不同类型龙眼种子发育过程中内源激素含量变化

The Content Changes of Endogenous Phytohormones in Different Types of Longan Seeds During the Development Process

以焦核龙眼品种白核、闽焦64-1、闽焦64-2和大核品种九月乌为试材,研究了龙眼种子早期发育过程中内源激素含量的变化。结果表明,龙眼种子发育前期大量的GA3被合成与积累,GA3含量随着种子发育逐渐下降。九月乌的IAA含量在花后40 d达到最高,且高于3个焦核龙眼品种。九月乌(IAA+GA3)/ABA比值在花后30～40 d基本不变,而3个焦核品种呈现出急剧下降的趋势,花后40～60 d九月乌的(IAA+GA3)/ABA比值先降低后上升,而3个焦核品种均在上升。由此可推测焦核龙眼落果主要受到IAA和ABA的影响,焦核龙眼早期果实发育IAA含量升高将减少焦核果的落果,有利于焦核率的提升。

The content changes of endogenous phytohormones in Longan seeds during the early development were studied by using ＇ Baihe＇ , ＇ Minjiao 64 - 1 ＇ , ＇ Minjiao 64 - 2＇ and ＇ Jiuyuewu＇ as test materials. The results showed that a large number of GA3 was synthetized in the early stage, then the content gradually reduced with the development. 40 days after full bloom, IAA content of ＇Ji- uyuewu＇ increased to the highest level, the content was higher than that in 1＇ and ＇ Minjiao 64 - 2＇. The ratio （ IAA ＋ GA3 ） /ABA of ＇ Jiuyuewu＇ c ＇ Baihe＇ , ＇ Minjiao 64 hanged little during 30 40 days after full bloom, while the ratio of three abortive - seeded cultivars declined obviously. 40 - 60 days after full bloom, the ratio （ IAA ＋ GA3 ） /ABA of ＇ Jiuyuewu＇ declined first then rose, while the ratio of three abortive - seeded cuhivars rose continuously. According to the results, it seemed that fruit - dropping of abortive - seeded Longan cultivars was influenced by IAA and ABA, high IAA level in early stage of fruit development would reduce the fruit - dropping of abortive - see- ded Longan, and increase the ratios of abortive - seeded.