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Effect of Gibberellin and Auxin on Parthenocarpic Fruit Growth Induction

AutorSerrani, Juan Carlos; Fos, Mariano; Atarés Huerta, Alejandro; García-Martínez, José-Luis
Palabras claveOVARIES
Fecha de publicación2007
CitaciónJOURNAL OF PLANT GROWTH REGULATION, 26/3 : 211-221 (2007)
ResumenThe effect of applied gibberellin (GA) and auxin on fruit-set and growth has been investigated in 3 tomato (Solanum lycopersicum L.) cv Micro-Tom. It was found that to prevent competition 4 between developing fruits only one fruit per truss should be left in the plant. Unpollinated 5 ovaries responded to GA3 and to different auxins [indol-3-acetic acid, naphthaleneacetic acid, 6 and 2,4-dichlorophenoxyacetic acid (2,4-D)], 2,4-D being the most efficient. GA3- and 2,4-D7 induced fruits had different internal morphology, with poor locular tissue development in the 8 case of GA, and pseudoembryos development in the case of 2,4-D. Also, GA3 produced larger 9 cells in the internal region of the mesocarp (IM) associated with higher mean C values while 10 2,4-D produced more cell layers in the pericarp than pollinated fruits. The smaller size of GA3- 11 compared to 2,4-D-induced fruits was due to them having fewer cells, only partially 12 compensated by the larger size of IM cells. Simultaneous application of GA3 and 2,4-D 13 produced parthenocarpic fruits similar to pollinated fruits, but for the absence of seeds, 14 suggesting that both kinds of hormones are involved in the induction of fruit development upon 15 pollination. It is concluded that Micro-Tom constitutes a convenient model system, compared to 16 tall cultivars, to investigate the hormonal regulation of fruit development in tomato. 17 Key words: Auxin; Fruit-growth; Fruit-set; Gibberellins; Micro-Tom; Parthenocarpic growth;Tomato
Versión del editorhttp://dx.doi.org/10.1007/s00344-007-9014-7
ISSNISSN: 0721-7595
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