化控剂对玉米光合、激素及茎秆力学特性的影响

以东农253为试验材料,在玉米9叶期喷施密高和KP(主要成分DCPTA和ETH),在玉米5个生育时期测定叶片光合酶活、内源激素及茎秆力学特性参数,并进行测产及相关性分析,探究大田条件下化控剂对玉米生长发育的影响。结果表明,喷施密高和KP后叶片SPAD、P_n、RuBPc和PEPc显著提高,增加叶片IAA、GA和ZR含量并降低ABA含量。玉米茎秆单位节间长度干物重、穿刺强度、横折强度和田间致倒伏推力有所增大,降低扁率及子粒含水量,密高和KP处理下玉米产量分别增加6.47%和9.23%。相关性分析表明,除ABA含量与产量呈显著负相关外,光合和其他激素指标呈显著正相关,PEPc、SPAD在完熟期与产量相关性最大,RuBPc在乳熟期与产量相关性最大,P_n在灌浆初期与产量相关性最大。

Effects of Plant Growth Regulator on Character of Photosynthetic,Hormone and Stem Mechanical Properties in Maize

In order to explore the effects of plant growth regulators on the growth of maize under field conditions, hybrid maize Dongnong253 was used as experimental material. Two plant growth regulators, Migao and KP (the main ingredients were DCPTA and ETH) were sprayed on maize leaf on 9-leaf stage, and the water was control. The leaf photosynthetic enzyme activity, mechanical properties of stem and leaf endogenous hormone contents were measured at the five stages, and the yield measurement and correlation analysis were also been conducted. The results showed Migao and KP treatments increased leaf SPAD, P_n, Rubpc and PEPc. Also two plant growth regulators increased leaf IAA, GA and ZR content and reduced ABA content. Simultaneously improved the dry weight per unit length, puncture strength, transverse fold strength, thrust, also reduce the oblateness and grain water content. The yield of Migao content and KP content were higher than those of CK, which was increased by 6.47% and 9.23%. There is a significant positive correlation between PEPc, RuBPc, SPAD, P_n, IAA, GA, and ZR and yield, and negative correlation between ABA and yield.