Abstract
BackgroundIn India majority of the cultivable land area is becoming nutrient deficient, thus the development of tolerant varieties that can sustain under various stresses is essential. Identification of vigorous and nutrient-use-efficient rice genotypes is required for future breeding programmes. Such donor genotypes are prerequisites to develop high yielding varieties that can survive and yield under both normal and adverse conditions. Seedling vigour is an important trait that helps in the early survival of crop in input-limited environments. Thus, the present study was aimed at characterizing rice wild introgression lines for seedling vigour index and yield under both low and normal recommended doses of phosphorous (P) conditions.MethodologiesA total of fifteen rice genotypes, including 12 wild introgression lines and 3 check varieties, were evaluated in randomized block design with three replications under both low and normal recommended doses of phosphorous for agronomic traits. The genotypes were also evaluated for seedling vigour indices on the 7th day and 14th day under laboratory conditions.ResultsThe study detected a significant difference for all the traits among genotypes grown under normal and low P conditions. Trait association revealed a significant correlation of single plant yield with fresh root weight and seedling vigour index 2 at 14 days after germination under normal P conditions. Similarly, under low P conditions, single plant yield exhibited a significant association with fresh root weight and fresh shoot weight at 7 days. Seedling vigour index 2 exhibited a significant positive correlation with fresh root weight and fresh shoot weight under normal and low P conditions. Further stress tolerance indices were estimated to detect the nutrient stress tolerance under low P conditions, and the study showed that Stress Tolerance Index (STI) and Geometric Mean Productivity (GMP) are the better indices and the genotypes NPS56-2, NPK55 were observed as tolerant. Similarly, the genotype R-58, and NDR-359 reported a less percentage of yield reduction and with moderate to high STI, GMP values indicates the stable yielding ability of these genotypes. The study concludes the potential of these cultivars for the simultaneous improvement of yield and seedling vigour traits in changing climatic conditions.
Published Version
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