马铃薯蕾期摘心对块茎发育过程中激素含量的影响

Effects of Pinching in Bud Stage on the Hormones in the Process of Tuber Formation in Solanum tuberosum L.

在常规种植条件下,对蕾期马铃薯进行摘心处理,研究其对块茎发育过程中激素含量的影响,从而明确摘心处理对促进块茎发育的生理机制。研究结果表明,与不摘心相比,摘心处理明显增加了块茎发育中期GA3、IAA和ZT的含量,使JAs含量一直处于上升的趋势,并且改变了JAs含量出现高峰的时间。从激素间的平衡关系看,摘心处理提高了块茎发育中期IAA/ABA、IAA/JAs、GA3/ABA、GA3/JAs值,降低了块茎发育前期和后期其比值,说明蕾期摘心主要是通过改变块茎发育各时期激素的含量和平衡状态,优化了块茎发育中期的激素水平。

In order to elucidate the physiology mechanism of pinching in bud stage to accelerate tuberization, the changes of endogenous hormones in the process of tuber formation in potato （Solanum tuberosum L. ） were analyzed . The results showed that in the middle stage of tuber formation, GA3, IAA and ZT content increased obviously, the high peak time and changing trend of JAs content were changed. For the balance relationship among the IAA, GA3, JAs and the ABA, the value of IAA/ABA, IAA/JAs, GA3/ABA and GA3/JAs were raised at the middle stage of tuberization and were reduced at prophase and anaphase. Plucking hearts could alter the content of hormons and the relationships among them, opitimize the level of hormones in the middle stage of tuberization and improve the tuber development.