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Plant and Cell Physiology, 1986, Vol. 27, No. 4 725-728
© 1986

Short Communication

Ascorbate Oxidase Activity in Rice Shoot Apices during Panicle Initiation

K.P. Reddy, P.A. Khan, S. Patnaik, G.B. Mohanty and K.B. Kumar1

Department of Botany, Khallikote College Berhampur 760 001, Orissa, India

1To whom reprint requests should be addressed

There was a decrease in the ascorbate oxidase activity in the shoot apices of Oryza sativa L. cv BAM 11, a photo-sensitive rice variety. Ascorbic acid content in the shoot apex increased and exogenous application of ascorbic acid resulted in an earliness in panicle initiation. Photoperiodic treatment promoted panicle initiation with an early and faster decline in ascorbate oxidase activity. Decline in the activity of ascorbate oxidase showed a negative correlation with the increase in ascorbic acid content.

(Received November 11, 1985; Accepted February 17, 1986)
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