摘要
在水分亏缺条件下 ,适宜的氮素水平可使玉米叶肉细胞膜相对透性维持在较低的范围内 ,而当营养液中氮素水平达 2 0 mmol/L时 ,细胞质膜透性比同水平氮素处理的对照提高 6 0 .7% ;缺氮和氮素水平过高时 ,均会增加叶肉细胞的 MDA含量。叶绿素总量和叶片含氮量随氮素水平的提高而增加 ,但当继续提高氮素水平时 ,有饱和趋势 ;适宜的氮水平能提高水分胁迫下叶片中酶促防御系统的活性 ,其中 SOD活性明显高于对照。适量的氮素能够使水分亏缺条件下叶片光合速率和生长量增加 ,因此认为 ,在水分亏缺时 。
Under water deficit, relative plasma membrane permeability of maize mesophyll cell is controlled at low range by favorable nitrogen level, but it can be increased 60.7% to control (CK) by 20 mmol/L in Hoagland nutrition solution. Malondialdehyde (MDA) in maize mesophyll cell can be raised by deficit and excess nitrogen. Chlorophyll and nitrogen content can be increased to increase nitrogen level, but there is a saturation phenomenon. The activity of protective enzymes SOD,POD,CAT,photosynthesis rate and biomass could be increased by suitable nitrogen level under water deficit. But the activity of SOD rise to CK.We think that nitrogen for crop drought resistance has double role in water deficit.
出处
《西北农业学报》
CAS
CSCD
2001年第1期7-10,共4页
Acta Agriculturae Boreali-occidentalis Sinica
基金
国家重点基础研究发展规划项目 !(G19990 1170 0 8)
国家青年科学基金资助课题! (5 990 90 0 7)
