The seed oil content of male sterile plants and their progenies was analised by a NMR spectroscope to study the possibility of recurrent selection to improve the oil content. The seeds derived from a composite named "IAC-1" with genetic male sterility and large variability with respect to oil content. The repeatability coefficient (r) for oil content of each seed of the male sterile plant, was determined as a phenotipic measurement. A value of r = 0.65 was obtained. This value indicates that four or five seeds may represent the parental female plant which is an important step to assure success of recurrent selection in this composite. The value of h² = 0.73 was obtained for the covariance of average value of male sterile plants and average of progenies. Due to this high value and assuming that the main component of the genetic variability for oil content is of additive nature, this phenotipic selection may be recommended . For the average of progenies the heritability values of 0.66 and 0.85 were obtained for two and seven progenies respectively.These results suggest the possibility of recurrent selection in the composite 'IAC-1' both in the field with male sterile plants or at the greenhouse when selection is based on average values of progenies.
plant breeding; soybean; vegetable oil; recurrent selection; genetic male sterility; NMR spectroscopy