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Heat stress lowers yields, alters nutrient uptake and changes seed quality in quinoa grown under Mediterranean field conditions
Journal of Agronomy and Crop Science ( IF 3.5 ) Pub Date : 2021-04-18 , DOI: 10.1111/jac.12495
Javier Matías 1 , María José Rodríguez 2 , Verónica Cruz 1 , Patricia Calvo 2 , María Reguera 3
Affiliation  

The global expansion of quinoa (Chenopodium quinoa Willd.) cultivation has been related to the nutritional properties of its seeds and the ability of this crop to cope with stress. However, research works evaluating the agronomic impact of quinoa cultivation out of the Andean region are still limited, especially under Mediterranean field conditions. In this work, the agronomic performance, seed composition and nutrient uptake (NU) of five quinoa varieties were analysed in two consecutive years (2017–2018) under field conditions in Southwestern Europe. High temperatures were recorded during 2017 growing season, resulting in significantly lower yields (1.6 t/ha) compared to 2018 (2.5 t/ha). High-temperature stress coincided with flowering stage in those medium-to-long cycle varieties and was well correlated with detrimental effects on the vegetative stage of short and medium cycle varieties. Seed composition and mineral content of quinoa varied among varieties subjected to heat stress, which could be due to differences in the stress response. Protein and fibre contents were higher under high temperatures, while fats and carbohydrates contents decreased. Nutrient uptake, utilisation and partitioning were reduced under heat stress, probably due to heat-protection mechanisms and associated biochemical changes. Early maturing varieties showed better adaptation, especially Marisma, which achieved the highest yield in both years (3.0 t/ha, on average). Overall, the results here presented support to the potential of quinoa cultivation in Europe highlighting the necessity to further explore varieties better adapted to elevated temperatures, a common stress affecting the Mediterranean area.

中文翻译:

热应激降低了地中海田间条件下种植的藜麦的产量,改变了养分吸收并改变了种子质量

藜麦(藜麦藜麦)的全球扩张Willd。)的种植与其种子的营养特性以及该作物应对压力的能力有关。但是,评估藜麦种植在安第斯地区以外的农艺影响的研究工作仍然有限,特别是在地中海田间条件下。在这项工作中,连续两年(2017-2018年)在西南欧的田间条件下分析了五个藜麦品种的农艺表现,种子组成和养分吸收(NU)。2017年生长季节记录到高温,导致单产(1.6吨/公顷)与2018年(2.5吨/公顷)相比明显降低。那些中长周期品种的高温胁迫与花期同时发生,并且与中短周期品种的营养期的有害影响密切相关。藜麦的种子组成和矿物质含量在遭受热胁迫的品种之间有所不同,这可能是由于胁迫反应的差异所致。高温下蛋白质和纤维含量较高,而脂肪和碳水化合物含量下降。在热胁迫下,养分的吸收,利用和分配减少了,这可能是由于热保护机制和相关的生化变化所致。早熟品种表现出更好的适应性,尤其是马瑞斯玛(Marisma),两年均达到最高产量(平均3.0吨/公顷)。总的来说,这里的结果为欧洲藜麦种植的潜力提供了支持,突显了进一步探索更适应高温的品种的必要性,这种高温是影响地中海地区的共同压力。
更新日期:2021-05-19
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