Abstract：
: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.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Gouveia CSS,Ganança JFT,Slaski J,Lebot V,Pinheiro de Carvalho MÂAdoi
10.1016/j.jplph.2019.153052subject
Has Abstractpub_date
2019-12-01 00:00:00pages
153052eissn
0176-1617issn
1618-1328pii
S0176-1617(19)30175-0journal_volume
243pub_type
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