چکیده:
Physiological effect of six levels of water stress (0, -0.1, -.03, -0.6, -0.9 and -1.2 MP) was studied on seed germination
and plumule as well as radicule growth length in three species namely: Agropyron elongatum, Agropyron desertourm and
Secale montanum. Polyethylene glycol (PEG) was used to provide appropriate water potentials. A total of 100 seeds in
four replications (Petri dishes) were sown from each species. Experimental design was a factorial one of complete
randomized design. Maximum germination rate was obtained at 0 MP. Germination rate and plumule and radicule growth
declined with water potential level. The most resistance species to water stress are Secale montanum, Agropyron
elongatum and Agropyron desertorum respectively.
خلاصه ماشینی:
ir DESERT 17 (2013) 249-253 Effect of Water Stress on Seed Germination of Agropyron Elongatum, Agropyron Desertourm & Secale Montanum E.
2 MP) was studied on seed germination and plumule as well as radicule growth length in three species namely: Agropyron elongatum, Agropyron desertourm and Secale montanum.
Water stress affects different aspects of plant growth (morphology, physiology and anatomy) and causes many changes such as decrease or delay in germination, aerial organ growth reduction, decrease in dry biomass and in rate of growth, etc (Garwood, E.
Many researches have been studying the germination of agricultural plant species while there are few studies on the germination of rangeland plant species as below: Maginz (1960) studied water stress in Lolium prenne and concluded that percentage and rate of germination, tigella and radicule length would be decreased with reduction in water potential.
Qi and Redman, (1993) studied the seed germination and seedling survival of C3 and C4 grasses under water stress and pointed out that Bouteloua gracilis had the most germination rate.
Conclusion The results of this research indicated that germination rate, radicule and plumule length decreased with reduction of water potential and Secale montanum had the most percentage of germination.
Javadi (2003) studied three species of Salsola and concluded that germination rate, radicule and plumule length decreased with the increase of water stress rate.
Investigation on water stress effect on seed germination of two rangeland species.
Investigation on water stress effect on seed germination of two rangeland species.
, 2003, Investigation on water stress effect on seed germination of three rangeland species, Desert Journal, 15:2:121-130.