首页|期刊导航|中国农业科学（英文版）|Evaluation on Chinese Bread Wheat Landraces for Low pH and Aluminum Tolerance Using Hydroponic Screening
中国农业科学（英文版）2009，Vol.8Issue(3)：285-292,8.
Evaluation on Chinese Bread Wheat Landraces for Low pH and Aluminum Tolerance Using Hydroponic Screening
Evaluation on Chinese Bread Wheat Landraces for Low pH and Aluminum Tolerance Using Hydroponic Screening
摘要
Abstract
Aluminum (A1) toxicity often takes place in acidic soils with a pH of 5.5 or lower. Breeding and cultivation of A1 tolerance wheat can partially protect wheat escaping from AI toxicity. The scarcity of the tolerant sources impedes the wheat breeding.In order to find new AI tolerance sources, we screened 173 bread wheat landraces from Tibet of China using hydroponic screening. It was indicated that: (1) There were diversities on the root regenerate length (RRL). The RRL of a large of landraces were longer than 7.00 cm in pH 7 (58.38%) and pH 4.5 (66.47%), but shorter than 5.00 cm in pH 4.5 +50 μM Al3+(80.93%). The low pH showed either promotion or restraining effects depend on landraces, but AI toxicity under low pH only showed restraining effects on the root elongation. (2) There were also diversities on root tolerance index of low pH (RTI 1) or root aluminum tolerance index (RTI2) among cultivars. The RTI1 varied from a narrow range but with relatively high value (0.8722-1.2953) in comparison with that of RTI2 (0.3829-1.0058), and the RTI1 of approximately 60% landraces was higher than 1.0000, the RTI2 of only 19.07% landraces was higher than 0.7000, suggesting that A1 toxicity acted as an important factor for the reduction of the root elongation under acidic soils. (3) The RTI 1 of many wheats was higher than 1.0000, and As2256 and As2295 were the most tolerant for low pH, with RTI1 1.2953 and 1.2925, respectively. (4) Based on RTI2, seven wheats showed similar or higher tolerance to AI toxicity than Chinese Spring (CS), a known tolerance wheat. Much better tolerance existed in landraces of As1543 and As1242, which can be used as the new parents for AI tolerant breeding.关键词
bread wheat/root regenerate length/tolerance index/aluminum tolerance/hydroponic screeningKey words
bread wheat/root regenerate length/tolerance index/aluminum tolerance/hydroponic screening分类
农业科技引用本文复制引用
DAI Shou-fen,YAN Ze-hong,LIU Deng-cai,ZHANG Lian-quan,WEI Yu-ming,ZHENG You-liang..Evaluation on Chinese Bread Wheat Landraces for Low pH and Aluminum Tolerance Using Hydroponic Screening[J].中国农业科学（英文版）,2009,8(3):285-292,8.基金项目
This work was supported by the program for the New Century Excellent Talents in University of China (NCET- 06-0819), the National Natural Science Foundation of China (30671272 & 30370882), the Foundation for the Author of National Excellent Doctoral Dissertation of China (200458), the National High Technology Research and Development Program of China (863 Program, 2006AA 10Z 179, 2006AA10Z1F8), and the Scientific Research Fund of Sichuan Provincial Education Department, China. （NCET- 06-0819）
