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Search Results: 1 - 10 of 75465 matches for " Maluf Angela Maria "
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Plasticidade fenotípica em Amaranthus hybridus L. (Amaranthaceae)
Maluf, Angela Maria;
Acta Botanica Brasilica , 1994, DOI: 10.1590/S0102-33061994000200006
Abstract: during winter, a greenhouse trial was made in order to study the influence of light quality and quantity in the development of six amaranthus hybridus populations (five green and one purple biotypes). comparing plants that received direct insolation in the morning with those that were exposed to direct insolation in the afternoon, an increasing in the life cycle and a reduction in the height of the plants (around 50%), in leaf number (around 25%), in vegetative-k (67 to 90%) and reproductive biomassr (42 to 82) and in total production (51 to 83%) were observed in the first group of plants. however, reduction of the r/k relation reached the maximum of 50%, althougt some populations did not show this reduction but an increasing in this relation. amaranthus hybridus, as a weed r-strategist plant, showed a high phenotypic plasticity and under stress conditions the plant metabolism seems to be deviated towards reproductive structures in detriment of the vegetative growth.
Interferência interespecífica entre Amaranthus hybridus L. e Amaranthus viridis L.
Maluf, Angela Maria;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000500001
Abstract: the objective of this paper was to study the interspecific interference between two amaranthus species ? a. viridis and a. hybridus ?, the latter with two distinct biotypes (green and purple); both species ocurred in two localities. in the populations of each of the locations, some independent substitution trials were made in pots, and it could be concluded that the populations that germinate more readily are those which are superior in competition i.e., those that establish themselves and produce the largest number of seeds. there was a tendency for a. hybridus (green biotype) to dominate both a. hybridus (purple biotype) and a. viridis, and for a. hybridus (purple biotype) to dominate a. viridis. in mixed stands, there were cases where the species were competing for the same resources, cases where they were exploiting different environmental resources, and even cases of mutual antagonism.
Competi??o intra-específica entre Amaranthus hybridus L. e Amaranthus viridis L.
Maluf, Angela Maria;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000800001
Abstract: intraspecific competition trials were carried out for amaranthus viridis l. and a. hybridus l., the latter species with two distinct biotypes, a green and a purple type. three independent trials were made, with five different seed densities per pot for each species or biotype. in general terms, seeds that germinated promptly were responsible for the formation of the next generation, these early seedlings being more competitive. the carrying capacity was reached with 20 seeds per pot, no increase in the number of adult plants observed by increasing the seed density. this shows that the environmental suporting capacity, not the size of the seed bank in the soil, regulates the population size. a similar conclusion holds true for dry matter yield. under competition, the species a. hybridus - green biotype and a. viridis produced larger biomass for reproductive structures (22% to 34%) than a. hybridus - purple biotype (15% to 18%), the former species being therefore better r-strategists than the latter.
Aspectos fenológicos e germina??o de sementes de quatro popula??es de Eupatorium vauthierianum DC. (Asteraceae)
Maluf, Angela Maria;Wizentier, Betina;
Brazilian Journal of Botany , 1998, DOI: 10.1590/S0100-84041998000300002
Abstract: observations of flowering, fruit development and seed germination of four populations of e. vauthierianum in paranapiacaba region showed a discrepancy of about 20 days in the time of flowering. in may, the earliest populations presented heads with flowers in different stages of development and frutification occurred in mid-june. the complete development from flower buds to ripe fruits lasted approximately 55 days. the number of fruits per head varied from 10 to 26 and the percentage of fertile fruits from 5.5 to 100%. seed germination assays showed variations in the germination capability both within and among populations. germination was shown to be greater at 20°c than 25°c and 30°c. moreover, 12 hour photoperiod was shown to be more effective than full darkness for seed germination.
