چكيده لاتين :
The effect of water stress on Triticum aestivum L. was investigated before and during a period of
stress at the seedling stage. For this pwpose Turkish bread wheat cultivar Gonen 98 was used in this research.
Changiug of proline and lipid peroxidation content (malonyl dialdeliyde, MDA) at five different liarvestiug times
(7, 14, 21, 28 and 35 days after sowing) during early vegetative stage was determined in relation to dry matter
production and relative water content of leaves. After onset of stress treatment (14 days after sowing) decline
of dry matter production by water stress was observed. The decreasing of relative water content and increasing
of proline concentration of stressed plants harvested 28 days after sowing was markedly more than at other
harvesting times. Water stress caused an increase of J\1DA content in leaves of plants. It reached highest level
28 days after sowing. The data showed that proline accumulation increased after lipid peroxidation content
became higher and relative water content of leaves became lower. Therefore proline appeared to be mainly
involved in protection against oxidative stress than osmotic adjustment during initial steps of water stress.
