Genetic structure of Buxus sinica var. parvifolia, a rare and endangered plant

Huang, Yan; Ji, Kongshu; Jiang, Zihong; Geng-guo, Tang

doi:10.1016/j.scienta.2008.01.001

Cited by 14 publications

(13 citation statements)

References 20 publications

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“…Considered as a rare, restricted and endemic species, V. cacuminis has a relatively high genetic diversity assessed by ISSR markers (PPB = 87% and I = 0.33%). Although higher genetic diversity has been mainly related to wider distributed species (Souza and Lovato, 2010), geographically restricted species have also shown relatively high diversity index (Cavallari et al, 2006;Huang et al, 2008). Consequently, these data provide evidence that other factors, in addition to geographical distribution, could contribute to maintain the variability in rare and restricted species.…”

Section: Discussionmentioning

confidence: 81%

Genetic diversity of Vriesea cacuminis (Bromeliaceae): an endangered and endemic Brazilian species

Ribeiro

Pinheiro²,

Domingues³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Data about the genetic structure can help to understand the evolutionary process of natural populations as well as to drive strategies of conservation. Vriesea cacuminis, an endemic Brazilian Bromeliad, has been found in 2 areas of Minas Gerais State. One is a legal preservation unit (Ibitipoca State Park) and the other an unprotected area (Serra Negra). The 2 areas belong to the Mantiqueira Mountain Range Complex; both are characterized by steep relief with high altitudes and by heterogenic vegetation formed by a mosaic of rocky fields and forest fragments. According to International Union for Conservation of Nature criteria, V. cacuminis is designated as "vulnerable". We examined the genetic variability and population structure of 70 individuals (3 populations) of V. cacuminis, using 16 ISSR markers. Although V. cacuminis is considered a rare species, the estimated genetic diversity was found to be relatively high (Shannon index = 0.33; percentage : 1934-1943 (2013) Genetic variability of Vriesea cacuminis of polymorphic bands = 87%). The populations were found not to be structured (AMOVA test, Φ ST = 0.16), probably due to the cross-breeding. Based on Bayesian analysis, this species includes one cluster containing the populations from Ibitipoca State Park and another cluster including the population from Serra Negra. This information will help determine strategies to maintain the genetic variability of these populations.

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Section: Discussionmentioning

confidence: 81%

Genetic diversity of Vriesea cacuminis (Bromeliaceae): an endangered and endemic Brazilian species

Ribeiro

Pinheiro²,

Domingues³

et al. 2013

Genet. Mol. Res.

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“…Many researchers have contributed to the theoretical foundations of MPE over the past six decades. [4][5][6][7][8][9][10][11][12][13][14][15] These investigations have revealed that the results of calculations are extremely sensitive to (i) the adopted theoretical model and (ii) the details of the electronic structure of the defect, with different approaches yielding variations of capture coefficients over many orders of magnitude. 16 Concerning aspect (i), earlier theoretical works [4][5][6][7][8][9][10][11][12][13][14][15] have made it clear that there is no single theoretical model that is valid in all cases.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11][12][13][14][15] These investigations have revealed that the results of calculations are extremely sensitive to (i) the adopted theoretical model and (ii) the details of the electronic structure of the defect, with different approaches yielding variations of capture coefficients over many orders of magnitude. 16 Concerning aspect (i), earlier theoretical works [4][5][6][7][8][9][10][11][12][13][14][15] have made it clear that there is no single theoretical model that is valid in all cases. A number of factors have to be considered in choosing the appropriate description, [4][5][6][7][8][9][10][11][12][13][14][15] including the hierarchy of different time scales (carrier capture times vs. phonon lifetimes and periods of lattice vibrations), the strength of electron-phonon coupling (linear vs. higher-order coupling schemes), the choice of a good starting point for perturbation theory (electron and phonon wavefunctions), and the number of different phonon modes that have to be considered.…”

