Ecological Genetics and Genomics最新文献

Differential response of rice (Oryza sativa L.) genotypes to cold tolerance in western Ethiopia's mid-altitude environments 埃塞俄比亚西部中海拔环境下水稻基因型对耐寒性的差异响应

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.egg.2026.100442

Pichiah Gomathinayagam , Usman Mohammed Ali , B.C. Nandeshwar , Samuel Lema , Mehdi Rahimi

Cold stress poses a significant and growing threat to rice production in mid-altitude regions, exacerbated by climate variability. This study assessed the seedling-stage cold tolerance of 35 diverse rice genotypes under natural field conditions in western Ethiopia's mid-altitude zone during the 2019 Meher season. Employing a Randomized Complete Block Design with three replications, seedlings were exposed to natural cold stress, with average nocturnal temperatures of 13 °C and diurnal temperatures averaging 26 °C. Seedling establishment and visual injury, scored using the IRRI Standard Evaluation System (SES), were evaluated at 15 and 30 days after sowing. Analysis of Variance confirmed highly significant (P < 0.01) genotypic differences, and mean separation using Tukey's HSD post-hoc test delineated distinct tolerance groups. Eight genotypes; NERICA 4, Hiber, Abay, Chewaqa, Gambella, Akkavach, Irib, and CO-51 demonstrated remarkable resilience, achieving the highest SES score of 1 (very tolerant) with dark green foliage. Among these, four genotypes (NERICA 4, Hiber, Abay, and Chewaqa) exhibited superior seedling establishment (>73 % survival at 30 DAS) with minimal mortality (3.3–6.9 %) and elevated germination rates (66.6–82.3 %). In contrast, MTU 7029 and RGL 2537 were highly susceptible, suffering 100 % seedling mortality. The strong concordance between quantitative survival data and qualitative SES scores validates the robustness of the screening. The identified cold-tolerant genotypes, particularly the top-performing four, represent valuable genetic resources for direct cultivation or as parental lines in breeding programs aimed at enhancing climate resilience in rice. These findings underscore the importance of local adaptation screening and provide a foundation for developing cold-resilient varieties.

寒冷胁迫对中海拔地区的水稻生产构成了日益严重的威胁，并因气候变化而加剧。本研究评估了埃塞俄比亚西部中高海拔地区35种不同水稻基因型在2019年Meher季节自然大田条件下的苗期耐寒性。采用3个重复的随机完全区组设计，幼苗暴露在自然冷胁迫下，夜间平均温度为13 °C，白天平均温度为26 °C。采用国际水稻研究所（IRRI）标准评价系统（SES）评分，分别在播种后15天和30天对幼苗成活率和视觉损伤进行评分。方差分析证实了高度显著的基因型差异（P <； 0.01），使用Tukey's HSD事后检验的平均分离描述了不同的耐受性组。八个基因型;NERICA 4、Hiber、Abay、Chewaqa、Gambella、Akkavach、Irib和CO-51表现出显著的抗逆性，叶片深绿色，SES得分最高，为1（非常耐）。其中，4个基因型（NERICA 4、Hiber、Abay和Chewaqa）在30 DAS条件下表现出较好的幼苗成活率（>73 %），最低死亡率（3.3-6.9 %）和较高的发芽率（66.6-82.3 %）。而MTU 7029和RGL 2537极易感染，幼苗死亡率高达100% %。定量生存数据和定性SES评分之间的强烈一致性验证了筛选的稳健性。已确定的耐冷基因型，特别是表现最好的4个基因型，代表了直接栽培或在旨在提高水稻气候适应能力的育种计划中作为亲本系的宝贵遗传资源。这些发现强调了本地适应性筛选的重要性，并为开发抗寒品种提供了基础。

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引用次数: 0

Unraveling the phylogeny of seagrass species in Seriwe Bay, Lombok, Indonesia: Evidence from rbcL gene 解开印尼龙目岛塞里湾海草物种的系统发育：来自rbcL基因的证据

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-22 DOI: 10.1016/j.egg.2026.100450

Rizal M. Suhardi , Ratna Susandarini , Hilmi Hidayati , Wira Rahardi , Agung Hidayat

