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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Partial repair of salinity-induced damage to sprouting sugarcane buds by proline and glycinebetaine pretreatment
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Partial repair of salinity-induced damage to sprouting sugarcane buds by proline and glycinebetaine pretreatment

机译：脯氨酸和甘氨酸甜菜碱预处理对盐度引起的甘蔗芽萌芽的部分修复

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Sugarcane shows reduced crop stand under relatively suboptimal conditions; the main reason for this is its sensitivity to ionic stress in the soil solution. This research was performed to explore some physiological and developmental changes in the immature sugarcane buds submitted to salt stress and possible role of glycinebetaine (GB) and proline (Pro) in mitigating the ion toxicity in a time course manner. Salinity stress reduced fresh and dry weight, induced the generation of hydrogen peroxide, increased tissue levels of Na+ sand Cl-, reduced K+ and Ca2+, and K+:Na+ and Ca2+:Na+ ratios, while increasing the osmolyte synthesis in expanding sugarcane buds. Salinity stress reduced and delayed the formation of new bud leaves and their expansion, which was mainly because of reduction in the number and area of mesophyll cells and poor development of vascular bundles. The pretreatment of bud chips with 20 mM each of GB and Pro decreased tissue levels of Na+ and Cl-, reduced the generation of H2O2, improved K+ and Ca2+, K+:Na+ and Ca2+:Na+ ratios, and further increased the levels of GB, free proline (FP), and soluble sugars in the buds. The pretreatment increased mesophyll cell number and expansion of bud leaves and formation of elaborated vascular tissues, which apparently enabled the sprouting buds to adapt to salinity stress. Of the two osmolytes, GB was a relatively better inducer of salinity tolerance than Pro. In short, salinity-induced oxidative stress was the main cause for altered tissue development, the production of which was offset by pretreatment of bud tissues with Pro and GB.
机译：在相对欠佳的条件下，甘蔗表现出减产的趋势。其主要原因是其对土壤溶液中离子应力的敏感性。进行这项研究是为了探索未成熟甘蔗芽在盐胁迫下的一些生理和发育变化，以及甘氨酸甜菜碱（GB）和脯氨酸（Pro）在缓解离子毒性方面的可能作用。盐分胁迫降低了鲜重和干重，诱导了过氧化氢的产生，Na +沙Cl-的组织水平增加，K +和Ca2 +以及K +：Na +和Ca2 +：Na +的比例降低，同时增加了膨胀甘蔗芽中的渗透压合成。盐分胁迫减少并延迟了新芽叶片的形成和扩展，这主要是由于叶肉细胞的数量和面积减少以及维管束发育不良所致。对GB和Pro分别进行20 mM芽芽预处理可降低Na +和Cl-的组织水平，减少H2O2的产生，改善K +和Ca2 +，K +：Na +和Ca2 +：Na +的比例，并进一步增加GB的水平，游离脯氨酸（FP）和芽中的可溶性糖。预处理增加了叶肉细胞的数量和芽叶的扩张以及形成的维管组织的形成，这显然使发芽的芽能够适应盐分胁迫。在这两种渗透液中，GB比Pro更耐盐度。简而言之，盐度诱导的氧化应激是组织发育改变的主要原因，其产生被Pro和GB预处理芽组织所抵消。

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