| Resumo: |
ABSTRACT: The aim of this study is to identify the roles of free proline and soluble carbohydrates in water gypsum stress. This study is the first such study on gypsophyte and gypsovag plants. For this purpose, free proline and soluble carbohydrate contents in gypsophyteand gypsovag plants have been analyzed. It is known that proline increases under stress conditions and it is a nitrogen-containing compound with protective properties contributing to durability understress. Soluble carbohydrates accumulating under stress conditions, on the other hand, take on the protective task of regulating cell osmotic density. In gypsophytes, free proline is proportionally high (Ch/Pr:1.5 to 9.3) and the amount of soluble carbohydrates is low. In gypsovag individuals growing on gypsum, proline is proportionally low (Ch/Pr:25.5 to 9.2), but soluble carbohydrates are high. It is found that in gypsovag individuals growing on mediums other than gypsum, the amount of proline increases (Ch/Pr:11.6 to 8.5), but the proportion of soluble carbohydrate decreases. Accordingly, while gypsophytes adapt themselves to high proline amounts in response to water gypsum stress and gypsovags develop resistance to water gypsum stress with high amounts of soluble carbohydrates, it is observed that the Ch/Pr ratio in non-gypsum soils decreases.
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