Response of some mango cultivars to polyamines [electronic resource].

Includes reference.

Two field experiments were carried out during 2002/2003 and 2003/2004 seasons to explore the effect of polyamines on fruit set, fruit let abscission, fruit retention, yield and fruit quality of some mango cultivars. Aqueous solutions of putrescine, spermidine and spermine at different concentrations (0, 125,250 and 500 ppm) were sprayed on Succary Abiad at growing panicles prior to the anthesis (Exp. 1), while Fagri Kalan, Langra and Mabrouka were sprayed by spermidine at different concentrations (0, 125,250 and 500 ppm) at the same growth stage (Exp. 2). In Succary Abiad cv., spermine at 250 ppm was more effective in increasing fruit set and reducing fruit let abscission, while 125 ppm was significantly increased fruit retention and consequently number of fruits per tree and yield. Morever. polyamines (especially spermine) were more effective in reducing fruitb let abscission during the first week after fruit set. Significant increments in fruit firmness, SSC and acidity were exhibited in fruit treated with polyamines. When different cultivars were sprayed by spermidine, Langra cv. gave better fruit set, fruit retention and yield than Fagri Kalan or Mabrouka cvs, whereas 250 ppm recorded the minimum abscised fruit lets in Fagri Kalan and Mabrouka cvs. So, the response of mangoes to polyamincs was influenced by type of polyamine, concentration and cultivar. In conclusion. polyamines reduced fruit let abscission and improved fruit set and retention, number of fruits and yield without impairing fruit quality in all cultivars.

Summary in Arabic.

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