Abstract
SummaryDormant buds of mango are nondifferentiated, consisting of an arrested apical meristem and a set of preformed nodes. Cool temperatures around 15°C promote inflorescence (panicle) morphogenesis. Inflorescence differentiation involves a putative floral stimulus generated in mature leaves and translocated in the phloem. In field-grown ‘Keitt’ and ‘Tommy Atkins’ mango trees, branches bearing flowering shoots were girdled and defoliated (or defoliated and then girdled) using different lag periods to disrupt transport of the floral stimulus and prevent its production. The shoots were deblossomed on day 0 to activate growth and differentiation of axillary buds. Only vegetative shoots were produced when branches were girdled and defoliated at the same time. With the maximum lag period of 15 d, about 90% of deblossomed shoots produced axillary inflorescences. Girdled branches that were not defoliated produced inflorescences only. Thus, inflorescence morphogenesis required the presence of leaves during activ...
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