Effect of methyl jasmonate treatment on improvmentof vegetative and reproductive growth of “Ahmad Aghaie” pistachio

Pistachio has high nutritional value. Today, hormones and nutrients are used in order to improve vegetative and reproductive growth of many agricultural products in the world. In this study, the effect of different levels of methyl jasmonate (0, 100 and 200 mg/l) on vegetative and reproductive characteristics of “Ahmad Aghaie” pistachio to be considered. Thus, trees sprayed by treatments in two stages of the tight cluster and initial fruit set, in a split-factorial experiment in a randomized complete block design with 4 replications in field conditions. Then, many of vegetative and productive characteristics such as leaf area, chlorophyll index and current shoot length and diameter, indehiscent shell, fruit weight and yield were improved at both stage and methyl jasmonate decrease blank and misshapen nuts percentage. Generally, the results showed that spraying at both stages increased vegetative and productive characteristics of treated trees compared with control trees and between treatments, methyl jasmonate 200 mg/l had the highest effect on improving vegetative and productive of trees and spraying at tight cluster was effectiveness combined with the primary fruit set stage.