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

Losciale, Pasquale; Chow, Wah S (Fred); Corelli-Grappadelli, Luca

Description

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...[Show more]

dc.contributor.authorLosciale, Pasquale
dc.contributor.authorChow, Wah S (Fred)
dc.contributor.authorCorelli-Grappadelli, Luca
dc.date.accessioned2015-12-07T22:33:16Z
dc.identifier.issn0022-0957
dc.identifier.urihttp://hdl.handle.net/1885/23188
dc.description.abstractThe 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 ΔpH. The non-net carboxylative mechanisms (NC) appeared to be the main photoprotective mechanisms at low irradiance levels and, probably, they could facilitate the establishment of a trans-thylakoid ΔpH more appropriate for NPQ. These findings support the conclusion that irradiance impinging on leaves may be excessive and can cause photodamage, whose repair requires energy in the form of carbohydrates that are thereby diverted from tree growth and productivity.
dc.publisherOxford University Press
dc.sourceJournal of Experimental Botany
dc.subjectKeywords: carbon dioxide; article; chemistry; gas; kinetics; light; metabolism; photosynthesis; plant leaf; Prunus; radiation exposure; Carbon Dioxide; Gases; Kinetics; Light; Photosynthesis; Plant Leaves; Prunus; Prunus persica Chlorophyll fluorescence; D1 protein; Non-net carboxylative transports; Non-photochemical quenching; Photodamage; Photosynthesis; Quenching analysis; Whole canopy gas exchange
dc.titleModulating the light environment with the peach 'asymmetric orchard': effects on gas exchange performances, photoprotection, and photoinhibition
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume61
dc.date.issued2010
local.identifier.absfor060705 - Plant Physiology
local.identifier.ariespublicationu4956746xPUB25
local.type.statusPublished Version
local.contributor.affiliationLosciale, Pasquale , University of Bologna
local.contributor.affiliationChow, Wah S (Fred), College of Medicine, Biology and Environment, ANU
local.contributor.affiliationCorelli-Grappadelli, Luca, University of Bologna
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage1177
local.bibliographicCitation.lastpage1192
local.identifier.doi10.1093/jxb/erp387
local.identifier.absseo820211 - Stone Fruit
dc.date.updated2016-02-24T11:27:36Z
local.identifier.scopusID2-s2.0-77649242632
local.identifier.thomsonID000275567300020
CollectionsANU Research Publications

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