Abstract
Cold temperature (around 15°C) plays a major role in flower induction of mango trees. But so far hardly anything is known whether plant hormones mediate this temperature effect. To investigate this question, 16 potted 2-year-old 'Tommy Atkins' mango trees were subjected to either 13 or 25°C for 3 months, which led to almost 100 and 0% flowering trees, respectively. After changing the temperature the main plant hormones, viz. IAA, ABA, GA 3 and CK s were analyzed in terminal buds, bark and wood of the trees. IAA in leaf diffusates was also measured. In general, Z/ZR concentrations in all tissues, ABA in wood and IAA in leaf diffusates were higher, whereas GA 3 and IAA (wood and bark) were lower under cold temperature.
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