| somatic embryogenesis from vegetative shoot apices of mature trees of pinus patula. | embryogenic cultures were initiated and established from apical shoots of mature trees of three genotypes of pinus patula scheide et deppe. factors affecting initiation, including cold pretreatment, basal medium composition, growth regulators and gelling agent concentration, and the effect of partial desiccation on somatic embryo maturation were investigated. cold pretreatment of thick sections (0.5-1.0 mm) of apical shoots at 2 degrees c for 3 days on 0.3% activated charcoal induced white mucil ... | 2005 | 15519981 |
| plasticity in mesophyll volume fraction modulates light-acclimation in needle photosynthesis in two pines. | acclimation potential of needle photosynthetic capacity varies greatly among pine species, but the underlying chemical, anatomical and morphological controls are not entirely understood. we investigated the light-dependent variation in needle characteristics in individuals of pinus patula schlect. & cham., which has 19-31-cm long pendulous needles, and individuals of p. radiata d. don., which has shorter (8-17-cm-long) stiffer needles. needle nitrogen and carbon contents, mesophyll and structura ... | 2007 | 17472940 |
| impacts of individual tree species on carbon dynamics in a moist tropical forest environment. | in the moist tropical forest biome, which cycles carbon (c) rapidly and stores huge amounts of c, the impacts of individual species on c balances are not well known. in one of the earliest replicated experimental sites for investigating growth of native tropical trees, we examined traits of tree species in relation to their effects on forest c balances, mechanisms of influence, and consequences for c sequestration. the monodominant stands, established in abandoned pasture in 1988 at la selva bio ... | 2010 | 20597292 |
| [relative abundance and microhabitat use by the frog geobatrachus walkeri (anura: strabomantidae) in two habitats of sierra nevada de santa marta, colombia]. | geobatrachus walkeri belongs to a monotypic frog genus endemic to the san lorenzo area, sierra nevada de santa marta, colombia. this species has been categorized as endangered because of its small distribution area and the decline in the extent and quality of its habitat. it inhabits two forest types with different composition and structure, the native secondary forest and a pine plantation (dominated by pinus patula). to compare the relative abundance and microhabitat use of this species in the ... | 2011 | 21721245 |
| genetic analysis of growth, morphology and pathogenicity in the f(1) progeny of an interspecific cross between fusarium circinatum and fusarium subglutinans. | fusarium circinatum and fusarium subglutinans are two distinct species in the gibberella fujikuroi species complex. a genetic linkage map produced from an interspecific cross between these species was used to identify quantitative trait loci (qtls) associated with variation in mycelial growth and morphology of colony margins (cms) in the 94 f(1) progeny. mycelial growth was assessed by measuring culture size at 25°c and 30°c, while cm morphology was characterized in the parents and assessed in t ... | 2011 | 21872187 |
| [biogeochemical cycles in natural forest and conifer plantations in the high mountains of colombia]. | plant litter production and decomposition are two important processes in forest ecosystems, since they provide the main organic matter input to soil and regulate nutrient cycling. with the aim to study these processes, litterfall, standing litter and nutrient return were studied for three years in an oak forest (quercus humboldtii), pine (pinus patula) and cypress (cupressus lusitanica) plantations, located in highlands of the central cordillera of colombia. evaluation methods included: fine lit ... | 2011 | 22208100 |
| Chemical composition and biological activities of essential oils of Pinus patula. | Essential oils isolated from needles of Pinus patula by hydrodistillation were analyzed by gas chromatography-flame ionization detection (GC-FID) and gas chromatography mass spectrometry (GC-MS). Thirty-eight compounds were identified, representing 98.3% of the total oil. The oil was rich in monoterpene hydrocarbons (62.4%), particularly alpha-pinene (35.2%) and beta-phellandrene (19.5%). The in vitro antifungal assay showed that P. patula oil significantly inhibited the growth of 9 plant pathog ... | 2011 | 22164801 |
