Respiration of developing castorbean seeds

Author:

Agrawal P. K.,Canvin D. T.

Abstract

The rate of oil synthesis in the developing castor oil seed increased from 0.02 mg oil.day−1.100 mg−1 (dry weight) at 6 days after fertilization to 3.84 mg.day−1.100 mg−1 30 days after fertilization. Thereafter, it decreased with no oil synthesis occurring in seed 54 days after pollination. The rate of respiration of the seed was generally correlated with the rate of oil synthesis and peak respiratory rates of 71 μl O2 and 125 μl CO2.h−1.100 mg−1 (fresh weight) were observed in seeds 27 days after fertilization. The respiratory quotient increased from 1.2 in seed 12 days after fertilization to 1.7 to 1.9 during the period of most rapid oil synthesis. The C6/C1 ratio was always less than 0.5 and indicated that the pentose phosphate pathway was operative at all stages of castor oil seed development.

Publisher

Canadian Science Publishing

Subject

Plant Science

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