兰竹荔枝胚珠内源激素含量变化与胚胎发育的关系

RELATIONSHIP BETWEEN EMBRYONIC DEVELOPMENT AND CHANGES OF ENDOGENOUS HORMONES IN LITCHI (LITCHI CHINENSIS SONN.) OVULES

以兰竹荔枝胚胎发育时期的正常胚珠与败育胚珠为试验材料 ,研究了胚胎发育与内源激素的关系 .结果表明 :正常胚珠中IAA、GA1+ 3 和ABA含量均在花后 7d达到峰值 ,随后呈下降趋势 ;但IAA和GA1+ 3 含量在心形胚至鱼雷胚时期都有所回升 ,CTK含量在球形胚之前一直很高 .败育胚珠中ABA含量在胚胎败育期保持较高水平 ,IAA和GA1+ 3 则降到最低点 ,CTK含量亦明显低于正常胚珠 .ZRs、DHZRs和iPAs含量变化有不同特点 ,并影响不同发育时期的胚胎发育 .还探讨了n(ABA)n-1(IAA +GA1+ 3 )和n(ABA)n-1(CTK)比值与胚胎发育的相关性 .图 3参

The normal and aborted ovules of litchi ( Litchi chinensis Sonn. cv. Lanzhu), at developmental stage, were used as experimental material. The relationship between embryonic development and changes of endogenous hormones in litchi ovules was studied. The results showed that the contents of IAA, GA 1+3 and ABA in normal ovules reached their highest level on the 7th day after anthesis, and then decreased, but the contents of IAA and GA 1+3 increased again from heart to torpedo stage, and CTK content was higher before the globular stage. ABA content in aborted ovules maintained a relatively high level, but the contents of IAA and GA 1+3 dropped to the lowest level, and CTK content was obviously lower than that in normal ovules during the embryo abortion. The changes in the contents of ZRs,DHZRs and iPAs showed different characteristics and affected the embryonic development at different stages. The relationship between the ratios of n (ABA) n -1 (IAA+GA 1+3 ), n (ABA) n -1 (CTK) and embryonic development was also discussed. Fig 3, Ref 10