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Biological studies on japanese bees - X. Differences in flower relationships between a japanese and an european honeybees

Miyamoto, Setsu
Fonte: INRA - Instituto Nacional de Investigação Agronômica da França Publicador: INRA - Instituto Nacional de Investigação Agronômica da França
Tipo: Journal Article-postprint
EN
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16.88%

Biological studies on japanese bees - XII. Flowers relationships of five species of bees belonging to the genus osmia

Miyamoto, Setsu
Fonte: INRA - Instituto Nacional de Investigação Agronômica da França Publicador: INRA - Instituto Nacional de Investigação Agronômica da França
Tipo: Journal Article-postprint
EN
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16.88%

The effect of distance from pollinizer varieties on the fruit set on trees in plum and apple orchards

Free, J.B.
Fonte: INRA - Instituto Nacional de Investigação Agronômica da França Publicador: INRA - Instituto Nacional de Investigação Agronômica da França
Tipo: Journal Article-postprint
EN; ENGLISH
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16.88%
The fruit set on plum trees decreased greatly with increase in distance from pollinizer trees, and less so with increase in distance from honey-bee colonies. Trees adjacent to pollinizers had a greater set on the sides facing the pollinizers than on their far sides. Parts of trees touching "bouquets" had a greater set than parts without bouquets. In an apple orchard with main variety and pollinizer trees in separate blocks, the fruit set was greater on the main variety trees adjacent to the pollinizers than on trees farther away. In an apple orchard with a pollinizer tree as every third tree in every third row, main variety trees had a greater fruit set, more seeds per fruit, and more carpels with seeds per fruit, on the sides near to their adjacent pollinizers than on their far sides. The fruit set, number of seeds per fruit, and number of carpels with seed per fruit, were greater the nearer the trees were to the adjacent pollinizer. These results are discussed in relation to the foraging behaviour of honey-bees and to methods of arranging pollinizer and main variety trees in orchards.

Influence d’un supplément alimentaire sur le développement des colonies d’abeilles domestiques (Apis mellifera, Linnaeus 1758) au Québec

Martin, Georges
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
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28.19%
La malnutrition est identifiée comme l’un des facteurs potentiellement responsables des mortalités élevées de colonies d’abeilles des dernières années au Québec. Pour contrer cela, les apiculteurs donnent des suppléments de pollen à leurs colonies, mais les impacts d’une telle pratique à diverses périodes sont méconnus. Les effets de la disponibilité du pollen sur le développement de colonies d’abeilles ont été mesurés pendant 3 différentes périodes : au printemps, durant la pollinisation de la canneberge et à la fin de l’été. À chacune des périodes correspondait une expérience distincte utilisant 40 colonies. Pour chaque expérience, des conditions d’abondance de supplément de pollen et de restriction de pollen naturel étaient créées chez les colonies pendant un mois selon un plan d’expérience factorielle 2x2. L’élevage du couvain et la récolte de miel ont été mesurés jusqu’à la fin de l’été (début de l’été suivant pour l’expérience de fin d’été). Au printemps, les colonies restreintes en pollen naturel ont élevé 18% moins de couvain (p<0.05) pendant la période de restriction et 11% de moins à la fin de l’été alors que l’utilisation du supplément n’a eu aucun effet (p>0.05). Les colonies supplémentées durant la pollinisation des canneberges ont élevé moins de couvain (p<0.05) à la fin de l’été. Pour l’expérience de fin d’été...

