Modulating the light environment with the peach 'asymmetric orchard': effects on gas exchange performances, photoprotection, and photoinhibition.

Journal of Experimental Botany
Pasquale LoscialeLuca Corelli Grappadelli

Abstract

The productivity of fruit trees is a linear function of the light intercepted, although the relationship is less tight when greater than 50% of available light is intercepted. This paper investigates the management of light energy in peach using the measurement of whole-tree light interception and gas exchange, along with the absorbed energy partitioning at the leaf level by concurrent measurements of gas exchange and chlorophyll fluorescence. These measurements were performed on trees of a custom-built 'asymmetric' orchard. Whole-tree gas exchange for north-south, vertical canopies (C) was similar to that for canopies intercepting the highest irradiance in the morning hours (W), but trees receiving the highest irradiance in the afternoon (E) had the highest net photosynthesis and transpiration while maintaining a water use efficiency (WUE) comparable to the other treatments. In the W trees, 29% and 8% more photosystems were damaged than in C and E trees, respectively. The quenching partitioning revealed that the non-photochemical quenching (NPQ) played the most important role in excess energy dissipation, but it was not fully active at low irradiance, possibly due to a sub-optimal trans-thylakoid DeltapH. The non-net carboxyla...Continue Reading

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Citations

May 23, 2013·Photosynthesis Research·William W AdamsBarbara Demmig-Adams
Mar 5, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Barbara Demmig-AdamsWilliam W Adams
Apr 15, 2014·Plant Physiology and Biochemistry : PPB·Tsuyoshi EndoFumihiko Sato
Oct 29, 2013·Biochimica Et Biophysica Acta·Mikko TikkanenEva-Mari Aro
Nov 7, 2016·Photosynthesis Research·Hazem M KalajiWojciech Bąba

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Methods Mentioned

BETA
environmental stress
Fluorescence
PCA
environmental stresses

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