Inheritance of inflorescence type and a study of environmental factors affecting flower shedding in soybeans

Van Schaik, P.H.

Dissertation Abstracts 21; 319; 1442-1443


ISSN/ISBN: 0099-3123
Accession: 014082232

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From a study of six crosses between four varieties it was found that the pedunculate type of inflorescence differed from the sessile by one factor pair (Sese). Inflorescence type was independent of growth habit and flower colour but closely associated with plant height and time of maturity. Genes conditioning long peduncle, high number of flowers per node and high percentage of flower shedding were partially dominant, herit-ability estimates being high for the first two of these characters but low for the last. Estimates of gene numbers were lowest for peduncle length and highest for shedding percentage. All estimates were however considered to be too low since the requirements for the application of the Castle-Wright formula were not fulfilled. Shedding percentage depended upon additive gene action. Gene-action determinations were inconclusive in the case of peduncle length and flower number. Highly significant and positive correlation coefficients were obtained between peduncle length and flower number and between flower production and percentage lost by shedding. Correlation coefficients between numbers of flowers and pods per node were inconsistent in the various crosses; high production of flowers did not therefore necessarily contribute to high yield. Failure of pollination and fertilization were considered to be two major causes of flower and pod shedding.