Current bee-poisoning problem and pollination service

Johansen, Carl; Shipman, H.J.
Fonte: INRA - Instituto Nacional de Investigação Agronômica da França Publicador: INRA - Instituto Nacional de Investigação Agronômica da França
EN
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La régulation génique chez Solanum chacoense : de la pollinisation jusqu’à l’embryogenèse

Tebbji, Faiza
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
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38.45%
Chez les végétaux supérieurs, l’embryogenèse est une phase clé du développement au cours de laquelle l’embryon établit les principales structures qui formeront la future plante et synthétise et accumule des réserves définissant le rendement et la qualité nutritionnelle des graines. Ainsi, la compréhension des évènements moléculaires et physiologiques menant à la formation de la graine représente un intérêt agronomique majeur. Toutefois, l'analyse des premiers stades de développement est souvent difficile parce que l'embryon est petit et intégré à l'intérieur du tissu maternel. Solanum chacoense qui présente des fleurs relativement grande facilitant l’isolation des ovules, a été utilisée pour l’étude de la biologie de la reproduction plus précisément la formation des gamètes femelles, la pollinisation, la fécondation et le développement des embryons. Afin d'analyser le programme transcriptionnel induit au cours de la structuration de ces étapes de la reproduction sexuée, nous avons mis à profit un projet de séquençage de 7741 ESTs (6700 unigènes) exprimés dans l’ovule à différents stades du développement embryonnaire. L’ADN de ces ESTs a été utilisé pour la fabrication de biopuces d’ADN. Dans un premier temps...

Rôle de la protéine ScFRK1 dans le développement du sac embryonnaire et son impact sur le guidage des tubes polliniques

Lafleur, Edith
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
FR
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16.88%
Le gène Solanum chacoense Fertilization-Related Kinase 1 (ScFRK1) code pour une protéine de la famille des MAPKK kinases exprimée spécifiquement dans les ovules. Son transcrit s’accumule principalement dans la zone micropylaire du sac embryonnaire à l’anthèse et diminue rapidement après pollinisation. Ces résultats suggèrent un rôle possible avant ou pendant la fécondation. Bien qu'aucune expression ne soit détectée dans le pollen à maturité, la protéine est cependant présente dans les cellules mères de microspores. Des plantes transgéniques sous-exprimant ScFRK1 ne montrent aucun phénotype au niveau des tissus végétatifs, mais présentent de petits fruits dépourvus de graines. L’étude microscopique du gamétophyte femelle révèle que son développement ne progresse pas au-delà du stade de la mégaspore fonctionnelle et une grande proportion de sacs embryonnaires anormaux est corrélée avec une faible expression de ScFRK1. De plus, la production de pollen viable diminue en fonction de la baisse des niveaux d’expression du gène, ce qui pourrait s’expliquer par un problème au cours de la mitose I. Puisque l’intégrité du sac embryonnaire est essentielle au guidage des tubes polliniques, nous avons conçu un système de guidage semi-in vivo permettant d’évaluer la capacité des ovules du mutant ScFRK1 à les attirer. L’attraction est sévèrement affectée dans de telles conditions...

Morphological and RAPD marker evidence of gene flow in open-pollinated populations of Cucurbita moschata interplanted with C. argyrosperma

Cuevas-Marrero, H.; Wessel-Beaver, L.
Fonte: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France) Publicador: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France)
Tipo: Poster
EN; ENG
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16.88%
The tropical pumpkins Cucurbita moschata Duchesne and C. argyrosperma Huber are often found growing together. Both C. argyrosperma subsp. argyrosperma (the domesticated cushaw squash) and the wild species C. argyrosperma subsp. sororia (L.H. Bailey) Merrick & Bates are found together in Central America. Several reports indicate that plants displaying a phenotype combining traits of both species occur, suggesting gene flow between species. This research studied gene flow between species by evaluating progenies from field plantings of C. argyrosperma (both subspecies) interplanted with C. moschata and allowed to open-pollinate. The progenies evaluated were from C. argyrosperma seed parents. Morphological and species-specific RAPD markers demonstrated that C. moschata genes were introgressed into these open-pollinated progeny.; Cucurbitaceae 2008. IX EUCARPIA Meeting. Avignon (France), May 21-24th, 2008

Methods of isolation of Cucumis sativus and C. melo pollen grains and their utilization in in vitro pollination

