ADDITIVE EFFECTS OF PACLOBUTRAZOL PREHARVEST SPRAY AND SOME POSTHARVEST DIP TREATMENTS ON KEEPING QUALITY AND STORABILITY OF "ANNA" APPLE FRUITS | ||||
| Journal of Plant Production | ||||
| Article 28, Volume 29, Issue 12, December 2004, Page 7385-7408 PDF (5.03 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2004.238971 | ||||
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| Authors | ||||
| Amira A. E. EI-Helaly,1; Mervat A. E. El-Shemy2; M. E. Sobieh3 | ||||
| 1Hort. Res. Station Sabahia Alex., Hort.Res.lns., A.R.C.Giza, Egypt. | ||||
| 2Hort. Res. Station Sakha Katr EI-Sheikh, Hort.Res.lns., A.R.C.Giza, Egypt. | ||||
| 3Hort. Res. lnctltute, A.R.C.Giza, Egypt. | ||||
| Abstract | ||||
| This experiment was performed during 2003 and 2004 seasons. "Anna" apple trees were sprayed with PacJobutrazol (PB) 250 ppm or 500 ppm, 40 or 80 days after full bloom (FB), control ones were untreated. Mature fruits of each experimental trees, were picked and subjected to the following postharvest dip treatments for 4 minutes: 3% CaCI2 solution either under 350 mbar vacuum (Vac.) or not; hot water at 40°C (H.W) or tap water (as a control for dip treatments). Thereafter, fruits were stored at 3°C and 85-90% RH for 75 days. The results indicated that, in both seasons, as the storage period advanced, fruit shelf life period and V.C, malic acid contents and non reducing sugars and mineral elements % (N, P, K and Mg), significantly decreased, while the percentages of weight loss, disorders, reducing and total sugars, significantly increased. Neither PB preharvest spray, nor postharvest dip treatments, each alone influenced the storability of "Anna" fruits as same as the combination of two together. Combination treatments had a great effect on decreasing fruit weight loss and disorders %, beside increasing shelf life period and malic acid, reducing and total sugars content. However, that effect was not clearly noticed on V.C, non reducing sugars and mineral elements contents. Moreover, the fruit disorders were appeared for first time at 30 days of storage in fruits treated with postharvest dip treatments alone or those from untreated trees, while they did not notice even at 45 days of storage in fruits treated with PB 250 ppm (at both application times) + anyone of postharvest dip treatments. The rest treatments showed fruit disorders at 45 days of cold storage. CaCI2 postharvest dip treatments especially under vacuum, were more effective on improving storability, than hot water treatment, when combined with PB preharvest spray treatments. Generally, all PB treatments (when were used alone) almost had the same effect on improving storability of "Anna" fruits. Despite, the earlier application (FB+40days) was more effective on reducing fruit disorders %. | ||||
| Keywords | ||||
| "Anna" apple fruits; paclobutrazol; CaCI2; hot water and storability | ||||
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