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以玉米光温敏无雄穗系I17及其正常系N17植株为试验材料,在春季和秋季种植条件下分别测定叶片与雄穗中生长素(IAA)、脱落酸(ABA)、赤霉素(GA3)和玉米素(ZT)的含量,研究植物激素对玉米光温敏无雄穗系植株雄穗发生及其育性的影响。结果表明,春季种植的无雄穗系I17与正常系N17的叶片和雄穗中IAA、GA3、ZT和ABA含量没有明显差异;秋季种植的无雄穗系I17叶片中IAA、GA3和ZT含量在苗期、抽雄期及花粒期均显著低于正常系N17,ABA含量显著高于N17。在植物激素平衡方面,秋季种植的无雄穗系I17叶片中IAA/ABA、GA3/ABA及ZT/ABA的比值均显著低于正常系N17的相应值。IAA、GA3和ZT的严重亏损与ABA的过量积累是引起玉米无雄穗的重要原因之一。
The photosynthetic rate of IAA, ABA and GA3 in leaves and tassels were measured under spring and autumn planting conditions using maize photo-thermo-sensitive non-tassel line I17 and its normal line N17 as test materials. GA3) and zeatin (ZT), and the effects of phytohormone on tassel emergence and fertility in maize with photo-thermo-sensitive and non-tassel panicle lines were studied. The results showed that the content of IAA, GA3, ZT and ABA in leaves and tassels of non-tassel line I17 and normal line N17 were not significantly different in spring. The content of IAA, GA3 and ZT in leaves of non-tassel line I17 Stage, tasseling stage and pollen stage were significantly lower than the normal line N17, ABA content was significantly higher than N17. In plant hormone balance, the ratio of IAA / ABA, GA3 / ABA and ZT / ABA in the non-tassel I17 line planted in autumn was significantly lower than that of the normal line N17. One of the important causes of maize spike was the serious loss of IAA, GA3 and ZT and the excessive accumulation of ABA.