Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie最新文献_第8页

Botanique - Sur les anthérozoïdes et la double copulation sexuelle chez les végétaux angio-spermes 植物学-关于植物被子精子中的类胡萝卜素和双性交媾

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01346-4

Guignard Léon

引用次数: 13

Developmental and evolutionary hypotheses for the origin of double fertilization and endosperm 双受精和胚乳起源的发育和进化假说

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01326-9

William E Friedman

{"title":"Developmental and evolutionary hypotheses for the origin of double fertilization and endosperm","authors":"William E Friedman","doi":"10.1016/S0764-4469(01)01326-9","DOIUrl":"10.1016/S0764-4469(01)01326-9","url":null,"abstract":"<div><p>The discovery of a second fertilization event that initiates endosperm in flowering plants, just over a century ago, stimulated intense interest in the evolutionary history and homology of endosperm, the genetically biparental embryo-nourishing tissue that is found only in angiosperms. Two alternative hypotheses for the origin of double fertilization and endosperm have been invoked to explain the origin of the angiosperm reproductive syndrome from a typical non-flowering seed plant reproductive syndrome. Endosperm may have arisen from a developmental transformation of a supernumerary embryo derived from a rudimentary second fertilization event that first evolved in the ancestors of angiosperms (endosperm homologous with an embryo). Conversely, endosperm may represent the developmental transformation of the cellular phase of non-flowering seed plant female gametophyte ontogeny that was later sexualized by the addition of a second fertilization event in a strongly progenetic female gametophyte (endosperm homologous with a female gametophyte). For the first time, explicit developmental and evolutionary transitions for both of these hypotheses are examined and compared. In addition, current data that may be congruent with either of these hypotheses are discussed. It is clear that much remains to be accomplished if the evolutionary significance of the process of double fertilization and the formation of endosperm is to be fully understood.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 6","pages":"Pages 559-567"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(01)01326-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87181471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 56

Centenaire de la publication de Léon Guignard sur la double fécondation chez les plantes à fleurs leon Guignard发表《开花植物的双重受精》一百周年

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01345-2

引用次数: 0

Double fertilization in flowering plants: Discovery, study methods and mechanisms 开花植物双受精:发现、研究方法和机制

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01325-7

Jean-Emmanuel Faure

引用次数: 26

Self-incompatibility in flowering plants: The Brassica model 开花植物的自交不亲和:芸苔属植物的模式

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01323-3

Thierry Gaude, Didier Cabrillac

引用次数: 9

Reproduction et développement des plantes à fleurs 开花植物的繁殖和发育

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01320-8

Christian Dumas

引用次数: 2

Male sterility in plants: occurrence, determinism, significance and use 植物雄性不育的发生、决定、意义及利用

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-06-01 DOI: 10.1016/S0764-4469(01)01324-5

Françoise Budar, Georges Pelletier

引用次数: 231

‘Vertition’ of integumental organs in mites revisited: a case of fluctuating asymmetry 螨虫被皮器官的“旋转”:一个波动不对称的案例

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01314-2

Maurice Leponce, Mundon-Izay Noti, Vincent Bauchau, Georges Wauthy

{"title":"‘Vertition’ of integumental organs in mites revisited: a case of fluctuating asymmetry","authors":"Maurice Leponce, Mundon-Izay Noti, Vincent Bauchau, Georges Wauthy","doi":"10.1016/S0764-4469(01)01314-2","DOIUrl":"10.1016/S0764-4469(01)01314-2","url":null,"abstract":"<div><p>Vertition in mites is defined as a meristic variation for a bilateral integumental organ with a separate genetic control for each body side. A prominent hypothesis expressed by Grandjean is the role of vertition in the evolutionary trend towards a reduced number of hair-like organs (mechano- and/or chemo-receptors) known to have occurred in many mite groups. Observations on leg setae in the two-spotted spider mite <em>Tetranychus urticae</em> do not support this hypothesis. Meristic variation for leg setae rather conforms to the notion of fluctuating asymmetry: the difference between the number of leg setae on the right and left sides of the body had a unimodal distribution with a mean of zero. Moreover, lack of heritability for left/right absences of leg setae in an inbred laboratory strain suggests that vertition could be purely environmental. It is therefore argued that meristic variation for hair-like organs in mites is caused by random developmental accidents not corrected by homeostatic mechanisms normally resulting in a perfect bilateral symmetry.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 5","pages":"Pages 425-431"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(01)01314-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72569989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Récepteurs 5-HT1B de la sérotonine et effets antidépresseurs des inhibiteurs de recapture sélectifs de la sérotonine 5-HT1B 5-羟色胺受体和选择性5-羟色胺再摄取抑制剂的抗抑郁作用

