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http://dx.doi.org/10.7783/KJMCS.2012.20.3.171

Comparison of Photosynthetic Responses in Allium microdictyon Prokh and Allium ochotense Prokh from Atmosphere-Leaf Vapor Pressure Deficit (VPD)  

Lee, Kyeong-Cheol (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Kim, Ha-Sun (Forest Research Institute of Kangwon Province)
Noh, Hee-Sun (Specialty Crops Experiment Station, Gangwon Agricultural Research & Extension Services)
Kim, Jongh-Wan (Specialty Crops Experiment Station, Gangwon Agricultural Research & Extension Services)
Han, Sang-Sup (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Publication Information
Korean Journal of Medicinal Crop Science / v.20, no.3, 2012 , pp. 171-176 More about this Journal
Abstract
This study was conducted to investigate the effect of atmosphere-leaf vapor pressure deficit (VPD) in Allium microdictyon Prokh. and Allium ochotense Prokh. The vapor pressure deficit (VPD) was rapidly increased with increasing temperature and decreasing relative humidity. Taken as a whole, the stomatal transpiration reaction was slightly late with increading of VPD. Maximum photosynthetic rate at high-VPD condition was 5.98 ${\mu}mol$ $CO_2{\cdot}m^{-2}{\cdot}s^{-1}$ in Allium microdictyon, which was a little lower than 6.59 ${\mu}mol$ $CO_2{\cdot}m^{-2}{\cdot}s^{-1}$ in Allium ochotense, respectively. After 2 p.m, stomatal transpiration of Allium microdictyon at the high VPD condition were rapidly decreased. Ci/Ca began to decline sharply at 8 a.m and showed the lowest value at 2 p.m, The results showed that Ci/Ca decreased with being used $CO_2$ in the mesophyll intercellular space for photosynthesis. In high VPD condition, The water potential values showed the highest at 5 a.m, and the lowest at 1 p.m in high VPD condition. The water saturation deficits (WSD) in high VPD condition showed about 1.5 times higher than in low VPD condition. The results indicated that physiological activities in Allium microdictyon is more limited from high VPD conditions.
Keywords
Allium microdictyon; Allium ochotense; Stomatal Transpiration; Water Potential; Vapor Pressure Deficit;
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Times Cited By KSCI : 5  (Citation Analysis)
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