摘要
1987～1989年试验结果表明,中度水分胁迫对玉米不同品种各生育时期生长发育均有抑制作用,但抗旱性较强的豫玉3号等品种,在干旱条件下可通过叶面积、干物重、根量和根系活跃吸收表面积减少幅度小,促进雌雄穗分化和发育顺利进行,因此生长发育和产量形成受干旱影响较轻。所有品种苗期适度干旱可促进根系生长,且表现有较强的适应干旱的能力,但拔节后抗旱力减弱,尤其在性器官形成期受干旱损伤最重,减产最大。一个品种的抗旱性的表现主要取决于拔节以后,孕穗期—开花期对干旱抵抗能力和产量的高低。
The results of experiments in 1987～1989 showed that moderate water stress inhibited growth and development of maize varieties at different stages. But variety Yuyu 3 posessed stronger ability to resist drought. Its leaf area, dry matter, the ratio of shoot to root and active absorption area of root decreased less under drought condition. Drought at seedling stage enhanced root growth of varieties, and increased adaptation ability. The ability to resist drought dropped down after shoot elongation, especially during the stage of sexual organ formation when drought caused serious injry and significant decrease of yield. Drought resistance of a variety was mainly expressed by the ability to resist drought from shoot elengating to flowering.
出处
《沈阳农业大学学报》
CAS
CSCD
1990年第3期181-185,共5页
Journal of Shenyang Agricultural University
基金
国家七.五期间农业部重点课题
关键词
玉米
豫玉3号
生育期
抗旱性
产量
water stress
plant height
leaf area
ratio of shoot to root
differentiation of ear
