摘要
通过检测植物生长激素研究了苗期玉米的旱后复水补偿性生长机制。结果表明:干旱胁迫导致玉米苗具有较低的地上部分和整株生物量,但复水12d后旱后复水玉米苗的地上部分和整株生物量已与充分供水玉米苗之间没有了显著差别。地上生物量指数和总生物量指数,是用来评价玉米苗复水后的地上部分生物量和总生物量相对于它们自身复水前变化的指标,复水后旱后复水玉米苗呈现较高的地上生物量指数和总生物量指数。通过检测叶片和伤流液中的玉米素和玉米素核苷(Z+ZR)含量,发现旱后复水玉米苗的叶Z+ZR含量与地上生物量指数和总生物量指数联系密切,且其叶Z+ZR含量受根系的直接调控。总之,根系诱导的叶片细胞分裂素是影响玉米苗旱后复水补偿性生长的关键因素。
The compensatory growth mechanism after corn re-watering at seeding stage was investigated by testing plant hormones.Results showed that drought stress caused low biomass of aboveground and whole plant,and there was no significant difference for the biomass of aboveground and whole plant between the two treatments of re-watering after drought stress and adequate watering after six days since re-watering.Aboveground biomass index and total biomass index are the indexes indicating biomass variance of aboveground and whole plant based on their pre-rewatering biomass,respectively.High aboveground biomass index and total biomass index occurred in the treatment of re-watering after drought stress.Concentrations of zeatin and zeatin riboside（Z＋ZR）,in leaves and xylem sap were measured.The results showed that the value of aboveground biomass index and total biomass index were adjusted by leaf Z＋ZR,and that roots regulated leaf Z＋ZR concentration.Therefore,root-induced leaf cytokinin is the key factor affecting corn compensatory growth after re-watering at seeding stage.
出处
《水土保持研究》
CSCD
北大核心
2016年第4期300-305,312,共7页
Research of Soil and Water Conservation
基金
河南省教育厅自然科学研究项目(2011A180012)
国家自然科学基金(U1304326)