Seagrasses are essential marine plants that provide essential services, including nutrient cycling, food, carbon sequestration, and habitats for many organisms. However, they are increasingly threatened by habitat degradation and anthropogenic activity. Unfortunately, data on seagrass diversity and phylogenetics in Seriwe Bay, Lombok Island, is limited. This study aims to assess seagrass diversity and examine evolutionary links through rbcL gene sequences. Seven species of seagrass were identified: Enhalus acoroides, Halophila ovalis, Syringodium isoetifolium, Halodule pinifolia, Halophila spinulosa, Cymodocea rotundata, and Cymodocea serrulata. Phylogenetic analysis identified six clades associated with two families: Hydrocharitaceae (E. acoroides, H. ovalis) and Cymodoceaceae (C. serrulata, C. rotundata, S. isoetifolium, H. pinifolia), with bootstrap values more than 90 % whereas Halophila spinulosa cannot be detected by rbcL. These findings expand our understanding of seagrass biodiversity and are crucial for developing more effective conservation strategies in the region.

海草是重要的海洋植物，提供重要的服务，包括养分循环、食物、碳封存和许多生物的栖息地。然而，它们正日益受到生境退化和人为活动的威胁。不幸的是，关于龙目岛塞里韦湾海草多样性和系统发育的数据有限。本研究旨在通过rbcL基因序列评估海草的多样性并研究其进化联系。共鉴定出7种海草：acoroides、Halophila ovalis、Syringodium isoetifolium、Halodule pinifolia、Halophila spinulosa、Cymodocea rotundata、Cymodocea serrulata。系统发育分析鉴定出水螅科（E. acoroides， H. ovalis）和Cymodoceaceae （C. serrulata， C. rotundata， S. isoetifolium， H. pinifolia）两个科的6个分支，bootstrap值均大于90 %，而盐芽菌（Halophila spinulosa）无法用rbcL检测到。这些发现扩大了我们对海草生物多样性的理解，对于在该地区制定更有效的保护策略至关重要。

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引用次数: 0

Whole-genome analysis of proteases and multidomain lignocellulolytic enzymes in halophilic Cellulosimicrobium sp. LC18 from Malaysian mangrove sediment 马来西亚红树林沉积物中嗜盐菌LC18中蛋白酶和多结构域木质纤维素水解酶的全基因组分析

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-02-25 DOI: 10.1016/j.egg.2026.100456

Shanise Pui Kei Thean , Ivan Kai Jie Lim , Phoebe Zhi Yee Looi , Tau Chuan Ling , Kah Yaw Ee , Ming Quan Lam

Halophilic bacteria from mangrove sediments are valuable for enzymatic diversity in biotechnology. Cellulosimicrobium is a bacterial genus previously classified as Oerskovia, mainly known for cellulose degradability; little is known about its proteolytic ability. In this study, we present the whole genome sequence of Cellulosimicrobium sp. LC18, a strain isolated from mangrove soil collected at Matang Mangrove Forest Reserve Eco Park, Kuala Sepetang, Perak, Malaysia. The genome of Cellulosimicrobium sp. LC18 is 5 Mbp in size, with a G + C content of 73.68% and contains a total of 4371 protein-coding genes. Based on genomics approach, the results indicated that the genome of Cellulosimicrobium sp. LC18 encodes at least 17 genes for distinct multidomain carbohydrate-active enzymes. Among these, four glycoside hydrolases with carbohydrate binding modules (GH-CBM) are associated with cellulose degradation, 11 GH-CBM associated with hemicellulose degradation, with one having carbohydrate esterase (CE) in its GH-CBM multidomain, and one multidomain of auxiliary activity (AA) or lytic polysaccharide monooxygenase (LMPO-CBM). In addition, of the genome harbours 11 protein-degrading genes (serine and metalloproteases), ten of which contain signal peptides, this salt-tolerant strain LC18 also exhibits protease activity in vitro. This study reveals protein and carbohydrate degradation potential, highlighting its prospects for enzyme discovery.

