Introduction

Drought is one of the major abiotic stresses that drastically reduces crop yield throughout the world. Being precursor of glutathione biosynthesis and involvement in other metabolic processes, cysteine (Cys) has been shown to alter growth and development in plants. In this context, we investigated Cys-induced physicochemical alterations in oat (Avena sativa L. var. Scott and var. F-411) plants under drought stress.

Methods

There were two levels of drought stress, i.e., control (100% field capacity) and drought (50% field capacity) and three levels of foliar application of Cys, i.e., 0, 10, and 20 mM. Experimental design was completely randomized block design.

Results

Drought stress significantly decreased growth parameters, chlorophyll (Chi) contents, while increased leaf membrane permeability (MP), ascorbic acid (AsA), and activity of catalase (CAT) and peroxidase (POD) enzymes. Foliar application of varying Cys levels significantly increased root fresh weight, root length, photo synthetic pigments (chl. a and b), AsA contents in var. Scott, and shoot length, total free amino acids, total phenolics and free proline contents in var. F-411.

Discussion

Of the two oat varieties, var. Scott proved better in root fresh weight, root length, chl. a and b contents, and total phenolic contents, while var. F-411 was higher in the values of shoot length, MP (%), total free amino acids, and free proline contents. Thus, on the basis of strong root system, total phenolics, and more photosynthetic contents (chl. a and b contents), var. Scott could be grown under semi-arid environments than that of var. F-411.

中文翻译：

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干旱胁迫下半胱氨酸诱导燕麦理化参数的变化（Avena sativa L. var. Scott and F-411）

介绍

干旱是主要的非生物胁迫之一，它极大地降低了世界各地的作物产量。作为谷胱甘肽生物合成的前体并参与其他代谢过程，半胱氨酸 (Cys) 已被证明可以改变植物的生长和发育。在这种情况下，我们研究了干旱胁迫下燕麦（Avena sativa L. var. Scott 和 var. F-411）植物中Cys 诱导的物理化学变化。

方法

有两个干旱胁迫水平，即控制（100% 田间持水量）和干旱（50% 田间持水量）和三个水平的叶面施用 Cys，即 0、10 和 20 mM。实验设计为完全随机区组设计。

结果

干旱胁迫显着降低了生长参数、叶绿素 (Chi) 含量，同时增加了叶膜通透性 (MP)、抗坏血酸 (AsA) 以及过氧化氢酶 (CAT) 和过氧化物酶 (POD) 酶的活性。不同的Cys水平的叶面施用显著增加的根鲜重，根长，照片合成的颜料（叶绿素。一个和b）中，ASA含量变种。Scott 和茎长、总游离氨基酸、总酚类物质和变种中的游离脯氨酸含量。F-411。

讨论

在两种燕麦品种中，var。Scott 在根鲜重、根长、叶绿素方面的表现更好。a和b含量，以及总酚含量，而 var。F-411 的枝条长度、MP (%)、总游离氨基酸和游离脯氨酸含量较高。因此，在强大的根系、总酚类物质和更多的光合含量（chl. a和b含量）的基础上，var。斯科特可以在比 var 的半干旱环境下生长。F-411。