油菜生长发育期间内源激素含量的变化

初花期至盛花期华双3号、华杂4号、恢5900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的含量大大超过角果皮(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。

Changes in Endogenous Hormone Content of Brassica napus During Growth and Development

Study on different varieties/hybrids of rapeseed ( Brassica napus L.) showed that iPAs content in the bud increased distinctly from the early flowering stage to the peak flowering stage for Huashuang No.3, Huaza No.4, the restorer line of Huaza No.4 Hui 5900, but decreased for Qingyou No.2. Analysis of functional leaves of Huashuang No.3, a "double low" variety, showed that IAA content in the functional leaves was always the highest, and GA 1+3 , iPAs, ABA contents decreased orderly, during the period from the seedling stage to the peak flowering stage. The IAA content was at the lowest level during winter, reaching the highest level during the bud stage, and then decreased as the leaf dry weight declined. The GA 1+3 and iPAs contents increased along with development, and reached its peak at the early flowering stage. The ABA content was very low at the seedling stage and after elongation stage. However it reached its maximum in winter. At budding and elongation stages, IAA was distributed mainly in young and growing organs, but less in functional leaves. In the same period, GA 1+3 and iPAs contents were highest in young leaves, lowest in buds and flowers, and were at the medium level in functional leaves. The difference in endogenous hormone content between the pericarp and the seed was extremely significant. On the 39th day after flowering, the IAA, GA 1+3 , and iPAs contents in the seed were higher than those in the pericarp, respectively. iPAs played a very important role in promoting seed filling and the accumulation and transformation of organic matter.