Abstract: Solution culture was conducted to study on the aspects,such as root morphology,P uptake efficien-cy,P utilization and translocation efficiency,et al. The mechanism of the difference in P efficiency of different ricegenotypes was probed. The results of the study are as followed:P efficiency of rice depended on co-ordination of P absorption efficiency,utilization and translocation efficiency;The ricegenotypes with higher P uptake efficiency were characterized by more extensive root systems coupled with its higher total uptake area,active uptake area higher root activity and desirable kinetic parameters of P uptake,showing lower K_mand C_min,but longer I_maxvalues. However,the characteristics were different amonggenotypes. In this experiment,the higher P uptake efficiency of Tiyou 418 depended on more extensive root systems and longer I_maxvalue. But the higher P uptake efficiency of Liaoyou 1025 mainly resulted from larger total uptake area,active uptake area and higher root activity.

Key words: Rice, Genotypes, Difference, Mechanism

CLC Number: 

• S511. 01

• S143. 2