Haan, Stef de

Heider, B.

Romero, E.

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Tropentag, September 17-19, 2013, Stuttgart-Hohenheim“Agricultural development within the rural-urban continuum”Field Screening of Variation for Heat Tolerance in a Large Set ofSweetpotato Germplasm AccessionsBettina Heider, Elisa Romero, Stef De HaanInternational Potato Centre (CIP), Glocal Program Genetic Resources, PeruAbstractSweet potato is a robust crop with a wide range of adaptation to agroecological conditi-ons, high yield potential, low input cultivation requirements, effective vegetative propaga-tion and high nutritive value but storage root initiation and growth is adversely affectedby temperature. Improved sweetpotato varieties with increased tolerance to heat couldimprove productivity and allow for the use of more marginal heat prone production areas.Sweet potato landraces and unimproved genotypes represent a valuable resource for he-at tolerance in breeding programmes. The International Potato Centre holds the largestin vitro collection worldwide of sweet potato germplasm of which only a fraction has beenevaluated for heat tolerance. This vast pool for future adaptative breeding has remainedfairly untapped due to the lack of necessary evaluation data. The objective of this on-goingstudy is therefore to screen a representative collection of sweetpotato for key prioritisedtraits: early bulking and heat tolerance.The poster will present the first evaluation data of a large set (1973) of sweetpotatoaccessions presently being cultivated and evaluated for heat tolerance in the coastal de-sert of Northern Peru. Due to the scale of the screening trial non-invasive optical and fastthroughput methods are used to detect the effects of heat on biochemical and physiologicalprocesses. Canopy temperature will be determined by infrared thermal imaging and chlo-rophyll content by using a portable chlorophyll metre measuring Normalized DifferenceVegetation Index (NDVI). Agronomic data (e.g. early bulking, storage root yield, numberof pencil roots, number of marketable roots, harvest index, and dry matter content) will berecorded at harvest. It is expected that NDVI and canopy temperature are correlated tostorage root yields and thus may prove to be useful tools to fast screen for heat toleranceof sweetpotato and ultimately detect existing variation in large germplasm collections.Keywords: Abiotic stress, fast screening methods, heat tolerance, NDVI, sweetpotato, thermal ima-gingContact Address: Bettina Heider, International Potato Centre (CIP), Glocal Program Genetic Resources, Av. LaMolina 1895, Lima, Peru, e-mail: b.heider@cgiar.org

Field screening of variation for heat tolerance in a large set of sweetpotato germplasm accessions.

https://cgspace.cgiar.org/bitstream/10568/57031/1/77576.pdf

Field screening of variation for heat tolerance in a large set of sweetpotato germplasm accessions.

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