Infusing genetic variability for productivity and drought tolerance traits from Brassica carinata into Brassica juncea genotypes.

Autor: Limbalkar, Omkar Maharudra, Vasisth, Prashant, Singh, Rajendra, Rao, Mahesh, Singh, Guman, Singh, Lal, Dhanasekaran, Gokulan, Kumar, Manish, Meena, Mohan Lal, Joghee, Nanjundan, Parihar, Chiter Mal, Chinnusamy, Viswanathan, Singh, Kunwar Harendra, Singh, Naveen
Zdroj: Genetic Resources & Crop Evolution; Dec2024, Vol. 71 Issue 8, p4603-4629, 27p
Abstrakt: Brassica carinata is known to tolerate most of the biotic and abiotic stresses. Development of B. carinata-derived introgression lines (ILs) in the nuclear background of B. juncea, is likely to create enormous genetic variability for drought tolerance. The present study was, therefore, conducted to develop B. carinata-derived introgression lines (ILs) and characterize the genetic variability in a set of 191 ILs developed in the background of DRMRIJ 31, Pusa Mustard 30 and Pusa Agrani under both rainfed and irrigated conditions. Analysis of variance on fifteen seed yield contributing and three physiological traits displayed sufficient phenotypic variability among ILs under rainfed and irrigated conditions. Introgression lines exhibited higher or equivalent mean values for harvest index, 1000-seed weight, chlorophyll content, canopy temperature depression and leaf area index traits under rainfed conditions than in irrigated conditions. High heritability (> 60%), genotypic and phenotypic coefficient of variation (> 20%) and genetic advance as a percent of mean (> 20%) were observed for secondary branches/plants, seed yield/plant, biological yield/plant and seed yield/plot traits under both water regimes. Under moisture deficit stress conditions seed yield/plant, harvest index, 1000 seed weight and oil content had significant association and higher direct effects on seed yield/plot. Twenty-eight ILs identified to be highly productive and water use efficient, can be utilized for improving the seed yield of Indian mustard in water-scarce regions. The study demonstrates the significance of B. carinata in creating novel genetic variability for improving seed yield traits and drought tolerance in the Indian mustard. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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