scholarly journals Türkiye’de Orman, Park ve Fidanlıklarda Görülen Phytophthora Kök Çürüklüğü Hastalıkları ve Korunma Önlemleri

2018 ◽  
Vol 6 (6) ◽  
pp. 770
Author(s):  
Seçil Akıllı Şimşek ◽  
Yakup Zekai Katırcıoğlu ◽  
Salih Maden
Keyword(s):  
Forest Tree ◽  
Phytophthora Species ◽  
Horse Chestnut ◽  
Forest Trees ◽  
Sweet Chestnut ◽  
Root Rots ◽  
Fourth Species ◽  
Leaf Blights ◽  
Almost All ◽  
Ornamental Trees

Phytophthora species, as a member of Oomycetes are important plan diseases occurring on almost all of the annual and perennial plants and rapidly killing the plants by producing root, collar rots and leaf blights. The first Phytophthora study on forest trees in Turkey was made on oak species which is the most widespread tree in the country. Seven Phytophthora species, namely P. cinnamomi, P. citricola, P. cryptogea, P. gonapodyides, P. quercina, Phytophthora sp. 1 and Phytophthora sp. 2’ were found to cause dieback and death on oaks, P. quercina being the most frequently encountered. The second most common tree having Phytophthora infections is sweet chestnut and root rots caused by Phytophthora were determined everywhere chestnut grow in the country. Four species were found on chestnut and the most frequently occurring two species are P. cambivora and P. cinnamomi occurring in the inner part and in the coastal areas of the country respectively. The third and fourth species, P. plurivora and P. cryptogea were observed in the decreasing order respectively. From the above mentioned species, P. cambivora and P. cryptogea were also reported from black pine at one location in the newly reforested location. From the other forest trees; various Phytophthora species were reported; P. lacustris from narrow leaved ash, P. plurivora, P. occultans from boxwood, P. citrophthora and P. cactorum from horse chestnut, P. nicotianae from Ailanthus sp. Phytophthora diseases were also found in a few nurseries growing forest an ornamental trees. P. cinnamomi, P. cryptogea, P. cactorum, P. citricola, P. megasperma and P. syringae were found to cause disease on various forest tree saplings. Elaborate information on Phytophthora diseases is being given in the review.

Phänologische Trends bei den Waldbäumen in der Schweiz | Phenological trends regarding the forest trees in Switzerland

2005 ◽  
Vol 156 (6) ◽  
pp. 207-210 ◽  
Author(s):  
Claudio Defila
Keyword(s):  
Regional Differences ◽  
Early Growth ◽  
Horse Chestnut ◽  
Forest Trees ◽  
Spring Season ◽  
Arrival Times ◽  
The Past ◽  
Early Arrival ◽  
Southern Side ◽  
The Alps

Numerous publications are devoted to plant phenological trends of all trees, shrubs and herbs. In this work we focus on trees of the forest. We take into account the spring season (leaf and needle development) as well as the autumn (colour turning and shedding of leaves) for larch, spruce and beech, and,owing to the lack of further autumn phases, the horse chestnut. The proportion of significant trends is variable, depending on the phenological phase. The strongest trend to early arrival in spring was measured for needles of the larch for the period between 1951 and 2000 with over 20 days. The leaves of the horse chestnut show the earliest trend to turn colour in autumn. Beech leaves have also changed colour somewhat earlier over the past 50 years. The trend for shedding leaves, on the other hand, is slightly later. Regional differences were examined for the growth of needles in the larch where the weakest trends towards early growth are found in Canton Jura and the strongest on the southern side of the Alps. The warming of the climate strongly influences phenological arrival times. Trees in the forest react to this to in a similar way to other plants that have been observed (other trees, shrubs and herbs).

Detection of oomycide-insensitive Phytophthora isolates in Maryland ornamental nurseries and Mid-Atlantic landscapes provide data for reconsidering management strategies

2021 ◽  
Author(s):  
Justine Beaulieu ◽  
Johanna Del Castillo Munera ◽  
Yilmaz Balci
Keyword(s):  
Growth Rate ◽  
Mycelial Growth ◽  
Management Strategies ◽  
Resistance Management ◽  
Phytophthora Species ◽  
Oak Forests ◽  
Relative Growth ◽  
Off Label ◽  
Potting Media ◽  
Almost All

