TY - JOUR T1 - High temperature at lower elevation sites fails to promote acclimation or adaptation to heat stress during pollen germination. JF - Frontiers in Plant Science Y1 - 2018 A1 - Flores-Rentería, L. A1 - Whipple, A.V., A1 - Benally, G.J. A1 - Patterson, A.M. A1 - Canyon, B. A1 - Gehring, C.A. AB -

High temperatures associated with climate change are expected to be detrimental for aspects of plant reproduction, such as pollen viability. We hypothesized that (1) higher peak temperatures predicted with climate change would have a minimal effect on pollen viability, while high temperatures during pollen germination would negatively affect pollen viability, (2) high temperatures during pollen dispersal would facilitate acclimation to high temperatures during pollen germination, and (3) pollen from populations at sites with warmer average temperatures would be better adapted to high temperature peaks. We tested these hypotheses in Pinus edulis, a species with demonstrated sensitivity to climate change, using populations along an elevational gradient. We tested for acclimation to high temperatures by measuring pollen viability during dispersal and germination stages in pollen subjected to 30, 35, and 40°C in a factorial design. We also characterized pollen phenology and measured pollen heat tolerance using trees from nine sites along a 200 m elevational gradient that varied 4°C in temperature. We demonstrated that this gradient is biologically meaningful by evaluating variation in vegetation composition and P. edulis performance. Male reproduction was negatively affected by high temperatures, with stronger effects during pollen germination than pollen dispersal. Populations along the elevational gradient varied in pollen phenology, vegetation composition, plant water stress, nutrient availability, and plant growth. In contrast to our hypothesis, pollen viability was highest in pinyons from mid-elevation sites rather than from lower elevation sites. We found no evidence of acclimation or adaptation of pollen to high temperatures. Maximal plant performance as measured by growth did not occur at the same elevation as maximal pollen viability. These results indicate that periods of high temperature negatively affected sexual reproduction, such that even high pollen production may not result in successful fertilization due to low germination. Acquired thermotolerance might not limit these impacts, but pinyon could avoid heat stress by phenological adjustment of pollen development. Higher pollen viability at the core of the distribution could be explained by an optimal combination of biotic and abiotic environmental factors. The disconnect between measures of growth and pollen production suggests that vigor metrics may not accurately estimate reproduction.

VL - 9 UR - https://www.frontiersin.org/articles/10.3389/fpls.2018.00536/full ER - TY - CONF T1 - A holistic approach to genetic conservation in Pinus strobiformis. T2 - International Scientific Conference on Genetics of Populations Progress and Perspectives commemorating the 80th birthday of Academician Altukhov and dedicated to the 45th Anniversary of the Laboratory of Population Genetics named after Yu P Biological Sta Y1 - 2017 A1 - K Waring A1 - Cushman,S A1 - Eckert,A A1 - L Flores-Renteria A1 - R Sniezko A1 - Still,C A1 - Wehenkel,C A1 - AV Whipple A1 - Wing,M A1 - Yury,P AB -

Waring, K, Cushman, S, Eckert A, Flores Renteria, L, Sniezko, R, Still,C, Wehenkel, C, Whipple, A, and Wing, M. 2017. A holistic approach to genetic conservation in Pinus strobiformis. International Scientific Conference on Genetics of Populations: Progress and Perspectives, commemorating the 80th birthday of Academician Yury P. Altukhov and dedicated to the 45th Anniversary of the Laboratory of Population Genetics named after Yu. P. Altukhov, 17-21 April 2017, Zvenogorod Biological Station, Russia.

JF - International Scientific Conference on Genetics of Populations Progress and Perspectives commemorating the 80th birthday of Academician Altukhov and dedicated to the 45th Anniversary of the Laboratory of Population Genetics named after Yu P Biological Sta T3 - International Scientific Conference on Genetics of Populations Progress and Perspectives commemorating the 80th birthday of Academician Altukhov and dedicated to the 45th Anniversary of the Laboratory of Population Genetics named after Yu P Biological Sta CY - Zvenogorod Biological Station, Russia VL - 2017 N1 - [Original String]:Waring, K, Cushman, S, Eckert A, Flores Renteria, L, Sniezko, R, Still, C, Wehenkel, C, Whipple, A, and Wing, M. 2017. A holistic approach to genetic conservation in Pinus strobiformis. International Scientific Conference on Genetics of Populations: Progress and Perspectives, commemorating the 80th birthday of Academician Yury P. Altukhov and dedicated to the 45th Anniversary of the Laboratory of Population Genetics named after Yu. P. Altukhov, 17-21 April 2017, Zvenogorod Biological Station, Russia. ER - TY - JOUR T1 - High carbon use efficiency in soil microbial communities is related to growth, not storage compound synthesis. JF - Soil Biology and Biochemistry Y1 - 2015 A1 - P Dijkstra A1 - Salpas,E A1 - Fairbanks,D A1 - Miller,EB A1 - Hagerty,SB A1 - KJ van Groenigen A1 - Hungate,BA A1 - Marks,JC A1 - GW Koch A1 - Schwartz,E VL - 89 N1 - [Original String]:Dijkstra, P., Salpas, E., Fairbanks, D., Miller EB, Hagerty, S.B., van Groenigen, K.J., Hungate, B.A., Marks, J.C., Koch, G.W., and Schwartz, E. (2015). High carbon use efficiency in soil microbial communities is related to growth, not storage compound synthesis. Soil Biology and Biochemistry 89, 35-43. ER - TY - CONF T1 - High carbon use efficiency is not explained by production of storage compounds. T2 - European Geophysical Union Annual Meeting Y1 - 2015 A1 - P Dijkstra A1 - KJ van Groenigen AB -

