NGHIÊN CỨU VÀ KHAI THÁC HOẠT TÍNH ĐỐI KHÁNG Ở LÚA TRONG CÔNG TÁC PHÒNG TRỪ CỎ DẠI TRÊN ĐỒNG RUỘNG

Allelopathy can simply be understood as the ability of plants to inhibit or stimulate growth of other plants in the environment by exuding chemicals. In attempts to control weeds in rice, much effort has been focused on rice allelopathy research for more than 40 years. Among screening methods that have been developed, some estimate the allelopathic potential of various rice cultivars in a limited time and space, which is less costly and can be conducted year round. Rice allelopathy activity is variety dependent and origin dependent, where Japonica rice shows greater allelopathic activity than Indica and Japonica-Indica hybrids. Allelopathic characteristics in rice are quantitatively inherited and several allelopathy-involved traits have been identified. Numerous phytotoxins such as cytokinins, diterpenoids, fatty acids, flavones, momilactones, phenols, phenolic acids, have been identified and determined as growth inhibitors in rice. Success in breeding new rice cultivars having good weed-suppressing ability would benefit farmers in rice-cultivating countries and play an important role in sustainable agricultural production.