Seyed marziyeh Hosseini valashkolaee; Yahya Tajvar; Masoud Azadbakht; Zeinab Rafie-rad
Abstract
Low temperature stress is one of the most important abiotic environmental stresses that affects the growth and yield of ornamental plants. In order to investigate of some physiological and biochemical indices of four varieties of ornamental Citrus used in urban landscapes under low temperature stress ...
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Low temperature stress is one of the most important abiotic environmental stresses that affects the growth and yield of ornamental plants. In order to investigate of some physiological and biochemical indices of four varieties of ornamental Citrus used in urban landscapes under low temperature stress conditions, a factorial experiment in a completely randomized design with three replications was conducted in the Citrus and Subtropical Fruits Research Center of Ramsar in 2015. Treatments were included the temperature with four levels (3, 0, -3 and -6˚C) and four varieties of ornamental Citrus including (Kumquat, Fingered citron, Calamondin and Limequat). Results showed that amounts of electrolyte leakage, water soaking, prolin content, antioxidant capacity, lipid peroxidation and superoxide dismutase activity were increased significantly by reducing of temperature, while chlorophyll and total chlorophyll contents were decreased. Accordingly, the lowest leaf water soaking (20.92%) and electrolyte leakage (30.81%) amount, which are destructive indices, were showed in Kamquate. Total chlorophyll amount (2.21 mg/gFW), antioxidant capacity (60.61%) and superoxide dismutase activity (26.53 IU/gFW), that are tolerability indices, were more relevant at Kamquate. In general, Kumquat could tolerate the freezing stress up to -3°C by increasing of some indices such as proline, soluble sugars, antioxidant capacity and superoxide dismutase activity.
Darioush Ramezan
Abstract
In order to study the effect of grafting on growth and fruit quality of melon under deficitirrigation the experiment was conducted as a split plot in a randomized complete block design with three replications during 2014 on the experimental farm of Imam Khomeini Higher Education center of Jihad-e-Keshawarzi ...
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In order to study the effect of grafting on growth and fruit quality of melon under deficitirrigation the experiment was conducted as a split plot in a randomized complete block design with three replications during 2014 on the experimental farm of Imam Khomeini Higher Education center of Jihad-e-Keshawarzi in Karaj. Treatments consisted arrangement of four grafting (melon grafted on Shintozwa and Ferro-RZ, self grafted and ungrafted melon) and three irrigation levels 60, 80 and 100 percent, based on total available water depletion. The mean comparision showed that maximum (25.54 mg/g FW) and minimum (16.98 mg/FW) sucrose content of fruits was obtained in non-grafted plants under irrifation 80% and Souski Zard grafted on Souski Zard in irrigation 60% respectively. Also, the maximum (13.2%) and minimum (8.48%) of soluble solids was related to fruit of non-grafted plants under 80% irrigation level and non-grafted plants in irrigation 60%, respectively. The highest (7.58) and the lowest (5.29) learn points by the jury (panel test) related to fruit quality were irrigation 80 and 60 percent respectively. Also, there was no signifincant difference between deficit irrigation 80% and irrigation 100% in terms of total phenol content of fruit. The results showed that the fruit harvested from Soski Zand plant grafted on Shintozwa had better quality compared to control plants under deficit irrifation.
Salar Darabi; Nasser Ghaderi; Ario Emamifar
Abstract
Rashe grape cultivar grows in Kurdistan province in rain fed conditions. Microclimate conditions have a great effect on grape berry quality. Information about changes in grape berry composition in the relation to climate changes is limited. In order to measure the effects of slope and altitude on some ...
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Rashe grape cultivar grows in Kurdistan province in rain fed conditions. Microclimate conditions have a great effect on grape berry quality. Information about changes in grape berry composition in the relation to climate changes is limited. In order to measure the effects of slope and altitude on some grape berry chemical composition, a study was conducted on grape cv. ‘Rasheh’ in University of Kurdistan during 2012 and 2013. A randomized complete block design with four treatments (northern and southern slope, low and high altitude) and three replications was used. In this study, amount of carotenoids, anthocyanin, antioxidant capacity, total soluble carbohydrates, tannin and total phenol in grape berry were analyzed. Results showed that southern slope at high altitude increased amount of anthocyanin, antioxidant capacity, phenol and total soluble carbohydrates. Maximum values in the concentration of carotenoid and tannin in grape berry obtained in the northern slope and lower altitude. Berries from Northern slope and lower altitude were found to have a significantly lower anthocyanin and total soluble carbohydrates compared to other treatments. Based on these results, it can be concluded that the planting in the southern slope and higher altitude will help to grape growers for improve the qualitative characteristics of the grape berries.
Mahmoud Ghasemnejad; Roghayeh Ghorban Ali pour; Javad Fattahi Mohgaddam
Volume 13, Issue 1 , August 2011, , Pages 55-64
Abstract
Harvesting time of kiwifruit can influence quality characteristics. The current research was carried out according to a completely randomized design with three replications at Faculty of Agricultural Sciences, University of Guilan in 2009. Weight loss, flesh firmness, total soluble solid (TSS), titritable ...
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Harvesting time of kiwifruit can influence quality characteristics. The current research was carried out according to a completely randomized design with three replications at Faculty of Agricultural Sciences, University of Guilan in 2009. Weight loss, flesh firmness, total soluble solid (TSS), titritable acidity (TA), ascorbic acid, total phenol content and antioxidant capacity of harvested fruit at different times was measured after four months storage at 0.5?C. The results showed that fruit weight loss was significantly increased at the end of storage time when fruits harvested with higher ?brix (more than 6.5). Furthermore, flesh firmness of these fruits was significantly reduced during storage. Delay in harvest was resulted to increase of TSS and TSS/TA. Data showed that total phenols and ascorbic acid increased significantly with delay in harvesting time up to 8.5 and nine °brix, respectively after four months storage at 0.5?C and thereafter declined, however antioxidant capacity was higher when fruits harvested with 6.5 and nine ?brix as compared with other harvesting times. Overall, although delay in harvest might increase antioxidant compounds in kiwifruit but reduced storage quality of fruits.