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- Title
Accelerated mustard [Brassica juncea (L.) Czern & Coss] improvement for salt tolerance: Photosynthetic traits and selection indices.
- Authors
Singh, Jogendra; Singh, Vijayata; K. T., Ravi Kiran; Kumar, Ashwani; Khan, Mudasser Ahmad; Khatik, Champa Lal; Jakhar, Mohan Lal; Sheera, Ashish; Meena, Prabhu Dayal; Yadava, Devendra Kumar; Sharma, Parbodh Chander
- Abstract
Photosynthetic traits can sense and signal abiotic stress at early growth stages of mustard [Brassica juncea (L.) Czern & Coss]. The integration stress responses with multiple selection indices can select the fittest/tolerant genotypes. With this goal, a set of 210 diverse mustard genotypes were phenotyped under control and salt-stress (electrical conductivity = 12 dS m−1). Significant dynamic response of the plant to salt stress with reduction for all morpho-physiological traits and genotype × treatment interaction was observed under salinity. A higher accumulation of Na+ was recorded in the roots, followed by shoots. A close correspondence between phenotypic coefficient of variation and genotypic coefficient of variation under control and salt stress conditions results in high heritability (h2) in broad sense. A significant negative association between shoot and root Na+ content and rate of photosynthesis also indicated that Na+ was significantly restricted in the root. This was not found to be efficient because considerable Na+ buildup was observed in the shoot. Multiple trait-based indices, such as membership function value of salinity tolerance, classical Smith–Hazel index, factor analysis ideotype–best linear unbiased prediction index, and multi-trait genotype-ideotype distance index, deduced CS 2009-159, CS 2009-420, CS 2009-124, and Swarn Jyoti (RH-9801) are promising for identifying salt-tolerant genotypes that can serve as donors for the development of salt-tolerant cultivars.
- Subjects
PHOTOSYNTHETIC rates; ELECTRIC conductivity; MEMBERSHIP functions (Fuzzy logic); PHENOTYPIC plasticity; ABIOTIC stress; BRASSICA juncea
- Publication
Agronomy Journal, 2024, Vol 116, Issue 5, p2458
- ISSN
0002-1962
- Publication type
Article
- DOI
10.1002/agj2.21663