红树林沉积物中的嗜盐细菌对生物技术中酶的多样性具有重要价值。纤维素微生物是一种细菌属，以前被归类为Oerskovia，主要以纤维素降解性而闻名；人们对它的蛋白水解能力知之甚少。在这项研究中，我们报告了从马来西亚Perak州Kuala Sepetang红树林保护区生态公园的红树林土壤中分离到的一株Cellulosimicrobium sp. LC18的全基因组序列。Cellulosimicrobium sp. LC18的基因组大小为5 Mbp， G + C含量为73.68%，共包含4371个蛋白质编码基因。基于基因组学方法，结果表明，Cellulosimicrobium sp. LC18的基因组至少编码17个不同的多结构域碳水化合物活性酶基因。其中，4种糖苷水解酶具有碳水化合物结合模块（GH-CBM）与纤维素降解有关，11种 GH-CBM与半纤维素降解有关，其中1种在其GH-CBM多结构域具有碳水化合物酯酶（CE）， 1种多结构域具有辅助活性（AA）或水解多糖单加氧酶（LMPO-CBM）。此外，该耐盐菌株LC18在体外也表现出蛋白酶活性，其基因组中含有11个蛋白质降解基因（丝氨酸和金属蛋白酶），其中10个含有信号肽。这项研究揭示了蛋白质和碳水化合物的降解潜力，突出了它在酶发现方面的前景。

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引用次数: 0

Unveiling the microbial secrets of hydroponically cultivated Humulus lupulus 揭示水培栽培葎草的微生物秘密

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-11 DOI: 10.1016/j.egg.2026.100446

Tripti Singh , Ashwani Mathur

引用次数: 0

Microbial signatures of maize soils: Shifts in bacterial community across bulk and spermosphere niches 玉米土壤的微生物特征：细菌群落在整体和精子圈生态位上的变化

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-13 DOI: 10.1016/j.egg.2026.100447

Arulanandar Abishagu , Ariyan Manikandan , Pandian Kannan , Narayanan Manikanda Boopathi , A.R.U. Pragadeesh , Murugaiyan Senthilkumar

The spermosphere is a significant constituent of the plant micro-ecosystem, with a distinct role in seed microbial ecology, although it is relatively unexplored. Understanding maize spermosphere microbes is essential for optimizing agricultural practices and enhancing crop productivity. A field study was conducted to investigate the diversity of bacterial communities inhabiting bulk soils and spermosphere soils associated with maize crop using 16S rRNA V3–V4 amplicon sequencing. Overall, 1391 OTUs were identified and classified into 32 phyla, 77 classes, 167 orders, 337 families, 752 genera. Spermosphere shared phylum level features with the bulk soil, such as predominance of Proteobacteria, Firmicutes, Actinobacteria, Planctomycetes, Bacteroidetes, Chloroflexi, Cyanobacteria, Acidobacteria and Nitrospirae. At the genus level, Desulfallas, Chryseolinea, Stenotrophomonas and Niveispirillum shows significantly higher abundances in spermosphere, while Synechococcus, Corynebacterium, and unclassified Clostridiales exhibit notable decreases. Functional prediction revealed 334 KEGG pathways and 6759 orthologs. Spermosphere soils showed higher organic carbon, microbial biomass and respiration than bulk soils, confirming their role as microbial hotspots and potential bioinoculant niches. Ammonia oxidation genes dominated in the spermosphere, whereas nitrate reduction and assimilation genes prevailed in bulk soil. The spermosphere exhibited greater microbial diversity and distinct taxonomic profiles, indicating differences from bulk soil. This preliminary study shows that germinating maize seed had developed a unique microbiome which indicates the importance of considering the spermosphere for developing new bioinoculants based on microbiome studies for sustainable agricultural practices.

