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Intra-cultivar variation in cotton: response to single-plant yield selection at low density

Published online by Cambridge University Press:  12 August 2010

I. S. TOKATLIDIS ,
C. TSIKRIKONI ,
A. S. LITHOURGIDIS ,
J. T. TSIALTAS  and
C. TZANTARMAS
I. S. TOKATLIDIS*
Affiliation:
Department of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece
C. TSIKRIKONI
Affiliation:
Department of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece
A. S. LITHOURGIDIS
Affiliation:
Department of Agronomy, Aristotle University Farm of Thessaloniki, 57001 Thermi, Greece
J. T. TSIALTAS
Affiliation:
Cotton and Industrial Plants Institute, NAGREF, 57400 Sindos, Greece
C. TZANTARMAS
Affiliation:
Department of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece
*
*To whom all correspondence should be addressed. E-mail: [email protected]; [email protected]
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Summary

In a 5-year study (2004–2008), the possibility of exploiting intra-cultivar variation in cotton (Gossypium hirsutum L.) was investigated. Honeycomb single-plant selection for seedcotton yield was employed within three cultivars at a low density of 1·15 plants/m2. First- and second-generation progeny lines (1GPLs and 2GPLs) were evaluated for seedcotton yield at low density at three sites, whereas third-generation progeny lines (3GPLs) were tested at the crop density of 10 plants/m2 across two sites and 2 years. Significant differentiation for seedcotton yield was discovered within cultivar (cvar) Christina and cvar Corona at both low and crop densities, and within cvar Flora at low density. In addition, significant intra-cultivar heterogeneity for fibre quality properties was found at crop density. The 1GPLs and 2GPLs grown at low density showed increases in seedcotton yield of 16 and 19%, respectively, in cvar Christina, and of 2·6 and 3·7%, respectively, in cvar Corona. In cvar Flora, the 1GPLs and 2GPLs yielded 10 and 3·3% lower than the mother cultivar, respectively. When grown at standard crop density, across sites and years, 12 and 5·2% higher yield was obtained by the Christina-derived 3GPLs and the Corona-derived 3GPLs, respectively, when compared with the original cultivars. These results provide evidence that elite cultivars are not homogeneous but rather heterogeneous material, within which selections can be made to maintain or improve uniformity and further improve desirable agronomic traits.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 149 , Issue 2 , April 2011 , pp. 197 - 204
Copyright
Copyright © Cambridge University Press 2010

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