Improvement Effects of Different Donor and Back-cross Times on Combining Ability and Heterosis of Inbred Lines in Maize

doi:10.7668/hbnxb.20191611

Abstract

Abstract: Studying the improvements of different donors and different back-cross times plays an important role in maize back-cross breeding. 36 back-cross improved lines were obtained by backcrossing 0-5 times and selfing 8-3 times,using maize inbred lines K11 and K62 as recurrent parents and three inbred lines as donor parents respectively. The 3×38 incomplete two-row hybrid model was used to analyze the combining ability and heterosis performance of main traits in back-cross improved lines.Donors A3 and B1 performed better than the other 4 donor parents on improving GCA,SCA and heterosis of yield,indicating that different donors presented different effects on improving the combining ability of different traits;In terms of the back-cross time,the improvement of 0-5 back-crosses on the GCA and SCA of yield was not obvious,0 and 1 back-cross performed better on improving the heterosis of yield.Choosing an appropriate donor parent was of vital importance when using back-cross to improve the quality of maize inbred lines,and the back-cross time should not exceed twice in back-cross breeding process;The GCA of yield of 10 improved lines,such as A3-1 and B1-1,were significantly higher than corresponding recurrent parents,which presented excellent potential of high-yield breeding.

Key words: Mazie, Inbred line, Back-cross, Combining ability, Heterosis

CLC Number:

S513.03

ZHAO Changyun, SHI Haichun, XIA Wei, CAI Lin, YANG Shu, YU Xuejie, KE Yongpei. Improvement Effects of Different Donor and Back-cross Times on Combining Ability and Heterosis of Inbred Lines in Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(S1): 56-62. doi: 10.7668/hbnxb.20191611.

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