NDLI: Photosynthesis and water relations of well-watered orange plants as affected by winter and summer conditions

Content Provider	Springer Nature Link
Author	Ribeiro, R.V. Machado, E.C. Santos, M.G. Oliveira, R.F.
Copyright Year	2009
Abstract	The aim of this study was to evaluate how the summer and winter conditions affect the photosynthesis and water relations of well-watered orange trees, considering the diurnal changes in leaf gas exchange, chlorophyll (Chl) fluorescence, and leaf water potential (Ψ) of potted-plants growing in a subtropical climate. The diurnal pattern of photosynthesis in young citrus trees was not significantly affected by the environmental changes when compared the summer and winter seasons. However, citrus plants showed higher photosynthetic performance in summer, when plants fixed 2.9 times more CO$_{2}$ during the diurnal period than in the winter season. Curiously, the winter conditions were more favorable to photosynthesis of citrus plants, when considering the air temperature (< 29 °C), leaf-to-air vapor pressure difference (< 2.4 kPa) and photon flux density (maximum values near light saturation) during the diurnal period. Therefore, low night temperature was the main environmental element changing the photosynthetic performance and water relations of well-watered plants during winter. Lower whole-plant hydraulic conductance, lower shoot hydration and lower stomatal conductance were noticed during winter when compared to the summer season. In winter, higher ratio between the apparent electron transport rate and leaf CO$_{2}$ assimilation was verified in afternoon, indicating reduction in electron use efficiency by photosynthesis. The high radiation loading in the summer season did not impair the citrus photochemistry, being photoprotective mechanisms active. Such mechanisms were related to increases in the heat dissipation of excessive light energy at the PSII level and to other metabolic processes consuming electrons, which impede the citrus photoinhibition under high light conditions.
Starting Page	215
Ending Page	222
Page Count	8
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	47
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-08-13
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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