Modulating the light environment with the peach 'asymmetric orchard': effects on gas exchange performances, photoprotection, and photoinhibition
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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.author | Losciale, Pasquale | |
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dc.contributor.author | Chow, Wah S (Fred) | |
dc.contributor.author | Corelli-Grappadelli, Luca | |
dc.date.accessioned | 2015-12-07T22:33:16Z | |
dc.identifier.issn | 0022-0957 | |
dc.identifier.uri | http://hdl.handle.net/1885/23188 | |
dc.description.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 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.publisher | Oxford University Press | |
dc.source | Journal of Experimental Botany | |
dc.subject | Keywords: 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.title | Modulating the light environment with the peach 'asymmetric orchard': effects on gas exchange performances, photoprotection, and photoinhibition | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 61 | |
dc.date.issued | 2010 | |
local.identifier.absfor | 060705 - Plant Physiology | |
local.identifier.ariespublication | u4956746xPUB25 | |
local.type.status | Published Version | |
local.contributor.affiliation | Losciale, Pasquale , University of Bologna | |
local.contributor.affiliation | Chow, Wah S (Fred), College of Medicine, Biology and Environment, ANU | |
local.contributor.affiliation | Corelli-Grappadelli, Luca, University of Bologna | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 4 | |
local.bibliographicCitation.startpage | 1177 | |
local.bibliographicCitation.lastpage | 1192 | |
local.identifier.doi | 10.1093/jxb/erp387 | |
local.identifier.absseo | 820211 - Stone Fruit | |
dc.date.updated | 2016-02-24T11:27:36Z | |
local.identifier.scopusID | 2-s2.0-77649242632 | |
local.identifier.thomsonID | 000275567300020 | |
Collections | ANU Research Publications |
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