精子层是植物微生态系统的重要组成部分，在种子微生物生态中发挥着独特的作用，尽管其研究相对较少。了解玉米精子圈微生物对优化农业实践和提高作物生产力至关重要。采用16S rRNA V3-V4扩增子测序技术，对玉米相关土壤和土壤中细菌群落的多样性进行了研究。共鉴定出1391只otu，隶属于32门77纲167目337科752属。精子圈与土壤具有相同的门水平特征，如变形菌门、厚壁菌门、放线菌门、plantomycetes、拟杆菌门、绿杆菌门、蓝藻门、酸杆菌门、硝化杆菌门等。在属水平上，Desulfallas、Chryseolinea、Stenotrophomonas和Niveispirillum在精子中的丰度显著增加，而Synechococcus、棒状杆菌和未分类的Clostridiales在精子中的丰度显著减少。功能预测显示了334条KEGG通路和6759个同源物。土壤的有机碳含量、微生物生物量和呼吸量均高于普通土壤，证实了其作为微生物热点和潜在的生物接种生态位的作用。土壤中氨氧化基因占主导地位，而硝态氮还原和同化基因占主导地位。土壤中微生物多样性和分类特征明显，与散装土壤存在差异。这项初步研究表明，萌发中的玉米种子已经形成了一个独特的微生物组，这表明在微生物组研究的基础上开发新的生物接种剂对可持续农业实践具有重要意义。

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引用次数: 0

A 16s rRNA amplicon-based study on the microbial taxonomic and functional diversity of eutrophic urban lakes in Dhaka, Bangladesh 基于16s rRNA扩增子的达卡富营养化城市湖泊微生物分类和功能多样性研究

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-02-11 DOI: 10.1016/j.egg.2026.100455

Khalid Shahriar, Md Wahid Murad, Lamim Muntasir, Md Anwar Hossain Adib, Md Miraj Kobad Chowdhury

Natural bioremediation mechanisms and strategies of lakes largely depend on its bacterial community. Abundance of core bacterial taxa collectively determines the dominant bioremediation and metabolic adaptation strategies. Understanding the microbial diversity in urban lakes could contribute significantly in lake health management. 16s rRNA amplicon sequencing can capture the taxonomic and functional abundance which can generalize the functional trends in the given system and implement in bioremediation. This study implemented metagenomic approach to unveil the taxonomic diversity and functional potential of two eutrophic urban lakes (Ramna and Gulshan Lake) of Dhaka, Bangladesh. Our findings suggest that, sediment of Ramna lake (OTUs = 4864; Shannon Index = 7.369) was more diverse and enriched with taxa than water of Ramna (OTUs = 1520; Shannon Index = 4.572) and Gulshan Lake (OTUs = 1671; Shannon Index = 4.987). Proteobacteria and actinobacteria dominated the water of both Ramna (Proteobacteria = 31.01% and Actinobacteria = 50.94%) and Gulshan Lake (47.73% and 11.8%), while Acidobacteria was the key phylum in sediment of Ramna Lake (23.25%). Interestingly, water and sediment of the lakes shared extensive similarity in terms of functions, where transporters, amino acid, carbohydrate and xenobiotic metabolism were prominent. However, the comparatively less eutrophic lake was more abundant with transporters and metabolism and less abundant with bacterial motility and secretory function. Overall, we report a significant functional homogeneity and taxonomic heterogeneity in the trophic levels of the studied lakes. Given the predicted abundance of mercury-resistance function in KEGG annotation, we isolated and identified a Bacillus or Cytobacillus species bacteria that can withstand approximately 150 ppm mercury, which can have implication in metal bioremediation.

湖泊的自然生物修复机制和策略在很大程度上取决于其细菌群落。核心细菌类群的丰度共同决定了优势的生物修复和代谢适应策略。了解城市湖泊微生物多样性对湖泊健康管理具有重要意义。16s rRNA扩增子测序可以捕获系统的分类丰度和功能丰度，可以概括系统的功能趋势，实现生物修复。本研究采用宏基因组学方法揭示了孟加拉国达卡两个富营养化城市湖泊（Ramna湖和Gulshan湖）的分类多样性和功能潜力。我们的研究结果表明,沉积物Ramna湖(辣子鸡 = 4864;香农指数 = 7.369)比水更多元化和富含类群Ramna(辣子鸡 = 1520;香农指数 = 4.572)和Gulshan湖(辣子鸡 = 1671;香农指数 = 4.987)。变形菌门（ = 31.01%）和放线菌门（ = 50.94%）和古尔山湖的水体以变形菌门和放线菌门为主（47.73%和11.8%），而酸杆菌门是拉姆纳湖沉积物的关键门（23.25%）。有趣的是，湖泊的水和沉积物在功能上具有广泛的相似性，其中转运体、氨基酸、碳水化合物和外源代谢都很突出。而富营养化程度相对较低的湖泊转运体和代谢体较多，细菌运动和分泌功能较少。总体而言，我们报告了研究湖泊在营养水平上的显著功能同质性和分类异质性。考虑到KEGG注释中预测的抗汞功能的丰度，我们分离并鉴定了一种芽孢杆菌或细胞芽孢杆菌属细菌，它们可以承受大约150 ppm的汞，这可能对金属生物修复有意义。

