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变温贮藏对中国水仙主芽ABA和GA相关基因的表达分析

2018-06-21姚婷婷蒲小龙叶露莹宋敏娜李小婷叶如梦宁俊楠郭志雄佘文琴潘东明

热带农业科学 2018年2期

姚婷婷 蒲小龙 叶露莹 宋敏娜 李小婷 叶如梦 宁俊楠 郭志雄 佘文琴 潘东明

摘 要 以3年生中国水仙品种‘金盏银台主芽为试验材料,经5和35℃变温贮藏水仙球,通过石蜡切片形态解剖学观察主芽活力,利用qRT-PCR方法分析水仙主芽在贮藏时期ABA和GA相关基因表达变化。结果表明,水仙主芽生长点的细胞排列紧密,35℃高温贮藏有利于水仙主芽的生长发育。qRT-PCR分析表明,贮藏期间ABA合成和代谢相关基因呈现不规则变化趋势,变温贮藏对NtABA2基因影响显著;GA相关基因整体呈下降趋势,变温贮藏对NtGA20X基因影响显著。

关键词 变温 ;贮藏 ;水仙 ;芽

中图分类号 S682.2+1 文献标识码 A Doi:10.12008/j.issn.1009-2196.2018.02.010

Abstract Bulbs of Narcissus variety Jinzhanyintai at the age of 3 years old were stored at the changing temperatures of 5 C and 35 C and was embedded in paraffin and cut into sections for morphological and anatomical observation of the vigor of their main buds. The change of the ABA and GA - related gene expression of the main buds of the bulbs during the storage was analyzed by using the qRT-PCR. The results showed that the cells of the main buds of Narcissus bulbs in the growth points were closely arranged, and their storage at the high temperature of 35 C was beneficial to the growth of Narcissus main buds. The qRT-PCR analysis showed that the genes related to ABA synthesis and metabolism tended to change irregularly, and that the storage at the changing temperature had significant effect on NtABA2 gene. The GA-related genes tended to decrease in general, and the storage at the changing temperature had significant effect on NtGA20X gene.

Keywords changing temperature ; storage ; Narcissus ; bud

中国水仙(Narcissus tazetta var. chinensis)屬石蒜科水仙属多年生草本植物,具有很高的观赏价值,是中国十大名花之一,在春节开花,受到很多人的喜爱。中国水仙因夏季高温无法继续生长而以鳞茎芽的形式进入休眠,温度是影响水仙休眠的重要因素之一[1],温度也是影响植物休眠解除重要的环境因素[2-3]。

温度不同对植物休眠解除结果也不同,高温(高于70℃)能够打破豆科种子物理休眠[4-5],高温也可打破有些植物休眠。孙红梅等[6]发现,利用变温处理方式可解除百合鳞茎休眠;高东升等[7]和熊国胜等[8]发现,5℃是打破休眠的最佳温度,但是也有些植物是在0℃以下打破休眠,而某些植物在低于0℃的环境下反而促进休眠,夜晚-13~-4℃的温度可促进美国山核桃的芽萌发[9]。

脱落酸(ABA)和赤霉素(GA)是影响植物生长的重要激素,其中ABA 是调控种子休眠和萌发重要的植物激素;……

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