Impact of Drought Stress on Photosynthetic Response of Some Pear Species
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 352
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شناسه ملی سند علمی:
JR_IJHST-8-4_005
تاریخ نمایه سازی: 13 مرداد 1400
چکیده 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 [(۱۰۰%, ۶۰% and ۳۰% 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 (۳۰% of FC), the values of root/shoot dry weigh ratio (۰.۸۵ g), specific leaf weight (۲۳ mg cm-۲), stomata density per unit of area, relative water content (۷۳%) and net photosynthetic rate (۳.۹ µmol CO۲ m-۲ s-۱) 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.
کلیدواژه ها:
Drought stress ، Intercellular carbon dioxide concentration ، Net photosynthetic rate ، Stomatal conductance
نویسندگان
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
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