排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
2.
Armelin Vinicius Araújo Thomsen Mikkel Thy Teixeira Mariana Teodoro Florindo Luiz Henrique Bayley Mark Wang Tobias 《Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology》2019,189(3-4):425-440
Journal of Comparative Physiology B - All vertebrates possess baroreceptors monitoring arterial blood pressure and eliciting reflexive changes in vascular resistance and heart rate in response to... 相似文献
3.
Paul M. Sanders Anhthu Q. Bui Koen Weterings K. N. McIntire Yung-Chao Hsu Pei Yun Lee Mai Thy Truong T. P. Beals R. B. Goldberg 《Sexual plant reproduction》1999,11(6):297-322
We identified Arabidopsis thaliana sterility mutants by screening T-DNA and EMS-mutagenized lines and characterized several male-sterile mutants with defects
specific for different anther processes. Approximately 44 and 855 sterile mutants were uncovered from the T-DNA and EMS screens,
respectively. Several mutants were studied in detail with defects that included the establishment of anther morphology, microspore
production, pollen differentiation, and anther dehiscence. Both non-dehiscencing and late-dehiscencing mutants were identified.
In addition, pollenless mutants were observed with either apparent meiotic defects and/or abnormalities in cell layers surrounding
the locules. Two mutant alleles were identified for the POLLENLESS3 locus which have defects in functional microspore production that lead to the degeneration of cells within the anther locules.
pollenless3–1 contains a T-DNA insertion that co-segregates with the mutant phenotype and pollenless3–2 has a large deletion in the POLLENLESS3 gene. The POLLENLESS3 gene has no known counterparts in the GenBank, but encodes a protein containing putative nuclear localization and protein-protein
interaction motifs. The POLLENLESS3 gene was shown recently to be the same as MS5, a previously described Arabidopsis
thaliana male-sterility mutant. Three genes were identified in the POLLENLESS3 genomic region: GENEY, POLLENLESS3, and β9-TUBULIN. The segment of the Arabidopsis
thaliana genome containing the POLLENLESS3 and β9-TUBULIN genes is duplicated and present on a different chromosome. Analysis of the POLLENLESS3 expression pattern determined that the 1.3-kb POLLENLESS3 mRNA is localized specifically within meiotic cells in the anther
locules and that POLLENLESS3 mRNA is present only during late meiosis.
Received: 15 October 1998 / Revision accepted: 19 November 1998 相似文献
4.
Juvik Ole Johan Nguyen Xuan Hong Thy Andersen Heidi Lie Fossen Torgils 《Phytochemistry Reviews》2016,15(2):161-195
Phytochemistry Reviews - After the sensational rediscovery of living exemplars of the Cretaceous relict Metasequoia glyptostroboides—a tree previously known exclusively from fossils from... 相似文献
5.
Jason Liang Pin Ng Samira Hassan Thy T. Truong Charles H. Hocart Carole Laffont Florian Frugier Ulrike Mathesius 《The Plant cell》2015,27(8):2210-2226
Initiation of symbiotic nodules in legumes requires cytokinin signaling, but its mechanism of action is largely unknown. Here, we tested whether the failure to initiate nodules in the Medicago truncatula cytokinin perception mutant cre1 (cytokinin response1) is due to its altered ability to regulate auxin transport, auxin accumulation, and induction of flavonoids. We found that in the cre1 mutant, symbiotic rhizobia cannot locally alter acro- and basipetal auxin transport during nodule initiation and that these mutants show reduced auxin (indole-3-acetic acid) accumulation and auxin responses compared with the wild type. Quantification of flavonoids, which can act as endogenous auxin transport inhibitors, showed a deficiency in the induction of free naringenin, isoliquiritigenin, quercetin, and hesperetin in cre1 roots compared with wild-type roots 24 h after inoculation with rhizobia. Coinoculation of roots with rhizobia and the flavonoids naringenin, isoliquiritigenin, and kaempferol, or with the synthetic auxin transport inhibitor 2,3,5,-triiodobenzoic acid, rescued nodulation efficiency in cre1 mutants and allowed auxin transport control in response to rhizobia. Our results suggest that CRE1-dependent cytokinin signaling leads to nodule initiation through the regulation of flavonoid accumulation required for local alteration of polar auxin transport and subsequent auxin accumulation in cortical cells during the early stages of nodulation. 相似文献
6.
