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Chinese Agricultural Science Bulletin ›› 2019, Vol. 35 ›› Issue (5): 1-6.doi: 10.11924/j.issn.1000-6850.casb18080123

Special Issue: 小麦 农业生态

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Pre-harvest Sprouting Resistance of Sichuan Wheat Varieties (Lines): An Evaluation

  

  • Received:2018-08-31 Revised:2019-01-14 Accepted:2018-10-25 Online:2019-02-13 Published:2019-02-13

Abstract: The pre-harvest sprouting controlled by growth environment, seed color and genetic gene, could seriously influence the yield and quality of wheat. Due to the high temperature and high humidity condition during the wheat harvest season, Sichuan is the frequent and severe occurrence area of pre-harvest sprouting. According to the pre-harvest sprouting resistance of the materials, the purposeful selection and preparation of hybrid combinations to breed resistant varieties is an important strategy to control the pre-harvest sprouting. And it is important to systematically identify the pre-harvest sprouting resistance of each excellent varieties and lines. This study investigated the filed frequency of pre- harvest sprouting of 242 varieties and lines, including approved wheat varieties in Sichuan since 2000 and regional tested in Sichuan from 2017 to 2018, which would become new varieties in recent years. It was found that there were 23 (9.5%) and 67 (27.7%) materials, respectively, which were likely to have strong pre- harvest sprouting resistance (pre- harvest sprouting rate less than 5%) and high pre-harvest sprouting resistance (between 5% and 15%). This provided references for parent selection of pre-harvest sprouting resistance breeding, and found the difference in the pre-harvest sprouting resistance of different materials: the varieties approved since 2000 < regional tested common wheat lines < early sowing early mature wheat lines < special purpose wheat lines. The pre-harvest sprouting resistance of the varieties would increase in the next few years. Seed color had strong influence on pre-harvest sprouting resistance. The darker the seed color, the stronger the resistance of the pre-harvest sprouting. However, there were still 3 white wheat materials‘( Chuanyu26’,‘Chuanfu9’and‘Chuanfu17’) which had strong pre-harvest sprouting resistance, and could be evidence for white seed wheat breeding of preharvest sprouting resistance. In addition, we found that the early sowing might increase the resistance of preharvest sprouting of wheat varieties in Sichuan.

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