ABM Sharif Hossain and Fusao Mizutani
Keywords: Cytokinin, dwarfing, ringing.
Abstract: Cytokinin content in roots of peach trees (Prunus persica Batsch cv. Hikawahakuho) as affected by phloemic stress (bark ring) was studied. The treatments were applied to the trunk as control (no ringing), partial ringing [(represented by phloemic stress) PR] and complete ringing (CR). Phloem ring was made by peeling out 2 cm length of bark (phloem) from the trunk leaving a connecting 2 mm thickness of phloem strip (a bridge) while complete ringing (CR) left no phloem strip. Trunk diameter was higher in PR and CR treated trees than in un-ringed trees. Trunk diameter was higher above the ring than in below the ring both in PR and CR treated trees. However, it was higher in above the ring in case of PR and CR treated trees than in lower the ring both in PR and CR treated trees. The cytokinin content represented by callus weight was higher in control trees than in PR and CR treated trees. The results showed that cytokinin content decreased in roots of PR and CR treated trees. The results also indicated that growth promoting hormone (cytokinin) in peach roots affected overall plant nutrition and growth inhibiting hormon that led small sized peach trees.
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