摘要
应用32 P研究了金钗石斛对磷素的吸收和运转。结果表明 ,金钗石斛植株各部位均可吸收磷素 ,成长叶的总放射性活度最高。植株吸收的总32 P放射性活度随根系吸收时间的延长而增加 ,至 96h达最高 ;随移栽后日龄的增加 ,植株各部位干物重逐渐增加 ,新生茎和新生叶增加最快 ,32 P亦逐渐向新生茎和新生叶运转。 2 5℃和 40℃温度处理 ,植株吸磷量分别为 1 0℃处理的 2 3和 2 5倍。中度光 ( 2× 1 0 4 Lx)和高光强( 5× 1 0 4 Lx)下植株吸磷量分别较弱光 ( 5× 1 0 3Lx)下增加 74%和 2 3 %。
The characteristics of absorption and translocation of phosphorus in dendrobe were revealed by using 32 P.The results indicated that each part of dendrobe could absorb phosphorus,and the highest plant total radioactivity was obtained in the treatment of labelled mature leaf.The plant total 32 P radioactivity increased with the root uptake time and reached the highest 96 hours after absorption.With the increase of days after transplanting,plant dry weight increased steadily and 32 P was translocated into young stem and young leaf in which dry weight also increased most quickly.The amounts of phosphorus in 25℃ and 40℃ treatments were 2\^3 and 2\^5 times of that in 10℃ treatment,respectively.The absorbed phosphorus under intermediate light intensity (2×10 4Lx) and high light intensity (5×10 4Lx) increased by 74% and 23% compared with low light intensity (5×10 3Lx),respectively.
出处
《核农学报》
CAS
CSCD
北大核心
2002年第3期162-166,共5页
Journal of Nuclear Agricultural Sciences
基金
国家自然科学基金资助项目 (39770 90 3)
