Genetic diversity and population structure in the rare Algodones sunflower (Helianthus niveus ssp. tephrodes)

Mandel, Jennifer R.; Milton, Ethan F.; Donovan, Lisa A.; Knapp, Steven J.; Burke, John M.

doi:10.1007/s10592-012-0421-3

Cited by 9 publications

(10 citation statements)

References 45 publications

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“…In general, intraspecific divergence of H. niveus demonstrated a clear geographic pattern, as shown by our Mantel test. Mandel et al (2013) studied genetic diversity and population structure in H. niveus subsp. tephrodes and found a low level of standing genetic variation, but a higher level of population structure compared to other sunflower species.…”

Section: Rugosus_1mentioning

confidence: 99%

Intraspecific genetic divergence within Helianthus niveus and the status of two new morphotypes from Mexico

Zhang

Imerovski

Borkowski

et al. 2019

American J of Botany

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Sunflower (Helianthus annuus L.) is a globally important oilseed, food, and ornamental crop, the second largest hybrid crop and the fourth largest oilseed crop with an estimated production value of US $20 billion (FAO, 2016). Successive rounds of artificial selection have resulted in a smaller number of alleles or less genetic diversity in cultivated sunflower than in the species as a whole (Seiler, 1992; Mandel et al., 2011), a phenomenon known as a "domestication bottleneck" (Tanksley and McCouch, 1997). However, the crosscompatible nature of sunflower allows many beneficial traits to be introgressed from wild crop relatives (WCR) into cultivated sunflower (Thompson et al., 1981; Seiler, 1992; Dempewolf et al., 2017; Seiler et al., 2017). Therefore, maintaining WCR collections and understanding their diversity are critical for sustainable sunflower production and food security.

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Section: Rugosus_1mentioning

confidence: 99%

Intraspecific genetic divergence within Helianthus niveus and the status of two new morphotypes from Mexico

Zhang

Imerovski

Borkowski

et al. 2019

American J of Botany

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“…This genus has been found to be highly variable in expected heterozygosity, ranging from very high in the annual granite outcrop narrow endemic H. porteri (0.62), the widespread annual H. annuus (0.58), and the widespread woodland and prairie perennial H. occidentalis (0.56), to intermediate in the narrow woodland endemic H. verticillatus (0.48), the widespread prairie perennial H. grosseserratus (0.44), the widespread woodland perennial H. angustifolius (0.35), and the desert narrow endemic H. niveus ssp. tephrodes (0.31), with H. radula, P. tenuifolius, and H. carnosus falling toward the lower end of this variation (0.37, 0.34, and 0.28, respectively) as examined in this study (Table 3; Ellis et al 2006;Foré and Guttman 1999;Gevaert et al 2013;Mandel et al 2011Mandel et al , 2013. This wide variation is not clearly explained by differences in range size, life history, or other apparent characteristics.…”

Section: Genetic Factors and Narrow Endemismmentioning

confidence: 45%

“…This wide variation is not clearly explained by differences in range size, life history, or other apparent characteristics. However, unlike heterozygosity, population structure is fairly similar among these diverse Helianthus species, ranging from 0.077 in H. porteri to 0.207 in H. angustifolius, with all other studied species to date (including those examined in this study) falling within that range (Table 3; Ellis et al 2006;Foré and Guttman 1999;Gevaert et al 2013;Mandel et al 2011Mandel et al , 2013. Why this genus appears to buck expectations for higher than observed population structure in outcrossing annuals and short-lived perennials with gravity-dispersed seeds is unknown.…”

Section: Genetic Factors and Narrow Endemismmentioning

confidence: 65%

Environmental requirements trump genetic factors in explaining narrow endemism in two imperiled Florida sunflowers

et al. 2015

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The mechanisms generating narrow endemism have long been of interest to biologists, with a variety of underlying causes proposed. This study investigates the origins of narrow endemism of two imperiled Florida endemics, Helianthus carnosus and Phoebanthus tenuifolius, in relation to a widespread sympatric close relative, Helianthus radula, as well as other members of the genus Helianthus. Using a combination of population genetics and environmental niche modeling, this study compares evidence in support of potential mechanisms underlying the origin of narrow endemism, including environmental specialization versus inbreeding, loss of diversity, or other predominantly genetic factors. The two narrow endemics were found to be comparable in genetic diversity to H. radula as well as other widespread Helianthus species, with little to no evidence of inbreeding. Environmental niche modeling indicates that distributions of both narrow endemics are strongly related to temperature and precipitation patterns, and that both endemics are threatened with severe reductions in habitat suitability under projected climate change. Evidence indicates that genetic factors likely are not the cause of narrow endemism in these species, suggesting that these species are likely ecological specialists and thus historical narrow endemics. This makes both species vulnerable to climate change, and of immediate conservation concern.

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“…Genetic diversity of the rare and endangered sunflower H. niveus spp. tephrodes (Algodones sunflower), which is native to Southern California and Mexico, was investigated by Mandel et al (2013). The authors reported lower levels of genetic diversity (H exp = 0.31) in H. niveus spp.…”

Section: Discussionmentioning

confidence: 99%

“…Populations C1-5 were collected from site 1 while populations R1-9 were collected from site 2. Mandel et al, 2013). Helianthus niveus spp.…”

Section: Discussionmentioning

confidence: 99%

Genetic Diversity and Conservation Status of Helianthus verticillatus, an Endangered Sunflower of the Southern United States

et al. 2020

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Evaluating species diversity and patterns of population genetic variation is an essential aspect of conservation biology to determine appropriate management strategies and preserve the biodiversity of native plants. Habitat fragmentation and potential habitat loss are often an outcome of a reduction in naturally occurring wildfires and controlled prescribed burning, as seen in Helianthus verticillatus (whorled sunflower). This endangered, wild relative of the common sunflower, Helianthus annuus, is endemic to four locations in Alabama, Georgia, and Tennessee, United States. Despite its endangered status, there is no recovery plan for H. verticillatus, and knowledge related to its basic plant biology and importance in ecosystem services is mostly unknown. In this study, we utilized 14 microsatellite loci to investigate fine-scale population structure and genetic diversity of H. verticillatus individuals found on two sampling sites within the Georgia population. Our results indicated moderate genetic diversity and the presence of two distinct genetic clusters. Analyses of molecular variance indicated that the majority of variance was individually based, thus confirming high genetic differentiation and limited gene flow between H. verticillatus collection sites. The evidence of a population bottleneck in these sites suggests a recent reduction in population size that could be explained by habitat loss and population fragmentation. Also, high levels of linkage disequilibrium were detected, putatively suggesting clonal reproduction among these individuals. Our study provides a better understanding of fine-scale genetic diversity and spatial distribution of H. verticillatus populations in Georgia. Our results can underpin an original recovery plan for H. verticillatus that could be utilized for the conservation of this endangered species and to promote its persistence in the wild.

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Genetic diversity and population structure in the rare Algodones sunflower (Helianthus niveus ssp. tephrodes)

Cited by 9 publications

References 45 publications

Intraspecific genetic divergence within Helianthus niveus and the status of two new morphotypes from Mexico

Intraspecific genetic divergence within Helianthus niveus and the status of two new morphotypes from Mexico

Environmental requirements trump genetic factors in explaining narrow endemism in two imperiled Florida sunflowers

Genetic Diversity and Conservation Status of Helianthus verticillatus, an Endangered Sunflower of the Southern United States

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