Changes in endogenous hormones in fruit during growth and development of date palm fruits.

摘要

The length and diameter of pollinated and un-pollinated fruits of two date cultivars, piarom and shahani, were measured. Concentration of endogenous hormones in pulp during different stages of fruit growth and development were also determined by spectrophotometric techniques. The results indicated that a relatively rapid increase of fruits length occurred until 15 weeks after pollination thereafter, growth rate was moderate. In two cultivars, auxin and zeatin content, similar to gibberellins (GA) were increased gradually during the early fruit growth stage and the highest value was detected at 12 and 16 weeks after pollination, respectively. Changes in ABA levels were closely associated with ripening. In conclusion, data on un-pollinated fruits show the same pattern of growth, though at a different rate un-pollinated fruits contained lower hormones levels than pollinated fruits in both cultivars. Comparing hormonal changes pattern curve in the fruits of this cultivars, it is seen that there are a little differences among the cultivars.