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- Title
Harvest index combined with impaired N availability constrains the responsiveness of durum wheat to elevated CO[sub 2] concentration and terminal water stress.
- Authors
Erice, Gorka; Sanz-Sáez, Alvaro; Urdiain, Amadeo; Araus, Jose L.; Irigoyen, Juan José; Aranjuelo, Iker
- Abstract
Despite its relevance, few studies to date have analysed the role of harvest index (HI) in the responsiveness of wheat (Triticum spp.) to elevated CO[sub 2] concentration ([CO[sub 2]]) under limited water availability. The goal of the present work was to characterise the role of HI in the physiological responsiveness of durum wheat (Triticum durum Desf.) exposed to elevated [CO[sub 2]] and terminal (i.e. during grain filling) water stress. For this purpose, the performance of wheat plants with high versus low HI (cvv. Sula and Blanqueta, respectively) was assessed under elevated [CO[sub 2]] (700 mmol mol[sup -1] vs 400 mmol mol[sup -1] CO[sub 2]) and terminal water stress (imposed after ear emergence) in CO[sub 2] greenhouses. Leaf carbohydrate build-up combined with limitations in CO[sub 2] diffusion (in droughted plants) limited the responsiveness to elevated [CO[sub 2]] in both cultivars. Elevated [CO[sub 2]] only increased wheat yield in fully watered Sula plants, where its larger HI prevented an elevated accumulation of total nonstructural carbohydrates. It is likely that the putative shortened grain filling period in plants exposed to water stress also limited the responsiveness of plants to elevated [CO[sub 2]]. In summary, our study showed that even under optimal water availability conditions, only plants with a high HI responded to elevated [CO[sub 2]] with increased plant growth, and that terminal drought constrained the responsiveness of wheat plants to elevated [CO[sub 2]].
- Subjects
DURUM wheat; EFFECT of carbon dioxide on plants; WHEAT; PHYSIOLOGICAL effects of carbon dioxide; CARBOHYDRATES
- Publication
Functional Plant Biology, 2014, Vol 41, Issue 11, p1138
- ISSN
1445-4408
- Publication type
Article
- DOI
10.1071/FP14045