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Drought stress affects physiological parameters but not tuber yield in three Andean potato (<i>Solanum tuberosum</i> L.) cultivars

Rodríguez-Pérez, Loyla and Ñústez L., Carlos Eduardo and Moreno F., Liz Patricia (2017) Drought stress affects physiological parameters but not tuber yield in three Andean potato (<i>Solanum tuberosum</i> L.) cultivars. Agronomía Colombiana, 35 (2). pp. 158-170. ISSN 2357-3732

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Resumen

This study evaluated the effect of water deficit on the physiological response and yield of three Andean potato cultivars. Leaf water potential (Ψw), soil matric potential (SMP), photosynthesis (A), stomatal conductance (gs), transpiration (E), intrinsic water use efficiency (WUEi), leaf temperature (LT), chlorophyll fluorescence parameters, chlorophyll (Chl), carotenoids (Car), electrolyte leakage (EL), growth and yield (Y). Parameters were determined in well-watered (WW) and drought-stressed (DS) plants. The three DS cultivars showed a decrease in leaf Ψw from the first day of treatment and reached values close to -2.00 MPa 4 days after treatment (DAT) for the Diacol Capiro (DC) cultivar, 5 DAT for the Pastusa Suprema (PS) cultivar and 6 DAT for the Esmeralda (Es) cultivar. The values of A, gs and E in the DS cultivars decreased from the first DAT. The LT reached the highest values when gs showed the lowest values for the three DS cultivars. WUEi was higher in Es under DS plants but lower in DC under DS. The PSII photochemical efficiency (Fv/Fm) showed values greater than 0.8 for all DS cultivars under DS, suggesting the absence of non-stomatal limitations for A. The Chl content increased in the Es cultivar under DS from 5 to 7 DAT compared to WW plants. Carotenoids (Ca) contents, the Car/Chl ratio, and EL increased in the three DS cultivars. There were no differences in yield and growth parameters between WW and DS cultivars. These results suggest that the three cultivars developed mechanisms to overcome the stress. One of these mechanisms could be the early synthesis of Car, which may maintain photosystem II function under water stress.

Tipo de documento:Artículo - Article
Palabras clave:carotenoid/chlorophyll ratio, electrolyte leakage, photoprotection, water deficit tolerance, leaf temperature.
Temática:6 Tecnología (ciencias aplicadas) / Technology > 63 Agricultura y tecnologías relacionadas / Agriculture
Unidad administrativa:Revistas electrónicas UN > Agronomía Colombiana
Código ID:69233
Enviado por : Dirección Nacional de Bibliotecas STECNICO
Enviado el día :24 Septiembre 2018 17:34
Ultima modificación:24 Septiembre 2018 17:34
Ultima modificación:24 Septiembre 2018 17:34
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