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Is Discrimination of 13C in potato leaflets and tubers an appropriate trait to describe genotype responses to restrictive and well-watered conditions?

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Title Is Discrimination of 13C in potato leaflets and tubers an appropriate trait to describe genotype responses to restrictive and well-watered conditions?
 
Creator Antonio Ramirez Collantes, David
 
Contributor Rolando, Jose Luis
Lorena Yactayo Gabriel, Wendy
Monneveux, Philippe
Quiroz, Roberto
 
Subject carbon stable isotope
carbon isotope discrimination
Potato
 
Description Selection for drought tolerance entails prioritizing plant traits that integrate critical physiological processes occurring during crop growth. Discrimination against 13C (Δ) in leaflets (Δleaflet) and tubers (Δtuber) was compared under two water regimes in two potato-improved varieties selected to maintain yield under drought conditions (Unica and Sarnav) and one drought susceptible European cultivar (D esir ee). In the control treatment, soil water content was kept at field capacity over the whole growth cycle, while in the drought treatment water supply was restricted after tuber initiation (50 % of field capacity). Gas exchange and N content per unit leaf area (Narea) as well as Δ were assessed at different stages. Sarnav showed the highest tuber yield in both water conditions, suggesting that yield in the water restriction treatment was largely driven by yield potential in this genotype. Higher stomatal conductance (gs) and Narea and lower Δleaflet in well-watered Sarnav suggested higher photosynthetic capacity. Under water restriction, Sarnav maintained higher gs indicating that carbon diffusion was a key factor for biomass accumulation under water restriction. Our results suggest the use of Δ determined after tuber initiation as an indirect selection indicator for tuber yield under both well-watered and restricted soil water availability conditions.
 
Date 2015-01-07
2016-04-01T17:33:44Z
2016-04-01T17:33:44Z
 
Type Journal Article
 
Identifier http://onlinelibrary.wiley.com/doi/10.1111/jac.12119/abstract;jsessionid=AF3F74BAC6ABD02772579CDDA4141050.f04t03
https://mel.cgiar.org/reporting/download/hash/cYfpqbKv
David Antonio Ramirez Collantes, Jose Luis Rolando, Wendy Lorena Yactayo Gabriel, Philippe Monneveux, Roberto Quiroz. (7/1/2015). Is Discrimination of 13C in potato leaflets and tubers an appropriate trait to describe genotype responses to restrictive and well-watered conditions. Journal of Agronomy and Crop Science, 201 (6), pp. 410-418.
https://hdl.handle.net/20.500.11766/4607
Open access
 
Language en
 
Rights CC-BY-4.0
 
Format PDF
 
Publisher Wiley
 
Source Journal of Agronomy and Crop Science;201,(2015) Pagination 410,418