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EFFECT OF PACLOBUTRAZOL AND GIBBERELLIC ACID (GA3) ON THE ROOT GROWTH AND BIOMASS PARTITIONING OF CITRUS LEAF CUTTINGS

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Rooted leaf cuttings of Citrus macrophylla Wester were grown in a nutrient solution culture to which growth regulators were added as follows: (a) none (control); (b) paclobutrazol2 at 2 ppm (paclo-2); (c) paclobutrazol at 10 ppm (paclo-10); (d) GA3 at 10 ppm (GA-10); and (e) paclobutrazol and GA3 at 10 ppm each (paclo-10 + GA-10). After 76 days of continuous treatment, no significant changes in leaf area or weight were found in any of the plants. The major effects of paclobutrazol and GA3 were exerted on root morphology and on the partitioning of biomass among the root parts. Paclobutrazol decreased the length of the taproot and of the lateral roots and increased the thickness of lateral roots. When administered alone, GA3 increased the length of the taproot and the thickness of the taproot base. Addition of GA-10 to paclo-10 reversed some of the effects caused by the latter chemical. In all the treatment combinations, the number of lateral roots was smaller than in control plants. During the 76 days of treatment, the total plant dry weight increased more than twofold, solely due to the gain in root mass. The root weight per plant was slightly increased by GA-10 alone and it decreased in the presence of paclo-10, but the values were not significantly different from those in the control. The proportion of root biomass allocated to the taproot was remarkably increased by the GA-10 and paclo-10 + GA- 10 treatments and slightly decreased by paclobutrazol as compared with the control.

Affiliations: 1: Institute of Horticulture, Agricultural Research Organization, The Volcani Center

10.1080/0021213X.1988.10677096
/content/journals/10.1080/0021213x.1988.10677096
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/content/journals/10.1080/0021213x.1988.10677096
1988-04-12
2018-06-24

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