PJB-2017-592
THE ROLE OF FREE PROLINE AND SOLUBLE CARBONHYDRATES IN WATER GYPSUM STRESS ON SOME GYPSOPHYTE AND GYPSOVAG PLANTS
EBRU OZDENIZ
Abstract
The aim of this study is to exhibit the roles of free proline and soluble carbonhydrates in water gypsum stress. For this purpose, free proline and soluble carbonhydrate contents in gypsophyte (Acantholimon riyatguelii Y?ld?r?m, Thymus leucostomus Hausskn. & Velen var. gypsaceus and Verbascum gypsicola Vural & Aydo?du and gypsovag (Fumana procumbens (Dunal) Gren. & Godr., Onobrychis oxyodonta var. armena (Boiss. & Huet) Aktoklu and Astragalus lydius Boiss. have been analyzed. It is known that proline increases under stress conditions and is a nitrogen-containing compound of protective property contributing to durability to stress conditions. Soluble carbonhydrates accumulating under stress conditions, on the other hand, take on a protective task regulating cell osmotic density. In gypsophytes, free proline is proportionally high (Ch/Pr; 1.5 to 9.3) and amount of soluble carbonhydrate is low. In those individuals of gypsovags growing on gypsum, proline is proportionally low (Ch/Pr; 25.5 to 9.2) but soluble carbonhydrate is high. It is found out that in those individuals of gypsovags growing on mediums other than gypsum, amount of proline increases (Ch/Pr; 11.6 to 8.5), nonetheless, proportion of soluble carbonhydrate decreases. Accordingly, while gypsophytes adapt themselves to high proline amount against to water gypsum stress and gypsovags develop resistance to water gypsum stress with high amount of soluble carbonhydrate, it is observed that such ratio in non-gypsum soils, i.e., Ch/Pr ratio, decreases.
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