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International Journal of Horticultural Science and Technology، جلد ۸، شماره ۴، صفحات ۳۵۳-۳۶۹
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عنوان انگلیسی Impact of Drought Stress on Photosynthetic Response of Some Pear Species
چکیده انگلیسی مقاله To investigate photosynthetic response of some pear (Pyrus spp.) species to drought stress, a pot experiment was conducted using as factorial experiment based on completely randomized design (CRD) with three replication under greenhouse condition. The factors included five pear species including: P. biossieriana, P. communis, P. glabra, P. salicifolia and P. syriaca and three levels of drought stress [(100%, 60% and 30% of field capacity (FC)]. According to the obtained results, different levels of drought stress significantly restricted morphological and physiological responses in all studied species. Increasing drought stress intensity reduced leaf relative water content (RWC), net photosynthetic rate, stomatal conductance, transpiration rate and intercellular carbon dioxide concentration when compared to their values in control plants. However, root/shoot dry weight ratio, specific leaf weight and stomatal density per unit of area were increased. In P. glabra exposed to severe stress (30% of FC), the values of root/shoot dry weigh ratio (0.85 g), specific leaf weight (23 mg cm-2), stomata density per unit of area, relative water content (73%) and net photosynthetic rate (3.9 µmol CO2 m-2 s-1) were significantly higher than the other species. P. syriaca, P. salicifolia, P. biossieriana and P. communis were placed in the next ranks, respectively based on their response to drought. In conclusion, P. glabra is reported as a more effective species in mitigating the adverse effects of drought by boosting its protective mechanisms than the other pear species.
کلیدواژه‌های انگلیسی مقاله Drought stress, Intercellular carbon dioxide concentration, Net photosynthetic rate, Stomatal conductance
نویسندگان مقاله Lavin Babaei |
Department of Horticulture, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Mohammad Mehdi Sharifani |
Department of Horticulture, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Reza Darvishzadeh |
Department of Agronomy and Plant Breeding, Urmia University, Urmia, Iran

Naser Abbaspour |
Department of Biology, Faculty of Sciences, Urmia University, Urmia, Iran

Mashhid Henareh |
Seed and Plant Improvement Research Department, West Azarbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Urmia, Iran

نشانی اینترنتی https://ijhst.ut.ac.ir/article_82182_2864ac36f16ec0ce8b9a9c50564f87c3.pdf
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