O'Reilly, Connor

Sevillano, Ignacio

Short, Ian

English

T-Stór

   TITLE: Physiological characteristics of Fagus sylvatica and Quercus robur in response to extreme light environments  AUTHORS: Sevillano, Ignacio, Short, Ian, O’Reilly, Conor            This article is provided by the author(s) and Teagasc T-Stór in accordance with publisher policies.  Please cite the published version.  The correct citation is available in the T-Stór record for this article. This item is made available to you under the Creative Commons Attribution-Non commercial-No Derivatives 3.0 License. NOTICE: This is the author’s abstract of a presentation made at IPSAM 2014 (Irish Plant Scientists’ Association Meeting, 2014). A definitive version was subsequently published in IPSAM 2014, Programme and Book of Abstracts. ABSTRACT  Physiological characteristics of Fagus sylvatica and Quercus robur in response to extreme light environments   Sevillano, Ignacio1&2*, Short, Ian1, O’Reilly, Conor2  1 Forestry Development Department, Teagasc, Ashtown, Dublin 15, Ireland 2 UCD Forestry, School of Agriculture & Food Science, University College Dublin, Dublin 4, Ireland  *Presenting author  Abstract Broadleaf planting has become important in Ireland, with European beech (Fagus sylvatica) and pedunculate oak (Quercus robur) as two of the most popular species planted. We studied the physiological responses of four year-old oak and five year-old beech to full sunlight (100% of incident photosythetically active radiation, PAR) and heavy shade (28% of incident PAR) in a shadehouse experiment during the summer of 2013.   Beech and oak exhibited different physiological responses when acclimatised to heavy shade, while they showed similar responses when were grown in full sunlight. Oak seedlings grown in heavy shade were better able to respond, as measured by photosynthesis rates, to increased incident light than beech seedlings. Oak seedlings generally showed greater values than beech seedlings in both light environments for the gas exchange (net photosynthesis, stomatal conductance, instantaneous water use efficiency and intrinsic water use efficiency) and fluorescence (photosystem II operating efficiency, photosystem II maximum efficiency, photochemical quenching and electron transport rate) parameters studied. For almost all of the gas exchange parameters explored during the study, beech seedlings exhibited greater physiological plasticity than oak seedlings in response to different light environments.        

Physiological characteristics of Fagus sylvatica and Quercus robur in response to extreme light environments

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