Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens
Populus species with wide geographic ranges display strong adaptation to local environments. We studied the clinal patterns in phenology and ecophysiology in allopatric Populus species adapted to similar environments on different continents under common garden settings. As a result of climatic ada...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2015-07-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00528/full |
| _version_ | 1819050350086193152 |
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| author | Raju Yaranna Soolanayakanahally Raju Yaranna Soolanayakanahally Robert Dean Guy Nathaniel R Street Kathryn M Robinson Salim N Silim Benedicte R Albrectsen Stefan eJansson |
| author_facet | Raju Yaranna Soolanayakanahally Raju Yaranna Soolanayakanahally Robert Dean Guy Nathaniel R Street Kathryn M Robinson Salim N Silim Benedicte R Albrectsen Stefan eJansson |
| author_sort | Raju Yaranna Soolanayakanahally |
| collection | DOAJ |
| description | Populus species with wide geographic ranges display strong adaptation to local environments. We studied the clinal patterns in phenology and ecophysiology in allopatric Populus species adapted to similar environments on different continents under common garden settings. As a result of climatic adaptation, both P. tremula L. and Populus balsamifera L. display latitudinal clines in photosynthetic rates (A), whereby high-latitude trees of P. tremula had higher A compared to low-latitude trees and nearly so in P. balsamifera (p = 0.06). Stomatal conductance (gs) and chlorophyll content index (CCI) follow similar latitudinal trends. However, foliar nitrogen was positively correlated with latitude in P. balsamifera and negatively correlated in P. tremula. No significant trends in carbon isotope composition of the leaf tissue (δ13C) were observed for both species; but, intrinsic water-use efficiency (WUEi) was negatively correlated with the latitude of origin in P. balsamifera. In spite of intrinsically higher A, high-latitude trees in both common gardens accomplished less height gain as a result of early bud set. Thus, shoot biomass was determined by height elongation duration (HED), which was well approximated by the number of days available for free growth between bud flush and bud set. In doing so, we highlight the shortcoming of unreplicated outdoor common gardens for tree improvement and the crucial role of photoperiod in limiting height growth, further complicating interpretation of other secondary effects. |
| first_indexed | 2024-12-21T11:46:39Z |
| format | Article |
| id | doaj.art-5efeac8caf5d49eda712c65784f319ad |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-12-21T11:46:39Z |
| publishDate | 2015-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-5efeac8caf5d49eda712c65784f319ad2022-12-21T19:05:09ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2015-07-01610.3389/fpls.2015.00528117103Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardensRaju Yaranna Soolanayakanahally0Raju Yaranna Soolanayakanahally1Robert Dean Guy2Nathaniel R Street3Kathryn M Robinson4Salim N Silim5Benedicte R Albrectsen6Stefan eJansson7Agriculture and Agri-Food CanadaUniversity of British ColumbiaUniversity of British ColumbiaUmeå UniversityUmeå UniversityAgriculture and Agri-Food CanadaUmeå UniversityUmeå UniversityPopulus species with wide geographic ranges display strong adaptation to local environments. We studied the clinal patterns in phenology and ecophysiology in allopatric Populus species adapted to similar environments on different continents under common garden settings. As a result of climatic adaptation, both P. tremula L. and Populus balsamifera L. display latitudinal clines in photosynthetic rates (A), whereby high-latitude trees of P. tremula had higher A compared to low-latitude trees and nearly so in P. balsamifera (p = 0.06). Stomatal conductance (gs) and chlorophyll content index (CCI) follow similar latitudinal trends. However, foliar nitrogen was positively correlated with latitude in P. balsamifera and negatively correlated in P. tremula. No significant trends in carbon isotope composition of the leaf tissue (δ13C) were observed for both species; but, intrinsic water-use efficiency (WUEi) was negatively correlated with the latitude of origin in P. balsamifera. In spite of intrinsically higher A, high-latitude trees in both common gardens accomplished less height gain as a result of early bud set. Thus, shoot biomass was determined by height elongation duration (HED), which was well approximated by the number of days available for free growth between bud flush and bud set. In doing so, we highlight the shortcoming of unreplicated outdoor common gardens for tree improvement and the crucial role of photoperiod in limiting height growth, further complicating interpretation of other secondary effects.http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00528/fullPhotosynthesispoplarcarbon isotope discriminationcomparative physiologylatitudewater-use efficiency |
| spellingShingle | Raju Yaranna Soolanayakanahally Raju Yaranna Soolanayakanahally Robert Dean Guy Nathaniel R Street Kathryn M Robinson Salim N Silim Benedicte R Albrectsen Stefan eJansson Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens Frontiers in Plant Science Photosynthesis poplar carbon isotope discrimination comparative physiology latitude water-use efficiency |
| title | Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens |
| title_full | Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens |
| title_fullStr | Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens |
| title_full_unstemmed | Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens |
| title_short | Comparative physiology of allopatric Populus species: Geographic clines in photosynthesis, height growth and carbon isotope discrimination in common gardens |
| title_sort | comparative physiology of allopatric populus species geographic clines in photosynthesis height growth and carbon isotope discrimination in common gardens |
| topic | Photosynthesis poplar carbon isotope discrimination comparative physiology latitude water-use efficiency |
| url | http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00528/full |
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