Heidar Meftahizade; Zahra Rahmati Ahmadabad
Abstract
Guar (Cyamopsis tetragonoloba L.), is an annual plant of the legume family. The gum of this plant, which is actually extracted from the seed endosperm, is used in various industries. Germination and seedling growth indices are among the most important indicators for selecting salinity tolerant genotypes. ...
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Guar (Cyamopsis tetragonoloba L.), is an annual plant of the legume family. The gum of this plant, which is actually extracted from the seed endosperm, is used in various industries. Germination and seedling growth indices are among the most important indicators for selecting salinity tolerant genotypes. In this study, the effects of 4 salinity levels (such as: 0, 80, 150 and 220 mM) on germination characteristics and preliminary seedling growth (including percentage and rate of germination, seed vigor, etc.) of ten genotypes and guar seed selection were investigated. The results showed that salinity treatment, genotype and interactions of genotype × salinity on seed vigor index, root length, shoot length, seedling length were significant at 1% probability level. Mean comparisons showed showed that RGC-1008 had the highest percentage and germination rate and Saravan had the lowest percentage and germination rate. Mean comparison of salinity levels showed that the control had the highest (2.23cm) and the 150 mM treatment has the lowest shoot length (1.47cm). RGC-1038 and Bampour with 395.3 and 414.73 showed the highest seed vigor respectively, and Saravan with 68.32 showed the lowest seed vigor. In general, RGC-1008 can be a suitable candidate to cultivate in salinity stress after affecting other agronomic treatments.
Samira Moghadam; Saeideh Maleki Farahani; Samar Khayamim
Abstract
To evaluate the effect of salinity stress on seed germination and screening of sugar beet genotypes, 20 polygerm and 15 sugar beet drought tolerant genotypes were separately tested in between paper and rapid germination test in Erlen under control and 20 dSm-1. Also they were tested in rapid germination ...
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To evaluate the effect of salinity stress on seed germination and screening of sugar beet genotypes, 20 polygerm and 15 sugar beet drought tolerant genotypes were separately tested in between paper and rapid germination test in Erlen under control and 20 dSm-1. Also they were tested in rapid germination test in Erlen and green house experiment under control and 16 dSm-1 in factorial experiments based on completely randomized designs with four replicates. Salinity stress in rapid germination test decreased germination index over drought tolerant and polygerm sugar beet genotypes about 80 and 90%, respectively in comparison to normal. Rapid germination test in Erlen was found to be better and more suitable in comparison of sugar beet genotypes under salinity in comparison to between paper tests. Genotypes which had more field emergence potential in laboratory had more total dry weights in green house under salinity condition. There was positive and significant correlation between fast germination tests in EC=20 and 16 dSm-1, so it seems that the rapid germination method in Erlen in EC=16 dSm-1 is more efficient to evaluate sugar beet genotypes under saline conditions