Five Phytophthora species comprising a total of 243 isolates (77 P. cinnamomi, 23 P. citrophthora, 18 P. multivora, 18 P. pini, and 107 P. plurivora) were screened for sensitivity to mefenoxam, fosetyl-Al, dimethomorph, dimethomorph + ametoctradin and fluoxastrobin using amended agar assays. Mefenoxam-insensitive isolates were detected within P. cinnamomi (4%), P. multivora (11%), and P. plurivora (12%) even at approximately 2.5x the recommended label rate. These isolates were also insensitive to higher (off-label) concentrations of fluoxastrobin. Concentrations of dimethomorph (400 g/mL) and dimethomorph + ametoctradin (100 g/mL) were mostly effective in mycelial growth inhibition, but two P. plurivora isolates were insensitive, suggesting that resistance management is required. All mefenoxam-insensitive isolates were sensitive to fosetyl-Al at the label rate. Surprisingly, the populations of P. cinnamomi from mid-Atlantic oak forests included insensitive isolates. With almost all species, isolates recovered from asymptomatic hosts (e.g., soil/potting media collected of randomly selected asymptomatic hosts) had a significantly greater relative growth rate when compared to isolates recovered from symptomatic hosts (e.g., isolates recovered from lesions or wilted plants). These findings suggest that mefenoxam should no longer be used to manage oomycetes in Maryland ornamental nurseries and that the use of fluoxastrobin should be limited.

Greenhouse gas fluxes from an oil palm plantation on mineral soil in Indonesia undergoing riparian restoration 

2021 ◽  
Author(s):  
Stella White ◽  
Ribka Sionita Tarigan ◽  
Anak Agung Ketut Aryawan ◽  
Edgar Turner ◽  
Sarah Luke ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Greenhouse Gas ◽  
Oil Palm ◽  
Forest Tree ◽  
Native Forest ◽  
Forest Trees ◽  
Riparian Restoration ◽  
Enrichment Planting ◽  
Mineral Soils ◽  
Ghg Fluxes

<p>Oil palm (OP) growers are under pressure to reduce their environmental impact. Ecosystem function and biodiversity are at the forefront of the issue, but what effect do changes in management practices have on greenhouse gas (GHG) fluxes from plantations? </p><p>The Riparian Ecosystem Restoration in Tropical Agriculture (RERTA) Project is a collaboration between the University of Cambridge and the SMART Research Institute in Riau, Indonesia. This project explores the ecological changes resulting from the restoration of riparian margins between plantations and watercourses. Four management strategies were applied on both sides of a river to create 50m riparian buffers, 400m in length: (1) A control treatment of no restoration, the removal of mature OP and replanting of young OP to the river margin; (2) Little to no agricultural management of mature OP; (3) Clearance of mature OP and enrichment planting with native forest trees; (4) Little or no agricultural management of mature OP and enrichment planting with native forest trees. Here we present a specific objective to investigate the effect of riparian restoration – and related changes in soil characteristics, structure and vegetation cover – on fluxes of N<sub>2</sub>O, CH<sub>4</sub> and CO<sub>2</sub> from mineral soils.</p><p>The experimental site began as a mature OP plantation, with monthly background measurements taken between January and April 2019. Palms were felled in April 2019 and monthly sampling was resumed when replanting and restoration began, in October 2019. We measured GHGs using static chambers; 6 in each riparian treatment and 16 in the actual OP plantation, 40 chambers in total. Samples were analysed using GC-FID/µECD.</p><p>Background measurements before felling showed high variability, but indicated no difference between the four experimental plots and the rest of the plantation. Fluxes measured following replanting were also highly variable, with no significant differences observed between treatments. N<sub>2</sub>O fluxes were relatively low before felling as the mature palms were no longer fertilised. Higher emissions were seen in the disturbed immature OP and forest tree treatments following replanting. Though the sites appeared to recover quickly and emission fluxes decreased after a few months, presumably as the soil settled and new vegetation began to grow. CH<sub>4</sub> uptake was seen in the immature OP treatment immediately after replanting. In subsequent months no clear trends of CH<sub>4</sub> uptake or emission were observed, with the greatest variability generally seen in the forest tree treatment. CH<sub>4</sub> emissions increased in October 2020 with the beginning of the rainy season, most notably in mature OP and mature OP with forest tree treatments. Following restoration CO<sub>2</sub> emissions were higher in treatments with established plant communities – mature OP and mature OP with forest trees.</p><p>These results suggest that riparian restoration had no significant effect on GHG fluxes from mineral soils, and would not alter the overall GHG budget of a plantation. If there is no additional GHG burden and riparian restoration results in enhancing biodiversity and ecosystem services as well as improving water quality, it will be a viable management option to improve the environmental impact of an OP plantation.</p>

scholarly journals Advances and Perspectives of Transgenic Technology and Biotechnological Application in Forest Trees

