Effect of the growth retardant 3,5-dioxo-4-buttyryl-cyclohexane carboxylic-acid-ethyl-ester and acylcyclohexanedione compound, on fruit-growth and gibberellin content of pollinated and unpollinated ovaries in pea
1995
Santes, C.M. | García-Martínez, José-Luis
Treatment of pollinated pea (Pisum sativum L. cv Alaska, line V1) ovaries with 3,5-dioxo-4-butyryl-cyclohexane carboxylic acid ethyl ester (LAB), an acylcyclohexanedione derivative that competitively inhibits 2-oxoglutarate-dependent gibberellin (GA) dioxygenases, caused a reduction of pod elongation proportional to the amount of inhibitor applied. The effect of LAB was counteracted by GA(1) and GA(3), and partially by GA(20). The inhibitor decreased the contents of GA(1) and GA(3) (the purported active GAs) and GA(8), increased those of GA(19) and GA(20), and did not affect that of GA(29) in both the pod and the developing seeds. These results provide evidence that GA(1) and/or GA(3) control pod development in pea and show that GA(20) is not active per se. In contrast to its effect on pollinated ovaries, LAB promoted parthenocarpic development of unpollinated ovaries, which is associated with an increase of GA(1) and GA(8) content. The inhibitor enhanced the response of unpollinated ovaries to GA(1) and GA(20) but it did not alter the response to GA(3). LAB is proposed to promote parthenocarpic development and enhance the response to exogenous GAs by blocking the 2 beta-hydroxylation of GA(1) more efficiently than 3 beta-hydroxylation of GA(20).
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