Studies on heterosis and combining ability in rice (Oryza sativa L.)

Abstract

Hybrid vigour and combining ability of two lines, 25 testers and their 50 hybrids was studied for grain yield, yield components and quality parameters during Rabi 2017-18. A perusal of the results revealed that the expression of heterosis was maximum over mid-parent for grain yield plant-1 and number of grains panicle-1 (>90%). Grain yield plant-1 and number of grains panicle-1 had also recorded high levels of heterosis over better parent (>70%). Standard heterosis more than 50 per cent was also recorded for grain yield plant-1 and number of grains panicle-1 over both varietal and the hybrid check. Further, combining ability analysis revealed pre-ponderant non-additive gene action for all the traits studied.

Heterosis and Combining ability Estimates using Line x Tester Analysis to Develop Wide Compatibility and Restorer Lines in Rice

“…Highly significant positive estimates of standard heterosis were observed in the crosses Norti X Nekken 1 (24.09) and Norti X Giza 178 (17.97). These results agreed with the data reported by Yuga et al, (2018), Prasad et al, (2019), Singh et al, (2019), Alok and Sujeet (2020), Kumar et al, (2020 b) and Yadav et al, (2020). The relationship between per se performance and genetic components :…”

“…Number of spikelets per panicle is one of the main important yield components that improve grain yield. The previous data agreed with the data reported by Kostylev et al, (2017), Prasad et al, (2019), Singh et al, (2019 and Yadav et al, (2020).…”

“…Awad-Allah (2019) found that the crosses between indica and japonica subspecies (I X J and J X I) where one of the parents is wide combatable lines showed the highest values of grain yield more than the crosses of the same subspecies (I X I). These results were in harmony with that reported by Prasad et al, (2019).…”

“…The cross Norti X Nekken 1 showed the highest estimates (43.88 and 54.50 %) of BP and MP heterosis, while the cross O2428-P-7-7 X IR 25571-31-1 (21.06) showed highly significant positive value of SH heterosis. Similar results were reported by Yuga et al, (2018), Prasad et al, (2019), Singh et al, (2019 and Kumar et al, (2020 b).…”

“…The crosses which have better per se performance and involved parents high × high as well as high × average, high × low and low × high GCA effects showed highest values of heterosis over better parent and heterosis over mid-parent for grain yield. Similar results were obtained by Prasad et al, (2019) and Kumar et al, (2020 a).…”