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首页> 外文期刊>Acta Physiologiae Plantarum >Brassinosteroids induce tolerance to water deficit in soybean seedlings: contributions linked to root anatomy and antioxidant enzymes
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Brassinosteroids induce tolerance to water deficit in soybean seedlings: contributions linked to root anatomy and antioxidant enzymes

机译：芸苔类固醇诱导大豆幼苗中的水赤字的耐受性：与根部解剖和抗氧化酶相关的贡献

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Water deficit is a type of abiotic stress that often limits seed germination, causing oxidative stress, cellular damage and physiological quality reduction. However, brassinosteroids regulate several biochemical and physiological processes in plants, reducing the oxidative stress caused by abiotic stresses, such as water deficit. The present study aimed to evaluate the contributions of 24-epibrassinolide (EBR) on the root anatomy and antioxidant enzymes as well as the possible interference of EBR on the oxidative stress, germination and biomass of soybean seedlings subjected to water deficit. The experiment had a factorial design, with the factors completely randomized, and two osmotic potentials (0.0 and -0.3MPa, as the control and water deficit, respectively) and three levels of brassinosteroids (0, 50 and 100nM EBR). Soybean seedlings subjected to water deficit presented reductions of the root epidermis (RET), root endodermis (RDT), root cortex (RCT), vascular cylinder (VCD) and root metaxylem (RMD); however, the application of 100nM brassinosteroids promoted increases in these values of 21, 12, 15, 38 and 15%, respectively, compared with water deficit +0nM brassinosteroids. In relation to antioxidant enzymes, the treatment with 100nM brassinosteroids induced an increase in all of the enzymes evaluated. This study revealed that brassinosteroids promoted an increase in the germination, length and dry matter of soybean seedlings, and these results were explained by the increments in the root anatomy, particularly of the RET, RDT, RCT, VCD and RMD. Reductions in the concentrations of reactive oxygen species (superoxide and hydrogen peroxide) and membrane damage (malondialdehyde and electrolyte leakage) were intrinsically related to the higher activities of antioxidant enzymes (superoxide dismutase, catalase, ascorbate peroxidase and peroxidase), confirming the benefits of brassinosteroids on the antioxidant system. Moreover, 100nM brassinosteroids resulted in a better dose-response in soybean seedlings exposed to water deficit.
机译：水赤字是一种非生物应激，通常限制种子萌发，导致氧化应激，细胞损伤和生理质量降低。然而，芸苔类固醇调节植物中的几种生物化学和生理过程，降低了非生物胁迫引起的氧化应激，例如水缺损。本研究旨在评估24-呕血素醇（EBR）对根部解剖学和抗氧化酶的贡献以及EBR对氧化应激，萌发和对水缺乏的豆类幼苗发芽和生物量的干扰。该实验具有阶乘设计，具有完全随机化的因素，以及两个渗透电位（0.0和-0.3MPa，作为对照和水赤字，分别为3级芸苔类固醇（0,50和100nm EBR）。大豆幼苗经过水缺损呈现的根表皮（RET），根内胚（RDT），根皮层（RCT），血管缸（VCD）和根定位（RMD）;然而，与水缺陷+ 0nM芸苔类固醇相比，100nm铜雌激素促进的100nm芸苔类固醇的施用促进在这些值21,12,15,38和15％的增加。关于抗氧化酶，用100nm芸苔类固醇的处理诱导评估所有酶的增加。该研究表明，芸苔类固醇促进了大豆幼苗的发芽，长度和干物质的增加，并通过根解剖学的增量，特别是RET，RDT，RCT，VCD和RMD来解释这些结果。反应性氧物质浓度（超氧化物和过氧化氢）和膜损伤（丙二醛和电解质泄漏）的减少与抗氧化酶（超氧化物歧化酶，过氧化氢酶，抗坏血酸过氧化物酶和过氧化物酶）的高活性有关，证实了芸苔类固醇的益处在抗氧化系统上。此外，100nm芸苔类固醇导致暴露于水赤字的大豆幼苗中的更好剂量 - 反应。

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