Higher relative humidity and more moderate temperatures increase the severity of rice false smut disease in the rice –crayfish coculture system

Rice false smut in rice –crayfish coculture (RC) was much more serious than the disease in rice monoculture (RM) among most rice varieties. Some varieties displayed resistance to rice false smut in RM, but were susceptible in RC, suggesting that the RC system is a better model than RM for evaluation of the resistance of rice varieties to false smut. In comparison with RM, RC showed higher relative humidity and more moderate temperatures from the rice booting stage to early filling stage. AbstractRice false smut, a devastating grain disease in rice, is a great challenge to global food security. Rice –crayfish coculture (RC) has been widely used in recent years because it increases farmers' income, stabilizes rice yield, and reduces the use of pesticides and chemical fertilizers. Currently, rice false smut is becoming a threat to the stability of RC systems. A field experiment demonstrated tha t rice false smut in RC was much more serious than the disease in rice monoculture (RM) among most rice varieties in both 2019 and 2020. The fold change (RC vs. RM) range of the disease index of different rice varieties ranged from 1.23 to 19.35. Some varieties displayed resistance to rice false smu t in RM, but were susceptible in RC, suggesting that the RC system that utilizes deep water irrigation is a better model than the RM to evaluate the resistance of rice varieties to false smut. Under the RC system, varieties YG 16, GBYJZ, and HD 5 displayed good natural resistance to rice f...

Source: Food and Energy Security - August 17, 2021 Category: Food Science Authors: Song Jiehui, Wang Yan, Chen Linrong, Zhang Sijie, Ni Chuan, Zhu Di, Liang You, Luo Junfei, Dou Zhi, Gao Hui, Dai Qigen, Xu Ke, Huo Zhongyang Tags: ORIGINAL ARTICLE Source Type: research