Photosynthesis during leaf development in jl 24 groundnut arachis hypogaea

Jamadagni, B.M.; Sengupta, U.K.

Indian Journal of Agricultural Sciences 62(4): 268-272


ISSN/ISBN: 0019-5022
Accession: 007654247

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An experiment was conducted during 1986 to study the rate of photosynthesis during leaf development in 'JL24' groundnut (Arachis hypogea L.). The mean photosynthetic rate showed a sharp rise during early development and reached a peak at 12 days. Thereafter it declined slowly and attained a steady state during later part of the leaf growth. Basal 7 leaves were produced during preflowering phase, which had smaller surface area but showed high photosynthetic rates (14.37-18.37 mg CO2/decimetre2/hr.) Central 4 leaves appeared between flowering and pod initiation, had larger size and showed moderate rates of photosynthesis (12.80-13.89 mg CO2/dm2/hr); whereas 3 terminal leaves emerged during pod development and showed low mean photosynthetic rates (8.00-10.41 mg CO2/mg2/hr). A cubic equation Yp = 12.042 + 0.6809 X -0.0188 X2 + 0.001 X3 (R2 = 0.815) explained the general pattern of changes in photosynthetic rate during leaf development in groundnut.