Effect of warm temperature and water shortages on early growth of Lepidium meyenii Walpers
Efecto de la temperatura cálida y el déficit hídrico en el crecimiento temprano de Lepidium meyenii Walpers
DOI:
https://doi.org/10.15446/rfnam.v77n2.108243Keywords:
Andean crop, Climate change , Maca, Seedlings, Temperature (en)Cultivo andino, Cambio climático , Maca, Plántulas, Temperatura (es)
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Increasing water deficits and warming temperatures due to climate change threaten agricultural systems in the Peruvian Andes, where environmental conditions are themselves challenging. Lepidium meyenii Walpers also known as "maca" is an endemic root crop that can tolerate adverse conditions such as low temperatures and high UV radiation, but little is known about its response to drought. This study aimed to test the effect on maca germination and early seedling growth of water restriction under two maximum temperatures: 15 °C (current scenario) and 20 °C (warming scenario). Water restriction had either a direct or a temperature-dependent effect on germination and above ground seedling growth, which was greater at 15 °C. By contrast, its effects on seedlings growing at 20 °C were completely overcome by faster germination, initial growth, and biomass acquisition. The results are consistent with those from other crops and contribute to the understanding of how climate change is affecting high-mountain agriculture.
El aumento de los déficits de agua y las temperaturas más cálidas debido al cambio climático amenazan los sistemas agrícolas en los Andes peruanos, donde las condiciones ambientales son desafiantes. Lepidium meyenii Walpers, también conocida como “maca”, es un cultivo de raíz endémico que puede tolerar condiciones adversas como bajas temperaturas y alta radiación ultravioleta, pero se sabe poco sobre su respuesta a la sequía. El objetivo de este estudio fue evaluar el efecto de la restricción hídrica sobre la germinación de maca y el crecimiento temprano de las plántulas en dos temperaturas máximas: 15 °C (escenario actual) y 20 °C (escenario de calentamiento). Se encontró que la restricción hídrica tuvo un efecto directo o dependiente de la temperatura sobre la germinación y el crecimiento foliar de las plántulas, que fue mayor a 15 °C. Por el contrario, sus efectos sobre las plántulas que crecieron a 20 °C fueron completamente superados por una germinación más rápida, crecimiento inicial y adquisición de biomasa. Los resultados son consistentes con los de otros cultivos y contribuyen a la comprensión de cómo el cambio climático está afectando a la agricultura de alta montaña.
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