Salinity is the most important abiotic stress that influences the crops production in large areas of the country. To evaluate the Salt tolerance of different alfalfa ecotypes, an experiment was conducted with three replications in a factorial randomized complete block design in 2014, in College of Agricultural and Natural Resources University of Tehran. 25 alfaalfa ecotypes in hydroponics (Hoagland solution) condition and applied salinity levels 100 and 200 mM sodium chloride with irrigation water were examined. The results indicated that the interaction of salinity and different ecotypes was significant on shoot dry weight, concentration of sodium and potassium. To determine tolerant and sensitive ecotypes indicators of stress were used and the results showed that in non-stress condition yield to MP (mean productivity), TOL (tolerance), STI (stress tolerance index) indicators and in Salt stress yield to MH (Harmonic mean), STI, YI (Yield index) had positively significant correlation. According to this ecotypes 5 and 21 as the most tolerant and ecotype 20 and 8 as more sensitive were introduced. The result of the Biplot analysis showed that the first and second principal components justified 87/15 precent of the whole yield changes. Hence, the selection due to the first and second principal components respectively led to choose the tolerant and sensitive ecotypes.

This experiment was conducted for investigation of Salt tolerance in alfalfa varieties in green house. Six varieties (Renger , Rehnani , Hamadani . Maopa , Bami and Yazdi ) and six level of salinity (control, -03, -0.6, -0.9. -1.1 and -1.3 Mpa3 ) in a factorial design with four replication were used. In this experiment used pot that fi1!ed with distil1 water tow times. In this experiment green house temperature were about 25±5 cantigrad degree and relative humedity between 70 to 80 percent In water potential -1.1 and -1.3 Mpa all plants were die because Salt concentration were excess around the roots. Leaf area affected by water potential and varieties that in the all sampling this effects were significant Effects of varieties on shoot dry matter in all sampling were significant but effect of water potential in three sampeling , vere significant Effect of varieties and water potential were significant on height with decrease in water potential, plant height were decrease too. In those water potential -0.3 , -06 and -09 Mpa, decrease in plant height relation to control were 17.9 .36.8 and 54.7 percent. The effect of variety and water potential on plant water potential were significant. It was concluded that Renger and Rehnani varieties in al1 properties salin condition have superiority relation to other and Maopa variety were sensitive to salinity.

Millets are important agricultural crops for arid regions due to short life span and their resistance to salinity and drought conditions, In Iran, three main species of millets including proso millet (Panicum miliaceum), foxtail millet (Setaria italica) and pearl millet (Pennisetum glaucum) are cultivated in Shouthem Khorasan province, eastem Iran, In order to assess inter-specific genetic variation for Salt tolerance at vegetative and reproductive stage, an experiment was conducted in split plot based on completely randomized block design. Nine genotypes of these millets collected from four different regions of the Shouthem Khorasan province (Ghaen, Sarayan, Nehbandan, and Birjand) were subjected to three levels of salinity stress (1.5, 5.5, and 9.5 dS/m). Although the yield and other yield related parameters of millets decreased by salinity stress, this reduction was more prominent only at high level of salinity (9.5 dS/m). Remarkable differences among same species from different areas were observed. Growth and yield capacity of three millet species from Birjand were also different. Of three millets, pearl millet from Bitjand followed by foxtail millet, showed maximum yield potential under both Salt stress and normal conditions. Of genotypes of foxtail millets, genotype from Sarayan exhibited maximum growth and yield potential under saline conditions. In contrast in proso-millets, genotype from Ghaen showed higher Salt tolerance. Thus, Salt tolerance varies in three millets from different regions, which could be further explored in future research.

Salt stress is considered as a restricting factor for plant products. Various species have different levels of tolerance to Salt stress. In this research seeds of Millet (Panicum miliaceum L.), cultivars (Talkhonche, Shiraz and Isfahan) were put in Petri dishes under 0, 200, 300 and 400 mg/lit concentrations of NaCl in the same light condition for one week. The seeds of Millet after sterilization were treated by different concentrations of NaCl and after germination some physiological traits were determined in treated 1 week old seedlings. Our results showed that salinity increased fresh and dry weight of shoot, fresh weight of root and chlorophyll content in Talkhonche cultivar, and in Isfahan cultivar these parameters and dry weight of root were decreased. In Shiraz cultivar, fresh and dry weight of shoot and fresh weight of root increased by salinity. Results of this study showed that Talkhonche cultivar was Salt resistance; Shiraz cultivar semi-resistance and Isfahan cultivar was Salt sensitive in seedling stage.

In order to evaluate for Salt tolerance, 823 accessions from bread wheat collection of National Plant Gene-Bank of Iran were studied. The evaluation of genetic materials was performed under Salt stress in research field of Ardekan, Yazd with soil and irrigated water salinity of 10 to 12 dsm-1 in an augmented design with three check cultivars. Grain yield of five spikes and number of tillers had the largest diversity based on coefficient of variation, 27.99 and 24.13, respectively. In principal component analysis the first seven components comprised 69.18% of the total variation. The first principal component emphasized on grain weight of five spikes, number of seeds per spike, number of spikelets per spike and number of florlets per spikelets and distinguished acessions 3528 (unknown origin from Iran), 3477 (Khorasan), 4056 (Kerman), 3532 (Markazi, 3569 (Lorestan) and 3444 (Khorasan). Cluster analysis was performed through K means method and located the accessions in five groups. In Group two, 38 accessions had higher grain yield of five spikes, 100 seed weight and number of seeds per spike than Kavir. In group five, three accession, 3228 (Khorasan), 4436 (India) and 5415 (Greece) had higher grain yield of five spikes, 100 seed weight and number of seeds per spike than Roshan and Mahooti. The total results of the research indicated high genetic diversity and possibility of selection for Salt stress within bread wheat genetic resources.