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This article in AJ

  1. Vol. 69 No. 1, p. 37-40
     
    Received: Apr 29, 1976
    Published: Jan, 1977


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doi:10.2134/agronj1977.00021962006900010010x

Dry Seed Fatty Acid Composition and Seedling Emergence of Pima Cotton at Low Soil Temperatures1

  1. Edmund J. Bartkowski,
  2. D. R. Buxton,
  3. D. R. Buxton,
  4. R. H. Katterman and
  5. Henry W. Kircher2

Abstract

Abstract

The development of a rapid test to predict cotton lines (Gossypium spp.) which exhibit increased resistance to chilling injury would be a valuable breeding tool. The objective of this study was to evaluate the relationship of Pima cottonseed (G. barbadense L.) lipid composition to seed germination and seedling emergence under field conditions with low soil temperatures. Seed fatty acid methyl esters of selected genotypes were analyzed by gas-liquid chromatography. Total seed lipid was fractionated into polar and neutral components and their associated fatty acid methyl esters were similarly analyzed. Low correlations were obtained between unsaturated/ saturated (U/S) fatty acid ratios of total seed lipid and laboratory germination percentages. However, seedling emergence under field conditions with low soil temperatures correlated strongly with U/S fatty acid ratios of total seed and polar lipids (r = 0.97** and 0.95% respectively)3. No advantage was realized by using polar lipids over total seed lipid for the analysis. Results of this study suggest the feasibility of using the rapid analysis of total seed lipid associated U/S fatty acid ratios for identifying cotton lines with chilling resistance during seed germination and emergence.

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