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Seasonal Changes of Water Relations Parameters of the Korean Mistletoe (Viscum album var. coloratum) Leaves  

Lee, Kyeong-Cheol (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Kim, Cheol-Woo (Korea Forest Research Institute)
Yi, Jae-Seon (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Han, Sang-Sup (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Publication Information
Journal of Korean Society of Forest Science / v.101, no.3, 2012 , pp. 461-468 More about this Journal
Abstract
This study was conducted to study the seasonal changes of relative water relations parameters by pressure-volume curves of Korean mistletoe (Viscum album var. coloratum) leaves for understanding ecological characteristics. In growing season, the osmotic potentials at full turgor (${\Psi}_o^{sat}$) and at incipient plasmolysis (${\Psi}_o^{tlp}$) decreased, while increased the maximum bulk elastic modulus of the cell wall ($E_{max}$) and relavive water content ($RWC^{tlp}$). Korean mistletoe in Quercus variabilis and Korean mistletoe in Quercus mongolica in November showed best maximum perssure potential (${\Psi}_{P,\;max}$). Pressure potential (${\Psi}_P$) and water potential (${\Psi}_L$) in Korean mistletoe in Quercus variabilis were rapidly decreased with decreasing of relative water content. The values of $RWC^{tlp}$ in November were all above 84% showing that the function of osmoregulation is somewhat better, and symplastic water content (Vo/DW) and maximum water content (Vt/DW) were variable seasonally. Thus, responses to water relations of Korean mistletoe in Quercus variabilis and Korean mistletoe in Quercus mongolica such as ${\Psi}_o^{sat},\;{\Psi}_o^{tlp},\;E_{max},\;{\Psi}_{P,\;max},\;RWC^{tlp}$ showed increaing drought tolerance with increasing of leaf aging.
Keywords
drought-tolerance; maximum perssure potential; osmoregulation; Korean mistletoe; water relations parameters;
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