萘乙酸(NAA)对盆栽冬红果叶片衰老的影响

The Effects of NAA on Leaf Senescence of Potted Malus Spectabilis

冬红果是制作观果盆景的主要树种之一,本试验对盆栽冬红果衰老过程中叶片的内源激素含量、叶绿素含量以及脱落情况进行了比较和分析。试验得出:盆栽冬红果叶片的衰老过程与内源激素的变化有密切联系,IAA含量的下降与ABA含量的上升,合成一些促进衰老的物质。萘乙酸能延缓叶绿素含量的降解,D处理(NAA140mg/L)效果最佳。经过合适浓度萘乙酸处理的冬红果叶片中内源IAA含量高峰提前出现达到高峰,抑制ABA含量的升高趋势,D处理(NAA140mg/L)延缓叶片衰老的效果最好。较低浓度的处理会产生相反的效应,加速衰老。

Malus spectabilis is one of the main cultivar of making fruit potted landscape. In this paper, senescence of potted Malus spectabilis leaves was studied, the content of endogenous hormone and chlorophyll and leaf loss situation were compared and analyzed. The results are as follows： Ripening and senescence of leaves of Malus spectabilis had a close relationship with endogenous hormone, the decreasing of IAA （Indole-3-Acetic Acid） content and the increasing of ABA （Abscisic Acid） content engendered some senescence materials. By testing Chl content and observing of leaf abscission layer microstructure, it was indicated that NAA could retard Chl degradation. The result showed that D treatment （NAA at 140mg/L） had the best effect. The treatment at suitable concentration could achieve the peak earlier in IAA content and inhibit the rising trend of ABA content. The D treatment （NAA at 140mg/L） was the best treatments to delay the ripening and senescence. Otherwise, the treatment at lower concentration has the appositive effect and accelerated senescence.