摘要
采用分根半根固定胁迫和半根交替胁迫的方法,研究了轻度(10%PEG)、中度(20%PEG)和重度(30%PEG)水分胁迫对平邑甜茶(Malushupehensis)水培苗根系活力、根水势和叶片相对含水量的影响,结果表明:分根半根固定胁迫能有效地维持叶片含水量,增加未受胁迫半根的根干重、根表面积、根系活力和根水势,其保水效果优于分根半根交替胁迫处理。分根半根固定胁迫受水分胁迫的一半根(固干)的所有参数在整个胁迫过程中均显著高于全根受胁迫的根系;同时分根半根固定胁迫的叶片含水量和水势又高于交替分根胁迫的叶片含水量和水势,说明半根胁迫能在一定程度上发挥根系的高效吸水作用,提高叶水势,有利于植株保持良好的水分状况。
The fixed roots-divided and alternative roots-divided water stress were used to compare the effects of different water stress on root vitality, root water potential, and leave relative water content of Malus hupehensis in the experiment. The result showed that the fixed root-divided water stress had positive influence on the leave relative water content, root dry weight, root surface, root vitality and root water potential on the half-root unstressed. The water-containing capacity of the fixed roots-divided water stress was better than that of the alternative root-divided water stress. All of the parameters of the unstressed half-root on the fixed roots-divided were remarkably higher than the two half-roots both water stressed. And the fixed root-divided water stress was keeping higher leave relative water content and root potential than the alternative root-divided water stress, therefore this suggested that half-root water stress may play a positive role in making full use of water on root and the experiment showed that the fLxed rootdivide water stress had more significance than the alternative on utilization of water on root under stress.
出处
《中国农学通报》
CSCD
2006年第8期355-359,共5页
Chinese Agricultural Science Bulletin
基金
北京市自然科学基金资助项目"果树逆境生理及分子生物学"(6041002)。
关键词
苹果
分根
水分胁迫
根活力
水势
Apple
Half-root
Water stress
Root vitality
Water potential
