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Early Generation Selection for Grain‐Filling Period in Wheat
Author(s) -
Sharma R. C.
Publication year - 1994
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1994.0011183x003400040020x
Subject(s) - heritability , biology , genetic gain , agronomy , selection (genetic algorithm) , green fluorescent protein , grain yield , zoology , cultivar , yield (engineering) , trait , biomass (ecology) , seeding , botany , horticulture , genetic variation , genetics , gene , materials science , artificial intelligence , computer science , metallurgy , programming language
Grain‐filling period (GFP) may be a useful physiological selection trait that could influence grain yield of cereals. This study was conducted to estimate heritability of GFP and to determine the response to selection for long and short GFP in six genetically diverse populations of spring wheat ( Triticum aestivum L. emend. Thell.). Selections were made in the F 2 generation and selected progenies were evaluated in replicated field tests in the F 3 generation. The tests were seeded under normal and late conditions at Rampur, Nepal, in 1990. Date of seeding had a significant effect on GFP, grain and biomass yield, harvest index, and hundred kernel weight. Selection in the F 2 for long and short GFP was effective in identifying F 3 lines with long and short GFP, respectively. Also, selection for long GFP usually resulted in higher grain and biomass yield. Average harvest index and hundred kernel weight of the long GFP lines were higher than those of the short GFP fines. Realized heritability estimates for GFP were intermediate to high in magnitude (0.52–0.86). Duration of GFP had a high positive genotypic correlation with grain yield (0.52–0.79), harvest index (0.50–0.80), and hundred kernel weight (0.53–0.72). Results indicated that selection for long GFP in early segregating generations should bring about positive improvements in these yield components.