| comparison of soil bacterial communities of pinus patula of nilgiris, western ghats with other biogeographically distant pine forest clone libraries. | the bacterial community structure of the rhizosphere and non-rhizosphere soil of pinus patula, found in the nilgiris region of western ghats, was studied by constructing 16s rrna gene clone libraries. in the rhizosphere and non-rhizosphere soil clone libraries constructed, 13 and 15 bacterial phyla were identified, respectively. the clone libraries showed the predominance of members of culturally underrepresented phyla like acidobacteria and verrucomicrobia. the alphaproteobacteria and acidobact ... | 2012 | 23274880 |
| novel taxa in the fusarium fujikuroi species complex from pinus spp. | the pitch canker pathogen fusarium circinatum has caused devastation to pinus spp. in natural forests and non-natives in commercially managed plantations. this has drawn attention to the potential importance of fusarium species as pathogens of forest trees. in this study, we explored the diversity of fusarium species associated with diseased pinus patula, p. tecunumanii, p. kesiya and p. maximinoi in colombian plantations and nurseries. plants displaying symptoms associated with a f. circinatum- ... | 2015 | 26955193 |
| random forest (rf) wrappers for waveband selection and classification of hyperspectral data. | hyperspectral data collected using a field spectroradiometer was used to model asymptomatic stress in pinus radiata and pinus patula seedlings infected with the pathogen fusarium circinatum. spectral data were analyzed using the random forest algorithm. to improve the classification accuracy of the model, subsets of wavebands were selected using three feature selection algorithms: (1) boruta; (2) recursive feature elimination (rfe); and (3) area under the receiver operating characteristic curve ... | 2016 | 26903567 |
| combined de novo and genome guided assembly and annotation of the pinus patula juvenile shoot transcriptome. | pines are the most important tree species to the international forestry industry, covering 42 % of the global industrial forest plantation area. one of the most pressing threats to cultivation of some pine species is the pitch canker fungus, fusarium circinatum, which can have devastating effects in both the field and nursery. investigation of the pinus-f. circinatum host-pathogen interaction is crucial for development of effective disease management strategies. as with many non-model organisms, ... | 2015 | 26652261 |
| an improved protocol for intact chloroplasts and cpdna isolation in conifers. | performing chloroplast dna (cpdna) isolation is considered a major challenge among different plant groups, especially conifers. isolating chloroplasts in conifers by such conventional methods as sucrose gradient and high salt has not been successful. so far, plastid genome sequencing protocols for conifer species have been based mainly on long-range pcr, which is known to be time-consuming and difficult to implement. | 2014 | 24392157 |
| in situ enzyme aided adsorption of soluble xylan biopolymers onto cellulosic material. | the functional properties of cellulose fibers can be modified by adsorption of xylan biopolymers. the adsorption is improved when the degree of biopolymers substitution with arabinose and 4-o-methyl-glucuronic acid (meglca) side groups, is reduced. α-l-arabinofuranosidase (abfb) and α-d-glucuronidase (agua) enzymes were applied for side group removal, to increase adsorption of xylan from sugarcane (saccharum officinarum l) bagasse (bh), bamboo (bambusa balcooa) (bm), pinus patula (pp) and eucaly ... | 2016 | 27083357 |
| fungal planet description sheets: 281-319. | novel species of fungi described in the present study include the following from south africa: alanphillipsia aloeicola from aloe sp., arxiella dolichandrae from dolichandra unguiscati, ganoderma austroafricanum from jacaranda mimosifolia, phacidiella podocarpi and phaeosphaeria podocarpi from podocarpus latifolius, phyllosticta mimusopisicola from mimusops zeyheri and sphaerulina pelargonii from pelargonium sp. furthermore, barssia maroccana is described from cedrus atlantica (morocco), codinae ... | 2014 | 25737601 |
| low herbivory among targeted reforestation sites in the andean highlands of southern ecuador. | insect herbivory constitutes an important constraint in the viability and management of targeted reforestation sites. focusing on young experimental stands at about 2000 m elevation in southern ecuador, we examined foliar damage over one season as a function of tree species and habitat. native tree species (successional hardwood: cedrela montana and tabebuia chrysantha; fast-growing pioneer: heliocarpus americanus) have been planted among prevailing local landcover types (abandoned pasture, seco ... | 2016 | 26963395 |