菜心下胚轴气孔大小的动态变化

Dynamic Change of the Stomata Size in the hypocotyl of Mock Pad-choi

[目的]为菜心气孔的分布和发育学研究奠定基础。[方法]以油青60天和四九-19这2个菜心品种为材料,研究菜心下胚轴气孔长度和宽度在2年内随不同发育时间的变化情况。[结果]油青60天下胚轴气孔长度在下胚轴整个发育时期均不断上升下降,说明在幼苗生长发育过程中,随着下胚轴的生长,仍不断有新的气孔形成。四九-19下胚轴2年的平均气孔长度在生长的第3～9天持续上升;在第9～18天急剧下降后又迅速上升;第21～27天,气孔长度虽有变化,但变化不显著。2种菜心在下胚轴生长初期(第3～9天),气孔宽度变化幅度很大;随着幼苗的生长,下胚轴生长中期(第9～18天),气孔宽度减小;下胚轴生长后期(第21～27天)仍有气孔生成。[结论]菜心下胚轴整个发育时期不断有气孔形成。

[Objective] The basis of the research on the distribution and development of stomata in the hypocotyl of mock pad-choi（Brassica parachinensis）was provided.[Method] The variety-Youqing 60-day and Sijiu-19 being taken as the experimental material,the variation of the length and width of stomata in the hypocotyl surface of mock pad-choi in the different development stages of 2 years were investigated.[Results] The results showed that the length of the stomata in the hyocotyl of Youqing 60-day was firstly increased and then decreased,which indicated that there was still new stomata formation in growing hypocotyl with the development of the variety.Average length of stomata of Sijiu-19 was continually increased from the 3rd day to 9th day;then sharply declined from the 9th day to18 th day;and finally,raised again;and during the period from the 21st day to 27th day,the variation of the length of stomata was not significant.From the 3rd day to 9th day when it was the initial time of hyocotyl-growing,the change of the width of stomata was significant;from the 9th day to 18th day when it was in the middle stage of hyocotyl-growing the width of stomata was reduced;and from the 21st day to 27th day—late stage,the stomata was still being formed.[Conclusion] During whole period of hyocotyl-growing,the stomata was continually produced.