摘要
淹水 2 d后 ,玉米苗基节内即有不定根原基形成 ,早于正常植株。淹水 15 d后 ,从基节部长出的不定根数多于正常植株 ,但淹水导致根系生长和干物质积累大幅度下降。淹水幼苗不定根伸长区内有发达的通气组织形成 ,使根内部组织孔隙度大幅提高。电镜细胞化学研究表明 ,经 15 d淹水后 ,不定根根尖细胞内 ATP酶的分布与正常幼苗基本相同 ,酶活性尽管有一定的下降 ,但仍保持较高水平。根据实验结果 。
Formation of adventitious root primordia in the basal node of maize seedlings is observed after 2 days in plants that have been flooded:earlier than in unflooded maize seedlings.The number of adventitious roots growing from the basal node in maize seedlings flooded for 15 days is significantly higher than in unflooded seedlings.However,flooding also strongly reduces the growth of adventitious roots and dry matter accumulation of the whole root system.By 15 days of flooding maize seedlings have produced many aerenchyma formations in adventitious roots.These markedly increase the internal porosity of adventitious roots.Results of ultracytochemistry research show that the ATPase distribution pattern in adventitious root apical cells of maize seedlings flooded for 15 days is similar to that of normal maize seedlings. The ATPase activity in root apical cells of flooded maize is lower than in normal maize,though still very high.The discussion addresses the relationship between adventitious root,their internal aerenchyma formation and the flooding tolerance of plant.
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第3期293-297,共5页
Chinese Journal of Plant Ecology
基金
国家"九.五"科技攻关项目的子项目!( 95 -0 0 1-0 4-0 2 )
关键词
淹水
玉米
不定根
通气组织
ATP酶
Flooding,Maize,Adventitious roots,Aerenchyma, ATPase
