Abstract
Submergence stress due to flash floods reduces rice yield drastically in sensitive varieties. Maudamani is a high yielding popular rice variety but is highly susceptible to submergence stress. The selection of progenies carrying Sub1 and GW5 (wide-grain) enhanced the submergence stress tolerance and grain yield of theMaudamani variety by following the marker-assisted backcross breeding method. Foreground screening detected 14 BC1F1, 17 BC2F1, and 12 BC3F1 backcross progenies that carried the target QTLs for submergence tolerance and grain width. Background screening was performed in the progenies carrying the target QTL and enhanced the recovery of a recipient parent’s genome by upto 96.875% in the BC3 pyramided line. The BC3F1 plant containing the highest recipient parent genome content and the target QTLs was self-pollinated. In BC3F2 generation, the target QTLs the Sub1 and GW5 (wide-grain) alleles and recipient parent’s yield component QTL OsSPL14 were tracked for homozygous states in the progenies. Seven pyramided lines showed tolerance to submergence for 14 days and higher grain yield than both the parents. The pyramided lines were similar to the recipient parent for the majority of the studied morphological and quality traits. The pyramided lines are useful as cultivars and can serve as potential donors for transfer of Sub1, OsSPL14, Gn1a, GW5 (wide-grain), and SCM2 QTLs.
Highlights
Rice, the golden cereal, sustains life for millions of people around the world
We report here the successful development of pyramided lines in a Maudamani background carrying Sub1, OsSPL14, and GW5 QTLs in a homozygous state for submergence tolerance and high grain yield
The genetic basis of high yield was checked by validating the presence of QTLs contributing higher yield through Gn1a, OsSPL14, and SCM2 in the recipient parent Maudamani
Summary
The golden cereal, sustains life for millions of people around the world. The crop is very unique in its adaptation and cultivation from very high elevations to below sea level. The crop is cultivated as a rainfed crop in about 45% of the total rice cultivated area [1]. Rice crop provides livelihood to nearly 4 billion people, which constitutes about 55% of the global population. The crop generates about $206 billion global annual earnings, which is 17% of the total crop value [2]. The higher production from rainfed rice cultivation is challenged by the climate change-related yield-reducing factors in India [3]. About 22 mha of rainfed rice area is cultivated in India, of which 90% is confined to the eastern region of the country [4]. Submergence tolerance and high grain yield along with resistance to major diseases and insect pests should be transferred to a superior variety to ensure stable production
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