FOLIAR SPRAY WITH ABG-3168, GA3, CACL2 AND H3B03 CORRELATED TO . MATURITY, RIPENING AND STORABILITY OF ANNA APPLE FRUITS | ||||
| Journal of Plant Production | ||||
| Article 9, Volume 29, Issue 11, November 2004, Page 6469-6482 PDF (3.66 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2004.238878 | ||||
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| Authors | ||||
| M. A. Awad,1; E. F. A. EI-Dengawy1; G. I. Eliwa2 | ||||
| 1Mansoura University 35516, Faculty of Agriculture, Pomology Department, EI-Mansoura/Egypt | ||||
| 2Horticulture Research Institute, ARC, Giza/Egypt | ||||
| Abstract | ||||
| The influences of ABG-3168 (ReTain), GA3, calcium and boron applications, at about four weeks before commercial harvest date, on maturity, ripening, pre- harvest drop and storability of Anna apple fruits (Malus demestica Borkh) were investigated during the two successive seasons of 2002 and 2003. The results showed that most maturity/ripening related fruit characteristics were significantly influenced by the tested treatments. ABG. ABG-treated fruits, at 250 and 500 ppm, were approximately one (Kg) firmer than non-treated ones on a given sampling date during both pre and post-harvest phases. Red color formation was inhibited, conversion of starch into sugar was less advanced and acidity was higher in this fruit compared with the control, indicating that maturation and ripening had been suppressed. ABG-treated fruits also contained a significant higher TSS concentration, only after shelf life, than the other treatments. Both the rate and the onset of red color accumulation were clearly stimulated and advanced (about one week) by boron application at both 50 and 100 ppm without hastening fruit ripening compared with the control. Pre-harvest fruit drop was effectively controlled by ABG application at both 250 and 500 ppm. While, CaCI2 application at 2% greatly increased pre-harvest drop and caused leaf scorching. Gibberellic acid application, especially at 500 ppm, significantly increased fruit diameter in contrast to ABG one, especially at 500 ppm, which slightly decreased it compared with the control. Fruit weight was not significantly influenced by any of the applied treatments. The occurrence of browning was greatly decreased during storage and was completely eliminated during one week of shelf life by ABG application. However, the other treatments either had no significant effect or even increased the occurrence of browning. Our results herein pointed to ABG pre-harvest treatment as the best one to delay maturity and ripening and to improve the storability of Anna apple fruits under the Egyptian conditions. The efficacy of ABG treatment at the low concentration (250 ppm) was equal or even better than the high concentration (500 ppm). Also, the low concentration of ABG had less negative impact on fruit red colour formation and diameter. | ||||
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