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Impact of Heterozygosity and Heterogeneity on Cotton Lint Yield Stability

Permanent URL:
http://handle.nal.usda.gov/10113/34951
Abstract:
In the last 8 yr, cotton (Gossypium hirsutum L.) growers in North Carolina have experienced variations in the year-to-year lint yield averages that range from a 56% increase to a 49% decrease. This variability results in wild fluctuations in income and a desire for more stable yields. Genetic structure may contribute to stability. This study was conducted to determine the impact of heterozygosity and heterogeneity on lint yield stability. Lint yield was observed in 18 environments over 3 yr among four population types that included homozygous lines grown in pure stands, homozygous lines grown in blended stands, hybrids grown in pure stands, and hybrids grown in blended stands. Comparisons were made using trait means, standard deviations, and the coefficients of variation (CVs) calculated over environments. There was no significant difference between lines grown in pure stands and blended lines with respect to yield or stability. Hybrids had a lower CV (were more stable) than homozygous lines. This stability was attributed to the hybrids and blends of hybrids out-yielding the homozygous lines and blends of homozygous lines in the low-yielding environments, but having similar yields in the high-yielding environments. These results do not support growing blends to increase stability or yield; however, growing hybrid cultivars could result in increased yields while reducing variability compared with current production practices.
Author(s):
Cole, C.B. , Bowman, D.T. , Bourland, F.M. , Caldwell, W.D. , Campbell, B.T. , Fraser, D.E. , Weaver, D.B.
Subject(s):
Gossypium hirsutum , cotton , crop yield , farm income , population genetics , genetic variation , heterozygosity , cultivars , hybrids , homozygosity , North Carolina
Format:
p. 1577-1585.
Note:
Includes references
Source:
Crop science 2009 Sept-Oct, v. 49, no. 5
Language:
English
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.