Water-soluble Carbohydrate Accumulation in Soybean Plants
1976
Dunphy, E. J. | Hanway, J. J.
Because metabolic processes in plants are dependent on water-soluble carbohydrates (WSC), information concerning the effects of different factors on the WSC contents of plants should be useful in the development of improved practices. Soybean [Glycine max (L.) Merrill] plant samples from field fertility experiments on Webster soil (Typic Haplaquoll) were collected and analyzed during two growing seasons to study the effect of different variables on WSC contents of different plant parts at various stages of plant development. WSC in dried plant samples were extracted with hot water and determined using a phenolsulfuric acid colorimetric method with glucose as a standard. The WSC content of leaves and petioles increased between 0900 and 1300 hours daily. WSC contents generally were higher in 1971 than in 1972. Differences in WSC among cultivars and fertility levels were relatively small. Percentages of WSC in leaves increased throughout the growing season, but in stems and petioles increased only until seed development became rapid. WSC contents of stems, petioles, and pods decreased as the seeds developed. This decrease may indicate that soluble CHO (metabolically active carbohydrate) becomes a limiting factor for seed production during the seed-filling period.
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