Show simple item record

dc.contributor.authorPeri, P.en
dc.contributor.authorMoot, Derrick J.en
dc.contributor.authorJarvis, Peteren
dc.contributor.authorMcNeil, D.en
dc.contributor.authorLucas, Richard J.en
dc.date.accessioned2009-07-17T02:38:31Z
dc.date.issued2007en
dc.identifier.citationPeri, P. L., Moot, D. J., Jarvis, P., McNeil, D. L., & Lucas, R. J. (2007). Morphological, anatomical, and physiological changes of orchardgrass leaves grown under fluctuating light regimes. Agronomy Journal, 99(6): 1502-1513.en
dc.identifier.issn0002-1962en
dc.identifier.urihttps://hdl.handle.net/10182/1128
dc.description.abstractThe physiological and anatomical adaptability of pastures growing under trees in silvopastoral systems can alter the efficiency of conversion of energy to dry matter (DM). This study was conducted to determine the effects of different fluctuating light regimes (from 24 to 100% transmissivity) on leaf physiology, morphology, anatomy, and structure of orchardgrass (Dactylis glomerata L.) in a silvopastoral experiment (New Zealand). Slatted shade structures created a bimodal light regime that represented an existing silvopastoral system. Morphologically, as transmissivity decreased the length of the youngest fully expanded leaf and pseudo-stem height increased by up to 33% and the leaf width declined up to 22%. Physiologically, leaf adaptation to different light regimes was characterized by: (i) the light-saturated rate of net photosynthesis (Pmax) and to less extent the photosynthetic efficiency (α) in sun conditions was double; (ii) in sunny conditions plants grown under shade were photosynthetically less efficient than plants grown in full sunlight with lower Pmax and α values; (iii) when plants were exposed to severe shade, leaves adapted to severe shade condition had the highest Pmax, α, and θ, and saturated at the minimum photosynthetic photon flux density (PPFD) value. These changes in leaf photosynthesis characteristics under different light regimes were attributed to anatomical changes that caused reductions in stomatal conductance (gs), the mesophyll surface area/leaf surface area ratio (Ames/A) and maintenance respiration for shade adapted plants. These photosynthetic responses and leaf adaptations to fluctuating light regimes can be included into a canopy photosynthesis model to improve the accuracy of DM predictions in silvopastoral systems.en
dc.format.extent1502-1513en
dc.language.isoenen
dc.publisherAmerican Society of Agronomyen
dc.relationThe original publication is available from - American Society of Agronomy - http://hdl.handle.net/10182/1128en
dc.rights© 2007 American Society of Agronomyen
dc.subjectorchardgrassen
dc.subjectDactylis glomerataen
dc.subjectpastureen
dc.subjectlighten
dc.subjectshadeen
dc.subjectAgronomy & Agricultureen
dc.titleMorphological, anatomical, and physiological changes of orchardgrass leaves grown under fluctuating light regimesen
dc.typeJournal Article
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300200 Crop and Pasture Production::300205 Agronomyen
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Agricultural Sciencesen
lu.contributor.unitResearch Management Officeen
lu.contributor.unit/LU/Research Management Office/2018 PBRF Staff groupen
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.relation.isPartOfAgronomy Journalen
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/AGSC
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/2018 PBRF Staff group
pubs.publication-statusPublisheden
pubs.publisher-urlhttp://hdl.handle.net/10182/1128en
pubs.volume99en


Files in this item

Default Thumbnail

This item appears in the following Collection(s)

Show simple item record