Potato response to drought stress: physiological and growth basis

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dc.contributor.author
Gervais, Taylor
Creelman, Alexa
Li, Xiu-Qing
Bizimungu, Benoit
De Koeyer, David
Dahal, Keshav
dc.date.accepted
2021-07-13
dc.date.accessioned
2024-11-06T20:46:19Z
dc.date.available
2024-11-06T20:46:19Z
dc.date.issued
2021-08-12
dc.date.submitted
2021-05-10
dc.description.abstract - en
Drought poses a major challenge to the production of potatoes worldwide. Climate change is predicted to further aggravate this challenge by intensifying potato crop exposure to increased drought severity and frequency. There is an ongoing effort to adapt our production systems of potatoes through the development of drought-tolerant cultivars that are appropriately engineered for the changing environment. The breeding of drought-tolerant cultivars can be approached through the identification of drought-related physiological and biochemical traits and their deployment in new potato cultivars. Thus, the main objective of this study was to develop a method to identify and characterize the drought-tolerant potato genotypes and the related key traits. To achieve this objective, first we studied 56 potato genotypes including 54 cultivars and 2 advanced breeding lines to assess drought tolerance in terms of tuber yield in the greenhouse experiment. Drought differentially reduced tuber yield in all genotypes. Based on their capacity to maintain percent tuber yield under drought relative to their well-watered controls, potato genotypes differed in their ability to tolerate drought. We then selected six genotypes, Bannock Russet, Nipigon, Onaway, Denali, Fundy, and Russet Norkotah, with distinct yield responses to drought to further examine the physiological and biochemical traits governing drought tolerance. The drought-induced reduction in tuber yield was only 15–20% for Bannock Russet and Nipigon, 44–47% for Onaway and Denali, and 83–91% for Fundy and Russet Norkotah. The tolerant genotypes, Bannock Russet and Nipigon, exhibited about a 2–3-fold increase in instantaneous water-use efficiency (WUE) under drought as compared with their well-watered controls. This stimulation was about 1.8–2-fold for moderately tolerant genotypes, Onaway and Denali, and only 1.5-fold for sensitive genotypes, Fundy, and Russet Norkotah. The differential stimulation of instantaneous WUE of tolerant and moderately tolerant genotypes vs. sensitive genotypes was accounted for by the differential suppression of the rates of photosynthesis, stomatal conductance, and transpiration rates across genotypes. Potato genotypes varied in their response to leaf protein content under drought. We suggest that the rates of photosynthesis, instantaneous WUE, and leaf protein content can be used as the selection criteria for the drought-tolerant potato genotypes.
dc.identifier.citation
Gervais, T., Creelman, A., Li, X.-Q., Bizimungu, B., De Koeyer, D., & Dahal, K. (2021). Potato response to drought stress: Physiological and growth basis. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.698060
dc.identifier.doi
https://doi.org/10.3389/fpls.2021.698060
dc.identifier.issn
1664-462X
dc.identifier.uri
https://open-science.canada.ca/handle/123456789/3113
dc.language.iso
en
dc.publisher - en
Frontiers Media S.A.
dc.rights - en
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.rights - fr
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.rights.openaccesslevel - en
Gold
dc.rights.openaccesslevel - fr
Or
dc.rights.uri - en
https://creativecommons.org/licenses/by/4.0/
dc.rights.uri - fr
https://creativecommons.org/licenses/by/4.0/deed.fr
dc.subject - en
Agriculture
Science and technology
dc.subject - fr
Agriculture
Sciences et technologie
dc.subject.en - en
Agriculture
Science and technology
dc.subject.fr - fr
Agriculture
Sciences et technologie
dc.title - en
Potato response to drought stress: physiological and growth basis
dc.type - en
Article
dc.type - fr
Article
local.acceptedmanuscript.articlenum
698060
local.article.journaltitle - en
Frontiers in Plant Science
local.article.journalvolume
12
local.peerreview - en
Yes
local.peerreview - fr
Oui
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