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Abstract
Allelopathy has been considered not only as an environmentally friendly approach for weed control but also a potential reason causing autotoxicity in crop production. In this study, the responses of seeds of lettuce, wheat, rice, clover broomrape (CB), and sunflower broomrape (SB) to the root exudates of rice cultivars were studied. Lettuce germination was promoted by root exudates of Yliangyou 3218 and I-Kung-Pao. Wheat seedling growth was inhibited by all nine rice species. I-Kung-Pao and Ganxin 203 exerted greater autotoxicity than other cultivars. Yongyou 15 and I-Kung-Pao induced the highest germination rate of CB, while Yongyou 13, Zhongzao 22, and I-Kung-Pao induced the highest germination rate of SB. A significantly correlation was noted between germination-inducing ability on broomrape seeds and allelopathic effects on target plants. It is suggested that using broomrape seeds germination is a better receptor for the identification of rice allelopathic potential.
Acknowledgments
The authors thank the National Science and Technology Support Program [2011BAD31B05] for the financial support of this work. We thank Prof. A. Egrinya Eneji of the University of Calabar, Nigeria, and visiting professor at the State Key Laboratory of Soil Erosion and Dry Land Farming on Loess Plateau and also an American scientist Dr. Jeff Gale, present working at Shihezi University of China for critical reading and editing of the manuscript. The authors also thank the anonymous reviewers of this paper for their useful suggestions.
