Effect of maleic hydrazide on endogenous cytokinin contents in lateral buds, and its possible role in ̄ower bud formation on the Japanese pear shoot
نویسندگان
چکیده
In order to elucidate the role of maleic hydrazide (MH, 1,2-dihydro-3,6-pyridazinedione; coline salt) in increasing ̄ower bud formation on the Japanese pear, the effect of MH on cytokinin contents in the lateral buds of Japanese pear shoots were investigated. Foliar application of MH at 2600 mg lÿ1 increased zeatin, zeatinriboside, and isopentenyladenine levels in lateral buds though isopentenyladenosine concentration decreased. Application of 2,3,5-triiodobenzoic acid (TIBA), an inhibitor of polar auxin transport, also increased the endogenous cytokinin levels in lateral buds. It is supposed that these increases of cytokinin in lateral buds may be involved in the increase of ̄ower bud production on the Japanese pear shoot. The increases of cytokinin induced by these chemicals may be caused via the depletion of the auxin level and/or the activity in shoot tissues. # 2001 Elsevier Science B.V. All rights reserved.
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