年的恢复期(0.15±0.22%)相当(p值<0.05)。在相同的区域和坡度下,这两个值均低于未采伐桉树人工林面积(0.56%)。桉树冠和梭尾草的高植被覆盖度和高入渗率是主成分分析的决定因子,可以解释恢复期径流值的统计相等。良好的土壤条件和植物的快速覆盖使得铝土矿开采后恢复地区的径流量低于1%。
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引用次数: 0
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