2021 ◽  
Vol 12 ◽  
Author(s):  
Yiyi Yin ◽  
Chun Wang ◽  
Dandan Xiao ◽  
Yanting Liang ◽  
Yanwei Wang
Keyword(s):  
Genetic Transformation ◽  
Molecular Genetic ◽  
Forest Tree ◽  
Breeding Cycle ◽  
Forest Trees ◽  
Transgenic Technology ◽  
Forest Tree Breeding ◽  
Exogenous Dna ◽  
Advantages And Disadvantages ◽  
Gm Trees

Transgenic technology is increasingly used in forest-tree breeding to overcome the disadvantages of traditional breeding methods, such as a long breeding cycle, complex cultivation environment, and complicated procedures. By introducing exogenous DNA, genes tightly related or contributed to ideal traits—including insect, disease, and herbicide resistance—were transferred into diverse forest trees, and genetically modified (GM) trees including poplars were cultivated. It is beneficial to develop new varieties of GM trees of high quality and promote the genetic improvement of forests. However, the low transformation efficiency has hampered the cultivation of GM trees and the identification of the molecular genetic mechanism in forest trees compared to annual herbaceous plants such as Oryza sativa. In this study, we reviewed advances in transgenic technology of forest trees, including the principles, advantages and disadvantages of diverse genetic transformation methods, and their application for trait improvement. The review provides insight into the establishment and improvement of genetic transformation systems for forest tree species. Challenges and perspectives pertaining to the genetic transformation of forest trees are also discussed.

A DESCRIPTIVE LIST OF NATURAL AND ARTIFICIAL INTERSPECIFIC HYBRIDS IN NORTH AMERICAN FOREST-TREE GENERA

1939 ◽  
Vol 17c (12) ◽  
pp. 411-444 ◽  
Author(s):  
L. P. V. Johnson
Keyword(s):  
North American ◽  
Interspecific Hybrids ◽  
Forest Tree ◽  
Forest Trees ◽  
Tabular Form

Over 400 hybrids involving 28 North American genera of forest trees are described in tabular form with the object, primarily, of providing useful information for the forest-tree breeder. The genera involved are: Abies, Acer, Aesculus, Alnus, Arbutus, Betula, Carya, Castanea, Catalpa, Cyprus, Crataegus, Cupressus, Gleditsia, Ilex, Juglans, Larix, Magnolia, Picea, Pinus, Platanus, Populus, Quercus, Robinia, Salix, Taxus, Tilia, Tsuga, and Ulmus.

scholarly journals Occurrence of Phytophthora multivora and Phytophthora plurivora in the Czech Republic

2013 ◽  
Vol 49 (No. 4) ◽  
pp. 155-164 ◽  
Author(s):  
M. Mrázková ◽  
K. Černý ◽  
M. Tomšovský ◽  
V. Strnadová ◽  
B. Gregorová ◽  
...  
Keyword(s):  
Czech Republic ◽  
Ornamental Plants ◽  
Phytophthora Species ◽  
Forest Trees ◽  
Entire Area ◽  
The Czech Republic ◽  
Level Of Invasion ◽  
Elevational Distribution ◽  
High Level ◽  
South Moravia

Beginning in 2006, a survey of two related Phytophthora species, P. multivora and P. plurivora, was performed in the Czech Republic. Both pathogens were distributed throughout a broad range of environments including forest and riparian stands and probably became naturalised in the country. The two species differed in their frequency and elevational distribution. P. multivora was less frequent, but commonly occurred in the lowest regions such as Central Bohemia and South Moravia, i.e. areas which generally exhibit a high level of invasion. This species was isolated primarily from Quercus robur and found to be involved in oak decline. Moreover it poses a high risk to other forest trees. P. plurivora was distributed in a broad range of elevations over the entire area. A substrate specificity was detected in P. plurivora – the isolates from forest trees were more aggressive to such trees than the isolates from ericaceous ornamental plants.  

scholarly journals Fate of forest tree biotechnology facing climate change

2021 ◽  
Vol 70 (1) ◽  
pp. 117-136
Author(s):  
M. R. Ahuja
Keyword(s):  
Climate Change ◽  
Somatic Embryogenesis ◽  
Loblolly Pine ◽  
Tree Species ◽  
Forest Tree ◽  
Future Climate Change ◽  
Forest Trees ◽  
Forest Tree Species ◽  
Tree Biotechnology

