《植物生理学报》 2012, 48(5): 465-471
通信作者：黄国宾；E-mail: firstname.lastname@example.org；Tel: 0871-5941370
摘 要：对漂浮育苗的烟草幼苗进行控水-半萎焉-复水-恢复的循环干旱锻炼。结果表明, 这种干旱锻炼能显著提高烟草幼苗 根、茎、叶中的渗透调节物质可溶性糖和脯氨酸的含量, 降低细胞渗透势。当干旱锻炼过的烟草植株遭受后续的干旱胁 迫时, 与未锻炼的对照相比, 其根、茎、叶能积累更多的可溶性糖和脯氨酸, 从而降低了细胞渗透势, 使叶片能维持较高的 膨压。这些结果表明渗透调节参与了循环干旱锻炼提高的烟草植株抗旱性的形成过程。此外, 干旱锻炼提高了烟草幼苗 的根/冠比。循环干旱锻炼过程中烟草植株一方面使其各部位通过渗透调节来对干旱环境进行生理适应, 另一方面通过调 节光合产物在地上部和地下部的分配以影响根/冠比来对干旱环境进行形态适应, 以最终提高其抗旱性。
关键词：烟草; 循环干旱锻炼; 渗透调节; 干旱胁迫; 抗旱性
Corresponding author: HUANG Guo-Bin; E-mail: email@example.com; Tel: 0871-5941370
Abstract:Circular drought-hardening was applied on tobacco seedlings raised on floating trays by the circle of water control-half wilting-rehydration-recovery. The results showed that the circular drought-hardening can significantly increased content of the osmotic adjustment substances soluble sugar and proline in leaves, stems and roots of tobacco plants, and decreased osmotic potential in leaves. When the drought-hardened seedlings were subjected to subsequent drought stress, as compared with control without the drought hardening, they could accumulate more soluble sugar and proline in leaves, stems and roots, and maintain higer pressure potential through decreasing osmotic potential in leaves. All these results indicated that osmotic regulation participates in the drought hardening-induced enhancement of drought resistance in tobacco plants. In addition, the circular drought-hardening increased root/shoot ratio of tobacco seedlings. The results suggested that the drought hardening, on the one hand, led to physiological adaptation of tobacco plants to drought through osmotic regulation, on the other hand, to morphological adaption to drought through regulating partition of photosynthates between over- and under-ground part, and enhanced the drought resistance of tobacco plants.
Key words: tobacco; circular drought-hardening; osmotic regulation; drought stress; drought resistance
此摘要已有 2190 人浏览