IMPACT OF THE INTERACTION BETWEEN AMINO ACIDS (AA), NAPHTHALENE ACETIC ACID (NAA) AND NAPHTHALENE ACETAMIDE (NAD) ON SANTA ROSA PLUM FRUIT ABSCISSION, YIELD AND QUALITY. | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 30, Volume 96, Issue 1, March 2018, Page 219-234 PDF (5.43 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2018.132160 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| THANAA SH.,AZZA I.and ABD EL-AZIZ. MAHMOUD,MOHAMED | ||||
| Department of Horticultural Crops Technology, National Research Center, Dokki, Giza, Egypt. Deciduous Fruit Res. Department, Horticulture Research Institute, ARC, Giza, Egypt. | ||||
| Abstract | ||||
| To decrease fruit abscission, increase yield and improve fruit quality of Santa Rosa (Prunus salicina Lindl.) plum; amino acids (AA), naphthalene acetic acid (NAA) and naphthalene acetamide (NAD) and a combination of them were applied at different concentrations; at full bloom stage and one week after fruit setting stage during 2015 and 2016, in a private orchard at Ashmoun, Monofia governorate, Egypt. Results indicated that fruit set percentage significantly increased by all AA, NAA and NAD treatments compared to the control. AA 0.25 ml/L+NAA 10 ppm + NAD at 10 ppm recorded the highest significant fruit set percentage and the lowest significant fruit drop percentage and gave the maximum yield (62- 64 Kg/ tree). With regard to fruit quality, the same treatment increased fruit weight, length, diameter, firmness, pulp/stone ratio, and total soluble solids content, but decreased titratable acidity in Santa Rosa plum. In addition, total carbohydrates, total nitrogen, and C/N ratio in leaves were higher in treated trees than the control ones. Anatomical studies indicated that inactive embryo development after ovule fertilization may be the major cause of young fruit drop observed in ‘Santa Rosa’ plum trees. Furthermore, there was a relationship between physiological fruit drop which occurred from the middle of Growth Stage 2 to the beginning of Growth Stage 3, and seed development which contains inactive endosperm. From this study, it can be concluded that the combination of AA, NAA, and NAD increased fruit set, reduced fruit abscission, enhanced C/N ratio in leaves, and improved fruit yield and quality of Santa Rosa plum. Thus, it may be recommended to spray AA 0.25 ml/l +NAA 10 ppm + NAD 10 ppm under similar conditions | ||||
| Keywords | ||||
| Plum; Amino acids; Naphthalene Acetic Acid and Naphthalene Acetamide; fruit abscission; yield | ||||
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