ISHS Acta Horticulturae 329: VII International Symposium on Plant Growth Regulators in Fruit Production
ROOT-SHOOT RELATIONS AS AFFECTED BY PGR APPLICATION AND ROOT MANIPULATION |
| Authors: | G. COSTA, G. VIZZOTTO, A. MAROE |
| Abstract:
The present study was carried out to develop a model plant system to assess the effect of PGR application and of root manipulation on vegetative growth. Micropropagated GF 677 peach-almond hybrid rootstocks were grown in pots, each having 1,350 ml volume. Two PGRs, a triazol BAS 111 (1- phenoxy-5, 5-dimethyl-3-(1,2,4-triazol-lyl)-hexan-5-ol) and SADH (succinic acid 2,2-dimethylhydrazide), were applied directly on collar tissue and as soil application, respectively, when seedlings were 169 mm high, 35 days after transplant. Vegetative parameters studied (shoot elongation, number of leaves, leaf area, fresh and dry weight, relative growth rate) were affected by both PGRs applications. Growth control induced by BAS 111 was faster than SADH: it appeared 5 days after treatment compared to ten days for SADH. The growth regulators had contrasting effects on the root/shoot ratio: BAS 111 enhanced it and SADH reduced it. IAA-oxidase activity present at collar tissue level, which was chosen as a possible crucial site of regulation in root/shoot interdipendence, showed higher values in PGR-treated plants than control. | |
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