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- Title
Seed Nutrient and Seed Hormonal Contents Underlying Anaerobic Germination Tolerance in Black Coloured Rice Landraces of Tamil Nadu.
- Authors
Vinitha, A.; Vijayalakshmi, D.; Ravichandran, V.; Parthipan, T.
- Abstract
Good seed germination is a prerequisite for direct-seeded rice cultivation to withstand anaerobic conditions. In transplanted rice cultivation, labor costs and huge water requirements are major constraints. To overcome these problems, development of rice landraces with anaerobic germination (AG) tolerance is mandatory. In this study, 107 rice genotypes were grouped into tolerance/susceptible based on germination percentage. Anaerobic germination tolerance was associated with better germinability and faster coleoptile elongation with higher seed water content. Principal component analysis and cluster analysis under anoxic conditions revealed Karuppukavuni and Kalanamak as the most tolerant genotypes, while TKM13 and Anna R4 as moderately tolerant genotypes among the 22 rice genotypes evaluated for seed and coleoptile traits. The analysis of seed nutrient content revealed that major nutrients like N, P, K and Ca decreased under anaerobic stress. In contrast, micronutrients such as Fe, Cu and B increased under stress. Hormonal analysis showed that seed IAA along with its co-factor element Zn decreased in the tolerant genotypes while GA and α-amylase activities were increased. The study identified the black colored rice Karuppukavuni and Kalanamak for anaerobic germination tolerance. The key traits underlying the tolerance in the black colored rice are better imbibition of seed water coupled with higher coleoptile length and lower IAA and higher GA contents.
- Subjects
TAMIL Nadu (India); RICE seeds; GERMINATION; RICE; SEEDS; PRINCIPAL components analysis; CLUSTER analysis (Statistics)
- Publication
Russian Journal of Plant Physiology, 2024, Vol 71, Issue 1, p1
- ISSN
1021-4437
- Publication type
Article
- DOI
10.1134/S1021443723601969