Topic
Rhamnus
About: Rhamnus is a research topic. Over the lifetime, 134 publications have been published within this topic receiving 2413 citations.
Papers published on a yearly basis
Papers
TL;DR: The photosynthetic traits of R. ludovici-salvatoris account for its limited ability to compete with other species in the Mediterranean region and are likely to be unfavorable for plant productivity under arid conditions.
Abstract: We sought to explain the declining distribution in the Balearic Islands of the endemic shrub Rhamnus ludovici-salvatoris R. Chodat, by comparing its photosynthetic response to drought with that of several widely distributed, competing Mediterranean species (R. alaternus L., Quercus ilex L., Pistacia lentiscus L., Q. humilis Mill. and P. terebinthus L.). All of the study species, except for the two Rhamnus species, avoided desiccation by rapidly adjusting their stomatal conductance at the onset of drought, and maintaining constant leaf relative water content. The two Rhamnus species showed desiccation-tolerant behavior; i.e., as drought progressed, their predawn leaf relative water content decreased simultaneously with stomatal closure. All four desiccation-avoiding species showed a significant positive correlation between leaf thermal dissipation (estimated by the fluorescence parameter NPQ (non-photochemical quenching)) and the de-epoxidation state of the xanthophyll cycle (DPS). The two Rhamnus species exhibited maximum DPS regardless of treatment, but only R. alaternus increased NPQ in response to drought. Rhamnus ludovici-salvatoris had a high ratio of photorespiration to photosynthesis and a low intrinsic water-use efficiency; traits that are likely to be unfavorable for plant productivity under arid conditions. It also had the lowest DPS and thermal dissipation among the six species. We conclude that the photosynthetic traits of R. ludovici-salvatoris account for its limited ability to compete with other species in the Mediterranean region.
152 citations
TL;DR: Fruits of the five common fleshy-fruit plant species in an Israeli Mediterranean scrub were removed by twelve bird species of which seven were transients, and the highest density of bird-deposit seeds was found under Rhamnus.
Abstract: Fruits of the five common fleshy-fruit plant species in an Israeli Mediterranean scrub were removed by twelve bird species of which seven were transients. Fruits of shrubs Rhamnus palaestinus and Pistacia lentiscus were removed mainly by all-year residents, while fruits of a semi-parasitic dwarf shrub Osyris alba, a vine Rubia tenuifolia and a tree P. palaestina were removed mainly by transients. Rhamnus was visited by most bird species more often than expected from its relative abundance, and the highest density of bird-deposited seeds was found under Rhamnus. Scrub clearings were largely avoided by birds (...)
131 citations
TL;DR: European buckthorn (Rhamnus cathartica), a prevalent invasive shrub in relict woodlands throughout Northeastern Illinois, alters certain soil properties in a manner that may have importance for the long-term conservation management of these systems.
126 citations
TL;DR: WUE during drought was significantly enhanced by inoculation with Glomus intraradices in Olea europaea ssp sylvestris, but not in Rhamnus lycioides, suggesting some of the interspecific variability in δ13C observed for aridland plant communities may be due to different physiological responses to mycorrhization.
Abstract: During a revegetation field experiment in Southeast Spain, we measured foliar carbon isotope ratios (δ13C) and gas exchange parameters in order to evaluate the influence of arbuscular mycorrhizal (AM) infection on the water use efficiency (WUE) of two semiarid woodland species. WUE during drought was significantly enhanced by inoculation with Glomus intraradices in Olea europaea ssp sylvestris, but not in Rhamnus lycioides. While Olea is a long-lived, slow-growing evergreen tree with a conservative water use strategy, Rhamnus is a drought-deciduous shrub with a shorter lifespan; these differences may explain their dissimilar patterns of physiological response to inoculation with the same AM fungus. Differences in δ13C and WUE between Olea and Rhamnus were larger when comparing AM inoculated than non-inoculated seedlings. This result suggests that some of the interspecific variability in δ13C observed for aridland plant communities may be due to different physiological responses to mycorrhization.
93 citations
TL;DR: Among the six species, the increase in biomass from understory to open environments was negatively correlated with growing season survival in the understory, indicating that release from physiological constraints does not explain the success of the invasive species.
91 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 1 |
| 2019 | 2 |
| 2017 | 3 |
| 2016 | 6 |
| 2015 | 11 |