Abstract Woody plants have been cultured in vitro since the 1930s. After that time much progress has been made in the culture of tissues, organs, cells, and protoplasts in tree species. Tree biotechnology has been making strides in clonal propagation by organogenesis and somatic embryogenesis. These regeneration studies have paved the way for gene transfer in forest trees. Transgenics from a number of forest tree species carrying a variety of recombinant genes that code for herbicide tolerance, pest resistance, lignin modification, increased woody bio-mass, and flowering control have been produced by Agrobacterium-mediated and biolistic methods, and some of them are undergoing confined field trials. Although relatively stable transgenic clones have been produced by genetic transformation in trees using organogenesis or somatic embryogenesis, there were also unintended unstable genetic events. In order to overcome the problems of randomness of transgene integration and instability reported in Agrobacterium-mediated or biolistically transformed plants, site-specific transgene insertion strategies involving clustered regularly interspaced short palindromic repeats (CRISPR-Cas9) platform offer prospects for precise genome editing in plants. Nevertheless, it is important to monitor phenotypic and genetic stability of clonal material, not just under greenhouse conditions, but also under natural field conditions. Genetically modified poplars have been commercialized in China, and eucalypts and loblolly pine are expected to be released for commercial deployment in USA. Clonal forestry and transgenic forestry have to cope with rapid global climate changes in the future. Climate change is impacting species distributions and is a significant threat to biodiversity. Therefore, it is important to deploy Strategies that will assist the survival and evolution of forest tree species facing rapid climate change. Assisted migration (managed relocation) and biotechnological approaches offer prospects for adaptation of forest trees to climate change.

Incompatibility in forest trees

1975 ◽  
Vol 188 (1092) ◽  
pp. 313-326 ◽  
Keyword(s):  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Genetic Load ◽  
Forest Tree ◽  
Breeding Systems ◽  
Tube Growth ◽  
Alternative Mechanism ◽  
Forest Trees ◽  
Forest Tree Breeding ◽  
Interspecific Incompatibility

Despite the great importance for forest tree breeding, very limited knowledge is yet available about the breeding systems of forest trees. Where incompatibility has been studied in the hardwoods; patterns have been observed which confirm the general rules detected for other angiosperms. Self- and interspecific incompatibility at the level of pollen tube growth has been reported for example in Betula and Alnus . In Alnus one case of unilateral interspecific incompatibility has been found. Self-incompatibility has, so far, not been reported from the conifers. Inter-specific incompatibility in the form of the arrestment of the pollen tube growth in the nucellus tissue has been observed in Picea and is particularly clear in Pinus crosses between the subgenera and Haploxylon and Diploxylon , but also within the Diploxylon -group. The nature of the incompatibility mechanism is still unknown, but serological differences related to the behaviour in the crosses has been detected in birch and pine pollen. It is suggested that the complex polysaccharidic composition of the cell walls and membranes might form a specific stereochemical basis for the incompatibility reaction. The presence of a combination of self-pollination, polyembryony and genetic load is discussed as an alternative mechanism favouring outbreeding in the Gymnosperms.

The savanna tree Acacia polyacantha facilitates the establishment of riparian forests in Serengeti National Park, Tanzania

2009 ◽  
Vol 25 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Gregory J. Sharam ◽  
A. R. E. Sinclair ◽  
Roy Turkington ◽  
Aerin L. Jacob
Keyword(s):  
Tree Species ◽  
Natural Regeneration ◽  
National Park ◽  
Seedling Survival ◽  
Forest Tree ◽  
Riparian Forests ◽  
Forest Trees ◽  
Grass Cover ◽  
Serengeti National Park ◽  
Acacia Polyacantha

Abstract:Forests are being converted to grasslands and croplands across Africa and natural regeneration of forests is typically poor. In Serengeti National Park, Tanzania, the savanna tree species Acacia polyacantha established in riparian grasslands and forest trees subsequently established within these stands. We examined the conditions for establishment of: (1) A. polyacantha and (2) riparian (non-Acacia) forests. Fire was excluded from three grassland areas for 5 y allowing A. polyacantha to establish during 1999 when dry-season rainfall was high. The seedlings of forest tree species did not establish in grasslands, but were found in large A. polyacantha stands (> 0.3 ha) with reduced grass cover (< 10%), higher cover of herbs (> 80%) and thorny shrubs (> 90%). Seeding survival was high in large stands (0.87 y−1), but declined in artificial canopy gaps due to the ingrowth of grasses (0.21 y−1) and subsequent fires (0.07 y−1). Shrub removal also reduced seedling survival (0.46 y−1) due to browsing by antelope. We propose that: (1) A. polyacantha establishes in pulses perhaps as infrequently as twice per century, and (2) riparian forests in Serengeti have established via facilitation under larger stands where shade excludes grass, and therefore fires and thorny shrubs exclude browsers.

Sign in / Sign up

Export Citation Format

Share Document