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:: Volume 6, Issue 22 (10-2015) ::
JPG 2015, 6(22): 1-12 Back to browse issues page
Stress Response of Dominant Forest Tree Species South of the Caspian Sea in Relation to Soil from Coast to Upland
Hassan Zare-Maivan , Farnoosh Lotfi Fard , Zahra Tayebi
Department of Plant Biology, Tarbiat Modares University. Tehran, IR Iran
Abstract:   (1253 Views)
Distribution and growth of plant species is affected by many factors including abiotic (topography,
altitude and soil) and biotic (root symbiosis) factors. In light of global warming, recent findings
advocate microhabitats and micro-conditions of the root zone and canopy ambiance as determining
factors in sustaining of plant populations. Although, occurrence of ectomycorrhizal (ECM) and
non-mycorrhizal plants in forests south of the Caspian Sea have been studied extensively, stress
response of tree species in relation to altitude and soil (texture and contents of heavy metals) has
not been investigated much. This research investigated the antioxidant stress response of three
dominant tree species (Alnus subcordata C.A.Mey, Acer velutinum Boiss. and Carpinus betulus L.)
of three selected hyrcanian forests south of the Caspian Sea (Javaherdeh, Dalkhani and Tonekabon)
at 4 altitudes (sea level, 500, 1000 and 1500 m above sea level). Results showed some nonenzymatic
antioxidants, such as flavonoids and anthocyanins contents correlated with
ectomycorrhizal root colonization, differed amongst trees in corresponding altitudes and was
generally greater in upper altitudes. Activity of antioxidant enzymes like catalase and peroxidase
and total protein content were affected by soil physicochemical factors. A.velutinum grew better in
sandy soils while A.subcordata dominanted clay soils. Although, nutrient status of the soil was
different within each soil type, cation competition between Ca and Mg and high concentration of
Fe in soil most likely affected root performance and consequentially pigment content in leaves,
particularly in upper altitudes where temperatures were low and UV radiation was strong. UV
radiation induces anthocyanin biosynthesis which mainly protects the DNA from damage. In this
research, Chllorophyll/ Carotenoid ratio reduced with increasing altitude perhaps because of
photoprotection.
Keywords: Stress response, Caspian forests, Ectomycorrhiza, Altitude
Full-Text [PDF 176 kb]   (180 Downloads)    
Type of Study: Basic and Original Research | Subject: Marine Biology
Received: 2018/01/14 | Accepted: 2018/01/14 | Published: 2018/01/14
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Zare-Maivan H, Lotfi Fard F, Tayebi Z. Stress Response of Dominant Forest Tree Species South of the Caspian Sea in Relation to Soil from Coast to Upland. JPG. 2015; 6 (22) :1-12
URL: http://jpg.inio.ac.ir/article-1-441-en.html


Volume 6, Issue 22 (10-2015) Back to browse issues page
نشریه علمی پژوهشی خلیج فارس Journal of the Persian Gulf
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