不同生长调节物质浸种对玉米种子萌发生长及水分利用效率的影响

通过室内培养试验、砂培试验和土培试验研究了不同生长调节物质浸种对玉米种子发芽、幼苗生长及水分利用效率的影响。室内培养试验和砂培试验表明,低浓度矮壮素(2.5gk/g和5.0gk/g)和6-BA(0.010gk/g)处理提高了农大108的发芽率、发芽势和幼苗及根系干重,高浓度处理则表现出明显的抑制作用。土培试验表明,使用CCC、6-BA及其配合均不同程度提高了农大108和陕单902玉米叶片叶绿素SPAD值和光合作用速率,促进了根系生长和干物质的累积。用生长调节物质浸种对玉米水分利用效率的影响与玉米品种及水分供应水平有关。且水分胁迫下的水分利用效率增幅明显高于正常水分下,正常水分和水分胁迫下农大108的水分利用效率提高为1.83%～4.57%和2.31%～7.51%,陕单902分别为2.84%～12.80%和11.05%～15.26%。

Effects of Soaking of Seeds with Growth Regulator Substances on the Germination and Seedling Growth and Water Use Efficiency of Maize

Cultured experiment,sand cultured experiment and pot experiment were used to evaluate the effects of soaking of seeds with different growth regulator substances on the germination,seedling growth and water use efficiency of corn.The result showed that the germination ratio(GR),germination index(GI),dry matter weights of shoot and root of Nongda 108 were increased by soaking of seeds with low concentration of Chlormequat(CCC,2.5 g/kg and 5.0 g/kg) and 6-BA(0.010 g/kg) in cultured experiment and sand cultured experiment;These parameters were obviously decreased when the concentration of CCC and 6-BA were high.In pot experiment,seeds treated with CCC,6-BA,and 6-BA CCC increased the SPAD value of chlorophyll in leaves and photosynthetic rate of maize cultivars of Nongda 108 and Shaandan 902;It also improved the growth of shoot and root.Water use efficiency of seeds soaking with different growth regulator substances was relative with maize cultivars and soil water content.The increase rate of water use efficiency in water stress was more obvious than its in normal water.In normal water and water stress,the increase rate of water use efficiency were 1.83%-4.57% and 2.31%-7.51%,Shaandan 902 were 2.84%-12.80% and 11.05%-15.26%.