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- Title
Deciphering the genetic architecture of plant height and main shoot length in backcross introgression lines of Sinapis alba + Brassica juncea allohexaploids.
- Authors
Kumari, Preetesh; Singh, Kaushal Pratap; Rai, Pramod Kumar
- Abstract
Plant height (PH) and main shoot length (MSL) are multi-allelic quantitative traits, that exert profound influences on crop productivity. The identification of QTLs responsible for PH and MSL is important for enhancing crop yield potential. To achieve this, we constructed a genetic linkage map using 192 SSRs in combination with 94 BCILs derived from JS1 and JS2 somatic hybrids. This comprehensive map spanned a total length of 1420.69 cM, expanding into 12 linkage groups. For PH, we identified a total of seven and one QTLs across two successive crop seasons. Interestingly, the minor QTLs identified during the first season exhibited relatively modest phenotypic effects (2.43–7.33%) while a dominant QTL (12.88% PVE) was identified in the subsequent crop season. All these QTLs displayed positive and negative additive effects, often accompanied by exceptionally high dominance effects (≤ 39.06). For MSL, we detected three QTLs during the first crop season, characterized by LOD values of 3.0063, 3.3156, and 8.9608, explaining 5.61%, 6.17%, and 16.27% PVE, respectively. Subsequently, two QTLs were identified on LG-2 with LOD values of 2.5869 (13.79% PVE) and 3.5740 (7.93% PVE), revealing negative additive effects. In the QTL regions for PH and MSL, we discovered a total of 20 genes, with eight and twelve genes associated with auxin and Brassinosteroids genes, displaying essential roles in regulating shoot height. In this pioneering study, we present the first-ever report detailing the identification of PH and MSL genes contributed by S. alba creating linkage drags in advanced BCILs and providing an opportunity for Brassica crop improvement.
- Subjects
BRASSICA juncea; GROWING season; SOMATIC hybrids; INTROGRESSION (Genetics); CROP improvement; CROP yields
- Publication
Euphytica, 2024, Vol 220, Issue 1, p1
- ISSN
0014-2336
- Publication type
Article
- DOI
10.1007/s10681-023-03271-5