Field Screening of Variation for Heat Tolerance in a Large Set of Sweetpotato Germplasm Accessions
Bettina Heider, Elisa Romero, Stef De Haan
International Potato Centre (CIP), Glocal Program Genetic Resources, Peru
Sweet potato is a robust crop with a wide range of adaptation to agroecological conditions, high yield potential, low input cultivation requirements, effective vegetative propagation and high nutritive value but storage root initiation and growth is adversely affected by temperature. Improved sweetpotato varieties with increased tolerance to heat could improve productivity and allow for the use of more marginal heat prone production areas. Sweet potato landraces and unimproved genotypes represent a valuable resource for heat tolerance in breeding programmes. The International Potato Centre holds the largest in vitro collection worldwide of sweet potato germplasm of which only a fraction has been evaluated for heat tolerance. This vast pool for future adaptative breeding has remained fairly untapped due to the lack of necessary evaluation data. The objective of this on-going study is therefore to screen a representative collection of sweetpotato for key prioritised traits: early bulking and heat tolerance.
Keywords: Abiotic stress, fast screening methods, heat tolerance, NDVI, sweetpotato, thermal imaging
Contact Address: Bettina Heider, International Potato Centre (CIP), Glocal Program Genetic Resources, Av. La Molina 1895, Lima, Peru, e-mail: b.heidercgiar.org