Genetic diversity of natural populations of Anemopaegma arvense (Bignoniaceae) in the Cerrado of São Paulo State, Brazil

Batistini, A. P.; Telles, Mariana P. C.; Bertoni, Bianca Waléria; Coppede, Juliana da Silva; Alves, Pedro Luís da Costa Aguiar; França, Suzelei de Castro; Pereira, Ana Maria Soares

doi:10.4238/vol8-1gmr538

Cited by 10 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This hazardous fate of the sexual embryo in E. pubescens would explain the low genetic variability and a mostly clonal population found in this species (Martins & Oliveira, ). In A. arvense , genetic variability is greater within populations than between them (Batistini et al ., ) and this is probably attributable to the greater survival of viable sexual embryos, as described for other polyembryonic species (Batygina, 1999a, b; Batygina & Vinogradova, ; Hörandl & Paun, ).…”

Section: Discussionmentioning

confidence: 82%

Sporophytic apomixis in polyploidAnemopaegmaspecies (Bignoniaceae) from central Brazil

2013

View full text Add to dashboard Cite

Apomixis and polyploidy have been important in the evolution of the angiosperms, and sporophytic apomixis has been associated with polyembryony and polyploidy in tropical floras. We studied the occurrence of polyembryony in populations of tetraploid Anemopaegma acutifolium, A. arvense and A. glaucum from the Brazilian cerrados, and histological features of sexual and apomictic processes were investigated in A. acutifolium. All populations and species were polyembryonic (68.9-98.4% of seeds). Normal double fertilization occurred in most ovules, with exceptions being that 3% of ovules were penetrated but not fertilized and in 4% of ovules both synergids were penetrated. The penetration of both synergids suggests a continuous attraction of pollen tubes and polyspermy. Adventitious embryo precursor cells (AEPs) arose from nucellar and integumental cells of the ovule in pollinated and unpollinated A. acutifolium, indicating sporophytic apomixis. However, further embryo and endosperm development required pollination and fertilization. This pseudogamy also allows concurrent sexual embryo development. Similar polyembryony rates and polyploidy indicated that A. arvense and A. glaucum are also apomictic, forming an agamic complex similar to that observed for some species of confamilial, but not closely related Handroanthus. The co-occurrence of apomixis and polyploidy in different groups of Bignoniaceae indicates homoplasious origin of these agamic complexes.

show abstract

Section: Discussionmentioning

confidence: 82%

Sporophytic apomixis in polyploidAnemopaegmaspecies (Bignoniaceae) from central Brazil

2013

View full text Add to dashboard Cite

show abstract

“…Other populations of native species from Brazilian savanna have been characterized with high level of genetic differentiation among them, e.g ., C. brasiliense ( F ST = 0.260) , Eugenia dysenterica ( F ST = 0.270) , D. alata , H. stigonocarpa ( F ST = 0.692), Jacaranda decurrens ( F ST = 0.263) , S. adstringens ( F ST = 0.290) , and A. arvense ( F ST = 0.283) . This genetic divergence found between populations of A. crassiflora and other species of Cerrado may possibly reflects the isolation between populations due to the processes of fragmentation and the reduction in size of the population.…”

Section: Resultsmentioning

confidence: 92%

“…In the past 40 years, extensive agricultural practices have caused changes in up to 60% of this ecosystem . For several authors, this fragmentation represents a huge barrier that hinders the gene exchange between populations, which might explain the high level of genetic differentiation among them . Loveless and Hamrick suggested that species characterized by entomophily are more sensitive to fragmented ecosystems due limited pollen movement, which can accentuate the differentiation among populations.…”

Section: Resultsmentioning

confidence: 99%

“…Annona crassiflora Mart ., also known as ‘araticum’, ‘marolo’ or ‘pinha‐do‐cerrado’ , is a native tree of Brazilian Cerrado, widely spread throughout the biome spanning across the states of São Paulo, Minas Gerais, Bahia, Mato Grosso do Sul, Mato Grosso, and Tocantins . There are numerous important species threatened for the fragmentation in the Brazilian Cerrado, including Dipteryx alata , Stryphnodendron adstringens , Caryocar brasiliense , Hymenaea stigonocarpa , Anemopaegma arvense , and Annona crassiflora .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Genetic Diversity and Structure of Populations of Annona crassiflora Mart. of Brazilian Savanna and Its Association with Chemical Variability

