Photosynthetica 2009, 47(3):363 | DOI: 10.1007/s11099-009-0057-9

Shade mitigates photoinhibition and enhances water use efficiency in kiwifruit under drought

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

We tested the hypotheses that a reduction of incident light of 50 % over sun-acclimated leaves of water stressed kiwifruit (Actinidia deliciosa var. deliciosa) would (1) reduce stomatal limitations to carbon supply and (2) mitigate the inactivation of the primary photochemistry associated with photosystem (PS) II, thereby this increases carbon gain and water-use efficiency (WUE). Groups of field-grown vines were either shaded or left naturally exposed and subjected to progressive water stress in order to study moderately and severely droughted vines, while other groups were well irrigated. Daily variations in leaf gas exchange and midday chlorophyll (Chl) a fluorescence were determined once plants had -0.6 MPa (moderate stress) and -1.0 MPa pre-down leaf water potential (severe stress). Variations in Chl pigment content and specific leaf area (SLA) are also discussed. Results reveal that 50 % shade application maintained efficiency of PSII close to 0.8 even under severe drought so that to prevent its large decline (0.65) recorded in sunlit leaves. Under moderate stress level stomata behaviour dominated upon metabolic impairments of PSII. Reduction of irradiance increased WUE (15-20 %) in droughted vines, representing a valuable intervention to save photosynthetic apparatus and improve WUE in vines experiencing typical Mediterranean summer stresses.

Additional key words: carbon gain; excessive radiation; photosynthesis; semi-arid condition; shade; stomatal limitation; water use efficiency

Received: September 18, 2008; Accepted: June 12, 2009; Published: September 1, 2009  Show citation

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Montanaro, G., Dichio, B., & Xiloyannis, C. (2009). Shade mitigates photoinhibition and enhances water use efficiency in kiwifruit under drought. Photosynthetica, 47(3), 363. doi: 10.1007/s11099-009-0057-9
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