Physiological adaptability of seeding rice genotypes with different P uptake effciency under low P-deficient stress

Abstract

Abstract: The genotypic differences in Puptake efficiency of three rice varieties (IR74, IR71331 and IR71379) were studied under the P-deficiency condition with hydroponics, and their adaptability to low phosphorus stress about physio-biochemical mechanisms was further studied. The results showed that rice genotypes tolerated low Pstress resulted from the co-ordination of Puptake efficiency, internal utilization efficiency and its translocation efficiency. The higher P-efficiency type IR74 and the middle type IR71331 had a higher Puptake efficiency. The rice genotype with higher P-efficiency was characterized by higher activity and desirable kinetic parameters of H₂PO₄^- uptake, showing lower K_m and C_min, but higher I_max values and relative APase activity,small amount of K_m and C_min. Moreover,under low Pstress, the activity of RN ase was about ten to fifteen times as high as that of the control (CK), but it had little genotypic differences.

Key words: Oryza sativa, Low phosphorus stress, Adaptive mechanism, biomass, soil sterilization, spruce, ectomycorrhizal colonization

CLC Number:

S511

GUO Yuchun, LIN Wenxiong, SHI Qiumei, LIANG Yiyuan, HE Huaqin, CHEN Fangyu. Physiological adaptability of seeding rice genotypes with different P uptake effciency under low P-deficient stress[J]. Chinese Journal of Applied Ecology, 2003, (1): 61-65.

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