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http://dx.doi.org/10.5532/KJAFM.2019.21.4.261

Evaluation of Photochemical Reflectance Index (PRI) Response to Soybean Drought stress under Climate Change Conditions  

Sang, Wan-Gyu (National Institute of Crop Science, Rural Development Administration)
Kim, Jun-Hwan (National Institute of Crop Science, Rural Development Administration)
Shin, Pyeong (National Institute of Crop Science, Rural Development Administration)
Baek, Jae-Kyeong (National Institute of Crop Science, Rural Development Administration)
Lee, Yun-Ho (National Institute of Crop Science, Rural Development Administration)
Cho, Jung-Il (National Institute of Crop Science, Rural Development Administration)
Seo, Myung-Chul (National Institute of Crop Science, Rural Development Administration)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.21, no.4, 2019 , pp. 261-268 More about this Journal
Abstract
Climate change and drought stress are having profound impacts on crop growth and development by altering crop physiological processes including photosynthetic activity. But finding a rapid, efficient, and non-destructive method for estimating environmental stress responses in the leaf and canopy is still a difficult issue for remote sensing research. We compared the relationships between photochemical reflectance index(PRI) and various optical and experimental indices on soybean drought stress under climate change conditions. Canopy photosynthesis trait, biomass change, chlorophyll fluorescence(Fv/Fm), stomatal conductance showed significant correlations with midday PRI value across the drought stress period under various climate conditions. In high temperature treatment, PRI were more sensitive to enhanced drought stress, demonstrating the negative effect of the high temperature on the drought stress. But high CO2 concentration alleviated the midday depression of both photosynthesis and PRI. Although air temperature and CO2 concentration could affect PRI interpretation and assessment of canopy radiation use efficiency(RUE), PRI was significantly correlated with canopy RUE both under climate change and drought stress conditions, indicating the applicability of PRI for tracking the drought stress responses in soybean. However, it is necessary to develop an integrated model for stress diagnosis using PRI at canopy level by minimizing the influence of physical and physiological factors on PRI and incorporating the effects of other vegetation indices.
Keywords
Climate change; Photochemical Reflection Index; Photosynthesis;
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