Photosynthetica 2024, 62(1):116-125 | DOI: 10.32615/ps.2024.007

Photosystem II efficiency in response to diurnal and seasonal variations in photon flux density and air temperature for green, yellow-green, and purple-leaved cultivars of sweet potato [Ipomoea batatas (L.) Lam]

J.Y. JIANG1, †, C.W. WANG2, †, C.I. CHEN3, C.W. CHEN4, S.L. WONG2, S.P. CHEN5, M.Y. HUANG1, J.H. WENG1
1 Department of Life Sciences, Center of Global Change Biology, and Innovation and Development Center of Sustainable Agriculture, National Chung-Hsing University, 40227 Taichung, Taiwan
2 Endemic Species Research Institute, 552 Nantou, Taiwan
3 Department of Forestry, National Pingtung University of Science and Technology, Pingtung, 912 Taiwan
4 Tea Research and Extension Station, 552 Nantou, Taiwan
5 Department of Horticulture and Biotechnology, Chinese Culture University, 11114 Taipei, Taiwan

This study aimed to investigate the impact of diurnal and seasonal variations in photon flux density (PPFD) and air temperature on PSII efficiency in three sweet potato leaf-color cultivars: green (G), yellow-green (Y), and purple (P). The cultivars were exposed to full sunlight and measurements were taken from November to March. The maximal quantum yield of PSII photochemistry for the dark-adapted state (Fv/Fm) indicated Y's increased sensitivity to low temperatures at predawn, followed by G and P. Both quantum yield of PSII photochemistry for the dark and light-adapted state (ΔF/Fm') depressions were correlated with increased PPFD, with regression slopes in the order of Y > G > P. On high-light and low-temperature days, Fv/Fm values deviated below regression lines, with differences ranked as Y > G > P. These findings suggest that Y exhibits the highest sensitivity to high light and low temperatures, followed by G and then P in terms of PSII efficiency.

Additional key words: leaf pigments; chlorophyll fluorescence; nonphotochemical quenching; photoinhibition; photoprotection.

Received: September 18, 2023; Revised: December 8, 2023; Accepted: January 17, 2024; Prepublished online: February 15, 2024; Published: February 22, 2024  Show citation

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JIANG, J.Y., WANG, C.W., CHEN, C.I., CHEN, C.W., WONG, S.L., CHEN, S.P., HUANG, M.Y., & WENG, J.H. (2024). Photosystem II efficiency in response to diurnal and seasonal variations in photon flux density and air temperature for green, yellow-green, and purple-leaved cultivars of sweet potato [Ipomoea batatas (L.) Lam]. Photosynthetica, 62(1), 116-125. doi: 10.32615/ps.2024.007
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