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首页> 外文期刊>Frontiers in Plant Science >Differential Responses of Polyamines and Antioxidants to Drought in a Centipedegrass Mutant in Comparison to Its Wild Type Plants
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Differential Responses of Polyamines and Antioxidants to Drought in a Centipedegrass Mutant in Comparison to Its Wild Type Plants

机译：与野生型植物相比，百叶草突变体中多胺和抗氧化剂对干旱的差异响应。

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Centipedegrass ( Eremochloa ophiuroides [Munro] Hack.) is an important warm-season turfgrass species with low turf maintenance requirements. However, our knowledge on physiological adaptation of centipedegrass to drought stress is limited. Physiological responses to drought in a gamma-ray-induced mutant 22-1 as compared with two wild type (WT) lines were analyzed for understanding of drought tolerance mechanism of centipedegrass. The mutant showed an elevated drought tolerance with higher levels of relative water content, net photosynthetic rate ( A ) and stomatal conductance ( g _(s)) and lower levels of ion leakage and malondialdehyde (MDA) under drought stress as compared with WT plants. A showed significant correlation with g _(s)and MDA. Higher levels of antioxidant enzymes activities, non-enzyme antioxidants, and polyamines including putrescine (Put), spermidine (Spd), and spermine (Spm) were maintained in 22-1 than in WT plants. Superoxide dismutase (SOD), catalase (CAT), ascorbate-peroxidase (APX), and glutathione reductase (GR) activities and ascorbic acid (AsA) content were significantly correlated with both Put and Spd levels, and reduced glutathione level was correlated with Put during drought stress. Exogenous application of Put, Spd, and Spm increased drought tolerance and activities of SOD, CAT, APX, and GR in WT plants. The results suggest that higher levels of polyamines and antioxidant defense system are associated with the elevated drought tolerance in 22-1, which may improve protection on photosynthesis against drought induced oxidative damage.
机译：enti草（Eremochloa ophiuroides [Munro] Hack。）是一种重要的暖季型草皮草种，对草皮的维护要求低。但是，我们对cent对干旱胁迫的生理适应性的知识是有限的。分析了γ射线诱导的突变体22-1与两个野生型（WT）品系相比对干旱的生理响应，以了解cent的干旱耐受机制。与野生型植物相比，该突变体表现出更高的抗旱性，相对水分含量，净光合速率（A）和气孔导度（g _（s））较高，并且在干旱胁迫下离子泄漏和丙二醛（MDA）含量较低。 。 A显示与g_（s）和MDA显着相关。与野生型植物相比，在22-1中维持了较高水平的抗氧化酶活性，非酶抗氧化剂和包括腐胺（Put），亚精胺（Spd）和亚精胺（Spm）的多胺。超氧化物歧化酶（SOD），过氧化氢酶（CAT），抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR）活性和抗坏血酸（AsA）含量均与Put和Spd水平显着相关，而降低的谷胱甘肽水平与Put相关在干旱胁迫期间。 Put，Spd和Spm的外源施用提高了野生植物的耐旱性以及SOD，CAT，APX和GR的活性。结果表明，较高水平的多胺和抗氧化剂防御系统与22-1中提高的耐旱性有关，这可能会改善对光合作用的保护，以抵抗干旱引起的氧化损伤。

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