en fr Contribution of high-resolution remotely sensed thermal-infrared imagery to high-throughput field phenotyping of an apple progeny submitted to water constraints Contribution de limagerie infrarouge thermique infrarouge à hReportar como inadecuado




en fr Contribution of high-resolution remotely sensed thermal-infrared imagery to high-throughput field phenotyping of an apple progeny submitted to water constraints Contribution de limagerie infrarouge thermique infrarouge à h - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 MONTP UMR SOL ENVI - Science du sol et environnement 2 CSIC - Consejo Superior de Investigaciones Científicas Spain 3 UMR TETIS - Territoires, Environnement, Télédétection et Information Spatiale

Abstract : The genetic variability of fruit trees in response to drought stress is scarcely studied. As adaptation of scion cultivars to abiotic constraints constitutes a new challenge for fruit production, in particular where water scarcity is likely to occur, development of high-throughput phenotyping strategies applicable in the field to assess the tree response to soil drought among large populations is needed, overcoming the limitations of usual in-planta measurements. In this research, remotely sensed images were acquired by ultra-light aircraft ULA and an unmanned aerial vehicle UAV during 4 years in a field trial where an apple progeny 122 hybrids was studied under contrasted summer irrigation regimes. Ortho-images were simultaneously acquired in visible RGB, near-infrared NIR and thermalinfrared TIR bands. After rthorectification, georeferencing and mosaicking, RGB and NIR images were used to compute different vegetation indices over the field trial, while TIR imaging allowed extraction of the vegetation surface temperature Ts, which was calibrated at ground level by using hot and cold reference targets. The Morans-f water deficit index WDI, which combines the surface minus air temperature Ts-Ta and the normalized difference vegetation index NDVI, was used as a stress phenotypic variable. WDI estimates the ratio of actual to maximal evapotranspiration WDI=1.ETact-ETmax in discontinuous plant covers. Like the Ts-Ta variable, it significantly discriminated the tree water statuses and genotypes. On the basis of different plant- and image-based indices, individual tree behaviour trends isohydric vs. anisohydric can be distinguished among the progeny, irrespective of tree vigour. This opens potential applications for plant breeding, and genetic bases of apple tree response to water stress are currently investigated through quantitative trait locus QTL detection. Making use of ULA with flights performed at 40-60 m altitude made it possible to strongly improve the TIR image resolution -10 cm and to limit the number of vegetation-soil mixed pixels. However, it will require careful image posttreatment, possibly including classification and-or segmentation.

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Keywords : remote sensing high spatial resolution imagery drought stress

Mots-clés : TEMPERATURE DE SURFACE DEFICIT EN EAU INFRAROUGE THERMIQUE IMAGERIE STRESS HYDRIQUE TELEDETECTION HAUTE RESOLUTION SPATIALE





Autor: N. Virlet - D. Gomez Candon - V

Lebourgeois - S. Martinez - A. Jolivot - P.E. Lauri - E. Costes - S. Labbe - J Regnard -


Fuente: https://hal.archives-ouvertes.fr/



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