植物生长调节剂影响沙田柚内源激素水平的研究

研究了植物生长调节剂优康唑和CPPU对沙田柚生理落果期间幼果和新梢叶片内源IAA、GA1 3和ABA水平的影响.研究结果表明:优康唑处理降低新梢叶片内源IAA和GA1 3水平,提高细胞分裂素含量.优康唑对叶片ABA含量和(IAA GA1 3 CTKs)/ABA比值影响不明显;优康唑处理下幼果IAA、GA1 3和ABA含量均有不同程度的下降,以GA1 3下降幅度最大.果实中CTKs含量和CTKs/ABA比例上升,结合优康唑和CPPU促进沙田柚座果的效应,提示细胞分裂素对座果有重要作用,而CTKs/ABA比例升高有助于缓解生理落果;CPPU处理降低果实ABA含量,提高果实CTKs水平和CTKs/ABA比值.这可能是CPPU促进座果和果实膨大的生理基础.

Effects of Plant Growth Regulators on Endohormones Levels in Shatian Pomelo

Effects of Uniconazole arid CPPU on IAA, GA1 3 ABA contents in leaves and young fruits of Shatian pomelo during physiological fruit drop period were studied by enzyme linked immunosorbent assay (ELISA). The results showed that: Uniconazole treatment reduced endogenous IAA, GA1 3con- tents in new shoot leaves, increased CTKs contents. Effects of uniconazole on ABA content and (IAA GA1 3 CTKs) /ABA ratio in leaves were not significant. Uniconazole reduced IAA, GA1 3 ABA contents in young fruits, and increased CTKs contents, CTKs/ABA ratio. Corresponding to the promotive effect of fruit-set by uniconazole and CPPU, it suggested that CTKs played an important rule on fruit-set, and the increase of CTKs/ABA ratio could reduce physiological fruits drop. CPPU treat- ment dereased ABA contents, improved CTKs contents and CTKs/ABA ratio in frtuit, it may be the physiological basic of stimulating fruit -set and fruit expanding by CPPU.