Title: Evaluation of Allelopathic Potential of Some Chinese Rice Against Weeds
Abstract: Experiments were conducted in the plant growth chamber and paddy field respectively. Two rice varieties (Oryza sativa L.) with allelopathic property against a barnyardgrass \[Echinochloa crusgalli (L.) Beauv. var. mitis (Pursh) Peterm\] were obtained after evaluating more than 470 rice accessions of rice germplasm provided by China National Rice Research Institute. One is I Kung Pao, a Taiwan native variety, with its R RL (relative factor of the barnyardgrass root length) 0 43. The leaves water extract of I Kung Pao inhibited barnyardgrass root length by 45% and lettuce root length by 85% , respectively. In paddy field I Kung Pao showed inhibitory effect on the barnyardgrass plant density by 22.0% and reduced the plant fresh weight by 26.1%. The other is D gu, a variety from Yunnan, with its R SH (relative factor of the barnyardgrass plant height) 0.62 and R PDW (relative factor of the barnyardgrass plant dry weight) 0.58. The root length control effects were 53% for the barnyardgrass and 65% for the lettuce after treated with D gu leaves water extract. In paddy field D gu markedly controlled the barnyardgrass plant density by 51.5% and the plant fresh weight by 46.1%. The lettuce root length control effect resulted from I Kung Pao and the barnyardgrass control effect from D gu were significantly greater than those from American allelopathic rice PI312777. I Kung Pao and D gu are valuable rice germplasm with allelopathic potential in China.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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Cited By Count: 4
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