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Characteristics of a Waxy Phenotype of Cotton (G. Hirsutum) Derived from a Trispecies Hybrid (A1 X D2-1 X Ad1)

Gwen G. Coyle, Jinfa Zhang, A.L. Nepomuceno and J.M. Stewart


Cotton genotypes with higher photosynthetic rates per unit leaf area are needed for genetic improvement. We observed genetic variations in photosynthesis among progeny from a trispecies hybrid. This study was initiated to determine some of the characteristics of a selection that had a waxy texture, apparently thicker leaves, and a high photosynthetic rate in preliminary observations. The waxy parent, the reference parent cultivar Ark-8518, and the resulting F1 were grown in field plots in a randomized complete block design with 5 replications. The factors measured were wax per unit area of leaf, leaf thickness, chlorophyll per unit area, and photosynthesis. The waxy phenotype had a thicker leaf, however, the leaf thickness was not due to a heavy wax cuticle. The waxy phenotype had the highest photosynthetic rate per unit leaf area, and this was probably related to a higher chlorophyll level per unit area. The higher chlorophyll level may be related, in part, to more leaf volume per unit surface area.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pg. 594
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998