Jerez María Paz, Ortiz José, Castro Catalina, Escobar Elizabeth, Sanhueza Carolina, Del-Saz Néstor Fernández, Ribas-Carbo Miquel, Coba de la Peña Teodoro, Ostria-Gallardo Enrique, Fischer Susana, Castro Patricio Alejandro, Bascunan-Godoy Luisa
Laboratorio de Fisiología Vegetal, Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile.
Grup de Recerca en Biologia de les Plantes en Condicions Mediterranies, Universitat de les Illes Balears, Carretera de Valldemossa, Palma de Mallorca, Spain.
Front Plant Sci. 2023 Jun 20;14:1070472. doi: 10.3389/fpls.2023.1070472. eCollection 2023.
Willd. is a native species that originated in the High Andes plateau (Altiplano) and its cultivation spread out to the south of Chile. Because of the different edaphoclimatic characteristics of both regions, soils from Altiplano accumulated higher levels of nitrate () than in the south of Chile, where soils favor ammonium (NH ) accumulation. To elucidate whether ecotypes differ in several physiological and biochemical parameters related to their capacity to assimilate and NH , juvenile plants of Socaire (from Altiplano) and Faro (from Lowland/South of Chile) were grown under different sources of N ( or NH ). Measurements of photosynthesis and foliar oxygen-isotope fractionation were carried out, together with biochemical analyses, as proxies for the analysis of plant performance or sensitivity to NH . Overall, while NH reduced the growth of Socaire, it induced higher biomass productivity and increased protein synthesis, oxygen consumption, and cytochrome oxidase activity in Faro. We discussed that ATP yield from respiration in Faro could promote protein production from assimilated NH to benefit its growth. The characterization of this differential sensitivity of both quinoa ecotypes for NH contributes to a better understanding of nutritional aspects driving plant primary productivity.
威尔德是一种原产于安第斯高原（阿尔蒂普拉诺）的本土物种，其种植范围向南扩展到智利。由于这两个地区土壤气候特征不同，阿尔蒂普拉诺的土壤积累的硝酸盐（ ）水平高于智利南部，智利南部的土壤有利于铵（NH ）的积累。为了阐明不同生态型在与硝酸盐和铵同化能力相关的若干生理和生化参数上是否存在差异，将索凯尔（来自阿尔蒂普拉诺）和法罗（来自低地/智利南部）的幼苗在不同氮源（硝酸盐或铵）下培养。进行了光合作用和叶片氧同位素分馏的测量，并进行了生化分析，作为分析植物性能或对铵敏感性的指标。总体而言，虽然铵抑制了索凯尔的生长，但它促进了法罗更高的生物量生产力，并增加了蛋白质合成、氧气消耗和细胞色素氧化酶活性。我们讨论了法罗呼吸产生的ATP产量可以促进从同化铵中产生蛋白质，从而有利于其生长。藜麦这两个生态型对铵的这种差异敏感性的特征有助于更好地理解驱动植物初级生产力的营养方面。
