Heading dates of 20 late season japonica rice cultivars native to the Taihu Lake region of China were investigated, and their basic vegetative growth (BVG), photoperiodsensitivity (PS) and temperaturesensitivity (TS) were analyzed under artificial shortday and natural longday conditions in Nanjing, as well as artificial high temperature and natural low temperature conditions in winter in Hainan. The results showed that all the cultivars had strong PS, and most of the cultivars had strong TS and short BVG. Regression analysis showed a significant correlation between heading date and PS, indicating PS was the main factor affecting heading date of late season japonica rice cultivars from the Taihu Lake region. Genetic analyses were conducted by using a set of heading date near isogenic lines as tester lines. All these japonica cultivars carried the dominant photoperiod sensitivity allele E1 and the dominant earlyheading gene Ef1. At the E2 and E3 loci, most of the late season japonica cultivars carried the photoperiod insensitivity alleles e2 and e3, but some carried the photoperiod sensitivity alleles E2 and E3 or E3t. At the Se1 locus, these late season japonica cultivars mainly carried recessive photoperiod insensitivity gene Se1e, others carried Se1n. In addition, some of the late season japonica cultivars carried the recessive allele hd2, inhibiting the expressions of E1 and Se-1.
ZHOU Zhen-Ling1, 2 , JIANG Ling1,Xu Da-Yong1, 2 , WEI Xiang-Jin1, LIU Xi1, LU Bai-Guan2, WAN Jian-Min1, 3 , *
. Genetic Analysis of Heading Date of Late Season Japonica Rice from Taihu Lake Region[J]. Chinese Journal OF Rice Science, 2011
, 25(4)
: 357
-364
.
DOI: 10.3969/j.issn.1001-7216.2011.04.003
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