Page 21 - FRUTAS DEL TRÓPICO

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RepRoductive physiology of mango

Figure 1. Conceptual flowering model of mango and citrus. The model summarizes the proposed
roles for various phytohormones in initiation of shoot growth and in defining the vegetative
or reproductive outcome of that growth (induction). Single lines in the scheme are promotive
and double lines are inhibitory.

AUXIN
PHOTOASSIMILATES FRUIT GIBBERELLINS A 3
A x

AUXIN VEGETATIVE SHOOT MIXED SHOOT GENERATIVE SHOOT
GIBBERELLINS
GA 3 GA 1
GA x
PROMOTER IN: CHILLING TEMP.
FREQUENT INDUCTION LEAVES (MANGO) WATER STRESS
VEGETATIVE STEMS (CITRUS) (CITRUS)
GROWTH WATER STRESS
SHOOT INITIATION
PRUNING
DEFOLIATION CHILLING TEMP.
FOLIAR NITROGEN
ETHYLENE (MANGO) ROOT INITIATION GIRDLING

STORAGE CARBOHYDRATES ROOTS CYTOKININS

One of three types of shoots is typically induced to develop from initiated buds: vegeta-

tive (leaves only), generative (determinate panicle or indeterminate inflorescences), or mixed

(composed of a leaf and lateral inflorescence inserted at each node or, in general, a mixture of

flowers and leaves). The type of shoots that are evoked upon initiation appear to be governed

by the interaction of a putative temperature-regulated florigenic promoter (FP) known to be
made in leaves of mango and stem tips of citrus and an age-dependent vegetative promoter

(VP), which is likely to be a gibberellin made in the same tissues as the that of the florigenic pro-

moter of each species (Davenport, 1990, 2000, 2002; Davenport and Nuñez-Elisea, 1997;

Universidad Autónoma de Chiapas