Skálová, D.; Navrátilová, B.; Lebeda, A.
Fonte: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France) Publicador: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France)
Tipo: Poster
EN; ANG
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16.88%
Optimizing manipulation with pollen grains is necessary for successful in vitro pollination. This pollination can be used for overcoming crossing barriers in interspecific hybridization in the genus Cucumis. Pollen grains from Cucumis sativus and C. melo were isolated by various methods. Different techniques of centrifugation were compared with direct isolation of pollen grains from anthers. The viability of pollen grains was evaluated and their ability to form pollen tubes was tested. Three isolation media (NLN, YST and VB) and two cultivation media (YS and CP) were used. Then pollen grains were cultivated with ovules of C. sativus and the level of regeneration was observed. The growing and green ovules were considered as the lowest level and the highest level was the formation of callus.; Cucurbitaceae 2008. IX EUCARPIA Meeting. Avignon (France), May 21-24th, 2008

Influence of honey bees brood pheromone on the production of triploid watermelon

Guerra Sanz, J.M.; Roldán Serrano, A.
Fonte: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France) Publicador: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France)
Tipo: Poster
EN; ENG
Relevância na Pesquisa
16.88%
Honey bee brood pheromone has been used for boosting the rate of flower visitation by honey bees in cultures of a triploid watermelon cultivar with diploid plants as pollen-donors. The application of brood pheromone had several consequences on the quality production parameters of the triploid culture, especially on the average of fruits per plant, the weight of fruits and on the Brix degree, all these parameters were higher and with statistically different significance from the control. The foraging of the bees was monitored by the number of visits to flowers and by the number of seeds per fruit of the pollen-donor plants: both variables were higher in the plot with brood pheromone than in the control. This is the first time that brood pheromone has been applied to increase the pollination on triploid watermelon culture and it looks like a promising technique to be applied in other cultures where a high frequency of pollinator visits is needed for a good quality production.; Cucurbitaceae 2008. IX EUCARPIA Meeting. Avignon (France), May 21-24th, 2008

The utilization of honey bees for the production of seeds of cucumber, cornichon type

Calin, M.; Ambarus, S.; Cristea, T.O.; Falticeanu, M.; Stoian, L.; Popa, C.M.; Dumbrava, M.M.
Fonte: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France) Publicador: INRA. Centre de Recherche d'Avignon. Unité Génétique et Amélioration des Fruits et Légumes, Montfavet (France)
Tipo: Poster
EN; ENG
Relevância na Pesquisa
16.88%
The paper presents the results of researches performed upon the use of honeybees in the seed production of three hybrids in Cornichon type of Cucumis sativus (‘Cornisa’, ‘Cornibac’, and ‘Cornirom’). Honey-bees are very efficient in pollination of cucumber flowers, resulting in an increase of seed quantities per fruit ranging from 150 % (‘Cornirom’) to 214 % (‘Cornisa’), as compared to hand pollination.; Cucurbitaceae 2008. IX EUCARPIA Meeting. Avignon (France), May 21-24th, 2008

La pollinisation du lavandin - I. : Ses effets sur les fleurs; Lavandin pollination - I. : Its effects on flowers

Barbier, M.E.C.
Fonte: INRA - Instituto Nacional de Investigação Agronômica da França Publicador: INRA - Instituto Nacional de Investigação Agronômica da França
Tipo: Journal Article-postprint
FR
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27.59%

Considerações sôbre o emprego de variedades sintéticas no melhoramento do milho: I - sintéticos simples

Brieger, F. G.
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf
Publicado em 30/12/1950 POR
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17.59%
1) The author gives a short resume of the principal breeding methods in maize. Since mass selection cannot be considered as a method for improving corn, two groups of methods remain: the hybrid corn method and the method of the synthetics. Reasons are given why it seems important that the latter should be applied, after a further improvement of the breeding technique and its theoreticsl basis. The method may still be subdivided into the method of simple synthetics and of balanced synthetics. In the preparation of the former, only the following two points have to be considered: selection for combining ability before the constitution of the synthetic, and mass selection aganst weak descendants of consanguineous matings after the establishment of the synthetic. In the case of the balanced synthetics, a third element is added: selection against or rather previous elination of all hybrids which give too strong mendelian segregation in a synthetic. 2) The first proposal to use synthetics has been made by Hayes and Gardner in 1919. Positive results were obtained howewer only much later, since before 1940 the importance of selection for combining ability was not recognized. Hayes, Rinke and Tsiang (1944) obtained a synthetic which equalled the double hybrid Minhybrid 403.Lonnquist (1949) obtained a synthetic which eaqulled the double hybrid US13. Roberts...