Dijkstra, P. and van Groenigen, K.J. (2015). High carbon use efficiencyis not explained by production of storage compounds. EGU April 12-17, Vienna.

JF - European Geophysical Union Annual Meeting T3 - European Geophysical Union Annual Meeting CY - Vienna, Austria N1 - [Original String]:Dijkstra, P. and van Groenigen, K.J. (2015). High carbon use efficiency is not explained by production of storage compounds. EGU April 12-17, Vienna. ER - TY - JOUR T1 - Hybridization among foundation tree species influences the structure of associated understory plant communities JF - Botany-botanique Y1 - 2011 A1 - Lamit,LJ A1 - Wojtowicz,T A1 - Kovacs,Z A1 - Wooley,SC A1 - M Zinkgraf AB - Understanding how genetic identity influences community structure is a major focus in evolutionary ecology, yet few studies examine interactions among organisms in the same trophic level within this context. In a common garden containing trees from a hybrid system (S. Wats. × James), we tested the hypothesis that the structure of establishing understory plant communities is influenced by genetic differences among trees and explored foliar condensed tannins (CTs) and photosynthetically active radiation (PAR) as mechanisms. Several findings support our hypothesis: () Understory biomass and cover increase along the genetic gradient from to . () Along the same hybridization gradient, species richness decreases and species composition shifts. () foliar CT concentrations and PAR decrease from to . () Understory species richness increases with foliar CTs; however, biomass, cover, and composition show no relationship with CTs, and no understory variables correlate with PAR. () Structural equation modeling suggests that foliar CTs are a primary mechanism linking overstory tree genetics with understory richness. Using an experimental system dominated by naturally colonizing exotic species, this study demonstrates that a genetic gradient created by tree hybridization can influence understory plants.Pour l'écologie évolutive, la compréhension de l'influence de l'identité génétique sur la structure des communautés constitue un enjeu majeur; pourtant, il existe peu d'études ayant examiné les interactions entre les organismes occupant la même échelle trophique dans ce contexte. Dans un jardin commun comportant des arbres provenant d'un système hybride (S. Wats.× James), les auteurs ont vérifié l'hypothèse à l'effet que la structure de la mise en place des communautés végétales de sous bois se fait sous l'influence des différences génétiques entre les arbres, en utilisant comme mécanismes les tannins foliaires condensés (CTs) et les radiations photosynthétiquement actives (PAR). Plusieurs constatations supportent cette hypothèse. () La biomasse de sous bois et la couverture augmentent le long d'un gradient génétique, à partir du jusqu'au . () Le long du même gradient d'hybridation, la richesse en espèces diminue et la composition en espèces se déplace. () La teneur en CT foliaires et les PAR des diminuent du vers le . () La richesse en espèces du sous-bois augmente avec les CTs foliaires, cependant, la couverture et la composition de la neige ne montrent pas de relation avec les CTs, et aucune variable du sous-bois ne montre de corrélation avec les PAR. () La modélisation de l'équation structurale suggère que les CTs constituent un mécanisme primaire liant la génétique des arbres de la canopée avec la richesse en sous-étage. 08 l'aide d'un système expérimental dominé par la colonisation naturelle avec des espèces exotiques, cette étude démontre qu'un gradient génétique créé par l'hybridation des arbres peut influencer les plantes de sous-bois. VL - 89 UR - http://www.ingentaconnect.com/content/nrc/bot/2011/00000089/00000003/art00003 IS - 3 ER - TY - CHAP T1 - Host plants mediate ant-aphid mutualisms and their effects on community structure and diversity T2 - Ecological communities: plant mediation in indirect interaction webs. Y1 - 2007 A1 - Wimp,GM A1 - TG Whitham ED - Ohgushi,T ED - Craig,TP ED - Price,PW JF - Ecological communities: plant mediation in indirect interaction webs. PB - Cambridge University Press CY - New York, NY, USA ER -