Ecology, Environment and Conservation Paper

Vol 22, Sept. Suppl. Issue , 2016; Page No.(229-234)

STUDY OF SELECTION GAIN FOR HIGH YIELD IN EARLY SEGREGATING GENERATIONS OF RICE CROSSES (ORYZA SATIVA L.)

P. Mahesh Babu, Y. Chandramohan, V. Ravindra Babu and M. Rajendar Reddy

Abstract

Handling of segregating populations, especially in early generation is a tricky issue. Due to segregation, identification of desirable plant types is quite difficult and at the same time, there are chances of losing them. The aim of this study were determine selection gain and selection intensity for high yield, i.e. to estimate the genetic potential transferred from F2 generation to F3 generation by using a total of 85 progenies in F3 generation during kharif, 2014. All the 85 entries belonging to two selected rice crosses viz. Keshari x IR-64, Keshari x RPBio 226, were sown separately on 4th July, 2014. The analysis of these early generation selection data was done to estimate selection intensity and selection gain for 85 rice progenies. Highest selection intensity was observed for the crosses Keshari x IR-64, When comparing selection intensity in between F2 and F3, generations it was increased for twoncrosses studied in the experiment, indicating that the selections were progressed towards yield improvement. Selection gain is greater than the expected mean yield in F3 generation for the cross Keshari x RPBio226 i.e., increased for the cross in next generation, indicating that selection is effective for grain yield. Selection gain is lower than expected mean yield for the cross Keshari x IR-64, i.e., decreased for the cross in next generation, indicating that selection is ineffective for grain yield.

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