Photosynthetica 2019, 57(4):1053-1065 | DOI: 10.32615/ps.2019.123

Epiphytic orchids Stanhopea tigrina and Prosthechea cochleata are differentially affected by drought in a subtropical cloud forest

C.I. GUEVARA-PÉREZ1, P. DELGADO-SÁNCHEZ2, J.A. TORRES-CASTILLO1, J.D. FLORES-RIVAS3, G. MENDIETA-LEIVA5, E. DE LA ROSA-MANZANO1
1 Autonomous University of Tamaulipas, Institute of Applied Ecology, Gulf Division Av. 356, 87019 Victoria City, Mexico
2 Autonomous University of San Luis Potosi, Agronomy Faculty, 78321 Soledad de Graciano Sanchez, Mexico
3 IPICYT, Environmental Sciences Division, 78216 San Luis Potosí, Mexico
5 Phillips University of Marburg, Department of Geography, AG Ecological Plant Geography, Deutschhausstr. 10, D-26111 Marburg, Germany

We investigated the physiological responses of two epiphytic orchids under three light regimes of 20, 50, and 70% of total daily radiation under drought and rewatering conditions. Stanhopea tigrina was the one more affected because it exhibited strong photoinhibition and reduction of both electron transport rate and nocturnal acidity under drought and high radiation. However, this species maintained relatively high relative water content (RWC) values and underwent osmotic adjustment during the drought period and recovered photosynthetic variables during watered period. Prosthechea cochleata maintained similar water and photosynthetic responses to light conditions during the drought period and was more tolerant than S. tigrina. Principal component analysis provided evidence that water variables, such as RWC and succulence of both leaf and pseudobulb, were the most important variables for both species. Our results suggest that S. tigrina is more sensitive to drought than P. cochleata, and could be more affected by global warming.

Keywords: chlorophyll fluorescence; Mexico; Orchidaceae; photosynthesis; water stress.

Received: July 1, 2019; Accepted: August 26, 2019; Prepublished online: September 24, 2019; Published: November 1, 2019Show citation

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GUEVARA-PÉREZ, C.I., DELGADO-SÁNCHEZ, P., TORRES-CASTILLO, J.A., FLORES-RIVAS, J.D., MENDIETA-LEIVA, G., & DE LA ROSA-MANZANO, E. (2019). Epiphytic orchids Stanhopea tigrina and Prosthechea cochleata are differentially affected by drought in a subtropical cloud forest. Photosynthetica, 57(4), 1053-1065. doi: 10.32615/ps.2019.123.
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