Abstract
Anther indehiscence in certain wide crosses combines male sterility with stigma exertion, a phenomenon that is desirable for hybrid rice seed production. This study sought to identify chromosomal region(s) that combine anther indehiscence with exerted stigmas. A mapping population consisting of 189 BC1F1 plants was derived from a cross between CRI-48 and Jasmine 85 and backcrossing the resulting F1 to Jasmine 85. Contrary to the three complementary genes mode of inheritance reported earlier, a single locus (AI6-1) was mapped on chromosome 6 at 27.4 cM for anther indehiscence with exerted stigmas through a mixed model-based composite interval mapping (MCIM). This locus was flanked by two single nucleotide polymorphism (SNP) markers, K_ID6002884 and K_ID6003341 within a range of 23.1–28.9 cM. The allele at the locus was contributed by the CRI-48 parent which has Oryza glaberrima ancestry. This locus is suggested to control anther indehiscence and stigma exertion through pleiotropic gene action or cluster of genes.
Highlights
Rice (Oryza sativa L.) is a major staple food crop in the developing world (Guimaraes, 2009; Seck et al, 2012)
The BC1F1 plants segregated for anther dehiscence/indehiscence and stigma exertion/non-exertion
Whereas Jasmine 85 flowered within 85 days, CRI-48 flowered at 70 days
Summary
Rice (Oryza sativa L.) is a major staple food crop in the developing world (Guimaraes, 2009; Seck et al, 2012). It is cultivated on 11% (156 million ha) of the world's total arable land second only to wheat in terms of harvested area (FAO, 2017). Genetic improvement of rice has led to significant yield increases; average yields of inbred varieties have reached a plateau making further increments difficult (Khush, 2005; IRRI, 2010; Khan et al, 2015). Hybrid technology which exploits the phenomenon of heterosis presents a viable means of significantly increasing rice yield than the semi-dwarf inbred varieties currently being utilised (IRRI 1997; Guimaraes, 2009; Fischer et al, 2014; Khan et al, 2015)
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