بررسي مقاومت به شوري در مرحله جوانه زني و رشد رويشي در چهار گونه از اكاليپتوس

Salinity resistance in germination stage and growth stage in Some Eucalyptus species

Salinity is One of the environmental stresses that impose a reduction or delay in germination and supress establishment and growth of both halophyte and glycophyte plants. This research was carried out to estimate the salinity resistance of four Eucalyptus species: Eucalypus sargentii, E.occidentalis, E. salubris and E. globules at germination phase and seedling growth phase. Five NaCI level (0, 50, 100, 150 and 200 mM) treatments were used in three replication in a factorial experiment design based on completely randomized plots. Radicule length, plumule length, vigour index germination percentage, germination speed and germination index were estimated at germination and seedling stage. Pigments (total chlorophyle, chlorophyle a, b and carotene), soluble sugar, prolin, amas, leaf area, relative water content, water saturation different, specific leaf area and leaf water content per unit leaf area were measured in growing stage on six mounth plant. Increased of salt stress leds to increased prolin, soluble sugar and decreased of pigments and growth parameters in four species. The highest quantity for vigour index and germination speed respectively belonged toE. occidentalis and E. salubris. In growth stage E. sargentii had highest quantity in total chlorophyll, chlorophyll a, carotene, prolin, soluble sugar and leaf area. The lowest quantity in germination and growth stage was belonged to E. globules.