低钾胁迫对水稻苗期矿质营养吸收和植物激素含量的影响
- 1. 湖南农业大学植物激素与生长发育湖南省重点实验室,湖南长沙410128;
- 2. 湖南城市学院计算机科学系,湖南益阳413000
- 收稿日期:
2007-12-19
- 网络出版日期:
2009-01-25
摘要: 以水稻（Oryza sativa L.）受体N27（对照）和来源于N27的耐低钾基因型水稻N18和N19为材料。采用溶液培养技术研究了低钾胁迫对其苗期矿质营养吸收和叶片植物激素含量的影响。结果表明，在低钾胁迫下，水稻幼苗吸钾效率和钾利用效率以及植株钾转运率降低，但N18、N19的降低幅度小于N27。同时，低钾胁迫下N18和N19与N27相比具有较强吸收和运输钠、磷、镁、铁和钙的能力。低钾胁迫使水稻叶片IAA、GA1和ZR的含量以及IAA/ABA、ZR/ABA和GA1/ABA比值均降低，N18、N19的降低幅度小于N27，且具有较高的IAA、GA1和ZR的含量以及IAA/ABA、ZR/ABA和GA1/ABA比值；低钾胁迫下N18、N19叶ABA的含量增加幅度小于N27。水稻耐低钾特性与其矿质营养吸收能力和植物激素水平或植物激素间比例关系有关。
Effects of low potassium stress on mineral nutrient absorption and phytohormone contents of rice seedling
- 1. Hunan Provincial Key Laboratory of Phytohormones and Growth Development,Hunan Agricultural University,Changsha 410128,China;
- 2. Department of Computer Science,Hunan City College,Yiyang 413000,China
- Received Date:
2007-12-19
- Available Online:
2009-01-25
Abstract: Two low potassium tolerant rice (Oryza sativa L.) genotypes, N18 and N19, and their recipient, N27(control) were used to investigate the effects of low potassium stress on mineral nutrient absorption and phytohormone contents of leaves of rice at the seedling stage using a solution cultivation experiment. The results show that potassium uptake efficiency, potassium utilization efficiency and potassium translocation rate of the 3 genotypes were decreased under the low potassium stress. The decreased values of N18 and N19 are less than those of N27. Furthermore, under low potassium stress, absorption abilities and translocation abilities of Na, P, Mg, Fe and Ca of N18 and N19 are stronger than those of N27. Under low potassium stress, IAA, GA1 and ZR contents of leaves for all genotypes are decreased, and as well as the ratios of IAA/ABA, ZR/ABA and GA1/ABA. The reduced amounts of IAA, GA1 and ZR of N18 and N19 are less than those of N27. While ABA contents are increased, the increased amounts of N18 and N19 are less than that of N27. These results indicate that the characteristics of rice resistance to low potassium stress are related to their abilities to absorb mineral nutrients and the contents of phytohormones.
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