Variation of carbon and isotope natural abundances (δ15N and δ13C) of whole-plant sweet potato (Ipomoea batatas L.) subjected to prolonged water stress

Gouveia Carla S.S., Ganança José F.T., Slaski Jan, Lebot Vincent, Pinheiro de Carvalho Miguel A.A.. 2019. Variation of carbon and isotope natural abundances (δ15N and δ13C) of whole-plant sweet potato (Ipomoea batatas L.) subjected to prolonged water stress. Journal of Plant Physiology, 243:153052, 6 p.

https://doi.org/10.1016/j.jplph.2019.153052

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Sweet potato (Ipomoea batatas L.) is an important crop in the world, cultivated in temperate climates under low inputs. Drought changes the plant biomass allocation, together with the carbon and nitrogen isotopic composition (δ13C and δ15N), whose changes are faintly known in sweet potato crops. Here, we show the biomass allocation of eight sweet potato accessions submitted to drought during 3 months, using the δ13C, δ15N, carbon isotope discrimination (Δ13C), total carbon (TC) and water use efficiency (WUE) traits. The tolerant accessions had improved WUE, with higher TPB and TC. Storage roots and shoots had a heavier δ13C content under drought stress, with greater 13C fixation in roots. The Δ13C did not show a significant association with WUE. The δ15N values indicated a generalised N reallocation between whole-plant organs under drought, as a physiological integrator of response to environmental stress. This information can aid the selection of traits to be used in sweet potato breeding programs, to adapt this crop to climate change.

Mots-clés Agrovoc : Ipomoea batatas, patate douce, adaptation aux changements climatiques, stress dû à la sécheresse, cycle du carbone, isotope naturel, résistance à la sécheresse

Mots-clés géographiques Agrovoc : Madère, Canaries (îles), Guinée-Bissau

Mots-clés libres : Ipomoea batatas, Patate douce, Tolérance à la sécheresse, WUE, Isotopes

Classification Agris : F60 - Physiologie et biochimie végétale
P40 - Météorologie et climatologie

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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