Effect of Soil Water Availability on Physiological Parameters, Yield, and Seed Quality in Four Quinoa Genotypes (Chenopodium quinoa Willd.)

Drought represents significant environmental stress, and improving agriculture water management yield is a priority goal. The effect of diminishing soil content in the grain filling (GF) stage, throughout physiological maturity (GM), on quality, leaf potential (LWP), maximum quantum (Fv/Fm) four long photoperiod quinoa genotypes was evaluated South-Central zone Chile, during 2014–2015 2015–2016 seasons. Five irrigation treatments (T) were established. Irrigation carried out when available (AW) root reached values 100%, 70%, 40%, 20%, 0%. lowest LWP obtained by T20 T0 (?1.95 MPa). ‘Morado’ genotype at both seasons, while highest average achieved ‘AG 2010’ (2014–2015) ‘Cahuil’ (2015–2016). A global trend Fv/Fm observed from GF to GM: 0.74 toward 0.79 (2014/2015), 0.82 (2015/2016). Only second season, showed differences among treatments. Total yields season (2.97 t ha?1) greater than those first (1.43 ha?1). In T100 yields. significative decrease AW diminished. direct relationship between seed (?Y/?LWP) found all genotypes, varying 5.53 (‘Cahuil’) 2.86 ha?1 MPa?1 (‘AG 2010’). proteins, albumins, globulins varied with almost no slight obtain higher total protein It possible grow under deficit conditions GM, maintaining parameters nutritional quality.