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Shade effect on photosynthesis and photoinhibition in olive during drought and rewatering

Author

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  • Sofo, Adriano
  • Dichio, Bartolomeo
  • Montanaro, Giuseppe
  • Xiloyannis, Cristos

Abstract

Olive tree (Olea europaea L.) is commonly grown under environmental conditions characterised by water deficit, high temperatures and irradiance levels typical of Mediterranean semi-arid regions. Measurement of gas exchange, chlorophyll content, chlorophyll fluorescence and photoinhibition was carried out on two-year-old olive trees (cv. 'Coratina') subjected to a 21-day period of water deficit followed by 23 days of rewatering. At the beginning of the experiment, plants were divided in to two groups and subjected to different light regimes: exposed plants (EP) under a mean photosynthetically active radiation (PAR) at mid-day of 1800[mu]molm-2s-1 and shaded plants (SP) under a mean PAR of 1200[mu]molm-2s-1. The effect of drought and high irradiance levels caused a reduction of gas exchange and photosystem 2 (PSII) efficiency, in terms of quantum yield of PSII ([Phi]PSII) both in EP and SP. Shading conditions allowed plants to maintain a high photosynthetic activity at low values of stomatal conductance, whereas in EP the reductions in photosynthetic efficiency and intrinsic water efficiency were due to non-stomatal components of photosynthesis. The decrease in photosynthetic activity and the increase of photoinhibition under drought were more marked in EP than in SP. Full sunlight caused in EP a higher non-photochemical quenching, whereas SP showed a better photochemical efficiency. The information here obtained can be important to understand the mechanisms by which olive plants can minimize photoinhibition when subjected to simultaneous abiotic stresses.

Suggested Citation

  • Sofo, Adriano & Dichio, Bartolomeo & Montanaro, Giuseppe & Xiloyannis, Cristos, 2009. "Shade effect on photosynthesis and photoinhibition in olive during drought and rewatering," Agricultural Water Management, Elsevier, vol. 96(8), pages 1201-1206, August.
    • Handle: RePEc:eee:agiwat:v:96:y:2009:i:8:p:1201-1206
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    Cited by:

    1. Marta M. Moreno & Sara González-Mora & Jaime Villena & Carmen Moreno, 2023. "Organic Hydromulches in Young Olive Trees in Pots: Effects on Soil and Plant Parameters," Agriculture, MDPI, vol. 13(12), pages 1-20, November.
    2. Jiang, Shouzheng & Tang, Dahua & Zhao, Lu & Liang, Chuan & Cui, Ningbo & Gong, Daozhi & Wang, Yaosheng & Feng, Yu & Hu, Xiaotao & Peng, Yong, 2022. "Effects of different photovoltaic shading levels on kiwifruit growth, yield and water productivity under “agrivoltaic” system in Southwest China," Agricultural Water Management, Elsevier, vol. 269(C).

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