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首页> 外文期刊>AoB PLANTS >Growth and physiological adaptation of whole plants and cultured cells from a halophyte turf grass under salt stress
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Growth and physiological adaptation of whole plants and cultured cells from a halophyte turf grass under salt stress

机译：盐胁迫下盐生植物草坪草的整个植物和培养细胞的生长和生理适应性。

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Understanding the mechanisms used by halophytic members of the Poaceae to cope with salt stress will contribute to the knowledge necessary to genetically engineer salt-tolerant crops. In this study, we identified a genotype of Sporobolus virginicus, a halophytic turf grass collected in Japan, and investigated its growth rate, ion concentration and secretion, and proline concentration in comparison with the reported properties of genotypes collected from the USA, South Africa and Egypt. Surprisingly, the Japanese genotype showed a salinity tolerance up to 1.5 M NaCl, a 3-fold higher concentration than seawater salinity. Shoot growth was stimulated by 100 mM NaCl and root growth was stimulated at salinities of up to 1 M NaCl. Accumulation of Na+ and CI? in shoots and roots was rapidly elevated by salinity stress but did not exceed the levels required for osmotic adjustment, due in part to ion secretion by salt glands, which are present in genotypes of S. virginicus. However, the Japanese genotypes accumulated K+ to a higher level than other genotypes, resulting in a relatively high K+/Na+ ratio even under salinity stress. An increase in proline concentration was observed that was proportional to the NaCl concentration in the culture solution and might partially account for osmotic adjustment in the shoots. We also generated and characterized cultured cells of S. virginicus. In 500 mM NaCl, the cultured cells showed an enhanced growth compared with cultured cells of rice. The concentration of Na+ and CI? in the cultured cells in 300–500 mM NaCl was lower than in 100 mM NaCl. Cultured cells of S. virginicus accumulated proline to higher levels than rice cells cultured under salinity stress. The active regulation of Na+, Cl? and K+ influx/efflux and proline accumulation might be involved in salt tolerance mechanisms at the cellular level as well as in planta.
机译：了解禾本科盐生植物应对盐胁迫的机制，将有助于对耐盐作物进行基因工程改造。在这项研究中，我们确定了日本产的一种盐生草皮草Sporobolus virginicus的基因型，并与从美国，南非和美国采集的基因型的报道特性进行了比较，调查了其生长速率，离子浓度和分泌以及脯氨酸浓度。埃及。出人意料的是，日本基因型显示出最高1.5 M NaCl的盐度耐受性，其浓度比海水盐度高3倍。 100 mM NaCl刺激芽生长，盐分高达1 M NaCl刺激根生长。盐分胁迫使芽和根中Na + 和CI ？的积累迅速增加，但未超过渗透调节所需的水平，部分原因是盐分离子的分泌腺，存在于维吉尼亚链球菌的基因型中。但是，日本的基因型积累的K + 的水平高于其他基因型，导致即使在低热量条件下，K + / Na + 的比率也相对较高。盐度压力。观察到脯氨酸浓度的增加与培养液中NaCl的浓度成比例，并且可能部分解释了芽中的渗透调节。我们还生成并鉴定了维氏链球菌的培养细胞。在500 mM NaCl中，与水稻培养细胞相比，培养细胞显示出增强的生长。在300–500 mM NaCl中，培养细胞中Na + 和CI ？的浓度低于100 mM NaCl。与在盐胁迫下培养的水稻细胞相比，维吉尼亚链球菌的培养细胞积累脯氨酸的水平更高。 Na + ，Cl ？和K + 内向/外向流和脯氨酸积累的主动调节可能参与细胞水平的耐盐机制以及植物中。

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