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Estimativa da variacao do numero de flores femininas efetivas do guaranazeiro. Repositório Alice
ESCOBAR, J.R..
Descreve-se metodo indireto, para estimar a epoca, variacao e magnitude da floracao feminina efetiva do guaranazeiro (Paullinia cupana HBK var. Sorbilis Mart. Ducke). O metodo consiste na utilizacao de dados individuais de producao de sementes secas por data de colheita, peso de uma smente seca e periodo de maturacao de frutos. Com base em dados de 412 plantas, a estimativa do numero de flores efetivas, para a safra de 1982, foi de 1.200 flores por planta, para as condicoes locais. A floracao iniciou-se no comeco de julho e finalizou na primeira semana de outubro; o pico maximo ocorreu na primeira quinzena de setembro.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fenologia; Polinizacao dirigida; Regiao amazonica; Paullinia cupana; Phenology; Controlled pollination; Amazon region.
Ano: 1985 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1000937
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Floral phenology, seed germination and hybrid plants of the Amerindian yam (Dioscorea trifida) Acta Amazonica
BEYERLEIN,Patrick; MENDES,Ângela M. S.; PEREIRA,Henrique S..
ABSTRACT The Amerindian yam (Dioscorea trifida) is a food plant native to the Amazon region. Several local varieties are cultivated by traditional family farmers for consumption and local trade. However, socioeconomic processes may be causing species genetic erosion. Knowledge about species sexual reproduction is essential for its conservation and genetic improvement. The objective of this study was to observe the floral phenology, to assess the germination and dormancy of seeds, to conduct controlled pollinations and to select hybrid plants of D. trifida with agronomic potential. Seed dormancy was confirmed and was broken by after-ripening at 28 oC and 80% RH. We carried out controlled pollinations between local landraces and cultivated the resulting...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazonia; Dioscoreaceae; Native food plant; Controlled pollination; Crossbreeding.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000300167
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Obtaining hybrids of cultivars and wild subspecies of cassava PAB
Silva,Dreid de Cerqueira Silveira da; Martins,Márcio Lacerda Lopes; Santos,Ariana Silva; Santos,Vanderlei da Silva; Alves,Alfredo Augusto Cunha; Ledo,Carlos Alberto da Silva.
Abstract: The objective of this work was to evaluate the crossability between cassava (Manihot esculenta subsp. esculenta) cultivars and the subspecies M. esculenta subsp. flabellifolia and M. esculenta subsp. peruviana. Plants from the BRS Jari, BRS Formosa, BRS Verdinha, and BGM 2050 (Equador 72) cultivars were crossed with the two subspecies. During flowering, at pre-anthesis, pistillate flowers were covered with a nylon bag and staminate flowers on the same inflorescence were emasculated. The staminate flowers were collected and placed in flasks previously labeled and sterilized with alcohol; some fresh flowers were stored at room temperature due to asynchronous flowering. The crosses were made between 10 a.m. and 2 p.m. After pollination, the flowers...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Manihot esculenta; Controlled pollination; Hybrid; Plant breeding; Wild relative species.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000200182
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The site of self-incompatibility action in cupuassu (Theobroma grandiflorum) Rev. Bras. Bot.
Ramos,Alessandra R.; Venturieri,Giorgini A.; Cuco,Silvia M.; Castro,Neuza M..
Cupuassu (Theobroma grandiflorum (Willd. ex Spreng.) Schumann) is a fruit tree that is attracting attention in Brazil and also in other tropical countries. Its pulp is used to prepare ice-cream, juices, jellies and many other home-made sweets. This species has a very low fecundity, attributed to problems with pollination and self-incompatibility, noted as being restrictive to the agronomic productivity of the species. Controlled pollinations between compatible and incompatible parents were made and flowers were collected at three times: 24, 48 and 72 h after pollinations, during the floral seasons of 1995 and 1998. In flowers collected 24 h after pollination, in both compatible and incompatible crosses, around 70% of ovules showed egg apparatus without...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Controlled pollination; Infertility; Ovule clearing.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000300013
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