ORCID Profile
0000-0002-2904-6657
Current Organisation
Deakin University
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Publisher: Elsevier BV
Date: 02-2013
Publisher: Wiley
Date: 22-06-2009
DOI: 10.1002/JGT.20378
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 07-2009
Publisher: Springer Science and Business Media LLC
Date: 21-05-2014
Publisher: Springer Science and Business Media LLC
Date: 04-02-2021
DOI: 10.1007/S12155-021-10249-5
Abstract: In Northern Europe, poplars ( Populus ) can provide biomass for energy and material use, but most available clones were developed for lower latitudes and are unlikely to be well adapted to higher latitudes, even under warmer climates. We thus need to understand how clones respond to climatic conditions and photoperiod, and how these responses can be predicted. We answer these questions exploiting leaf phenological data of Populus clones, grown in six sites across the Baltic region, in Northern Europe, for 2 years with contrasting climatic conditions. Regarding the effects of climatic conditions and photoperiod, within each site, higher temperatures advanced the timing and enhanced the speed of spring and autumn phenology, but reduced the effective growing season length. Across sites, latitude affected the timing of spring and autumn phenology, the speed of spring phenology, and the effective growing season length clone affected only the timing of phenology. Regarding the predictability of clone response to growing conditions, the growing degree day (GDD) model could not predict spring phenology, because the growing degree day threshold for a specific phenological stage was not only clone-, but also latitude- and year-specific. Yet, this GDD threshold allowed a robust ranking of clones across sites and years, thus providing a tool to determine the relative differences across clones, independently of latitude and temperature. A similar, but not as strong, pattern was observed in the timing of spring and autumn phenological stages. Hence, while prediction of spring phenology remains elusive, the ranking of clones based on observations of their phenology in a single location can provide useful indications on the clones’ relative performance under different latitudes and climates.
Publisher: Oxford University Press (OUP)
Date: 04-11-2010
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 07-2006
Publisher: Elsevier BV
Date: 2012
Publisher: Springer Berlin Heidelberg
Date: 2013
Publisher: Elsevier BV
Date: 05-2009
Publisher: Springer Science and Business Media LLC
Date: 20-11-2011
Publisher: Centre pour la Communication Scientifique Directe (CCSD)
Date: 22-04-2020
DOI: 10.46298/DMTCS.6369
Abstract: this is an extended abstract of the full version. We study n-vertex d-dimensional polytopes with at most one nonsimplex facet with, say, d + s vertices, called almost simplicial polytopes. We provide tight lower and upper bounds for the face numbers of these polytopes as functions of d, n and s, thus generalizing the classical Lower Bound Theorem by Barnette and Upper Bound Theorem by McMullen, which treat the case s = 0. We characterize the minimizers and provide ex les of maximizers, for any d.
Publisher: Cold Spring Harbor Laboratory
Date: 18-06-2020
DOI: 10.1101/2020.06.17.156281
Abstract: Entering and exiting winter dormancy presents important trade-offs between growth and survival at northern latitudes and many forest trees display local adaptation across latitude. Transfers of a species outside its native range introduce the species to novel combinations of environmental conditions potentially requiring different combinations of alleles to optimize growth. We performed genome wide association analyses and a selection scan in a P. trichocarpa mapping population derived from crossings between clones collected across the native range and introduced into Sweden. GWAS analyses were performed using phenotypic data collected across two field seasons and in a controlled phytotron experiment. We uncovered 629 putative candidate genes associated with spring and autumn phenology traits as well as with growth. Many regions harboring variation significantly associated with the initiation of leaf shed and leaf autumn coloring appeared to have been evolving under positive selection in the native environments of P. trichocarpa . A comparison between the candidate genes identified with results from earlier GWAS analyses performed in the native environment found a smaller overlap for spring phenology traits than for autumn phenology traits, aligning well with earlier observations that spring phenology transitions have a more complex genetic basis that autumn phenology transitions.
Publisher: Springer Science and Business Media LLC
Date: 19-04-2019
Publisher: Elsevier BV
Date: 2020
Publisher: Society for Industrial & Applied Mathematics (SIAM)
Date: 2018
DOI: 10.1137/17M1131994
Publisher: Springer Science and Business Media LLC
Date: 10-02-2012
Publisher: Springer Science and Business Media LLC
Date: 19-12-2020
Publisher: Wiley
Date: 10-10-2009
DOI: 10.1002/NET.20269
Publisher: Canadian Mathematical Society
Date: 21-05-2018
DOI: 10.4153/S0008414X18000123
Abstract: We study $n$ -vertex $d$ -dimensional polytopes with at most one nonsimplex facet with, say, $d+s$ vertices, called almost simplicial polytopes . We provide tight lower and upper bound theorems for these polytopes as functions of $d,n$ , and $s$ , thus generalizing the classical Lower Bound Theorem by Barnette and the Upper Bound Theorem by McMullen, which treat the case where $s=0$ . We characterize the minimizers and provide ex les of maximizers for any $d$ . Our construction of maximizers is a generalization of cyclic polytopes, based on a suitable variation of the moment curve, and is of independent interest.
Publisher: IEEE
Date: 11-2013
DOI: 10.1109/CTC.2013.12
Publisher: Elsevier BV
Date: 08-2011
Publisher: Cambridge University Press (CUP)
Date: 13-01-2010
No related grants have been discovered for Guillermo Pineda-Villavicencio.