外源油菜素内酯对棉花耐盐性的影响(英文)

[目的]为明确外源油菜素内酯对棉花耐盐性的影响。[方法]对盐胁迫下棉花设置3种油菜素内酯施用方式,即叶片处理、根系处理、叶片根系同时处理,研究外源油菜素内酯对NaCl胁迫下棉花幼苗的Na+和Cl-吸收、渗透调节及生物量累积的影响。[结果]NaCl胁迫影响棉花生长发育及生理代谢,3种油菜素内酯施用方式均可降低NaCl胁迫下棉花幼苗根、茎、叶的钠、氯离子含量、MDA含量,提高脯氨酸含量,从而使NaCl胁迫下棉花叶片、根系生理功能增强(叶绿素含量升高、根系活力上升),最终使棉花生物量增加。其中,根系施用、叶片根系施用油菜素内酯的2个处理对盐胁迫下棉花根系生物量、根系生理功能的调控效果均好于叶片施用油菜素内酯处理。[结论]3种外源油菜素内酯施用方式均可减轻NaCl胁迫对棉花造成的伤害,但不同的油菜素内酯处理方式对盐胁迫下棉花的调控效果存在差异,根系处理及叶片根系同时处理对减轻棉花盐伤害效果更好。

Effects of Brassinosteroid on Salinity Tolerance of Cotton

[Objective] In order to study the effects of brassinosteroid on salinity toler- ance of cotton. [Method] Three application modes （leaf application, root application and leaf/root application） of brassinosteroid for cotton under NaCI stress were de- signed to understand the effects of brassinosteroid on Na＋ and CI- accumulation, osmotic adjustment substance （proline） and biomass accumulation of cotton under NaCI stress. [Result] NaCI inhibited the growth of cotton seedlings. Compared with the control group, the biomass of cotton seedlings was decreased, Na＋ and CI- contents, MDA content and proline content were increased in cotton under NaCI stress. Under the NaCI stress, three application modes of brassinosteroid significant- ly improved the biomass, chlorophyll content in leaves, root activity and proline content; while Na~ and CI- content, MDA content were decreased. The enhancement of root activity and root physiological functions were more marked in root application and leaf/root application treatments than in leaf/root application treatment. [Conclu- sion] Three application modes of brassinosteroid all could alleviate the NaCI injuries on cotton, but root application and root/leaf application modes of brassinosteroid for cotton under NaCI stress are superior to the leaf application.