TITLE:
Utilizing Dominant Early Maturity Genes of Sterile Line UP-3s in Hybrid Rice Breeding to Avoid High Temperature Season
AUTHORS:
Bihu Huang, Zongbu Yan
KEYWORDS:
Earlier Maturity, Dominant Gene, Sterile Line, Hybrid Rice, Utilization, Breeding, Avoid, High Temperature
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.6 No.16,
October
23,
2015
ABSTRACT: A new sterile line UP-3s, which carries the Dominant Early Maturity Gene (DEMG), was bred on
the farm of University of Arkansas at Pine Bluff (UAPB). UP-3s and two check sterile lines, Jin23-A
and Xie-A which do not carry the Dominant Early Maturity Gene, were crossed with a group of
different maturity restorer lines, PB-1R, PB-5R，PB11, PB-13R, PB-20, PB-21, PB-22R, and PB-23R.
Eighteen new hybrid rice combinations of these crosses were then tested at UAPB in 2012 and
2013. The results showed that panicle differentiation (PD) of hybrids from female parent UP-3s
(DEMG) crossed with the 8 male parents, were earlier than the hybrids from female parent
Jin23-A or Xie-A crossed with the 8 male parents. The PD of these earlier hybrids was before Jun
25 and heading was before July 20. Early PD and heading avoided the high temperature (over
34°C) period which usually occurs after July 20 in Arkansas. The yields of these earlier maturity
hybrids with female parent UP-3s were higher than those of the late maturity hybrids thatwereF1
progeny of sterile lines Jin23-A or Xie-A (these two female parent checks with non-DEMG). These
results showed that the DEMG sterile line UP-3s can be adopted in making crosses with later maturity
restorer lines to obtain earlier maturity hybrids to avoid the high temperature period in
Arkansas.