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Morpho-physiological, biochemical, and leaf epidermal responses of Desmostachya bipinnata L. in arid habitats
Arid Land Research and Management ( IF 1.4 ) Pub Date : 2022-04-04 , DOI: 10.1080/15324982.2022.2052202
Safura Bibi 1 , Muhammad Sajid Aqeel Ahmad 1 , Mansoor Hameed 1 , Farooq Ahmad 1 , Ambreen Khadija Alvi 2 , Ali Kamal 1
Affiliation  

Abstract

The response of morpho-physiological and leaf surface attributes along with antioxidant potential of Desmostachya bipinnata L. populations collected from arid regions with 1.7–3.7 soil moisture % and =22.8–49.6 dS m−1 ECe was evaluated for adaptability to aridity. Among soil attributes, soil pH, ECe, moisture content, saturation percentage, organic matter, P, Na+, K+, Ca2+, Mg2+, Cl, NH4-N, NO3-N and plant attributes related to the morphology, physiology, antioxidant potential were studied. With increasing aridity root:shoot length ratio (0.1–0.4 cm) increased while average leaf area (12–4 cm2), shoot biomass (5–0.5 g), and root biomass (0.8–0.1g) decreased significantly. Parallel to that chlorophyll a (1–0.1 mgg−1 fresh weight) degradation was observed along with reduced carotenoid content (0.25–0.05 mgg−1 fresh weight). All other organic osmolytes decreased except for total soluble sugars which increased (0.10–0.15 μmol g−1 fresh weight) as the dryness ratio increased and more activities of the antioxidant enzymes APX (0.5–3.5 units mg pro−1), CAT (0.1–0.8 units mg pro−1), POD (0.02–0.25 units μg pro−1), and SOD (2–7 units mg pro−1) were observed. Among soluble cations, Na+ concentration increased (14–24 mg g−1 dw) in shoot as the aridity increased while shoot K+ (35–15 mgg−1 dw) and Mg2+ concentration decreased in both root and shoot tissues. Ca2+ concentration increased in root while N and P content decreased. In conclusion, aridity reduced overall vegetative growth but enhanced root growth for better absorption of water from the deeper layers with concurrent silica deposition in epidermal layers for controlling water loss.



中文翻译:

Desmostachya bipinnata L. 在干旱生境中的形态生理学、生化和叶表皮反应

摘要

评估了从土壤湿度 1.7-3.7 % 和 =22.8-49.6 dS m -1 EC e的干旱地区收集的Desmostachya bipinnata L. 种群的形态生理和叶表面属性以及抗氧化潜力的响应,以评估其对干旱的适应性。土壤属性中,土壤pH、EC e、含水量、饱和度、有机质、P、Na +、K +、Ca 2+、Mg 2+、Cl、NH 4 -N、NO 3研究了与形态、生理、抗氧化潜力相关的-N和植物属性。随着干旱的增加,根茎比(0.1-0.4 cm)增加,而平均叶面积(12-4 cm 2)、茎生物量(5-0.5 g)和根生物量(0.8-0.1g)显着下降。与叶绿素a(1-0.1 mgg -1鲜重)平行,观察到类胡萝卜素含量降低(0.25-0.05 mgg -1鲜重)。除了总可溶性糖随干度增加和抗氧化酶 APX(0.5-3.5 单位 mg pro -1 、CAT(0.1 –0.8 单位毫克亲-1 )、POD (0.02–0.25 单位 μg pro -1 ) 和 SOD (2-7 单位 mg pro -1 )。在可溶性阳离子中,随着干旱的增加,地上部的 Na +浓度增加(14-24 mg g -1 dw),而根部和地上部组织中的 K +(35-15 mgg -1 dw)和 Mg 2+浓度降低。根中Ca 2+浓度升高,N、P含量降低。总之,干旱减少了整体的植物生长,但促进了根系生长,从而更好地吸收深层水分,同时在表皮层沉积二氧化硅以控制水分流失。

更新日期:2022-04-04
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