Masoomeh Amerian; Ali Reza Khosravi
Abstract
In order investigate the effect of salinity and selenium on seed germination of three medicinal plants dragons head, alyssum and chicory, this study was performed as a factorial experiment based on a complete randomized design with two factors including different levels of salinity and selenium in three ...
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In order investigate the effect of salinity and selenium on seed germination of three medicinal plants dragons head, alyssum and chicory, this study was performed as a factorial experiment based on a complete randomized design with two factors including different levels of salinity and selenium in three replications. The first factor included 0, 2, 4, and 8 mM NaCl and the second factor was 0, 5, 10, and 20 mg L-1 sodium selenate levels. Unlike selenium, salinity reduced germination percentage, germination characteristics and initial growth in all three medicinal plants. The germination percentage of chicory was 40%, alyssum was 49.1% and dragons head was 52.5%, which indicates that chicory is more sensitive to salinity stress, while dragons head showed more tolerance to salinity stress. With increasing selenium concentration, seedling length in all three medicinal plants increased compared to the control. The highest seedling length (20 mm) was observed in treatment 20 mg L-1 sodium selenate with a concentration of 8 mM NaCl in alyssum. The lowest seedling length was in chicory (6.2 mm) and in 0 mg L-1 sodium selenate treatment with 8 mM NaCl. The use of selenium can improve germination characteristics and to some extent reduce the effects of salinity stress. In general, it can be concluded that selenium (at the level of 20 mg L-1 of sodium selenate) can increase seed germination and seedling growth of all three medicinal plants under salinity stress.
Sh. Shahmoradi; F. Hamidi; K.S. Asilan; S. Mansourifar
Abstract
Environmental stress is the main effect reducing plant growth and development especially in germination stage. The aim of this project was to determine the threshold for salt stress tolerance in germination stageand mature plant in barley (Hordeum vulgare L.) genotypes and evaluate the relation between ...
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Environmental stress is the main effect reducing plant growth and development especially in germination stage. The aim of this project was to determine the threshold for salt stress tolerance in germination stageand mature plant in barley (Hordeum vulgare L.) genotypes and evaluate the relation between indices. First, the LD50 test was conducted for salt stress tolerance using NaCl, then probit analyze was done. The reaction of seven selected genotypes from barley and three cultivars were assessed in four levels of salinity and drought stress. Factorial experiment was conducted in a randomized complete block design with four replications. Based on probit analysis, the LD50 for salinity stress was 18 ds/m. Salt stress germination experiment included control, 9, 18 and 27 ds/m levels. Principal component analysis showed that at two levels of moderate and moderate stress in germination experiments (9 and 18 dS / m) that the salinity concentration was close to field conditions, in vitro tolerance indices and The field showed a close relationship. This relationship was not observed at severe stress levels (27 ds/m). Overall, the results showed that genotypes TN4807, KC70173, TN6141 and Nosrat cultivar had higher tolerance to germination conditions (9 and 18 ds/m) and field conditions.
lila moradi; raouf seyed sharifi
Abstract
In order to study the effects of plant growth promoting rhizobacteria (PGPR) and salinity stress on seed germination parameters, K and Na content of rye (Secale cereal L.) seedling , two factorial experiments based on CRD and RCB design were conducted with three replications at laboratory and greenhouse ...
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In order to study the effects of plant growth promoting rhizobacteria (PGPR) and salinity stress on seed germination parameters, K and Na content of rye (Secale cereal L.) seedling , two factorial experiments based on CRD and RCB design were conducted with three replications at laboratory and greenhouse respectively at faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabil in 2016. Experimental factors were included soil salinity in four levels (no-salt as control, salinity 25, 50 and 75 mM as NaCl) and seed inoculation with plant growth promoting rhizobacteria in four levels (no inoculation as control, inoculation with Pseudomonas, Azosprilium, both application of Pseudomonas and Azosprilium). The results showed that maximum germination components (such as ridicule and plumule length, radicule and plumule dry weight, germination percentage, uniformity of germination) were obtained at co-application of Pseudomonas and Azosprilium under non-saline condition and minimum of these parameters were obtained at 75 Mm NaCl and no inoculation. K/Na ratio in root and shoot were decreased with increasing salinity level. It was vise versa in seed inoculation with plant growth promoting rhizobacteria. Maximum ratio of Na/K was obtained at the highest level salinity and no inoculation seed with PGPR and minimum of it was obtained in both inoculation with Pseudomonas and Azosprilium and the least level of salinity. It seems that application of PGPR can be used as a proper method for increasing K /Na ratio, germination components and seedling growth of rye under salinity stress.
