Asch, F.

Auber, J.

Bonierbale, M.W.

Farfán, E.

Khan, M.A.

Bonierbale, Merideth W.

CGSpace

Tropentag, September 17-19, 2014, Prague, Czech Republic“Bridging the gap between increasing knowledge anddecreasing resources”Does Combining Canopy Reflectance and Canopy TemperatureAllow Identifying Drought Resistance Strategies in Potato?Julia Auber1, M. Awais Khan2, Evelyn Farfan2, Merideth Bonierbale2, Folkard Asch11University of Hohenheim, Inst. of Plant Production and Agroecology in the Tropics and Subtropics,Germany2International Potato Center (IPC), Germplasm Improvement, PeruAbstractChanges in seasonal precipitation patterns lead to variations in water availability fordifferent development stages of agricultural crops. Potato has been classified as sensitiveto even minor drought spells partly due to its shallow root system. Increasing demand forpotatoes and increase of the global production area, increases the need for resistant potatovarieties to seasonal water deficits. Tolerance of potato to drought may comprise a numberof traits representing different strategies, such as deeper rooting for better access to wateror leaf level adaptation to avoid early drought induced senescence. Evaluation of yieldor yield reductions alone does not allow identifying the underlying resistance strategies.Thermographic evaluation of canopy temperature allows estimating stomatal control overtranspirational water losses and changes in crop surface reflectance indicate leaf senescencelevels. Whereas thermography alone allows estimation of leaf surface temperature, onlythe combination with crop surface reflectance provides information on rooting depth. Toevaluate the suitability of this combination as a screening tool for drought resistance inpotato, 56 potato clones from CIP’s advanced breeding population were grown betweenOctober 2013 and February 2014 in a costal arid region of southern Peru. Plants weresubjected to two irrigation treatments: fully watered (340mm per 4 month season) andterminal drought (withholding irrigation 68 days after planting). At 10-day intervals afterwithholding irrigation crop surface reflectance (FieldSpec, ASD) was measured and surfaceinfrared temperature was taken with a thermo camera (B335, FLIR). Rooting depth andyield were determined at harvest.Drought induced genotypic responses in reflectance and leaf temperature in relationto yield reduction and rooting depth will be presented. Potential genotypic strategies fordrought resistance will be evaluated and the potential of the combined measurements asan early screening tool will be discussed.Keywords: Genotypic responses, hyperspectral reflectance, root system, Solanum tuberosum, vege-tation indexContact Address: Folkard Asch, University of Hohenheim, Inst. of Plant Production and Agroecology in the Tropicsand Subtropics, Garbenstr. 13, 70599 Stuttgart, Germany, e-mail: fa@uni-hohenheim.de

Does combining canopy reflectance and canopy temperature allow Identifying drought resistance strategies in potato?

https://cgspace.cgiar.org/bitstream/10568/67111/2/79018.pdf

Does combining canopy reflectance and canopy temperature allow Identifying drought resistance strategies in potato?

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