低磷胁迫下不同磷效率水稻苗期根系的生理适应性研究

应用生态学报 ›› 2003, Vol. ›› Issue (1): 61-65.

低磷胁迫下不同磷效率水稻苗期根系的生理适应性研究

郭玉春, 林文雄, 石秋梅, 梁义元, 何华勤, 陈芳育

福建农林大学作物学院, 福州 350002

收稿日期:2002-09-19 修回日期:2002-11-08 出版日期:2003-01-15
通讯作者: 林文雄
基金资助:
国家自然科学基金项目(39970441);福建省科技厅百千万人才基金资助项目(99-Z-204).

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

GUO Yuchun, LIN Wenxiong, SHI Qiumei, LIANG Yiyuan, HE Huaqin, CHEN Fangyu

College of Crop Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China

Received:2002-09-19 Revised:2002-11-08 Online:2003-01-15

摘要/Abstract

摘要： 以P效率差异显著的IR74(P高效型)、IR71331(中间型)及IR71379(P低效型)等3个品种为供试材料,采用水培法研究了这3类水稻在低P胁迫下P的吸收、转运及利用效率等P效率差异的原因以及P吸收动力学特征参数、R/S、酸性磷酸酯酶(acidphosphoesterase,简称APase)与核糖核酸酶(ribonuclease,简称RNase)等表现.结果表明,在低P胁迫下,P效率的高低是由水稻对P的吸收率、转运率以及利用效率综合作用的结果,存在基因型差异,P高效基因型IR74和P效率中间型的IR71331具有高的P吸收率,而IR71379P的吸收率低.不同P效率水稻在低P胁迫下,其K_m、C_min、I_max、R/S与Apase相对活性等参数表现出基因型的差异,小的K_m和C_min,大的I_max和R/S及高的APase升幅是水稻对P胁迫的生理适应性特征,也是植株在低P胁迫下较为敏感生理指标.其中各类型水稻叶片中RNase活性在低P胁迫下均表现大幅度上升,在品种间无显著差异,说明该酶是逆境胁迫并非低P胁迫的特征反应.

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.

中图分类号:

S511

郭玉春, 林文雄, 石秋梅, 梁义元, 何华勤, 陈芳育. 低磷胁迫下不同磷效率水稻苗期根系的生理适应性研究[J]. 应用生态学报, 2003, (1): 61-65.

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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