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Comparison of Selection Efficiency for Grain Yield in Two Population Densities of Four Spring Wheat Crosses 1
Author(s) -
Nass H. G.
Publication year - 1978
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/cropsci1978.0011183x001800010004x
Subject(s) - biology , population , seeding , selection (genetic algorithm) , grain yield , yield (engineering) , population density , agronomy , zoology , horticulture , demography , materials science , artificial intelligence , sociology , computer science , metallurgy
Selection efficiency for high‐yielding lines in four F2 populations of spring wheat ( Triticum aestivum L.) was compared at two population densities based on plant head weight. The mean yield of F 4 lines selected on the basis of high head weight as F 2 plants was greater than that of lines with low head weight, with significant differences at the 5% level in a combined 2‐year analysis. The mean yields of lines selected at high population densities were greater than those of lines selected at low population densities, irrespective of plant head weight in the F 2 . Almost twice as many lines yielding in the top 15% in F 4 were selected in F 2 at high population densities than at low population densities. A considerably smaller number of high‐yielding lines were from the lowyielding category in F 2 . The results suggest that individual plant selection should be practiced at high population densities if the selected lines are to be subsequently evaluated at high population densities comparable to commercial seeding rates.