Author/Authors :
Eshraghi-Nejad، Morteza Eshraghi-Nejad نويسنده , , Mohamadi Todashki، Mohammad Reza نويسنده University of Agriculture and Natural Resources of Ramin, Khozestan , , Amoo Zad Khalili، Zohreh نويسنده University of Agriculture and Natural Resources of Ramin, Khozestan ,
Abstract :
ABSTRACT: Silybummarianum(Milk thistle), an annual medical plant. Seed germination ability is important for optimum stand establishment. Salinity is a determining factor for seed germination. Seed priming has been successfully demonstrated to improve germination and emergence in seeds of many crops and can be effectively improved germination, seedling growth and seedling vigour index of the seeds. In order to evaluation of seed priming on seed germination of milk thistle an experiment was done with five levels of priming (1:control (without any priming), 2: hydropriming for 24 h, 3: 100 mmol ZnSo4, 4: 200 mmol ZnSo4, 5: 400 mmol Znso4) and seven levels of salinity (0, 25, 100, 150, 250, 350 mmolnacl). The results showed that effects of treatments and their interaction on maximum germination (Gmax), Germination uniformity (GU), Germination rate (R50), Stem length (SL), Root length (RL), and vigour index (VI) were significant. Base on LSD test; hydro priming has the best maximum germination (33.43 %) at all levels of salinity treatments. The best equations that can be used for prediction of Gmax, SL, RL, and VI under salinity stress are the segmented model. With increasing of salinity up to 50 mmolNaCl (turning point X0=50), Gmax, RL and VI also increased with slope b1=0.2821, 0.0376 and 4.5402, respectively, and after that decreased with b2= -0.1484, -0.0174 and -1.2345, respectively. The coefficients of correlation among the traits of germination rate, germination index, root length, shoot length and seed vigor under salt stress were all positively significant at the level of P < 0.01 and P < 0.05. Our ?ndings revealed seed treatments especiallyhydropriming gave better Performance (Gmax) than control (untreated) under salt stresses. Hydrated seeds with higher germination percentage under salt stresses represent a potential saving of much money per ha. It also increased tolerance of seeds to salt and water stress.
