title: [Allelopathic potential and physiological mechanism of Oryza sativa L. under phosphorus deficiency stress].
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 x 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 by 20.19%, 15.47% and 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.
authors.affiliation: Key Laboratory of Pesticide and Chemical Biology of Education Ministry, College of Life Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China. hehq1968@yahoo.com.cn
authors.forename: Huaqin
authors.initials: H
authors.lastname: He
authors.forename: Yiyuan
authors.initials: Y
authors.lastname: Liang
authors.forename: Lujie
authors.initials: L
authors.lastname: Chen
authors.forename: Chongguang
authors.initials: C
authors.lastname: Zhuang
authors.forename: Yuqin
authors.initials: Y
authors.lastname: Ke
authors.forename: Kangjing
authors.initials: K
authors.lastname: Liang
authors.forename: Wenxiong
authors.initials: W
authors.lastname: Lin
mesh_terms: D031747:Echinochloa / Q000254:growth & development*; D012275:Oryza / Q000378:metabolism / Q000502:physiology*; D010675:Pheromones / Q000502:physiology*; D010758:Phosphorus / Q000494:pharmacology*
chemical_list: D010675:Pheromones; D010758:Phosphorus