جستجوی مقالات مرتبط با کلیدواژه "پایه gf677" در نشریات گروه "علوم پایه"

Among abiotic stresses, soil and water salinity are the major factors affecting agricultural crops growth and productivity worldwide. On the other hand, the scion-rootstock combination and also foliar application of chimical compounds as salicylic acid can affect the nutrient elements content of almond leaf under salinity conditions. Therefore, in this study, the effects of foliar application of salicylic acid at 0, 1 and 2 mM concentrations on the changes of leaf nutrient elements (nitrogen, phosphorus, potassium, sodium, chlorine, calcium, magnesium, manganese, copper, zinc and iron) of three almond cultivars (Shokoufeh, Sahand, and Touno) grafted on GF677 and GN rootstocks under salinity stress of irrigation water (0, 2, 6 and 8 dS m-1) was evaluated based as factorial based on a completely randomized design with three replications. The results showed that salinity stress, especially at the highest concentration (8 dS m-1) significantly enhanced sodium, chlorine, potassium and calcium content and also reduced nitrogen, phosphorus, magnesium, manganese, zinc and iron content in plant leaves. Grafted cultivars on the different rootstocks showed different responses to salinity stress and foliar application of salicylic acid. Generally, GF677 rootstock reduced sodium content and enhanced nitrogen, phosphorus, calcium, magnesium, copper, zinc and iron in the leaves of grafted cultivars. Furthermore, foliar application of salicylic acid significantly reduced leaves sodium content of different almond cultivars. Overall, in this experiment, which was performed under controlled conditions, GF677 rootstock as well as foliar application of salicylic acid was more effective in modifying the adverse effects of salinity than other treatments. Of course, it is necessary to study these treatments in orchard conditions as well.

In order to evaluate the tolerance of some almond genotypes to salinity a pot experiment was carried out with 3 factors; cultivar in 11 levels including Touno, Nonparaeil, Mamaie, Shokofeh, Sahand, Fragness, 1- 16, 1-25, A200,13-40 and GF677 and salinity in five levels including 0, 1.2, 2.4, 3.6 and 4.8 g/l of sodium chloride with electrical conductivity 0.5, 2.5, 4.9, 7.3 and 9.8 ds/m, respectively; during 30, 60 and 90 days in 2013. The results showed that salinity stress affected the young trees through increasing the amount of minimum fluorescence (FO) and decreasing the maximum fluorescence (Fm) and reducing variable fluorescence (Fv) as well as the ratio of variable fluorescence to maximum fluorescence from 0.83 in the control plants to 0.72 in the upper leaves and 0.70 in the bottom leaves of Sahand and GF677. The result of morphological characteristics showed that GF677 was tolerated to water salinity up to 4.9 ds/m; however, higher range of salinity had negative impact on the above factors. Also, the results revealed that salinity stress duration is a key factor causeing several visible damages. Overall, according to morphological characteristics and leaves visual damages and chlorophyll fluorescence parameters, Feragness and Sahand cultivars were the most tolerant and sensitive genotypes to salinity stress, respectively.