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低磷营养胁迫下水稻化感抑草潜力的变化特性及其作用机理

何华勤;梁义元;陈露洁;庄重光;柯玉琴;梁康迳;林文雄   

  1. 福建农林大学生命科学学院农药与化学生物学教育部重点实验室, 福州 350002
  • 收稿日期:2005-10-19 修回日期:2006-09-13 出版日期:2006-11-18 发布日期:2006-11-18

Allelopathic potential and physiological mechanism of Oryza sativa L. under phosphorus deficiency stress

HE Huaqin; LIANG Yiyuan; CHEN Lujie; ZHUANG Chongguang; KE Yuqin; LIANG Kangjing; LIN Wenxiong   

  1. Key Laboratory of Pesticide and Chemical Biology of Education Ministry, College of Life Science,
    Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2005-10-19 Revised:2006-09-13 Online:2006-11-18 Published:2006-11-18

摘要: 在低磷(0.5 mg·L-1) 营养胁迫下,运用生理生化方法分析了化感水稻PI312777(PI)与非化感水稻Lemont (Le) 对稗草抑制作用潜力的变化特性及其内在机理.结果表明,在低磷营养胁迫下,化感水稻品种PI对受体稗草根干重的抑制能力明显提高,在处理后的5 、10和15 d,其对稗草地下部干重的抑制率分别增加了5.64%、3.89%和12.13%,增加幅度比非化感水稻品种Le显著.生理生化分析结果表明,与正常营养条件相比,用低磷营养下生长的化感水稻PI的根系分泌物处理稗草5、10和15 d,受体稗草叶片中POD活性的促进率分别提高了20.19%、15.47%和6.68%,吲哚乙酸氧化酶活性的促进率分别提高了18.08%、17.71%和12.50%,硝酸还原酶活性的抑制率分别增加了13.89%、18.60%和2.10%. 在低磷营养胁迫下,化感水稻通过抑制受体植物的硝酸还原酶活性,影响其对氮营养的吸收,同时显著提高了吲哚乙酸氧化酶活性,减缓了受体稗草的生长速度,提高了其抑草作用潜力.

Abstract: In this paper, allelopathic rice PI312777 (PI) and non-allelopahtic rice Lemont(Le) were grown in the nutrient solution with two levels of phosphorus (P) supply, and their allelopathic effects on Echinochloa crus-galli L. were studied. The results showed that under phosphorous deficiency stress, the inhibitory effect of PI on E. crus-galli root growth had an obvious increase. After growing in the nutrient solution with low P supply (0.5 mg·L-1) for 5, 10 and 15 days, the inhibitory rate of PI on E. crus-galli root dry matter increased by 5.64%, 3.89% and 12.13%, respectively, while that of Le did not show the same trend, compared with normal P supply. With low P supply for 5, 10 and 15 days, PI allelopathic effect on the leaf POD activity of E. crus-galli increased by20.19%, 15.47and 6.68%, IAAoase activity increased by 18.08%, 17.71% and 12.50%, while NR activity increased by 13.89%, 18.60% and 2.10%, respectively, suggesting that under P deficiency, PI enhanced its allelopathic potential through two pathways, i . e ., to increase the weed POD and IAAoase activities to slow down its growth rate, and to decrease the weed NR activity to affect its N uptake.

Key words: Fusarium 9568D, Abiotic Dracaena cochinchinensis, Blood resin