Abstract:
:Costa Rican natural ecosystems are among the most diverse in the world. For this reason, we isolated strains of the entomopathogenic bacteria Bacillus thuringiensis (Bt) to determine their diversity, distribution and abundance. A total of 146 Bt strains were obtained from environmental samples collected from diverse natural ecosystems and life zones of Costa Rica. We recovered Bt strains from 71%, 63%, 61% and 54% of soil samples, fresh leaves, other substrates and leaf litter respectively. Bt was isolated in 65% of the samples collected in the humid tropical forest in national parks (Braulio Carrillo, Gandoca Manzanillo, Sierpe, Hitoy Cerere, and Cahuita), and in 59% of the samples collected in the dry tropical forest (Parque Nacional Marino las Baulas, Palo Verde and Santa Rosa). In the very humid tropical forest (Tortuguero) Bt was isolated in 75% of the samples and in the very humid tropical forest transition perhumid (Carara) it was found in 69% of the samples. The strains exhibit a diverse number, size and morphology of parasporal inclusion bodies: irregular (47%), oval (20%), bipyramidal (3%), bipyramidal and cubic (1%), bipyramidal, oval and irregular (5%) and bipyramidal, oval and cubic crystals (2%). Strains isolated from Braulio Carrillo, Tortuguero and Cahuita, presented predominantly irregular crystals. On the other hand, more than 60% of the isolates from Térraba-Sierpe and Hitoy-Cerere had medium oval crystals. Strains from Gandoca-Manzanillo, Palo Verde and Carara presented mainly combinations of oval and irregular crystals. Nevertheless, the greatest diversity in crystal morphology was observed in those from Santa Rosa, Llanos del Rio Medio Queso and Parque Marino las Baulas. Protein analyses of the crystal-spore preparations showed delta-endotoxin with diverse electrophoretic patterns, with molecular weights in the range of 20 to 160 kDa. Fifty six percent of the strains amplified with the cry2 primer, 54% with vip3, 20% with cry1, 9% with cry3-cry7 and 8% with cry8. The cry11 and cyt genes were found in 8% and 7% of the strains, respectively. When analyzed with specific primers for the cryl subfamily, 13 different genetic profiles were obtained. In addition, twenty-four strains did not amplify with any of the primers used, suggesting they contain novel cry genes. The diversity of Bt genes found in this collection indicates it could have great potential for the control of different species of insect pests. The toxicological characterization of the strains by bioassays against important insect pests will provide useful information about their potential use for the formulation of biological insecticides and their respective cry and vip genes for the transformation of crops to confer resistance to insects.
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Arrieta G,Espinoza AMdoi
10.15517/rbt.v54i1.13981subject
Has Abstractpub_date
2006-03-01 00:00:00pages
13-27issue
1eissn
0034-7744issn
2215-2075journal_volume
54pub_type
杂志文章abstract::Coral reefs are impacted by a range of environmental variables that affect their growth and survival, the main factors being the high irradiance and temperature fluctuations. Specimens of Pocillopora capitata Verrill 1864 were exposed to photosynthetically active radiation (PAR) and ultraviolet radiation (UVR) for 32 ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v58i1.5197
更新日期:2010-03-01 00:00:00
abstract::Sponges have an important ecological role in coral reef ecosystems. However, when compared to other benthic Phyla, it has been little researched. This research was focused in the variability of the community structure of sponges in three locations at Morrocoy National Park (Cayo Sombrero, Playa Mero and Punta Brava) e...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
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更新日期:2013-09-01 00:00:00
abstract::Cattleya trianae is an endemic species from the tropical rainforest in the Colombian Andes. Its survival is currently threatened due to habitat loss and commercial overexploitation. This study evaluates ten substrates, some organic (pine bark, coconut fiber and wood shavings), some inert icopor (polystyrene foam), veg...
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pub_type: 杂志文章
doi:10.15517/rbt.v55i2.6045
更新日期:2007-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1985-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v60i4.2182
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abstract::Two types of inclusion bodies were consistently observed under light microscopy in bean (Phaseolus vulgaris) leaf tissue infected with Bean rugose mosaic virus (BRMV), a species of the genus Comovirus, family Comoviridae. One type consisted of vacuolated inclusions found mainly in the cytoplasm of epidermal cells. The...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2000-12-01 00:00:00
abstract::Megalopta Smith, 1853, is a Neotropical genus of nocturnal or crepuscular bees. Two subgenera are recognized with most of its nearly 30 species placed in the nominate subgenus. Species of Megalopta s. str. are more commonly collected than species of Noctoraptor Engel et al. 1997, all presumably parasites of Megalopta ...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v58i1.5207
更新日期:2010-03-01 00:00:00
abstract::It is located 650m above sea level along the boundary between the North Caribbean and Pacific slopes, near the Southern end of the volcanic Guanacaste mountain range. In the early 1980s the lake's main outlet was dammed and the outflow was diverted into Arenal Reservoir. Lake Cote was first studied in 1990-1991, and l...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2014-06-01 00:00:00
abstract::Puerulus settlement of the western Atlantic spiny lobster, Panulirus argus, was monitored using modified Witham collectors from December 1996 to March 1998 at seven sites around St. Thomas, U.S. Virgin Islands. A total of 605 pueruli were collected from 553 samples for a catch per unit effort (CPUE) for all sites of 1...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2003-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2000-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1997-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2000-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章,评审
doi:
更新日期:1989-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2010-10-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2013-09-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2011-09-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2006-09-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2006-12-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1999-12-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2010-10-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1984-11-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2002-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1991-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v62i3.14063
更新日期:2014-09-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v64i3.18806
更新日期:2016-09-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:1994-08-01 00:00:00
abstract::The spawning of the muricid gastropod Plicopurpura pansa in the laboratory at 22-23 degrees C is described. Females deposited 1-20 capsules daily for at least 20 weeks, and produced up to 150 capsules each per spawning season. During spawning, egg clusters were formed consisting of hundreds of capsules of different ag...
journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:10.15517/rbt.v52i1.14702
更新日期:2004-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2012-03-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 评论,信件
doi:
更新日期:2016-06-01 00:00:00
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journal_title:Revista de biologia tropical
pub_type: 杂志文章
doi:
更新日期:2004-12-01 00:00:00