Topic
Micranthus
About: Micranthus is a research topic. Over the lifetime, 57 publications have been published within this topic receiving 567 citations.
Papers published on a yearly basis
Papers
TL;DR: The absence of inbreeding depression in M. micranthus pollen and ovule production, two traits with strong links to fitness in a selfing annual, further suggests the important role of directional selection in determining the population's genetic load.
Abstract: We examined the effect of selfand cross-pollination on germination success, flowering probability, pollen and ovule production, survivorship, and adult aboveground biomass in two species of Mimulus with contrasting mating systems: the highly selfing M. micranthus and an outcrossing population of M. guttatus. Cross-pollinations were performed both within and between populations in order to examine the scale at which the genetic load is distributed. We found significant inbreeding depression in M. guttatus in four of the six traits, with the highest inbreeding depression observed in biomass (68% and 69% based on withinand between-population crosses, respectively) and lowest in ovule production (21% based on between-population crosses only). M. micranthus displayed significant inbreeding depression in only two of the six traits examined. Again, we observed the highest inbreeding depression in biomass (47-60% based on withinand betweenpopulation crosses, respectively), but both traits showing significant differences between self and outcross progeny expressed lower inbreeding depression than in M. guttatus. We detected no significant inbreeding depression for either pollen or ovule production in M. micranthus. An estimate of total inbreeding depression based on the multiplicative effects of all traits was also lower in M. micanthus th n in M. guttatus. Our results are consistent with the expected purging of genetic load in populations with high selfing rates. The absence of inbreeding depression in M. micranthus pollen and ovule production, two traits with strong links to fitness in a selfing annual, further suggests the important role of directional selection in determining the population's genetic load. Comparison of cross-pollinations made within and between populations revealed little evidence of divergence of genetic load among the M. micranthus and M. guttatus populations examined.
76 citations
TL;DR: Genetic analysis of F1, F2 and backcross generations derived from the cross M. micranthus × M. guttatus provided no evidence for major gene control of development processes responsible for differentiating the two taxa, and F2 segregation patterns suggest that duration and rate of development may be genetically independent of one another.
Abstract: Investigation of the developmental processes responsible for the evolution of the small-flowered, highly selfing Mimulus micranthus from its large-flowered, mixed-mating progenitor M. guttatus, revealed M. micranthus to have both a shorter duration and a higher rate of bud development. Hence flowers of M. micranthus can be considered as progenetic forms of M. guttatus. Genetic analysis of F1, F2 and backcross generations derived from the cross M. micranthus × M. guttatus provided no evidence for major gene control of development processes responsible for differentiating the two taxa. Furthermore, F2 segregation patterns suggest that duration and rate of development may be genetically independent of one another. Hence, the evolution of small-flowered selfing taxa in Mimulus may reflect selection for rapid development.
76 citations
TL;DR: This report reports for the first time the observation of a closely related congener in the western Atlantic – the Indo-Pacific azooxanthellate Tubastraea micranthus (Ehrenberg 1834) – and suggests that it may pose a threat similar to T. coccinea.
Abstract: Over the past 60-70 years, the invasive Indo-Pacific coral Tubastraea coccinea (Lesson 1830; Cnidaria, Scleractinia) has colonized the western tropical Atlantic Ocean - the Americas, the Antilles, northern Gulf of Mexico (GOM), and many of its 3,600 oil/gas platforms. It is now the single, most abundant coral on artificial substrata in the GOM, with hundreds of thousands of colonies on a single platform. Here, we report for the first time the observation of a closely related congener in the western Atlantic – the Indo-Pacific azooxanthellate Tubastraea micranthus (Ehrenberg 1834) – and suggest that it may pose a threat similar to T. coccinea. A total of 83 platforms, including deep-water, toppled, Rigs-to-Reefs structures, were surveyed in the northern Gulf of Mexico between 2000 and 2009, from Matagorda Island, Texas to Mobile, Alabama, USA, between the depths of 7 and 37 m, by SCUBA divers. Five platforms were surveyed by Remotely Operated Vehicle (ROV) to depths of up to 117 m. T. micranthus was found on only one platform – Grand Isle 93 (GI-93), off Port Fourchon, Louisiana, near the Mississippi River mouth, at the cross-roads of two major safety fairways/shipping lanes transited by large international commercial ships. The
56 citations
TL;DR: This review summarizes the information and findings concerning the current knowledge on the biological activities, pharmacological properties, toxicity, and chemical constituents of Loranthus micranthus.
Abstract: Loranthus micranthus Linn. is a medicinal plant from the Loranthaceae family commonly known as an eastern Nigeria species of the African mistletoe and is widely used in folkloric medicine to cure various ailments and diseases. It is semiparasitic plant because of growing on various host trees and shrubs and absorbing mineral nutrition and water from respective host. Hence, the phytochemicals and biological activities of L. micranthus demonstrated strong host and harvesting period dependency. The leaves have been proved to possess immunomodulatory, antidiabetic, antimicrobial, antihypertensive, antioxidant, antidiarrhoeal, and hypolipidemic activities. This review summarizes the information and findings concerning the current knowledge on the biological activities, pharmacological properties, toxicity, and chemical constituents of Loranthus micranthus.
52 citations
TL;DR: An Indo-Pacific scleractinian coral has invaded the northern Gulf of Mexico and the window for its potential eradication may be closing, with population density data suggesting that most populations are potentially in an expanding growth phase.
Abstract: An Indo-Pacific scleractinian coral has invaded the northern Gulf of Mexico (GOM): Tubastraea micranthus. It was initially observed on one oil platform (GI-93C) near the Mississippi River. Here, we determined whether its populations were spreading and whether there was evi- dence of rapid expansion. We compared population density data of T. micranthus with those from T. coccinea, a congener which invaded the western Atlantic earlier. Fourteen oil/gas platforms were assessed down to 138 m depth using remotely operated vehicle digital video. Colony den - sities in numbers m �2 were determined for both species, and colony size was measured for T. micranthus. Data were analyzed by platform and for geographic distribution. T. micranthus densities were highest on GI-93C and on GI-116A, SW of the Mississippi River, being significantly higher than on other platforms. Densities declined radially from there. Mean colony size was high- est on MC-311A, with colonies generally being >100 cm 2 . This platform is situated at the head of the Mississippi Canyon and may have been the original site of colonization. It also receives blue water instead of turbid, lower salinity water, and this species may grow better under those condi- tions. T. micranthus size frequency distributions were generally skewed towards 1-200 cm 2 (5 cm diameter) (sometimes >90% of the population), suggesting that most populations are potentially in an expanding growth phase. T. coccinea densities were high (range: ~50 to 300 colonies m �2 ). Its populations were also centered SW of the Mississippi River. T. micranthus is spreading through this region, and the window for its potential eradication may be closing.
33 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 2 |
| 2019 | 1 |
| 2018 | 2 |
| 2017 | 3 |
| 2016 | 6 |
| 2015 | 3 |