Egydio-Brandão

Furlan

Santos

2016

Chemistry & Biodiversity

View full text Add to dashboard Cite

Annona crassiflora Mart. is a native tree from Brazilian savanna. Isoquinoline alkaloids are characteristic of species of Annonaceae. This work aimed to assess the magnitude of genetic diversity among different populations of A. crassiflora using AFLP markers, and verify the existence of any correlation between the AFLP data and previous reported alkaloid composition. A. crassiflora from eight populations in the states of São Paulo, Goiás, Minas Gerais, and Distrito Federal were analyzed. The data suggest a low, moderate, and high level of genetic diversity from different populations of A. crassiflora. Concentration of alkaloids was significantly correlated with AFLP data, suggesting interaction between chemical and molecular markers in A. crassiflora. The data of association between the chemical and genetic differentiation of A. crassiflora may be useful to establish cultivation areas allowing the definition of strategies to preserve their genetic diversity with an interest in specific chemotypes for genetic improvement programs focused on sustainable utilization of this specie.

show abstract

“…The θ B value was determined under four models for dominant markers: Free model (Free f ), estimating inbreeding values; model θ B = 0 and model f = 0, where θ B and f were respectively fixed at zero; and Full model, encompassing all previous possibilities. Simulations were conducted using the Markov Monte Carlo chain (MCMC) [ 44 ]. The model selection was based on the observation of DIC (Deviance Information Criterion) values, adopting the one with the lowest DIC value [ 45 ].…”

Section: Methodsmentioning

confidence: 99%

Unraveling the genetic diversity of Ceiba pubiflora (Malvaceae) in isolated limestone outcrops: Conservation strategies

Brandão,

de Almeida Vieira,

Neves

et al. 2024

PLoS ONE

View full text Add to dashboard Cite

Seasonally Dry Tropical Forests (SDTFs) located on limestone outcrops are vulnerable to degradation caused by timber logging and limestone extraction for cement production. Some of these forests represent the last remnants of native vegetation cover, functioning as isolated islands. Ceiba pubiflora (Malvaceae) is a tree frequently found on limestone outcrops in the central region of Brazil. This study aimed to evaluate the genetic diversity and identify suitable populations for the establishment of Management Units (MUs) for conservation. Inter-simple sequence repeat markers were employed to assess the genetic diversity in ten populations sampled from the Caatinga, Cerrado, and Atlantic Forest biomes. The species exhibited substantial genetic diversity (HT = 0.345; PLP = 97.89%). Populations SAH, JAN, and MON demonstrated elevated rates of polymorphic loci (> 84.2%) along with notable genetic diversity (He > 0.325). Additionally, these populations were the primary contributors to gene flow. The analysis of molecular variance (AMOVA) indicated that most genetic variation occurs within populations (91.5%) than between them. In the Bayesian analysis, the ten populations were clustered into five groups, revealing the presence of at least three barriers to gene flow in the landscape: 1) the Central Plateau or Paranã River valley; 2) near the Espinhaço mountains or the São Francisco River valley; and 3) around the Mantiqueira mountain range, Chapada dos Veadeiros plateau, and disturbed areas. A positive and statistically significant correlation was observed between genetic (θB) and geographic distances (r = 0.425, p = 0.008). Based on these findings, we propose the establishment of Management Units in Minas Gerais state, encompassing the (1) southern region (MIN population), (2) central region (SAH population), and (3) north region (MON population), as well as in Goiás state, covering the (4) Central Plateau region. These units can significantly contribute to preserving the genetic diversity of these trees and protecting their habitat against ongoing threats.

show abstract

Genetic diversity of natural populations of Anemopaegma arvense (Bignoniaceae) in the Cerrado of São Paulo State, Brazil

Cited by 10 publications

References 30 publications

Sporophytic apomixis in polyploidAnemopaegmaspecies (Bignoniaceae) from central Brazil

Sporophytic apomixis in polyploidAnemopaegmaspecies (Bignoniaceae) from central Brazil

Genetic Diversity and Structure of Populations of Annona crassiflora Mart. of Brazilian Savanna and Its Association with Chemical Variability

Unraveling the genetic diversity of Ceiba pubiflora (Malvaceae) in isolated limestone outcrops: Conservation strategies

Contact Info

Product

Resources

About