7.
Swei A Rowley JJ Rödder D Diesmos ML Diesmos AC Briggs CJ Brown R Cao TT Cheng TL Chong RA Han B Hero JM Hoang HD Kusrini MD Le DT McGuire JA Meegaskumbura M Min MS Mulcahy DG Neang T Phimmachak S Rao DQ Reeder NM Schoville SD Sivongxay N Srei N Stöck M Stuart BL Torres LS Tran DT Tunstall TS Vieites D Vredenburg VT 《PloS one》2011,6(8):e23179
The disease chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis (Bd), has caused dramatic amphibian population declines and extinctions in Australia, Central and North America, and Europe. Bd is associated with >200 species extinctions of amphibians, but not all species that become infected are susceptible to the disease. Specifically, Bd has rapidly emerged in some areas of the world, such as in Australia, USA, and throughout Central and South America, causing population and species collapse. The mechanism behind the rapid global emergence of the disease is poorly understood, in part due to an incomplete picture of the global distribution of Bd. At present, there is a considerable amount of geographic bias in survey effort for Bd, with Asia being the most neglected continent. To date, Bd surveys have been published for few Asian countries, and infected amphibians have been reported only from Indonesia, South Korea, China and Japan. Thus far, there have been no substantiated reports of enigmatic or suspected disease-caused population declines of the kind that has been attributed to Bd in other areas. In order to gain a more detailed picture of the distribution of Bd in Asia, we undertook a widespread, opportunistic survey of over 3,000 amphibians for Bd throughout Asia and adjoining Papua New Guinea. Survey sites spanned 15 countries, approximately 36° latitude, 111° longitude, and over 2000 m in elevation. Bd prevalence was very low throughout our survey area (2.35% overall) and infected animals were not clumped as would be expected in epizootic events. This suggests that Bd is either newly emerging in Asia, endemic at low prevalence, or that some other ecological factor is preventing Bd from fully invading Asian amphibians. The current observed pattern in Asia differs from that in many other parts of the world. 相似文献
8.
Sylvie E. Blondelle Ema Takahashi Kim Thy Dinh R.A. Houghten 《Journal of applied microbiology》1995,78(1):39-46
S.E. BLONDELLE, E. TAKAHASHI, K.T. DINH AND R.A. HOUGHTEN. 1995. A series of peptides identified through the use of synthetic hexapeptide combinatorial libraries (represented by the formula Ac-RRWWCO-NH2 ) were examined for their antimicrobial activity against five different micro-organisms. Their toxicity was also evaluated in an in vitro haemolytic assay. The peptides showed activity against the five micro-organisms, although higher activities were found against Gram-positive bacteria. Both growth inhibition and cell viability assays were carried out to demonstrate the bactericidal activities of these peptides against two of the micro-organisms tested. The dimeric cystine forms of these peptides were shown to have biological activities identical to the monomeric forms. 相似文献
9.
10.
Jodi Rowley Rafe Brown Raoul Bain Mirza Kusrini Robert Inger Bryan Stuart Guin Wogan Neang Thy Tanya Chan-ard Cao Tien Trung Arvin Diesmos Djoko T. Iskandar Michael Lau Leong Tzi Ming Sunchai Makchai Nguyen Quang Truong Somphouthone Phimmachak 《Biology letters》2010,6(3):336-338
With an understudied amphibian fauna, the highest deforestation rate on the planet and high harvesting pressures, Southeast Asian amphibians are facing a conservation crisis. Owing to the overriding threat of habitat loss, the most critical conservation action required is the identification and strict protection of habitat assessed as having high amphibian species diversity and/or representing distinctive regional amphibian faunas. Long-term population monitoring, enhanced survey efforts, collection of basic biological and ecological information, continued taxonomic research and evaluation of the impact of commercial trade for food, medicine and pets are also needed. Strong involvement of regional stakeholders, students and professionals is essential to accomplish these actions. 相似文献