不同化感潜力水稻化感效应与产量的关系

Relationship between allelopathic potential and grain yield of different allelopathic rice accessions

本研究探讨了连续3年5种不同化感潜力水稻田间抑草效应、产量及其之间相互关系。结果表明,不同种植时间,不同化感潜力水稻田间种植过程中伴生杂草总生物量以非化感水稻"Lemont"最大,化感水稻"PI-1"最小。化感潜力分析结果表明,不同化感潜力水稻以化感水稻"PI-1"化感抑草潜力最强,非化感水稻"Lemont"最弱。水稻产量分析结果表明,不除草条件下,不同种植时间均以化感水稻"PI-1"产量最高,非化感水稻"Lemont"产量最低。除草条件下,依然以化感水稻"PI-1"产量最高,化感水稻"IAC47"产量最小。杂草生物量、水稻化感潜力与水稻产量的相关性分析结果表明,不同化感潜力水稻产量的大小与田间杂草生物量存在极显著负相关,与化感潜力大小存在极显著正相关。

Using rice aUelopathy to control weeds in paddy fields is a sustainable bio-engineering technique of the 21st century. The main objective of the study was to analyze the relationship between rice allelopathic potential and its grain yield. To that end, 5 different allelopathic rice accessions （allelopathic rice of＂PI-1＂, ＂Taichung Native 1＂, ＂Azucena＂, ＂IAC47＂; non-altelopathic rice ＂Lemont＂） were analyzed for companion weed biomass and rice grain yield under field conditions in 2008-2010. The results indicated that weed biomass was the highest under non-allelopathic rice ＂Lemont＂ and the lowest under allelopathic rice ＂PI-1＂. Furthermore, aUelopathic rice ＂PI-1＂ had the highest and non-allelopathic ＂Lemont＂ had the lowest inhibitory effect on weed. Hence aUelopathic rice ＂PI-1＂ had the highest grain yield and the reverse was true in ＂Lemont＂ under non weeding treatment. Allelopathic rice ＂PI-1＂ also had the highest while ＂IAC47＂ had the lowest grain yield under weeding treatment. The correlation analysis on weed biomass, rice allelopathic potential and rice yield indicated that grain yields of different allelopathic rice accessions were significantly nega- tively correlated with weed biomass while significantly positively correlated with allelopathic potential. The results suggested that allelopathie rice ＂PI-I＂ had the highest inhibition effect on paddy field weeds, the reverse was true in the case of non-allelopathic ＂Lemont＂ in the comparison of 5 different allelopathic rice accessions. Without weeding treatment, ＂PI-1＂ grain yield also exceeded those of the other rice accessions. Thus rice accession ＂PI-1＂ was the strongest allelopathic accession with the highest grain yield among the 5 rice accessions, the reverse was true in the case of＂Lemont＂.