摘要
用渗透势不同的聚乙二醇（ＰＥＧ）６０００模拟外界环境水分条件，对玉米不同品种的种子在萌动、萌发及成苗三个阶段需水的量化研究表明，种苗的抗旱性随吸水进程的推进而减弱；种子在萌动、萌发及胚芽伸长至一定长度的时间（ｔ）与外界环境水势（ｗ）之间存在着１／ｔ＝ａ＋ｂｗ的关系，据此推算出不同品种在不同成苗阶段的需水阈值，发现不同品种在同一成苗过程中对环境水分条件的反应不同，它们的抗旱性也不同。
Water requirements during stages of maize seeds radicle emergence, plumule emergence and seedling establishment have been studied with PEG imitating external water potentials. The experiments demonstrate that drought - resistance abilities of each cultivar drow with water tiptake proceeding; the relationships between radicle emergence time, plumule emergence time or seedling establishment time and external water potential seperately can be regressed with the formula 1/t=a+bw,and the critical water potentials derived from the formula exist difference within each cultivar.
出处
《西北植物学报》
CAS
CSCD
北大核心
1996年第1期34-37,共4页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金
关键词
玉米
种子
幼苗
萌发
需水阈值
maize, radicle emergence, plumula emergence, critical water potential
