Landscape conservation and maternal environment affect genetic diversity and the physiological responses of Euterpe edulis (Arecaceae) progenies to light availability

<p>A deep understanding of the responses of terrestrial vegetation to environmental forcing is crucial for understanding the global carbon dynamics, especially under a changing climate. Vegetation responses to stress can manifest first as plant physiological responses, and at later stages through changes in canopy structure. Remote sensing of vegetation has been proven very valuable in providing such understanding. One of the major breakthroughs has been the use of multi and hyper spectral sensors on board satellites that can retrieve Solar Induced Fluorescence (SIF), which is closely linked with plant photosynthesis.</p><p>In this study we assess whether (SIF), as observed by instruments on board of satellites, can adequately capture both of those responses. Using 7 different global SIF products, water and CO2 flux data from 120 eddy-covariance towers and climate reanalysis products, we found a good agreement between the 16-day responses of flux tower observed gross primary productivity (GPP) and SIF to soil moisture and light, and a weaker agreement regarding the responses to temperature and atmospheric humidity. Overall, we found that current satellite SIF responses to environmental stressors mostly reflect structural changes in vegetation structure, and that satellite SIF has limited skill in capturing early stress plant physiological responses except for the light availability response at higher latitudes. While satellite SIF significantly outperforms more traditional vegetation indices (EVI, NDVI), as it does not saturate unlike the latter ones, it does not provide major additional information regarding vegetation physiological responses to either hydrological or atmospheric droughts.</p>

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Genetic diversity among populations of the xerophytic tree species Balanites aegyptiaca and its morpho-physiological responses to water deficiency

African Journal of Agricultural Research ◽

10.5897/ajar2017.12696 ◽

2017 ◽

Vol 12 (45) ◽

pp. 3252-3269 ◽

Cited By ~ 5

Author(s):

Khamis G. ◽

Schaarschmidt F. ◽

Papenbrock J.

Keyword(s):

Genetic Diversity ◽

Tree Species ◽

Physiological Responses ◽

Water Deficiency ◽

Balanites Aegyptiaca

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Changing environments and genetic variation: natural variation in inbreeding does not compromise short-term physiological responses

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2019.2109 ◽

2019 ◽

Vol 286 (1915) ◽

pp. 20192109 ◽

Cited By ~ 1

Author(s):

James Buckley ◽

Rónán Daly ◽

Christina A. Cobbold ◽

Karl Burgess ◽

Barbara K. Mable

Keyword(s):

Genetic Diversity ◽

Genetic Variation ◽

Physiological Responses ◽

Flowering Phenology ◽

Mating Strategies ◽

Relative Fitness ◽

Evolutionary Potential ◽

Short Term ◽

Arabidopsis Lyrata ◽

Physiological Capacity

Selfing plant lineages are surprisingly widespread and successful in a broad range of environments, despite showing reduced genetic diversity, which is predicted to reduce their long-term evolutionary potential. However, appropriate short-term plastic responses to new environmental conditions might not require high levels of standing genetic variation. In this study, we tested whether mating system variation among populations, and associated changes in genetic variability, affected short-term responses to environmental challenges. We compared relative fitness and metabolome profiles of naturally outbreeding (genetically diverse) and inbreeding (genetically depauperate) populations of a perennial plant, Arabidopsis lyrata , under constant growth chamber conditions and an outdoor common garden environment outside its native range. We found no effect of inbreeding on survival, flowering phenology or short-term physiological responses. Specifically, naturally occurring inbreeding had no significant effects on the plasticity of metabolome profiles, using either multivariate approaches or analysis of variation in individual metabolites, with inbreeding populations showing similar physiological responses to outbreeding populations over time in both growing environments. We conclude that low genetic diversity in naturally inbred populations may not always compromise fitness or short-term physiological capacity to respond to environmental change, which could help to explain the global success of selfing mating strategies.

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Changing environments and genetic variation: inbreeding does not compromise short-term physiological responses

10.1101/520015 ◽

2019 ◽

Author(s):

James Buckley ◽

Rónán Daly ◽

Christina Cobbold ◽

Karl Burgess ◽

Barbara K. Mable

Keyword(s):

Genetic Diversity ◽

Genetic Variation ◽

Mating System ◽

Physiological Responses ◽

Mating Strategies ◽

Outdoor Environment ◽

Relative Fitness ◽

List Type ◽

Short Term ◽

Wide Range

ABSTRACTSelfing plant lineages are surprisingly widespread and successful in a broad range of environments, despite showing reduced genetic diversity, which is predicted to reduce long-term evolutionary potential. However, short-term capacity to respond appropriately to new conditions might not require high levels of standing genetic variation. The purpose of this study was to directly test whether mating system variation and its associated changes in genetic variability in natural populations affected responses to short-term environmental challenges.We compared relative fitness and metabolome profiles of naturally outbreeding (genetically diverse) and inbreeding (genetically depauperate) populations of a long-lived perennial plant, Arabidopsis lyrata, under constant growth chamber conditions and an outdoor common garden environment outside its native range.We found no effect of mating system on survival or reproductive output, although several phenological traits showed different associations with latitude for outcrossing and inbreeding populations. Natural inbreeding had no effect on the plasticity of physiological responses, using either multivariate approaches or analysis of variation in individual metabolites. Moreover, while both growing environment and time significantly affected the relative abundance of individual metabolites, inbreeding populations responded similarly to outbreeding populations, suggesting adaptation to the outdoor environment, regardless of mating system.We conclude that low genetic diversity in naturally inbred populations may not compromise fitness or short-term capacity for appropriate physiological responses to environmental change. The absence of natural costs of inbreeding could help to explain the global success of clonal or asexual mating strategies for adapting to a wide range of environments.

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Effects of Different Simulated Management Intensities on The Genetic Diversity of a Heart-of-palm Tree Natural Population (Euterpe edulis Martius)

Silvae Genetica ◽

10.1515/sg-2010-0024 ◽

2010 ◽

Vol 59 (1-6) ◽

pp. 201-210 ◽

Cited By ~ 6

Author(s):

Juliano Zago Da Silva ◽

Maurício Sedrez Dos Reis

Keyword(s):

Genetic Diversity ◽

Genetic Characterization ◽

Selective Logging ◽

Fixation Index ◽

Palm Tree ◽

Euterpe Edulis ◽

Heterozygosity Loss ◽

Euterpe Edulis Martius ◽

Total Seed ◽

The Impact

Abstract The objective of this study was to evaluate the impact of selective logging on genetic diversity and inbreeding a heart-of-palm tree (Euterpe edulis), simulating different cutting intensities. To detect the effects of logging, we first performed the genetic characterization of the reproductive plants present in 24 plots that were allocated in Ibirama-SC, Brazil. For the genetic characterization we used allozyme markers, and for simulating the occurrence of different cutting intensities (5, 10, 20, 30, 40, 50, 60 and 150 seed-trees/ha) we performed 1000 resamplings within the total seed-tree group (599). Thus, it was possible to compare the genetic diversity among the different cutting intensities and the unmanaged population, through alterations to the allelic frequencies, heterozygosity, loss of alleles and increase in the inbreeding. The results of genetic indexes for different cutting intensity were variable, but all presented the same tendency towards genetic diversity reduction when the density of the seed-trees/ha was reduced. The results show that the density of 60 seed-trees/ha, or higher are the most indicated when the objective is to utilize this natural resource in a sustainable way as regards the management issues, because they did not present loss of alleles or reduction in the number of polymorphic loci, and also because they presented the lowest reductions in the observed and expected heterozygosity index and fixation index.

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