沾化冬枣花果发育过程中氮素和细胞分裂素的变化动态研究

Changes of CTK and Few Nitrogen Index During Development of Flower and Fruit in Zhanhua Jujube

以沾化冬枣(Zizyphus.Jujuba Mill.var.inermis.)为试材,研究了花果发育期间ZR(玉米素核苷)i、PA(异戊烯基腺苷)以及氨基酸、可溶性蛋白和总氮等指标的变化动态。结果表明:ZR和iPA在沾化冬枣花器官发育过程中起着重要作用,果实的发育基本表现为"慢-快-慢-快-慢"的变化趋势,纵径生长略高于横径。花和果实的发育过程中,各氮素指标与细胞分裂素(ZR+iPA)的变化可显著分为3个阶段:一是从显蕾期至瓣平期,此期细胞分裂素和各氮素指标迅速上升,达到最高峰;二是从瓣平期到硬核时(花后45 d左右),此期各指标迅速下降至最低点;三是从硬核时至采收,此期果实内各氮素指标缓慢回升,细胞分裂素(ZR+iPA)出现一高峰后下降。

The experiment was conducted on Zhanhua jujube to study the changes of ZR, iPA and few nitrogen index during the development of flower and fruit. The result showed that ZR and iPA played an important role before blossom which advanced the build up of flower organs. The fruit development of Zhanhua jujube showed a trend of ＂slow - fast - slow - fast - slow＂ and the growth of vertical diameter was faster than transverse diameter. Nitrogen index and CTK（ZR ＋ iPA） could be remarkably divided into three stage in the period of flower and fruit development. The level of these nitrogen index increased at first and reached a high peak from the floral bud appearing to petal flatting. Second, From petal flatting to 45 days after flowering, these index decreased gradually. Three, These nitrogen index had a slight increase before maturation and CTK（ZR ＋ iPA）appeared a peak then decreased gradually .