Canopy-Level Photochemical Reflectance Index from Hyperspectral Remote Sensing and Leaf-Level Non-Photochemical Quenching as Early Indicators of Water Stress in Maize

Remote Sensing

Holly Croft¹  Qin Shi²  Jing M. Chen³  Bin Chen³  Shuren Chou³  Hua Yu³  Xiuying Zhang³  Meng Li⁴  Shoaib Khalid⁵ 

[1] Department of Geography and Program in Planning, University of Toronto, Toronto, ON M5S 3G3, Canada;Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China;Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China;School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;

关键词: non-photochemical quenching;    photochemical quenching;    photochemical reflectance index;    water stress;    soil moisture;   

DOI  :  10.3390/rs9080794

来源: DOAJ

【 摘 要 】

In this study, we evaluated the effectiveness of photochemical reflectance index (PRI) and non-photochemical quenching (NPQ) for assessing water stress in maize for the purpose of developing remote sensing techniques for monitoring water deficits in crops. Leaf-level chlorophyll fluorescence and canopy-level PRI were measured concurrently over a maize field with five different irrigation treatments, ranging from 20% to 90% of the field capacity (FC). Significant correlations were found between leaf-level NPQ (NPQleaf) and the ratio of chlorophyll to carotenoid content (Chl/Car) (R2 = 0.71, p < 0.01) and between NPQleaf and the actual photochemical efficiency of photosystem II (ΔF/Fm′) (R2 = 0.81, p < 0.005). At the early growing stage, both canopy-level PRI and NPQleaf are good indicators of water stress (R2 = 0.65 and p < 0.05; R2 = 0.63 and p < 0.05, respectively). For assessment of extreme water stress on plant growth, a relationship is also established between the quantum yield of photochemistry in PSII (ΦP) and the quantum yield of fluorescence (ΦF) as determined from photochemical quenching (PQ) and non-photochemical quenching (NPQleaf) of excitation energy at different water stress levels. These results would be helpful in monitoring soil water stress on crops at large scales using remote sensing techniques.

【 授权许可】

Unknown