Resumo

CARDENAS PIRA, Wendy Tatiana; MORENO FONSECA, Liz Patricia  e  RODRIGUEZ, Luis Ernesto. Water deficit mitigation by calcium application in yellow diploid potato (Solanum tuberosum L. group Phureja). Acta Agron. [online]. 2023, vol.72, n.1, pp.47-54.  Epub 25-Abr-2024. ISSN 0120-2812.  https://doi.org/10.15446/acag.v72n1.93478.

Climate variability causes an increase in drought occurrence, which reduces tuber yield in potato. Therefore, it is necessary to develop strategies for mitigating the water deficit. The objective of this research was to assess the effect of calcium (Ca) applications on physiological parameters and yield of Solanum tuberosum L. group Phureja cultivar Criolla Colombia under water deficit. Seed tubers were planted in bags with soil irrigated at field capacity until tuber initiation. Between 44 and 54 days after sowing (das), Ca was applied in edaphic sources (E): 3 and 4.5 g plant-1 CaCl2, 4.5 and 7 g plant-1 Ca(NO3)2, 6 and 9 g plant-1 Ca(NO3)2+ B, and foliar (F): 10 and 20 mM plant-1 CaCl2, and 10 and 20 m Mplant-1 Ca(NO3)2. At 55 das, the plants were subjected to two water regimes: well-watered (WW) and water deficit (WD) by irrigation suspension for 7 days. WD reduced the relative water content (22.1 %), leaf water potential and tuber yield (26.7%), while the electrolyte leakage increased (97.3 %). Plants with CaCl2-20-F, CaCl2-4.5-E and Ca(NO3)2-7-E presented lower leakage increase (<21.2 %), and higher relative water content (>12.6 %) and tuber yield (>15.6 %), compared to plants without Ca. This indicates a water mitigation deficit at the level of membrane stability and a water status with edaphic and foliar Ca applications, which is probably related to its functions as signaling molecule.

Palavras-chave : relative water content; membrane stability; leaf water potential; tuber yield; tuberization.

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