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引用次数: 0

Enhancing wheat productivity and increasing the gene expression of TaCAT1 and enzymatic antioxidants under the influence of salicylic acid in desert environments 水杨酸对荒漠环境下小麦产量的影响及对TaCAT1和酶促抗氧化剂基因表达的影响

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-11 DOI: 10.1016/j.egg.2026.100444

Mohammed Ismail Khalaf Al-Fahdawy , Omer Ismail Al-Fahdawi , Amer Hashim Abdulmajeed , Harith Sadaa Madhan AlFahdawy

A field study was implemented in Al-Tharthar, north of Ramadi in Al-Anbar Province, during the 2024–2025 season in a gypsum soil on a farmer's field, to study the impact of salicylic acid on the gene expression of the TaCAT1 gene and the activity of the catalase enzyme and hydrogen peroxide (H₂O₂) accumulation, and the productivity of wheat. The study was implemented using a split-plot system according to the Randomized Complete Block Design. The study showed a pronounced effect of salicylic acid in enhancing TaCAT1 gene expression. The higher concentration of salicylic acid (SA2) doubled the expression values (14.12, 14.02, and 10.43-fold in the three cultivars, respectively). This increase was reflected positively in elevating catalase activity, which helped reduce H₂O₂ accumulation in the plants. Furthermore, salicylic acid improved most yield-related traits. The cultivars varied in their tolerance to desert conditions, with Fatah (G3) outperforming the others in most traits. It recorded averages of spike length (9.17 cm), grains spike⁻¹ (43.00 grains spike⁻¹), grain yield (547.44 kg donum⁻¹), grain protein percentage (8.55 %), and protein yield (48.32 kg donum⁻¹). Other traits were distributed between the Hourani and Sham cultivars. Meanwhile, the SA2 treatment (200 mg L⁻¹) achieved the highest averages across traits: spike length (8.06 cm), grains spike⁻¹ (38.64 spike m⁻²), 500-seed weight (15.22 g), grain yield (500.75 kg donum⁻¹), grain protein percentage (10.61 %), and protein yield (53.46 kg donum⁻¹), Correlation analysis revealed a positive correlation between yield and all traits except for hydrogen peroxide activity, grain density per spike, and 500-grain weight, which showed a negative correlation with grain yield. Pathway analysis demonstrated the direct influence of spike length and number of seeds per spike on yield. As for indirect influences, Caltase enzyme played a significant role in improving most traits, resulting in increased yield.

为了研究水杨酸对小麦TaCAT1基因表达、过氧化氢酶活性和过氧化氢（H2O2）积累以及产量的影响，于2024-2025年在安巴尔省拉马迪北部的Al-Tharthar进行了一项田间研究。本研究采用随机完全区组设计的分割图系统。研究表明，水杨酸对TaCAT1基因表达有明显的增强作用。较高浓度的水杨酸（SA2）使3个品种的表达量分别增加了14.12倍、14.02倍和10.43倍。过氧化氢酶活性的提高有助于降低植物体内H2O2的积累。此外，水杨酸提高了大多数产量相关性状。这些品种对沙漠环境的耐受性各不相同，法塔赫（G3）在大多数性状上优于其他品种。测定了穗长（9.17 cm）、粒穗−1（43.00粒穗−1）、籽粒产量（547.44 kg donum−1）、籽粒蛋白质含量（8.55 %）和蛋白质产量（48.32 kg donum−1）的平均值。其他性状分布在胡拉尼和沙姆品种之间。同时，SA2处理（200 mg L−1）各性状的平均值最高：穗长（8.06 cm）、穗粒数−1（38.64穗粒数m−2）、500粒重（15.22 g）、籽粒产量（500.75 kg donum−1）、籽粒蛋白含量（10.61 %）、籽粒蛋白产量（53.46 kg donum−1）。除过氧化氢活性、穗粒密度、500粒重与籽粒产量呈负相关外，其余性状与产量呈正相关。途径分析表明，穗长和穗粒数对产量有直接影响。间接影响方面，Caltase酶对大部分性状的改善作用显著，提高了产量。

