Influence of seed location on cotton fiber development in planta and in vitro
1994
Davidonis, Gayle | Hinojosa, Oscar
A number of different levels of competition for resources have been described that influence cotton (Gossypium hirsutum L.) fiber quality. These include the number of bolls on a fruiting branch, and on a secondary level, the location of seeds within a locule. Cotton ovule culture was employed to assess the contribution of competition for resources to fiber quality. Elongation and secondary wall deposition were compared in plant-grown and culture-grown fibers. In plant-grown material, seeds located in the middle of a locule had the longest fibers. Fiber length distributions were similar for ovules taken from the apical, medial and basal locations in a locule and grown in ovule culture. Secondary wall deposition was greatest in fibers located on basal seeds or ovules. On a single seed or ovule, fibers in the micropylar region had thicker cell walls than in the chalazal region. Competition for resources has been eliminated in vitro and the same pattern of secondary wall deposition occurred in the micropylar and chalazal regions of seeds and ovules. Therefore, conditions present at the time of ovule excision influenced secondary wall deposition. One condition may be fiber diameter.
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