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初花期至盛花期华双 3号、华杂 4号、恢 590 0等 3个品种花蕾的ｉＰＡｓ含量呈明显上升趋势,而秦油 2号则刚好相反 (表 2 )。对双低品种华双 3号功能叶的研究表明 :苗期至盛花期ＩＡＡ含量始终最高 ,其后依次是ＧＡ1 +3 、ｉＰＡｓ、ＡＢＡ。功能叶ＩＡＡ的含量在越冬期处于整个生育期的最低水平 ,蕾薹期达到高峰 ,随后下降 ;ＧＡ1 +3 和ｉＰＡｓ含量随生育进程逐渐升高 ,并在初花期达到峰值 ;ＡＢＡ在苗期及抽薹后一直处于很低水平 ,但在越冬期达到最高值 (图1、2 )。蕾薹期ＩＡＡ主要分布在幼嫩和正在生长的器官中并起重要作用 ,而在功能叶中相对要少 ;幼叶ＧＡ1 +3 和ｉＰＡｓ含量最高 ,功能叶其次 ,花蕾最低 (表1 )。角果皮与籽粒的内源激素含量差异极显著 ,在开花后第 39天 ,籽粒中ＩＡＡ、ＧＡ1 +3 、ｉＰＡｓ的含量大大超过角皮 (表 3)。结果表明ｉＰＡｓ在促进籽粒的充实饱满、物质积累转化方面发挥重要作用。
The content of iPAs in flower buds from early flowering stage to full flowering stage, such as Hua Shuang 3, Hua Za 4 and Hui 590 0, showed an obvious upward trend, while Qinyou 2 showed the opposite (Table 2). The study on the double-leaf variety Hua Shuang 3 showed that the content of IAA remained the highest at the seedling stage and the flowering stage, followed by GA1 +3, iPAs and ABA. The contents of IAA in functional leaves were the lowest during the whole growing period during the winter and peaked at the budding stage and then decreased. The contents of GA1 +3 and iPAs increased gradually with the growth stage and peaked at the first flowering stage. After bolting has been at a very low level, but reached the highest value during wintering (Figure 1,2). IAA in budding stage mainly distributed in young and growing organs and played an important role, but relatively less in functional leaves; young leaves GA1 +3 and iPAs content highest, followed by functional leaves, buds the lowest (Table 1). The content of endogenous hormones in the pericarp and grain were significantly different. On the 39th day after flowering, the contents of IAA, GA1 +3 and iPAs in the grains were significantly higher than those in the keratin (Table 3). The results showed that iPAs played an important role in promoting full and full grain accumulation and material accumulation.