Effect of water stress during grain filling on yield, quality and physiological traits of illpa and rainbow quinoa (Chenopodium quinoa Willd.) cultivars
Keywords: 
Leaf abscisic acid; Quinoa yield and quality; Quinoa varieties; Stomatal closure; Water deficit
Quinoa yield and quality
Quinoa varieties
Stomatal closure
Water deficit
Issue Date: 
2019
ISSN: 
2223-7747
Note: 
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license
Citation: 
Morales, F.; Aranjuelo, I.; García-Mina-Freire, J. (José María); et al. "Effect of water stress during grain filling on yield, quality and physiological traits of illpa and rainbow quinoa (Chenopodium quinoa Willd.) cultivars". Plants. 8 (6), 2019, 173
Abstract
The total area under quinoa (Chenopodium quinoa Willd.) cultivation and the consumption of its grain have increased in recent years because of its nutritional properties and ability to grow under adverse conditions, such as drought. Climate change scenarios predict extended periods of drought and this has emphasized the need for new crops that are tolerant to these conditions. The main goal of this work was to evaluate crop yield and quality parameters and to characterize the physiology of two varieties of quinoa grown under water deficit in greenhouse conditions. Two varieties of quinoa from the Chilean coast (Rainbow) and altiplano (Illpa) were used, grown under full irrigation or two different levels of water deficit applied during the grain filling period. There were no marked differences in yield and quality parameters between treatments, but the root biomass was higher in plants grown under severe water deficit conditions compared to control. Photosynthesis, transpiration and stomatal conductance decreased with increased water stress in both cultivars, but the coastal variety showed higher water use efficiency and less discrimination of C-13 under water deficit. This response was associated with greater root development and a better stomatal opening adjustment, especially in the case of Rainbow.

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