Biologia da Polinização: interações entre as abelhas (Hym., Apoidea) e as flores de Vassobia breviflora (Solanaceae)

TAURA, HILDA MASSAKO; LAROCA, SEBASTIÃO
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 06/01/2005 POR
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Biologia da Polinização — As interações entre as abelhas (Hym., Apoidea) e as flores de Vassobia breviflora são estudadas nos Passeio Público (Curitiba, Brasil), entre setembro e outubro de 1987 e de setembro a novembro de 1991. Assim como em 1992 e 1993, para coleta de dados complementares. As espécies de abelhas mais comuns foram: Apis mellifera, Plebeia emerina, Partamona helleri, Caenohalictus mourei and Bicolletes tauraphilus. Evidências comportamentais fazem crer que uma abelha oligolética, Bicolletes tauraphilus, é a principal polinizadora das flores da espécie no Paraná oriental. ABSTRACT Pollination biology — Interaction between the bees (Hym., Apoidea) and the flowers of Vassobia breviflora in a public garden (Passeio Público, Curitba, Brazil), are studied from September to October, 1987 and from September to November, 1991, as well as in the blooming season of 1992 and 1993, for complementary data. The predominant species of bees were as follows: Apis mellifera, Plebeia emerina, Partamona helleri, Caenohalictus mourei and Bicolletes tauraphilus. Behavioral evidences indicate that the principal pollinator is Bicolletes tauraphilus, an olicolectic species of Paracolletini in easthern Paraná (Brazil). RÉSUMÉ La biologie de la pollinisation—Interaction entre les abeilles (Hym....

Uma comunidade de abelhas silvestres (Hym., Apoidea) de Pato Branco (PR-Brasil): diversidade, fenologia, recursos florais e aspectos biogeográficos

JAMHOUR, JORGE; LAROCA, SEBASTIÃO
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 06/01/2005 POR
Relevância na Pesquisa
16.88%
Abundância relativa, fenologia e visitas das abelhas silvestres (Apoidea) às flores de uma área restrita em Pato Branco (PR-Brasil) são estudadas. Os resultados são comparados com os de outros biótopos sul-brasileiros, especialmente com aqueles de Caçador (Santa Catarina) (dados de ORTH, 1983 — Tese de Mestrado, UFPR) e Guará (dados BAZÍLIO, 1997 — Paraná-Tese de Mestrado, UFPR). A amostragem foi feita seguindo-se as técnicas de Sakagami & Laroca (cf. SAKAGAMI, LAROCA & MOURE, 1967 — J. Fac. Sci., Hokkaido Univ., 16: 253-291; Laroca, 1972). O censo, feito de novembro de 1995 a janeiro de 1997, e resultou em 1.079 espécimes coletados, pertencentes a 151 espécies. Halictidae predominou em espécies e Apidae em indivíduos. As porcentagens de cada família em espécies e em indivíduos (entre parênteses) foram as seguintes: Halictidae 45,0 % (25,1 %), Anthophoridae 18,6 % (13,9 %), Andrenidae 14,6 % (8,5 %), Megachilidae 11,9 % (3,2 %), Apidae 7,8 % (48,6 %), Colletidae 2,0 % (0,7 %). As espécies de Xylocopinae 9,9 % (7,0 %) e Anthophoridae (excl. Xylocopinae) 8,6 % (6,9 %). Em nível específico, Trigona (Trigona) spinipes (Fabricius) (15,8 % do total de indivíduos) e Plebeia (Plebeia) droryana (9,1 %) predominaram. A fenologia de Apoidea em Pato Branco (Paraná...