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引用次数: 0

Dimensional and morphological variability of traditional rice cultivars in South India: Implications for food processing and market application 南印度传统水稻品种的尺寸和形态变异：对食品加工和市场应用的影响

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2025-12-24 DOI: 10.1016/j.egg.2025.100436

Jayanthi B, Harshini KK, Bhavadharani T, Sudharsana S

This study evaluates the varietal impact on the engineering and dimensional properties of traditional South Indian rice cultivars. Twenty-two rice varieties were cultivated and evaluated under similar conditions using a random block design experiment. Width, length, and thickness of the rice varieties ranging from 1.90 to 3.14 mm, 5.13–7.85 mm, and 0.94–2.96 mm, respectively. Mean diameter, sphericity (0.33–0.67), aspect ratio (0.24–0.56), and surface area (12.66–36.75 mm²) were calculated. Heatmaps highlighted variability and correlations between dimensional variables, with Pearson correlation indicating positive relationships. Hierarchical clustering classified rice varieties into four groups, and factor analysis revealed two major components, explaining 78.55 % and 19.26 % of the variance, respectively. This research offers valuable insights into the dimensional properties of traditional rice varieties, aiding the design of food processing equipment and enhancing their potential applications in future markets.

本研究评价了品种对南印度传统水稻品种工程性状和尺寸性状的影响。采用随机区组设计试验，在相似条件下栽培22个水稻品种。水稻品种的宽度、长度和厚度分别为1.90 ~ 3.14 mm、5.13 ~ 7.85 mm和0.94 ~ 2.96 mm。计算平均直径、球度（0.33 ~ 0.67）、纵横比（0.24 ~ 0.56）和表面积（12.66 ~ 36.75 mm2）。热图突出了维度变量之间的可变性和相关性，皮尔逊相关性表明了正相关关系。分层聚类将水稻品种分为4类，因子分析揭示了两个主要成分，分别解释了78.55 %和19.26 %的方差。这项研究为了解传统水稻品种的尺寸特性提供了有价值的见解，有助于食品加工设备的设计，并增强其在未来市场上的潜在应用。

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引用次数: 0

Genetic diversity and phylogenetic relationships among four species of Veneridae (Bivalvia) inferred from molecular data 从分子数据推断四种双壳科植物的遗传多样性和系统发育关系

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1016/j.egg.2026.100443

Tahani El Ayari , Najoua Trigui El Menif

The genetic diversity and phylogenetic relationships among four species belonging to the family of Veneridae was investigated using the mitochondrial 16S mtDNA. Bivalves have been collected from two stations, Thau lagoon (France) and Radés (Tunisia), situated in the Western Mediterranean basin. The four venerid species were found to have 26 different haplotypes; no haplotype was found to be shared by all the venerid species. Venerupis philippinarum exhibited the highest haplotype and nucleotide diversity (hd = 0.844 and π = 0.120). The genetic differentiation between the venerids species was proved with the high percentage of variation 53.87 % and high genetic distances. Furthermore, the genetic distances between V. decussata populations were low. The samples collected in the Mediterranean Thau lagoon, France provide morphological evidence of the probable occurrence of hybridization between native V. decussata and introduced V. philippinarum. This result was confirmed using nuclear markers (ITS1, ITS2 and 5S rDNA).

