Compatibility of DH (doubled haploid) lines from indica/japonica hybrid to indica and japonica

Zhang ZaiJun; Liang ChengYe; Zhu YingGuo

Acta Agronomica Sinica 31(4): 511-514

2005


Accession: 004083884

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Abstract
Twenty-four rice accessions selected randomly from two DH (doubled haploid) populations, which were derived from intersubspecific crosses Zhaiyeqing 8/Jingxi 17 and Pei' ai 64/02428, were crossed with four wide compatibility tester cultivars to investigate their wide compatibility. According to Virmani S S (1992), a DH line tested will be designated as wide compatible (WC) line if the spikelet fertility of its tested hybrid F1 is significantly higher than that of the indica/japonica F1 but similar to indica and japonica tester parents. A t test was used to compare the significance of differences in mean spikelet fertilities of the four test crosses for each DH lines and the control crosses and the parents. The results indicated that DH lines with wide compatibility appeared in the two DH populations, no matter whether their parents had wide compatibility or not. This suggested that the recombination between indica and japonica genes could lead to wide compatibility. Interestingly, the wide compatibility of DH line had no correlation with self pollination, seed setting percentage and seed threshing. Moreover, most of the DH lines with wide compatibility belonged to an intermediate type between indica and japonica identified by means of Cheng's morphological traits index method (1987). In addition, the restoring fertility ability to cytoplasmic male sterile was independent of wide compatibility in the DH lines.