Portulacaceae
Leader proteinase of beet yellows virus functions in long-distance transport. (1/7)
The 66-kDa leader proteinase (L-Pro) of the Beet yellows virus (BYV) possesses a nonconserved N-terminal domain and a conserved, papain-like C-terminal domain. Previous work revealed that the N-terminal domain functions in RNA amplification, whereas the C-terminal domain is required for autoproteolysis. Alanine-scanning mutagenesis was applied to complete the functional analysis of L-Pro throughout the virus life cycle. This analysis indicated that the C-terminal domain of L-Pro, in addition to being required for proteolysis, also functions in RNA amplification and that these two functions are genetically separable. Examination of the role of L-Pro in BYV cell-to-cell movement revealed that none of the 20 examined replication-competent mutants was movement defective. In contrast, six of the L-Pro mutations affected the long-distance transport of BYV to various degrees, whereas three mutations completely abolished the transport. Because these mutations were located throughout the protein molecule, both domains of L-Pro function in virus transport. We conclude that in addition to previously identified functions of L-Pro, it also serves as the BYV long-distance transport factor. (+info)Operation of the xanthophyll cycle and degradation of D1 protein in the inducible CAM plant, Talinum triangulare, under water deficit. (2/7)
Changes in photochemical activity induced by water deficit were investigated in Talinum triangulare, an inducible CAM plant. The aim was to analyse the interactions between C3 photosynthesis, induction and activity of CAM, photosynthetic energy regulation and the mechanisms responsible for photoprotection and photoinhibition under water stress. Gas exchange, chlorophyll a fluorescence, titratable acidity, carotenoid composition and relative contents of the PSII reaction centre protein (D1) were measured. A decrease in xylem tension (psi) from -0.14 to -0.2 MPa substantially decreased daytime net CO2 assimilation and daily carbon gain, and induced CAM, as shown by CO2 assimilation during the night and changes in titratable acidity; a further decrease in psi decreased nocturnal acid accumulation by 60%. Non-photochemical quenching of chlorophyll a fluorescence (NPQ) increased with water deficit, but decreased with a more severe drought (psi below -0.2 MPa), when CAM activity was low. NPQ was lower at 0900 h (during maximum decarboxylation rates) than at 1400 h, when malate pools were depleted. Down-regulation of PSII activity related to the rise in NPQ was indicated by a smaller quantum yield of PSII photochemistry (phiPSII) in droughted compared with watered plants. However, phiPSII was larger at 0900 h than at 1400 h. The de-epoxidation state of the xanthophyll cycle increased with drought and was linearly related to NPQ. Intrinsic quantum yield of PSII (FV/FM) measured at dusk was also lower in severely stressed plants than in controls. Under maximum photosynthetic photon flux and high decarboxylation rates of organic acids, the D1 content in leaves of droughted plants showing maximal CAM activity was identical to the controls; increased drought decreased D1 content by more than 30%. Predawn samples had D1 contents similar to leaves sampled at peak irradiance, with no signs of recovery after 12 h of darkness. It is concluded that under mild water stress, early induction of CAM, together with an increased energy dissipation by the xanthophyll cycle, prevents net degradation of D1 protein; when water deficit is more severe, CAM and xanthophyll cycle capacities for energy dissipation decline, and net degradation of D1 proceeds. (+info)Evolutionary physiology: the extent of C4 and CAM photosynthesis in the genera Anacampseros and Grahamia of the Portulacaceae. (3/7)
(+info)Polyploidy associated with altered and broader ecological niches in the Claytonia perfoliata (Portulacaceae) species complex. (4/7)
(+info)Cytogeography and genome size variation in the Claytonia perfoliata (Portulacaceae) polyploid complex. (5/7)
(+info)Modelling temperature, photoperiod and vernalization responses of Brunonia australis (Goodeniaceae) and Calandrinia sp. (Portulacaceae) to predict flowering time. (6/7)
(+info)Plant-pollinator interactions over 120 years: loss of species, co-occurrence, and function. (7/7)
(+info)Portulacaceae is a family of dicotyledonous plants, primarily found in temperate and tropical regions, characterized by fleshy leaves, succulent stems, and small flowers, with the most well-known genus being Portulaca, which includes the popular annual flowering plant Portulaca grandiflora (commonly known as moss rose or purslane).
Portulacaceae is not a medical term, but a taxonomic category in botany. It refers to the purslane family of flowering plants, which contains around 20-30 genera and about 400-500 species. Some members of this family have been used in traditional medicine, such as Portulaca oleracea (common purslane), which has been used to treat various ailments including gastrointestinal disorders and skin conditions. However, it's important to note that the use of plants for medicinal purposes should be done under the guidance of a healthcare professional, as they can have potential side effects or interact with other medications.
'Portulaca' is a genus of annual or perennial succulent plants, including the common purslane (P. oleracea), known for their fleshy leaves and stems, and typically used in traditional medicine for treating various ailments such as skin conditions, gastrointestinal disorders, and wounds, due to their anti-inflammatory, antimicrobial, and antioxidant properties.
"Portulaca" is a botanical term that refers to a genus of plants commonly known as "purslanes." These are mostly annual or perennial herbs or subshrubs, often with succulent leaves and stems. They belong to the family Portulacaceae.
However, in a medical context, 'Portulaca' is not typically used as a medical term or diagnosis. If you're referring to a specific medical use or component of a purslane plant, please provide more context so I can give a more accurate response.
Portulaca1
- The Portulacaceae are a family of flowering plants, comprising 115 species in a single genus Portulaca. (wikipedia.org)
Purslane2
- PORTULACACEAE, the Purslane Family by J. Richard Abbott. (nybgshop.org)
- Spring beauty, Claytonia virginica, is classified in the Portulacaceae or Purslane Farnily. (vnps.org)
Claytonia1
- Flowering phenology and seed set in Claytonia virginica (Portulacaceae). (mn.us)
Flora2
- This study was conducted during the years 2018 to 2020 to evaluate Portulacaceae of Flora in the Taif area in the Kingdom of Saudi Arabia at different altitudes (Area 1 =1700 m, Area 2 =1500 m, Area 3 =1500 m, Area 4 =500 m Area 5 = 2200 m, and Area 6 = 2200 m). (bvsalud.org)
- Este estudo foi realizado durante os anos de 2018 a 2020 para avaliar Portulacaceae de flora na área de Taif, no Reino da Arábia Saudita , em diferentes altitudes (Área 1 = 1.700 m, Área 2 = 1.500 m, Área 3 = 1.500 m, Área 4 = 500 m, Área 5 = 2.200 m, e Área 6 = 2.200 m). (bvsalud.org)
Family1
- This Northeast American native is in the purslane family, Portulacaceae . (dig-itmag.com)
Talinum1
- Phemeranthus and Talinum (Portulacaceae) in New Mexico. (unm.edu)
Data1
- About 68 Portulacaceae in Chile and 68 in our data base. (chileflora.com)
