Mahdi Shaeri; Vali Rabie; Mehdi Taheri
Abstract
Rootstock and cultivar selection is the most critical decision at the time of an apple orchard establishment. Tree size, yield and fruit quality are affected by roostock and cultivar. Non-sufficient study of rootstocks and cultivars effects on mentioned traits will lead to incorrect result or failure ...
Read More
Rootstock and cultivar selection is the most critical decision at the time of an apple orchard establishment. Tree size, yield and fruit quality are affected by roostock and cultivar. Non-sufficient study of rootstocks and cultivars effects on mentioned traits will lead to incorrect result or failure in orchard managing. In this study the effects of three vegetative rootstocks (MM106, MM111 and M9) on vegetative and reproductive growth and some physiological characteristics of three apple )Malus domestica Borkh.( cultivars, ‘Golden Delicious’, ‘Fuji’ and ‘Delbarestival’ were evaluated in a factorial experiment based on randomized complete block design in Khodabande (Zanjan Province) during two growing seasons in 2011 and 2012. The results showed that different combinations of rootstock and cultivar have significant effects on vegetative vigor, primary and final fruit set, yield per tree and yield per hectare, amount of fruit dry weight, leaf photosynthesis rate, stomatal conductivity and transpiration rate, water use efficiency and leaf soluble carbohydrates. In two years of study, ‘Golden Delicious’ and ‘Fuji’ cultivars had the highest and lowest fruit length, respectively. The highest trees were observed in ‘Delbarestival’ cultivar. Among the evaluated rootstocks, the lowest tree canopy diameter was measured in M9 rootstock. Nitrate reductase activity was affected by cultivar and rootstock and the highest activity of this enzyme was measured in leaves of ‘Golden Delicious’ cultivar grafted on M9 rootstock. ‘Delbarestival’ onto MM106 rootstock and ‘Golden Delicious’ onto M9 rootstock were the most appropriate grafting combination based on the studied traits in this research .
mahdi mohammad zan=mani; vali rabiei; Mohammad Ali Nejatian; Mehdi Taheri
Abstract
Proline and glycine betaine are the most common compatible solutes that prevent plants from destructive effects of osmotic stresses by osmotic adjustment and protection of membranes, proteins and enzymes. It has been reported that exogenous application of these compounds, can increase plant resistance ...
Read More
Proline and glycine betaine are the most common compatible solutes that prevent plants from destructive effects of osmotic stresses by osmotic adjustment and protection of membranes, proteins and enzymes. It has been reported that exogenous application of these compounds, can increase plant resistance to drought stress. Therefore a factorial experiment based on randomized complete block design with four replications was performed in four grapevine cultivars (‘Khushnav’, ‘Peykani’, ‘Perlette’, and ‘Flame Seedless’). Grapevines were irrigated by 70 percent of the vine water requirement, in drought stress treatment. Proline (10 mM) and glycine betaine (15 mM) were sprayed on grapevines at four growth stages (before flowering, flowering, sour cluster and veraison). Results showed that endogenous proline and amount of glycine betaine, peroxidase and ascorbate peroxidase enzyme activity in treated vines were significantly higher than the control, in both proline and glycine betaine treatments. Among of the treated vines, the most and the least amount of proline was measured in ‘Flame Seedless’ and ‘Peykani’, respectively. Other measured traits in cultivars did not show significant difference. According to the role of these enzymes in eliminating reactive oxygen spices (ROS) and also the role of proline and glycine betaine in antioxidants activating, using of these two osmolytes will be able to increase the vines tolerance to drought stress conditions.