Indian Society of Genetics & Plant Breeding

Early generation testing and response to selection in three crosses of rice (Oryza sativa L.)

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One hundred and fifty seven F4 progenies from three
Basmati x non-Basmati crosses, selected on the basis of
high yield/plant and harvest index in the genetic
background of fine grain quality characteristics from 498
3 progenies were evaluated in the augmented randomized
block design under two environments i.e. 120 kg N/ha
(E-I) and 160 kg N/ha (E-II). Estimates of correlation
coefficients between selected F
3 progenies and
corresponding F
4 lines were highly significant and positive
with respect to grain yield/plant, biological yield/ plant
and 1000-seed weight. At lowest selection intensity,
standardized selection differential was the highest for all
traits. Standardized response to selection at such low
selection intensity was the highest for all traits in E-II
and equally good in E-!. Realized heritability for grain
yield/plant was high at 5%, 10% and 15% selection
intensities in E-I!. For 1000-grain weight the estimated
realized heritability was high in all cases.

Keywords: Basmati x non-Basmati crosses, standardized selection differential, standardized response to selection, early generation testing, realized heritability


Year: 2005
Volume: 65
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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