چکیده:
Physiological effect of five levels of water stress (0,-0.3,-6,-9 and -1.2MP) was studied on seed germination and tigella as well as radicule growth length in two different Artemisia species namely: Artemisia spicigera and Artemisia fragrans. Polyethylene glycol (PEG) was used to provide appropriate water potentials. A total of 50 seeds were sown from each Artemisia species. Experimental design was a factorial one of complete randomized design. Maximum germination rate was obtained at -0.3 MP. Germination rate, and tigella & radicule growth lengths declined with decreasing water potential level. Artemisia spicigera was more resistant to water stress in comparison with Artemisia fragrans.
خلاصه ماشینی:
"2MP) was studied on seed germination and tigella as well as radicule growth length in two different Artemisia species namely: Artemisia spicigera and Artemisia fragrans.
Germination rate, and tigella & radicule growth lengths declined with decreasing water potential level.
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.
Maginz (1960) studied water stress in Lolium prenne and concluded that germination percent and rate, tigella and radicule length decrease with reduction in water potential.
spp seed germination and concluded that germination rate and tigella length decrease with water potential reduction (Saeedian, F.
It is aimed in this study to determine water stress resistance during the germination period of Artemisia spicigera and Artemisia fragrans.
The interaction of different treatments and studied species in germination period and in radicule length was not significant but it was significant for tigella length within two probability levels of 1% and 5%.
4. Conclusion The results of this research indicated that germination rate, radicule and tigella length decrease with reduction in water potential.
Javadi (2003) studied three species of Salsola and concluded that germination rate, tigella and radicul length decrease whit increasing water stress rate.
The plants that are resistant and have higher rate of radicul and tigella growth during the germination period, exhibit higher resistance to water stress in other stages of growth too (Basra, A."