Photosynthetica, 2007 (vol. 45), issue 4

Photosynthetica 2007, 45(4):533 | DOI: 10.1007/s11099-007-0091-4

Response of photosynthetic machinery of field-grown kiwifruit under Mediterranean conditions during drought and re-watering

G. Montanaro1,*, B. Dichio1, C. Xiloyannis1
1 Department of Crop Systems, Forestry and Environmental Sciences, University of Basilicata, Potenza, Italy

Groups of Actinidia deliciosa A. Chev. C.F. Liang et A.R. Ferguson var. deliciosa kiwifruit plants were subjected to soil water shortage (D), while other groups were well irrigated (I). Variations in chlorophyll (Chl) a fluorescence indices and leaf gas exchange were determined once plants were severely stressed (25 d after the beginning of the D-cycle). Daily maximum values of photosynthetic photon flux density (PPFD) were ca. 1 650 µmol(photon) m-2 s-1, while air temperatures peaked at 34.6 °C. High irradiance per se did not greatly affect the efficiency of photosystem (PS) 2, but predisposed its synergistic reduction by D co-occurrence. Fluorescence showed transient photodamage of PS2 with a complete recovery in the afternoon in both D and I plants. Upon re-watering the efficiency of PS2 was suboptimal (95 %) at day 2 after irrigation was reinitiated. At early morning of the day 5 of re-watering, photosynthesis and stomatal conductance recovered at about 95 and 80 % of I vines, respectively, indicating some after-stress effect on stomatal aperture. Once excessive photons reached PS2, the thermal dissipation of surplus excitation energy was the main strategy to save the photosynthetic apparatus and to optimize carbon fixation. The rather prompt recovery of both Chl a fluorescence indices and net photosynthetic rate during re-watering indicated that kiwifruit photosynthetic apparatus is prepared to cope with temporary water shortage under Mediterranean-type-climates.

Keywords: Actinidia; chlorophyll content; drought relief; excessive irradiation; fluorescence; net photosynthetic rate; photoinhibition; semi-arid conditions; stomatal conductance; transpiration rate

Received: March 12, 2007; Accepted: May 4, 2007; Published: December 1, 2007Show citation

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Montanaro, G., Dichio, B., & Xiloyannis, C. (2007). Response of photosynthetic machinery of field-grown kiwifruit under Mediterranean conditions during drought and re-watering. Photosynthetica, 45(4), 533. doi: 10.1007/s11099-007-0091-4.
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