利用线粒体16S mtDNA分析了金星科4个物种的遗传多样性和系统发育关系。从位于西地中海盆地的Thau泻湖（法国）和rad（突尼斯）两个站点收集了双壳类动物。发现4种毒蛇有26种不同的单倍型；没有发现所有毒蛇属物种共有的单倍型。菲律宾Venerupis philippinarum单倍型和核苷酸多样性最高（hd = 0.844,π = 0.120）。菊科植物间存在遗传分化，变异率高达53.87 %，遗传距离高。此外，居群间遗传距离较低。在法国地中海Thau泻湖采集的样本提供了本地V. decussata与引进V. philippinarum杂交可能发生的形态学证据。核标记（ITS1、ITS2和5S rDNA）证实了这一结果。

引用次数: 0

Genetic distinctiveness of Bay of Bengal Lates calcarifer: Mitochondrial markers reveal regional divergence from Indo-Pacific populations 孟加拉湾晚期钙化动物的遗传独特性：线粒体标记揭示了印度-太平洋种群的区域差异

Q3 Agricultural and Biological Sciences

Ecological Genetics and Genomics

Pub Date : 2026-03-01 Epub Date: 2026-01-05 DOI: 10.1016/j.egg.2026.100440

Md. Amdadul Haque , Jonaira Rashid , Md. Rahamat Ullah , Md. Abu Naser , Md. Touhidul Islam , Md. Aktaruzzaman , Al-Amin , Md. Harunor Rashid , Anuradha Bhadra

The Asian seabass (Lates calcarifer) is a valuable and popular food fish in Southeast Asia. This species has become an important aquaculture fish, particularly in the southern part of Bangladesh. A total of 90 nucleotide sequences were used to explore the genetic divergence and phylogeographic structure in Asian seabass using two mitochondrial DNA markers, cytochrome oxidase subunit I (COI) and cytochrome b (Cytb). The results revealed low intra-population genetic distances, and ABGD clustering revealed strong genetic homogeneity between Bangladeshi and Indian populations. However, long-term geographic isolation and limited gene flow were reflected in the deep divergence (8–10 %) observed between the Bay of Bengal and the Indo-Pacific populations (Indonesia, China, and Australia). AMOVA revealed a strong population structure, with high among-group variance and a significant fixation index (FST = 0.8988; P < 0.001). Phylogenetic analyses demonstrated congruent topologies, identifying two major clades corresponding to the Bay of Bengal and the Indo-Pacific lineages. The specimens from Bangladesh formed a distinct and well-supported cluster, closely related to Indian individuals, whereas Indonesian, Chinese, and Australian populations grouped into separate clades. Haplotype network analysis supported these findings, revealing two discrete lineages and region-specific haplotypes shaped by oceanographic barriers and localized adaptation. The presence of unique MOTUs in ABGD and ASAP analyses further emphasizes the extent of mitochondrial divergence. The genetic distinctiveness of Bay of Bengal seabass highlights the need for region-specific conservation and aquaculture strategies, which reflect prioritizing local genetic resources in broodstock programs as essential to maintain genetic diversity.

亚洲海鲈（Lates calcarifer）是东南亚一种珍贵而受欢迎的食用鱼。该物种已成为一种重要的水产养殖鱼类，特别是在孟加拉国南部。利用细胞色素氧化酶亚基I （COI）和细胞色素b （Cytb）两种线粒体DNA标记，对亚洲鲈鱼的遗传差异和系统地理结构进行了分析。结果显示种群内遗传距离较低，ABGD聚类显示孟加拉国和印度种群之间具有很强的遗传同质性。然而，长期的地理隔离和有限的基因流动反映在孟加拉湾和印度-太平洋种群（印度尼西亚、中国和澳大利亚）之间观察到的深度分化（8-10 %）。AMOVA具有较强的种群结构，组间方差大，固定指数显著（FST = 0.8988;P <； 0.001）。系统发育分析证明了一致的拓扑结构，确定了两个主要的分支，对应于孟加拉湾和印度-太平洋谱系。来自孟加拉国的标本形成了一个独特的、支持良好的集群，与印度个体密切相关，而印度尼西亚、中国和澳大利亚的种群则分为不同的分支。单倍型网络分析支持了这些发现，揭示了海洋障碍和局部适应形成的两种离散谱系和区域特异性单倍型。ABGD和ASAP分析中独特的MOTUs的存在进一步强调了线粒体分化的程度。孟加拉湾海鲈的遗传独特性凸显了制定区域保护和水产养殖战略的必要性，这些战略反映了在亲鱼计划中优先考虑当地遗传资源，这对维持遗传多样性至关重要。

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引用次数: 0