Section: Introductionmentioning

confidence: 99%

“…16 Concerning aspect (i), earlier theoretical works [4][5][6][7][8][9][10][11][12][13][14][15] have made it clear that there is no single theoretical model that is valid in all cases. A number of factors have to be considered in choosing the appropriate description, [4][5][6][7][8][9][10][11][12][13][14][15] including the hierarchy of different time scales (carrier capture times vs. phonon lifetimes and periods of lattice vibrations), the strength of electron-phonon coupling (linear vs. higher-order coupling schemes), the choice of a good starting point for perturbation theory (electron and phonon wavefunctions), and the number of different phonon modes that have to be considered. This choice of description has to be considered for each type of defect individually, a practice we will follow in the current paper as well.…”

Section: Introductionmentioning

confidence: 99%

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First-principles theory of nonradiative carrier capture via multiphonon emission

2014

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We develop a practical first-principles methodology to determine nonradiative carrier capture coefficients at defects in semiconductors. We consider transitions that occur via multiphonon emission. Parameters in the theory, including electron-phonon coupling matrix elements, are computed consistently using state-of-the-art electronic structure techniques based on hybrid density functional theory. These provide a significantly improved description of bulk band structures, as well as defect geometries and wavefunctions. In order to properly describe carrier capture processes at charged centers, we put forward an approach to treat the effect of long-range Coulomb interactions on scattering states in the framework of supercell calculations. We also discuss the choice of initial conditions for a perturbative treatment of carrier capture. As a benchmark, we apply our theory to several hole-capturing centers in GaN and ZnO, materials of high technological importance in which the role of defects is being actively investigated. Calculated hole capture coefficients are in good agreement with experimental data. We discuss the insights gained into the physics of defects in wide-band-gap semiconductors, such as the strength of electron-phonon coupling and the role of different phonon modes.

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“…In particular, these techniques were successfully used to evaluate genetic diversity at inter (Benharrat et al 2002;Ruas et al 2003) and intraspecific level discriminating or characterizing different cultivars (Fang & Roose 1997;Terzopoulos et al 2005;Lu et al 2009), clones (De Pasquale et al 2006Uzun et al 2009a) and accessions (Coletta Filho et al 1998;Liu & Wendel 2001;Bao et al 2006), and besides in determining genetic relationships within and among populations (Dan et al 2006;Jin & Li 2007;Huang et al 2008;Boronnikova 2009). …”

Section: Introductionmentioning

confidence: 99%

Genetic analysis ofCitrus aurantiumL. (Rutaceae) cultivars by ISSR molecular markers

Lombardo

Schicchi

Marino

et al. 2011

Plant Biosystems - An International Journal Dealing with all As

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Eight cultivars of Citrus aurantium L., showing peculiar morphological traits of the fruits and leaves, were analyzed genetically. Inter simple sequence repeat (ISSR) was chosen as molecular markers because they represent a highly efficient system for investigating variability at intraspecific level. The particular morphological traits were discussed, the genetic identity and distance matrix based on Nei index was calculated, and the unweighted pair group method with arithmetic mean (UPGMA) dendrogram was generated. A total of 53 clearly distinguished DNA bands were considered for the ISSR analysis of which 24 were polymorphic. A basic C. aurantium fingerprinting pattern was obtained. The ISSR profiles allowed to discriminate only two cultivars, while the other six ones did not show polymorphisms, although their phenotypes were notably different, indicating that mutations must have occurred without significantly modifying the DNA length between the simple sequence repeats. The results showed a very low level of genetic variability among the cultivars; ‘‘Canaliculata’’ formed a separated cluster with C. sinensis Osbeck, suggesting a probable hybrid origin derived from crossing between sour and sweet orange. This study confirmed the reliability and reproducibly of ISSR markers for Citrus fingerprinting purposes, although some morphological differences could not be detected; therefore, both morphological and genetic characters must be considered for cultivar or variety identification

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Genetic structure of Buxus sinica var. parvifolia, a rare and endangered plant

Cited by 14 publications

References 20 publications

Genetic diversity of Vriesea cacuminis (Bromeliaceae): an endangered and endemic Brazilian species

Genetic diversity of Vriesea cacuminis (Bromeliaceae): an endangered and endemic Brazilian species

First-principles theory of nonradiative carrier capture via multiphonon emission

Genetic analysis ofCitrus aurantiumL. (Rutaceae) cultivars by ISSR molecular markers

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