Effect of Sowing Date on Heterosis of Wheat Ecotypes Hybridization

doi:10.13560/j.cnki.biotech.bull.1985.2018-0683

Abstract

Abstract: In order to clarify the optimal sowing dates of different ecotype hybrids,3 sowing dates（October 2,2014,November 3,2014 and March 21,2015）were set up with 6 winter wheat and spring wheat parent materials and 8 hybrid combinations. The two-factor split design was used to study the heterosis changes of agronomic traits and yield by using strong heterosis combination. The results showed as such：All the ecotype hybrid combinations and their parents were able to overwinter normally,and the winter parents sown in spring was not heading. The differences of yield and agronomic traits under different sowing dates all reached the significant level. With the delay of sowing date,the yields of both hybrids and parents decreased significantly,the yields of hybrids decreased more than that of parents,the yield of spring parents decreased less than that of winter parents,and the yields of reciprocal combinations between winter and spring ones were not significant. Wheat ecotypes hybrids may demonstrate their high-yield potential during normal autumn sowing seasons. Four strong heterosis combinations were selected：Xinchun38×Xindong41,Xindong41×Xinchun38,Bachun 02-509×Xindong33,and Xindong33×Bachun02-509. Correlation analysis revealed the yield of strong heterosis combination community was in T1>T2>T3. Screening strong heterosis combination between winter wheat and spring wheat ecotypes can be conducted by adjusting the sowing dates to solve the problem of adaptability in winter and spring.

Key words: wheat, ecotype interbreeding, heterosis, sowing date

KONG De-zhen, NIE Ying-bin, XU Hong-jun, MU Pei-yuan, CUI Feng-juan, TIAN Xiao-ming, SANG Wei. Effect of Sowing Date on Heterosis of Wheat Ecotypes Hybridization[J]. Biotechnology Bulletin, 2019, 35(2): 23-28.

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