Photosynthetica 2022, 60(3):457-464 | DOI: 10.32615/ps.2022.040

Diurnal decline in the photosynthetic capacity of uppermost leaves in an eggplant canopy grown in a horticultural greenhouse

K. NOMURA1, M. SAITO1, M. ITO1, S. YAMANE2, T. IWAO1, I. TADA1, T. YAMAZAKI1, S. ONO3, D. YASUTAKE1, 4, M. KITANO1
1 IoP Collaborative Creation Center, Kochi University, 200 Otsu, Monobe, Nankoku City, 783-8502 Kochi, Japan
2 Faculty of Agriculture and Marine Sciences, Kochi University, 200 Otsu, Monobe, Nankoku City, 783-8502 Kochi, Japan
3 Bioenvironmental Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka City, 819-0395 Fukuoka, Japan
4 Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka City, 819-0395 Fukuoka, Japan

Parameters representing leaf photosynthetic capacity, namely, the maximal carboxylation rate (Vcmax), maximal electron transport rate (Jmax), and triose phosphate-utilization rate (Tp), can vary depending on various factors. The present study investigated diurnal variations in Vcmax, Jmax, and Tp of uppermost leaves of soil-grown, well-watered eggplant in a greenhouse based on the simultaneous measurements of leaf gas exchange and chlorophyll fluorescence. The values of net photosynthetic rates and electron transport rates plotted against intercellular CO2 concentrations were noticeably higher in the morning than in the afternoon. Significant differences were detected among the values of Vcmax, Jmax, and Tp obtained at different times of day (08:30, 11:00, 13:30, and 16:00 h). All three parameters tended to decline as the time of day advanced; compared to the values at 08:30 h, Vcmax, Jmax, and Tp declined by approximately 15% at 16:00 h. Among the three parameters, Tp appeared to be the most sensitive to time.

Additional key words: CO2-photosynthesis curve; diurnal variation; Farquhar-von Caemmerer-Berry photosynthesis model; horticultural crop; photosynthesis limitation; triose phosphate utilization.

Received: June 11, 2022; Revised: June 11, 2022; Accepted: August 10, 2022; Prepublished online: August 31, 2022; Published: September 8, 2022  Show citation

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NOMURA, K., SAITO, M., ITO, M., YAMANE, S., IWAO, T., TADA, I., ... KITANO, M. (2022). Diurnal decline in the photosynthetic capacity of uppermost leaves in an eggplant canopy grown in a horticultural greenhouse. Photosynthetica, 60(3), 457-464. doi: 10.32615/ps.2022.040
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