Taher Saghali; Mohamd Esmail Amiri; Ali Imani; Hamed Rezaei; Ali Momenpour
Abstract
Almond has a high sensitivity to salt stress. Selection of a tolerant rootstock/scion is one of the ways to reduce the negative effects of salinity stress. In this experiment, the effects of salinity stress on some morphological, physiological and nutritional traits of some almond rootstocks was investigated ...
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Almond has a high sensitivity to salt stress. Selection of a tolerant rootstock/scion is one of the ways to reduce the negative effects of salinity stress. In this experiment, the effects of salinity stress on some morphological, physiological and nutritional traits of some almond rootstocks was investigated in a factorial experiment based on completely randomized design with two factors (8 levels of rootstock/scion compositions and five levels of salinity) in three replications at Horticultural Research Institute in 2017. The results showed that by increasing salinity from zero to 8 ds/m, the highest and lowest amount of reduction in root dry weight was observed in ‘Shahrood 12’/Tetra (37.8%) and GN15 (14.5%), respectively. The lowest and highest dry weight loss in the main branch was observed in the bitter almond seedling (38.2%) and ‘Shahrood 12’/ GN15 (47.9%), respectively. The highest amount of necrosis was observed in bitter almond seedling (28.98%) and the lowest value was in ‘Shahrood 12’/GF677 (9.9%). The lowest and highest changes in electrolyte leakage occurred at the rootstock of GF677 (30.74%) and GN15 (42.93%). The lowest and the highest changes in sodium were observed in the ‘Shahrood 12’/GF677 (51.2%) and in the bitter almond seedling (82%), respectively. The results also showed that by increasing salinity stress, the amount of root and leaf nutrient elements increased initially and then decreased with increasing salinity levels. Based on the results, ‘Shahrood 12’/GF677 is the most tolerable combination and the ‘Shahrood12’ grafted on bitter almond seedling is the most sensitive to salt stress.
Sajjad Fattahi; Mehdi Saidi; Mohammad Javad Zarea
Abstract
In order to evaluate morphological and physiological responses of lettuce plants inoculated/ non-inoculated with Piriformospora indica under salinity stress, a factorial experiment based on randomized complete block design (RCBD) with three replications was carried out under greenhouse condition. The ...
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In order to evaluate morphological and physiological responses of lettuce plants inoculated/ non-inoculated with Piriformospora indica under salinity stress, a factorial experiment based on randomized complete block design (RCBD) with three replications was carried out under greenhouse condition. The main factor was consisted of inoculated or non-inoculated seeds with the fungus and the sub-factor included three levels of irrigation water salinity (tap water with EC=0.8 dS/m as control and saline water with ECs of 4 and 8 dS/m). Salinity stress significantly decreased most of growth parameters and P. indica declined the adverse effects of salinity. An increase in fresh foliage weight and leaf area observed for plants inoculated with P. indica. These plants showed less leaf damage symptoms under stress condition. Inoculation by the fungus significantly increased the volume and the length of root in comparison with control plants. Inoculated plants contained higher concentration of proline, photosynthetic pigments and catalase enzyme activity in their leaves rather than control plants. The lowest ionic leakage was observed in P. indica-inoculated plants at EC=4 dS/m. The results revealed the usefulness of P. indica fungus in production of lettuce under salinity stress up to 4 dS/m. But inoculation with the fungus did not lead to desirable results at 8 dS/m.
Lotfali Saadeghi-Azar; Shahab Madah Hoseini; Asghar Rahimi; Ali Akbar Mohammadi Mirik
Abstract
To investigate the effects of salinity stress on some germination and vegetative growth indices of lentil (Lens culinaris Medic) genotypes, two separate experiments were conducted at glasshouse and laboratory of College of Agriculture, Vali-e-Asr University of Rafsanjan. In the first one, three electrical ...
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To investigate the effects of salinity stress on some germination and vegetative growth indices of lentil (Lens culinaris Medic) genotypes, two separate experiments were conducted at glasshouse and laboratory of College of Agriculture, Vali-e-Asr University of Rafsanjan. In the first one, three electrical conductivities (including one, three and seven dS.m-1) were applied on germinating seeds of seven accessions and two cultivars of lentil and germination indices were investigated. In the second experiment, same salinities were applied on soils of pots on the same genotypes. After four weeks, dry mass and leaf areas were measured. Results showed that germination percentage, radical to plumule ratio, leaf area and dry matter per plant reduced with increasing in salinity levels; however there was no significant difference between EC= 4 and 7, except for germination percentage. On the other hand, considerable genotypic variation was observed in response to salinity in both stages but there was no significant correlation between tolerance to salinity in germination and vegetative growth phases. In the situation of this study, it seems that damage to growth at germination and vegetative phase induced by EC= 7 was relatively higher than EC=4.