Abstract
Two potato clones (S. tuberosum L.) were grown in the field under contrasting temperature regimes during the crop cycle. Differential growth and yield was observed in the clones studied. Differences in yield were due to the decreased proportion of tubers larger than 3.5 cm in length as well as to the differences in dry weight and percent of dry matter in tubers. Yield reductions per plant were 52 and 94% for Alfa and Herta, respectively, in the warmer regime compared with the cooler regime. Apparent photosynthesis rates measured in Herta were maximum (45 umol.m−2.s−1) during tuber filling. Stomatal resistance and apparent photosynthesis rate were reduced by high temperature, indicating mesophyllic inhibition of photosynthesis. Dark respiration was promoted by moderately high temperature and differed significantly between clones, with Herta showing the higher rates.
Compendio
Dos clones de papa (S. tuberosum L.) fueron cultivados en campo bajo condiciones contrastantes de temperatura durante el ciclo de cultivo. Se observó una reducción diferencial del crecimiento y del rendimiento. La diferencia en rendimiento se debió a la disminución en la proporción de tubérculos mayores de 3.5 cm de largo y a la diferencia en peso seco y porcentaje de materia seca en los tubérculos. La disminución del rendimiento por planta fue 52 y 94% para Alfa y Herta, respectivamente, en la localidad más cálida, en comparación con la más templada. Las máximas tasas de fotosíntesis aparente se observaron en Herta (45umol.m−2.s−1), durante el llenado de tubérculos. La resistencia estomática y la tasa fotosíntetica se vieron reducidas por la temperatura elevada, indicando inhibición mesofílica de fotosíntesis. La respiratión oscura fue promovida por temperatura moderadamente elevada y varió significativamente entre clones, con Herta siendo el que mostró las tasas más elevadas.
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This work was funded by proyect DGAPA 209193 and by SABRITAS S.A. de C.V.
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Sarquís, J.I., González, H. & Bernal-Lugo, I. Response of two potato clones (S. tuberosum L.) to contrasting temperature regimes in the field. American Potato Journal 73, 285–300 (1996). https://doi.org/10.1007/BF02855207
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DOI: https://doi.org/10.1007/BF02855207