杂种小麦拔节期磷素吸收的示踪研究

STUDY ON THE DYNAMICS IN ABSORPTION OF ^(32)P BY HYBRID WHEAT AT ELONGATE STAGE

于盆栽条件下研究了拔节期杂种小麦的吸磷动态.结果表明,具优势的杂种小麦(产量超亲优势率24%—32%)磷素吸收量的变化符合一元二次回归方程;y=a十bx十cx^2.与亲本相比,其吸收量增加的幅度随时间而增大,而其吸收率下降的速率显著低于其亲本,杂种的根系活力也显著提高.杂种小麦吸收磷素的整体优势等于各器官的优势之和.

The dynamics of absorpting 32P of hybrid wheat at elongate stage is studied under pot culture conditions. The results show that the absorption capacity of hybrid wheat to 32P is in agreement with regression equation: y=a+bx+cx2. The increased extent of absorption for them is greater than that for parent with time, and the reduction rate of absorption is lower than the parent significantly. Their root activity is much higher than that of the parent, too. The overall heterotic vigour of hybrid wheat on the absorption capacity to 32P is the sum of that of all organs.