灌浆期低温对离体玉米子粒灌浆过程及内源激素的影响  

Effect of Grain Filling and Endogenous Hormones Changes on Maize Grains in Vitro Culture under Low Temperature Stress During Grain Filling Stage

作　　者：张巽[1,2] 张萍[2] 陈璐洁[2] 陶洪斌[2] 王璞[2] 

机构地区：[1]山西大同大学生命科学学院,山西大同037009 [2]中国农业大学农学院,北京100193

出　　处：《玉米科学》2017年第2期49-54,共6页Journal of Maize Sciences

基　　金：国家现代产业技术体系建设专项(CARS-02-26);山西省大同市基础科技项目(2015105)

摘　　要：以郑单958为材料,采用子粒离体培养方法,研究灌浆期低温对玉米强、弱势粒灌浆特性及内源激素的影响。研究表明,灌浆期低温分别减缓强、弱势粒平均灌浆速率15%、23%,延长灌浆时间约8 d,最终粒重分别降低3%、9%。低温处理下,GA_3、IAA、ZR含量与灌浆速率显著相关;受低温影响,强、弱势粒的激素含量变化趋势相近,与常温相比,子粒GA_3含量先增加后减少,IAA、ZR含量低于对照,且对弱势粒的影响大于强势粒。低温对内源激素含量的影响是导致灌浆速率降低的主要原因之一。Zhengdan958 was used as the material, the effects of superior and inferior maize grain filling and en-dogenous hormones changes on maize grains in vitro culture under low temperature stress during grain filling stagewere studied. The results showed that, when the temperature was low on grain filling stage, the average rate of grainfilling of superior and inferior kernels could be reduced by 15% and 23%, respectively, and the grain filling dura-tion would be extended for 8 days. Compared to the controls, the dry weight of superior and inferior kernels were 3%and 9% less. The content of GA_3, IAA and ZR were significantly correlated with the graining filling rate under lowtemperature. In addition, endogenous hormones content of superior and inferior kernels had a similar changingtrend. Compared with normal temperature, GA_3 content of kernels climbed up then declined, while the content ofIAA and ZR were lower. Moreover, low temperature caused more serious influence on inferior kernels. It could bededuced that the decrease of grain filling rate of kernels should be ascribed to the effect of low temperature on en-dogenous hormones.

关 键 词：玉米 低温 离体培养 激素 灌浆特性 

分 类 号：S513.01[农业科学—作物学]