SUMMARYIn order to understanding the changes in morpho-physiological traits of wheat cultivars released from 1940 to 2000 in Iran and to determine the association of these traits with grain yield, an experiment was conducted with 15 wheat cultivars released over the past 60 years using an randomized complete block design with four replications. The experiment was conducted on an experimental farm of Arsanjan Islamic Azad University in 2005/6 and 2006/7. Results indicated that cultivar grain yield was significantly correlated with year of release over the 60 years (r = 0.878, p < 0.01). Harvest index and biological yield increased significantly with increasing grain yield. The change in the photosynthesis rate was not significant during this period but transpiration rate and stomatal conductance and chlorophyll index increased significantly. Among yield components, grain number per ear increased significantly but increase in ear number was not significant. Plant height decreased significantly in new cultivars. In conclusion the results showed that wheat yield improvement in Iran is associated with increasing harvest index, grain number per ear, transpiration rate, stomatal conductance and decreasing plant height.

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In order to evaluate the effect of CO 2 elevation and UV radiation on growth responses of zinnia, petunia, coxcomb, and marigold, a study was conducted in 2015 at Arsanjan Islamic Azad University, Iran. The experimental design was factorial arranged in completely randomized design with three replications. Treatments were included four ornamental species (zinnia, petunia, coxcomb, and marigold), CO 2 concentration at two levels (350 and 700 ppm), and UV radiation at two levels (with and without UV radiation). Results showed that elevating of CO 2 concentration from 350 ppm to 700 ppm increased morphological and physiological characters of C 3 plants, especially marigold. Meanwhile, increasing CO 2 concentration from 350 ppm to 700 ppm, decreased effects of UV damage on plants' morphological and physiological characters. The highest leaf number, shoot dry mass, plant height and water use efficiency of C 4 plant (coxcomb flower) were observed at 350 ppm of CO 2 concentration without UV radiation while, the highest leaf number, shoot dry mass and leaf pigments of C 3 plants (zinnia, petunia, and marigold flower) were obtained at 700 ppm of CO 2 concentration without UV radiation. The results showed that the activity of catalase and peroxidase enzymes under UV radiation was increased in all of plants. Overall, it is concluded that, the recognition of plants resistant to UV radiation and high levels of CO 2 concentration in the future may be better for environmental production and distribution as ornamental plants in town landscapes, where ecophysiological traits should be considered. Rezultati so pokazali, da je povečana koncentracija CO 2 iz 350 ppm na 700 ppm povečala vrednosti morfoloških in fizioloških znakov C 3 rastlin, še posebej žametnice. Povečanje koncentracije CO 2 iz 350 ppm na 700 ppm je zmanjšalo učinke poškodb po UV v morfoloških in fizioloških znakih. Največje število listov, največja masa suhe snovi in največja učinkovitost izrabe vode so bili pri C 4 rastlinah (petelinji greben) zabeleženi pri 350 ppm CO 2 brez UV sevanja, pri C 3 rastlinah (cinija, petunija in žametnica) je bila največja vrednost znakov kot so število listov, suha masa poganjkov in vsebnost listnih pigmetov ugotovljena pri 700 ppm CO 2 brez UV sevanja. Aktivnosti katalaze in peroksidaze sta se v razmerah UV sevanja povečali pri vseh rastlinah. V splošnem lahko zaključimo, da je pri izbiri okrasnih rastlin za učinkovitejše ozelenjevanje urbanih površin potrebno upoštevati tudi njihove morfološko fiziološke lastnosti.Ključne besede: okrasne rastline; morfološko fiziološke lastnosti; klimatske spremembe; UV sevanje Hamidreza MIRI et al.