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01332-4

Alain M Gardier , Anne-Cécile Trillat , Isabelle Malagié , Denis David , Martine Hascoët , Marie-Claude Colombel , Pascale Jolliet , Christian Jacquot , René Hen , Michel Bourin

{"title":"Récepteurs 5-HT1B de la sérotonine et effets antidépresseurs des inhibiteurs de recapture sélectifs de la sérotonine","authors":"Alain M Gardier , Anne-Cécile Trillat , Isabelle Malagié , Denis David , Martine Hascoët , Marie-Claude Colombel , Pascale Jolliet , Christian Jacquot , René Hen , Michel Bourin","doi":"10.1016/S0764-4469(01)01332-4","DOIUrl":"10.1016/S0764-4469(01)01332-4","url":null,"abstract":"<div><p>We used knockout mice and receptor antagonist strategies to investigate the contribution of the serotonin (5-hydroxytryptamine, 5-HT) 5-HT<sub>1B</sub> receptor subtype in mediating the effects of selective serotonin reuptake inhibitors (SSRIs). Using in vivo intracerebral microdialysis in awake mice, we show that a single systemic administration of paroxetine (1 or 5 mg/kg, i.p.) increased extracellular serotonin levels 〚5-HT〛<sub>ext</sub> in the ventral hippocampus and frontal cortex of wild-type and mutant mice. However, in the ventral hippocampus, paroxetine at the two doses studied induced a larger increase in 〚5-HT〛<sub>ext</sub> in knockout than in wild-type mice. In the frontal cortex, the effect of paroxetine was larger in mutants than in wild-type mice at the 1 mg/kg dose but not at 5 mg/kg. In addition, either the absence of the 5-HT<sub>1B</sub> receptor or its blockade with the mixed 5-HT<sub>1B/1D</sub> receptor antagonist, GR 127935, potentiates the effect of a single administration of paroxetine on 〚5–HT〛<sub>ext</sub> more in the ventral hippocampus than in the frontal cortex. Furthermore, we demonstrate that SSRIs decrease immobility in the forced swimming test; this effect is absent in 5-HT<sub>1B</sub> knockout mice and blocked by GR 127935 in wild-type suggesting therefore that activation of 5-HT<sub>1B</sub> receptors mediate the antidepressant-like effects of SSRIs. Taken together these data demonstrate that 5-HT<sub>1B</sub> autoreceptors appear to limit the effects of SSRI on dialysate 5-HT levels particularly in the hippocampus while presynaptic 5-HT<sub>1B</sub> heteroreceptors are likely to be required for the antidepressant activity of SSRIs.</p></div>","PeriodicalId":100306,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie","volume":"324 5","pages":"Pages 433-441"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0764-4469(01)01332-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75180277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

A putative insect intracellular endosymbiont stem clade, within the Enterobacteriaceae, infered from phylogenetic analysis based on a heterogeneous model of DNA evolution 肠杆菌科中一个假定的昆虫细胞内共生茎枝，基于DNA进化的异质模型进行系统发育分析推断

Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie Pub Date : 2001-05-01 DOI: 10.1016/S0764-4469(01)01328-2

Hubert Charles, Abdelaziz Heddi, Yvan Rahbe

引用次数: 45