Plant and Cell Physiology, 2001, Vol. 42, No. 11 1290-1293
© 2001 Oxford University Press
Involvement of Gibberellins in Expression of a Cysteine Proteinase (SH-EP) in Cotyledons of Vigna mungo Seedlings
1 Department of Biological Sciences, Tokyo Metropolitan University, Minami-ohsawa, Hachioji, Tokyo, 192-0397 Japan 2 Biotechnology Research Center, The University of Tokyo, Bunkyo-Ku, Tokyo, 113-8657 Japan
The expression of a papain-type proteinase, designated SH-EP, in cotyledons of Vigna mungo seedlings has been shown to require some factors in the embryonic axes. Gibberellin A1 (GA1) and GA20 were identified by GC-MS in embryonic axes of V. mungo seedlings. The level of accumulation of SH-EP in cotyledons of V. mungo seedlings was greatly reduced by treatment of the seeds with uniconazole-P, an inhibitor for GA biosynthesis. The reduced level of accumulation of SH-EP in cotyledons by uniconazole-P was recovered by exogenous application of GA1 and GA20 to the seedlings.
3 Corresponding author: E-mail, okamoto-takashi@c.metro-u.ac.jp; Fax, +81-426-77-2559.
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