2010•Journal of Yangzhou UniversityRequires access

Disease resistance evaluation to sheath blight of commercialized japonica rice cultivars around tenth five-year plan in Jiangsu province.

Zongxiang Chen, Zuo ShiMin, Wang Longping, Zhu JunKai, Zhang Ya-fang, Hui Wang, MA Yu-yin, Xuebiao Pan

Abstract

Sheath blight(SB) resistance of 64 commercialized japonica rice cultivars around Tenth Five-year Plan in Jiangsu Province were evaluated by using artificial inoculation in a two-year test.The consistent trend of SB development and severity within tested cultivars were found between years and between replications in each year.Totally,the cultivars with shorter whole-growth-stage(Zhong-Shu Zhong-Jing-Dao) had lowest resistance,and the cultivars with longer whole-growth-stage (Zao-Zhong-shu Wan-Jing-Dao) showed relatively higher SB resistance than that of medium whole-growth-stage(Chi-Shu Zhong-Jing-Dao).In a '0-9' rating scale system,no cultivars reached resistant and high resistant levels.Eight cultivars with moderate resistance level distributed in different whole-growth-stage groups.Furthermore,identifying methods and rating criterions in evaluation of SB resistance,and other problems associated with SB resistant breeding were discussed in this paper.

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Key concepts: Cultivar, Sheath blight, Japonica rice, Japonica, Inoculation, Horticulture, Biology, Resistance (ecology)