Variation in Seed Quality Characteristics of Tropically Grown Soybeans1
- E. H. Paschal and
- M. A. Ellis2
Twenty-four soybean [Glycine max (L.) Merr.] collections were grown in two different seasons in Puerto Rico to determine the extent of variation in the incidence of seed infection by fungi and its effect on seed viability under tropcal conditions. Plants were harvested at maturity and 2 and 4 weeks after maturity to provide seed samples that were used to determine the incidence of total fungi, incidence of Phomopsis sp., sand emergence, and field emergence. Yield and other agronomic characters were determined from the plants that were harvested at maturity. The 2-week harvest delay reduced sand emergence and field emergence 7 and 14%, respectively. The 4-week harvest delay reduced sand emergence and field emergence 12 and 37% respectively. The incidence of fungi increased from 9% in the seed examined at maturity to 21% in the seed from the 2-week delayed harvest and 45% in the seed from the 4-week delayed harvest. The incidence of Phomopsis sp. exhibited a similar trend. Substantial genetic varation was encountered for the seed quality characters measured. Field emergence percentage was negatively correlated with the incidence of total fungi, the incidence of Phomopsis sp., seed size, and seed quality score. Many of the strains with superior seed qualty were from Southeast Asia where environmental conditions are not conducive to production of high quality seed.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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