“Periodo crítico para el rendimiento y la calidad del grano de quinua (chenopodium quinoa willd.) mediante la aplicación de sombra en distintos estados fenológicos, en el sector la Argelia, Loja”.

Quinoa is an Andean grain crop that in recent years has become very important and has expanded worldwide, thanks to its excellent nutritional and adaptability characteristics. In Ecuador it is grown mainly in the highland region with yields that do not exceed 2 t ha-1. The yield of this crop can be affected by multiple stresses; however, in quinoa it is not known which phenological stage is most susceptible to yield and quality loss. Critical period studies are of great importance because they allow the identification of sensitive stages of grain crops, the identification of this in grain yield is a central aspect for the proper management of the crop to obtain higher yields, in addition, it shows a margin of time to improve yield through the manipulation of phenology. Several studies have identified a great variability in the developmental stages associated with this critical period and its duration, this has been detected in several grain crops and the results of one species cannot be extrapolated to others. In the present study, successive discrete 16 day shading periods were used to reduce photosynthetic assimilates available for growth, mimicking the effects of abiotic stresses, to determine the critical period for yield and grain quality, we compared unshaded controls occupying two locally adapted varieties in Ecuador. Yield of the unstressed controls ranged from 3.25 to 5.65 t ha-1, grain protein from 15.44 to 18.38 % and saponin concentration from 0.001 to 0.037 % in Pata de venado and Tunkahuan. Regardless of the growing conditions, the most sensitive period was at - 50 to 500 ºCd after flowering, from the beginning of flowering BBCH 60 to fruit development BBCH 70. The number of grains was the component that explained most of the variation in yield. Post-anthesis shading decreased saponin concentration by 2 to 90 %, while grain protein concentration increased in each of the shadings by 3 to 19 %. Protein yield followed the trend observed in grain yield, but the increase in grain protein concentration partially buffered the effect of post-flowering stress. Key words: Quinoa, Yield components, Seed quality, Stress, Yield determination.

• 1. autor: Villavicencio Sánchez, Edwin Israel (author)
• Format: bachelorThesis
• Język: spa
• Wydane: 2021
• Hasła przedmiotowe: <QUINOA>< COMPONENTES DEL RENDIMIENTO>< CALIDAD DE SEMILLA>< ESTRÉS> <DETERMINACIÓN DEL RENDIMIENTO>
• Dostęp online: https://dspace.unl.edu.ec/jspui/handle/123456789/24449