Parent progeny regression analysis in segregating generations of drought QTLs pyramided rice lines (Oryza sativa L.)

Abstract

The present study was undertaken to estimate the effectiveness of selection for the yield and yield contributing traits in the BC 2 F 3 and BC 2 F 4 generations of drought QTL introgressed progenies of Improved White Ponni (IWP) x Apo. A positively skewed and negatively skewed platykurtic curve was observed in many of the traits in both generations indicating the influence of a large number of genes. Significant and positive intergenerational correlation and regression coefficient values were obtained for all the yield contributing characters indicating that selection can be done in these generations for isolating superior genotypes. Narrow sense heritability estimates obtained high values for the traits days to 50 per cent flowering, the number of productive tillers, filled grains per panicle and single plant yield indicating that selection will be effective for these traits in these early generations.

Marker assisted pyramiding of qDTY QTLs governing yield under drought stress into rice variety ADT(R)45

“…Mean panicle length of BILs were higher than ADT(R)45 and lesser than the donor parents. Similar intermediate mean values of panicle length for drought introgressed progenies were reported by Prisca Seeli et al (2021). It may be due to the incomplete dominance of the alleles for this trait.…”

Harnessing parent-offspring regression analysis to develop high-yielding submergence tolerant lines of Oryza sativa L.

“…The maximum regression coefficient was observed for spikelet fertility (1.01) followed by filled grains per panicle (0.99), total grains per panicle (0.99), single plant yield (0.98), number of productive tillers per plant (0.97), flag leaf length (0.90), days to fifty percent flowering (0.87), panicle length (0.64) and stem diameter (0.57) indicating that selection of these traits at the early generation helps in obtaining plants with higher yield and good agronomic performance (Table 4). Similar findings were made regarding all yield contributing traits in drought study by Seeli et al (2021), Blessy et al (2022), single plant yield by Anilkumar and Ramalingam (2011), days to 50% flowering, plant height, and the number of productive tillers by Kavithamani et al (2013), and panicle length by Lalitha et al (2018). Greater genetic influence and fewer environmental influences are indicated by higher regression values (Palanisamy, 2018).…”

“…Similar positive and significant results for plant height, the number of filled grains per panicle, hundred grain weight and panicle length were obtained bySeeli et al (2021). Number of productive tillers, panicle length and single plant yield byGovintharaj et al (2018).…”

“…Hosagoudar and Shashidhar (2018) and Harijan et al (2021) found similar results for days to flowering, the number of tillers, days to maturity, and yield per plant. Also days to fifty percent flowering and chaffy grains per panicle by Seeli et al (2021) The negatively skewed and platykurtic curve was observed for stem diameter and spikelet fertility in both BC 2 F 4 and BC 2 F 5 generation. Many genes with duplicate gene action are responsible for these traits.…”

“…Kavithamani et al (2013). Maximum heritability for days to fifty percent flowering was observed by Seeli et al (2021) and Blessy et al (2022).…”