Shoot soluble carbohydrate content as a measure of daily C-assimilation in rice
1994
Conocono, E.A. | Egdane, J.A. | Setter, T.L. (International Rice Research Inst., Los Banos, Laguna (Philippines). Agronomy, Plant Physiology and Agroecology Div.)
Current methods for measuring carbon assimilation require a large number of photosynthesis measurements at different times of the day in order to give an accurate estimation on a daily basis. This is impractical and expensive in terms of labor and equipment. Large scale applications such as cultivar screening require a simple method needing only one or two samples. Measuring the soluble sugar levels in the plant may give a better estimate of carbon assimilated over the day. This relies on a direct relationship between shoot carbohydrate content and daily radiation. To test this, main stems of IR72 plants growing in the field were harvested at four growth stages: newly transplanted seedlings, mid-tillering, panicle initiation and flowering. Soluble sugar levels in the shoot gave high correlation with daily radiation (R to the 2nd power = 0.94, n = 16) at panicle initiation but not in the other three stages. Low correlations at these stages may be due to translocation of carbohydrates to rapidly growing tissues or for grain filling. The excellent correlation with daily radiation shows that shoot soluble carbohydrate content at panicle initiation gives an accurate measure of carbon assimilation over the whole day
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