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Introgression of Yield Component Traits in Rice ( Oryza sativa ssp. indica ) through Interspecific Hybridization
Author(s) -
Bhatia Dharminder,
Joshi Shailesh,
Das Aparna,
Vikal Yogesh,
Sahi Gurpreet Kaur,
Neelam Kumari,
Kaur Karminderbir,
Singh Kuldeep
Publication year - 2017
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2015.11.0693
Subject(s) - biology , oryza sativa , backcrossing , introgression , oryza rufipogon , panicle , oryza , randomized block design , agronomy , hybrid , horticulture , botany , gene , genetics
Considering the potentials of wild rice ( Oryza spp.), as well as the need to enhance the yield potential of rice and to increase rice production to meet increasing demands, 1780 backcross inbred lines (BILs) were generated by crossing 70 accessions of six “AA” genome species: Oryza glaberrima Steud., Oryza barthii A. Chev., Oryza nivara Sharma & Shastry, Oryza rufipogon Griff., Oryza longistaminata A. Chev. & Roehr., and Oryza glumaepatula Steud. with two elite cultivars of Oryza sativa L. The wild species accessions were selected based on variation at the DNA markers and agromorphological traits. The BILs were generated by backcrossing F 1 s twice (thrice in some cases) to recipient parents, followed by continuous selfing and selection for the yield and yield component traits. The set of 1780 BC 2 F 5 to BC 2 F 10 BILs were evaluated in an augmented design over 3 yr. Based on ANOVA in augmented design, 108 agronomically superior BILs were selected and evaluated in randomized complete block design. Of the 108 BILs evaluated, 15 BILs showed >10% yield superiority over the recurrent parent, with spikelet per panicle and thousand‐grain weight as most significant traits contributing to yield increase. Based on the contribution of donor accessions for the improvement of yield component traits, six accessions of O. glaberrima , one of O. barthii , two of O. nivara , two of O. rufipogon , and one each of O. longistaminata and O. glumaepatula were identified as potential donors that could be used more rigorously in transferring genes to cultivated rice. The BILs generated in the present study represents a reservoir of novel genetic variation.