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Analyzing Changes in Maize Leaves Orientation due to GxExM Using an Automatic Method from RGB Images

Plant Phenomics 2023年第2期5卷 239-252页

作者： Mario Serouart Raul Lopez-Lozano gaëtan daubige Maëva Baumont Brigitte Escale Benoit De Solan Frédéric Baret Arvalis Institut du végétal228route de l’aérodrome-CS 4050984914 Avignon Cedex 9France INRAE Avignon UniversitéUMR EMMAHUMT CAPTE228route de l’aérodrome-CS 4050984914 Avignon Cedex 9France Arvalis Ecophysiology21 Chemin de Pau64121 MontardonFrance

The sowing pattern has an important impact on light interception efficiency in maize by determining the spatial distribution of leaves within the *** orientation is an important architectural trait determining maize canopies light *** studies have indicated how maize genotypes may adapt leaves orientation to avoid mutual shading with neighboring plants as a plastic response to intraspecific *** goal of the present study is 2-fold:firstly,to propose and validate an automatic algorithm(Automatic Leaf Azimuth Estimation from Midrib detection[ALAEM])based on leaves midrib detection in vertical red green blue(RGB)images to describe leaves orientation at the canopy level;and secondly,to describe genotypic and environmental differences in leaves orientation in a panel of 5 maize hybrids sowing at 2 densities(6 and 12 plants.m^(−2))and 2 row spacing(0.4 and 0.8 m)over 2 different sites in southern *** ALAEM algorithm was validated against in situ annotations of leaves orientation,showing a satisfactory agreement(root mean square[RMSE]error=0.1,R^(2)=0.35)in the proportion of leaves oriented perpendicular to rows direction across sowing patterns,genotypes,and *** results from ALAEM permitted to identify significant differences in leaves orientation associated to leaves intraspecific *** both experiments,a progressive increase in the proportion of leaves oriented perpendicular to the row is observed when the rectangularity of the sowing pattern increases from 1(6 plants.m^(−2),0.4 m row spacing)towards 8(12 plants.m^(−2),0.8 m row spacing).Significant differences among the 5 cultivars were found,with 2 hybrids exhibiting,systematically,a more plastic behavior with a significantly higher proportion of leaves oriented perpendicularly to avoid overlapping with neighbor plants at high *** in leaves orientation were also found between experiments in a squared sowing pattern(6 plants.m^(−2),0.4 m

关键词： cultivar spacing pattern

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Scoring Cercospora Leaf Spot on Sugar Beet:Comparison of UGV and UAV Phenotyping Systems

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Plant Phenomics 2020年第1期2卷 225-242页

作者： S.Jay A.Comar R.Benicio J.Beauvois D.Dutartre G.daubige W.Li J.Labrosse S.Thomas N.Henry M.Weiss F.Baret INRAE UMR 114 EMMAHUMT CAPTEF-84914 AvignonFrance HIPHEN SAS 84000 AvignonFrance ARVALIS-Institut du végétal 84000 AvignonFrance Florimond Desprez 59242 Capelle-en-PévèleFrance

Selection of sugar beet(Beta vulgaris L.)cultivars that are resistant to Cercospora Leaf Spot(CLS)disease is critical to increase *** selection requires an automatic,fast,and objective method to assess CLS severity on thousands of cultivars in the *** this purpose,we compare the use of submillimeter scale RGB imagery acquired from an Unmanned Ground Vehicle(UGV)under active illumination and centimeter scale multispectral imagery acquired from an Unmanned Aerial Vehicle(UAV)under passive *** variables are extracted from the images(spot density and spot size for UGV,green fraction for UGV and UAV)and related to visual scores assessed by an *** show that spot density and green fraction are critical variables to assess low and high CLS severities,respectively,which emphasizes the importance of having submillimeter images to early detect CLS in field *** sensitivity to CLS can then be accurately retrieved based on time integrals of UGV-and UAV-derived *** UGV shows the best estimation performance,UAV can show accurate estimates of cultivar sensitivity if the data are properly *** and limitations of UGV,UAV,and visual scoring methods are finally discussed in the perspective of high-throughput phenotyping.

关键词： illumination millimeter critical

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