Acer velutinum Bioss. (velvet maple) seedlings are more tolerant to water deficit than Alnus subcordata C.A. Mey. (Caucasian alder) seedlings

IF 1.1 4区 生物学 Q3 PLANT SCIENCES Acta Botanica Croatica Pub Date : 2022-10-31 DOI:10.37427/botcro-2022-029
M. Ravanbakhsh, B. Babakhani, M. Ghasemnezhad, F. Serpooshan, Mohamad Hassan Biglouie
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Abstract

Drought stress is a major environmental factor limiting plant growth. Selection of drought-tolerant plants is of critical importance in vegetation restoration and forestation programs. Alnus subcordata and Acer velutinum are two valuable, dominant, and endemic species in the Hyrcanian forests. There are fast-growing species and significant diffuse-porous hardwood in afforestation and reforestation. One-year old seedlings of both species were exposed to four water shortage treatments (100, 75, 50 and 25% of field capacity (FC) chosen as control, mild, moderate, and severe) for 12 weeks. Thereafter, their morphological characteristics such as height and basal area, total and organs biomass (root, stem, and leaf), leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), as well as physiological and biochemical characteristics such as relative water content (RWC), content of chlorophyll, free proline and malondialdehyde (MDA), and superoxide dismutase (SOD) and peroxidase (POD) activity were measured. The results showed that when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species. The root to shoot ratio (R/S) and root mass ratio (RMR) increased at 50 and 25% FC treatments in A. subcordata, whereas no significant difference was found in A. velutinum under drought treatments. SLA increased significantly at 50% FC in A. velutinum and decreased in A. subcordata under drought treatments compared to control treatment. A. velutinum showed more proline content, RWC, POD, and lower increase in MDA content than A. subcordata under moderate treatment. Therefore, A. velutinum appears to possess a better mechanism to cope drought stress. The drought tolerance of A. velutinum may enhance its potential for climatic adaptations under drier conditions with the ongoing climatic change.
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紫槭。(丝绒枫)幼苗比Alnus subcordata C.A. Mey更耐水分亏缺。(高加索桤木)幼苗
干旱胁迫是制约植物生长的主要环境因子。耐旱植物的选择对植被恢复和造林至关重要。Alnus subcordata和Acer velutinum是海卡尼亚森林中两个有价值的、优势的、特有的树种。在造林和再造林中有速生树种和大量弥散多孔阔叶林。将两种树种的1年树苗分别置于100、75、50和25%田间容量(FC)的4种缺水处理(对照、轻度、中度和重度)下12周。随后,测定其形态特征,如株高和基面积、总生物量和各器官生物量(根、茎、叶)、叶面积(LA)、比叶面积(SLA)、叶面积比(LAR),以及相对含水量(RWC)、叶绿素、游离脯氨酸和丙二醛(MDA)含量、超氧化物歧化酶(SOD)和过氧化物酶(POD)活性等生理生化特征。结果表明:当水分有效度降低时,两种植物的株高、基径、总生物量和各器官生物量、LA、LAR、RWC和叶绿素含量均降低,脯氨酸浓度、MDA含量、SOD和POD活性均升高;50%和25% FC处理下,山茱萸的根冠比(R/S)和根质量比(RMR)均有所提高,而干旱处理下,山茱萸的根冠比和根质量比无显著差异。与对照处理相比,干旱处理在50% FC下显著增加了白绒蒿的SLA,降低了亚绒蒿的SLA。在适度处理下,黄花蒿脯氨酸含量、RWC、POD含量高于亚果仁蒿,MDA含量增幅低于亚果仁蒿。因此,黄杨似乎具有更好的应对干旱胁迫的机制。随着气候的不断变化,黄杨的耐旱性可能会增强其在干旱条件下的气候适应潜力。
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来源期刊
Acta Botanica Croatica
Acta Botanica Croatica PLANT SCIENCES-
CiteScore
2.50
自引率
0.00%
发文量
34
审稿时长
>12 weeks
期刊介绍: The interest of the journal is field (terrestrial and aquatic) and experimental botany (including microorganisms, plant viruses, bacteria, unicellular algae), from subcellular level to ecosystems. The attention of the Journal is aimed to the research of karstic areas of the southern Europe, karstic waters and the Adriatic Sea (Mediterranean).
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