| 摘要: |
| 利用离体穗培养方法研究了脱落酸（ABA）对小麦穗粒数的调节作用。在开花前15天和开花前8天进行离体穗培养，不同浓度（10-6，10-5,10-4mol·L-1）ABA处理均显著降低穗粒数，ABA的作用一方面是降低了离体器官的蔗糖吸收量（源调节），另一方面是降低了穗器官的蔗糖代谢活性（库调节）。开花期穗培养，ABA处理对穗粒数的影响力较小，而且主要是通过降低蔗糖吸收量而起作用。试验结果表明，在小麦穗发育过程中，蔗糖与ABA的相互作用可能是穗粒数的重要生理调控机制。 |
| 关键词: 小麦,穗粒数,ABA |
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| Abstract: |
| The effect of abscisic acid (ABA) application on requlating grain number was examined using detached wheat ears in liquid culture. In ears detached 15 or 8 d before anthesis, applying ABA in any concentration could reduce grain numbers through decreasing sucrose uptake (source regulation ) and sucrose metabolism activity (sink regulation) of cultured ears. The influence of ABA application at anthesis was mainly an indirect effect on grain number, and its impact mainly expressed as the reductions in sucrose uptake.The results suggested that the interaction of ABA and sucrose might be an important regulation mechanism for grain number of wheat. |
| Key words: wheat,grain number,ABA |