Aspectos fenológicos e germina o de sementes de quatro popula es de Eupatorium vauthierianum DC. (Asteraceae)
Maluf Angela Maria,Wizentier Betina
Brazilian Journal of Botany , 1998,
Abstract: Através do estudo do florescimento e da frutifica o de quatro popula es de Eupatorium vauthierianum, na regi o de Paranapiacaba, observou-se uma defasagem de florescimento de cerca de 20 dias entre as popula es mais precoces e as mais tardias. Para as mais precoces, os capítulos estavam com flores em diferentes estádios de desenvolvimento em maio e a plena frutifica o ocorreu em meados de junho. Decorreram cerca de 55 dias da fase de bot o floral até a de fruto maduro. O número de frutos (aquênios) por capítulo variou de 10 a 26 e a porcentagem de aquênios férteis por capítulo variou de 5,5 a 100%. Através do estudo da germina o observou-se varia o na capacidade germinativa, tanto dentro como entre as popula es estudadas. A temperatura de 20°C mostrou-se mais eficiente na promo o da germina o que 25°C e 30°C, o mesmo ocorrendo com o fotoperíodo de 12 horas quando comparado ao tratamento de escuro.
Caracteriza??o preliminar de Amaranthus hybridus L. e Amaranthus viridis L. através de isoenzimas
Maluf, Angela Maria;Martins, Paulo Sodero;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1991, DOI: 10.1590/S0071-12761991000100003
Abstract: through starch gel electrophoresis with horizontal migration, amaranthus hybridus green biotype was the only accession to show variation in esterase patterns, with presence or absence of a band in position 0.7. on the other hand, all species and biotypes (a.viridisand a.hybridus green and purple biotypes) showed variation in banding patterns for peroxidase. through the existence of common bands to both species, one could detect evidence for hybridization and introgression between them.
Secagem e armazenamento de sementes de cambuci
Maluf, Angela Maria;Pisciottano-Ereio, Waldete Aparecida;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000700012
Abstract: conservation of germinability of cambuci, campomanesia phaea (berg.) landr. (myrtaceae), seeds during storage is of prime importance for their better utilization and for scheduling nursery seedling production of this endangered species. the objetive of this work was to evaluate the effects of temperatures, substrates, desiccation levels and storage conditions on germination of cambuci seeds. trials were carried out over a three-year span, in bod incubators in a completely randomized design. seeds were obtained from mature fruits of eight trees planted in jardim botanico de s?o paulo, s?o paulo state, brazil. vermiculite and filter paper were the best germination substrates in both temperatures, 25oc and 30oc. storage in plastic bags in cold chamber (8±2oc) was superior to storage in paper bags at uncontrolled room temperature. after 240 day storage in plastic bags placed in cold chamber, percent germination of non-desiccated seed was 100%, whereas of seeds desiccated to 3% water content was 83.8%. after 180 days of storage in paper bags at room (uncontrolled) temperature, seeds had 48.8% germination, and germinability was totally lost after 240 days of storage.
Drying and storage of Eugenia involucrata DC. seeds
Maluf, Angela Maria;Bilia, Denise Augusta Camargo;Barbedo, Claudio José;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000300009
Abstract: the physiological quality of seeds of native species is important to produce healthy saplings and therefore guarantee the success of programs to recover disturbed vegetation. this reinforces the necessity for investigating the physiological quality of those seeds. to evaluate the effects of different drying rates on the germination, moisture content and storability of eugenia involucrata diaspores, mature fruits collected at mogi gua?u, sp, brazil had their epi- and mesocarps removed by washing and were dried at 30, 40 or 50oc until their water content was reduced from 57% (fresh diaspores) to 13% (final drying), totaling six drying levels. in a second experiment, diaspores had their moisture content reduced from 57% to 49%, at 30oc, totaling six drying levels (0h, 1h, 2h, 3h, 4h and 5h), and were kept for 180 days in plastic bags under cold storage. the drying rate had no effect on tolerance to desiccation by e. involucrata diaspores; water contents lower than 51% decreased both germinability and storability. diaspores can be stored for up to 180 days as long as their water content is reduced to 53% and they are kept inside plastic bags under cold storage.
Drying and storage of Eugenia involucrata DC. seeds
Maluf Angela Maria,Bilia Denise Augusta Camargo,Barbedo Claudio José
Scientia Agricola , 2003,
Abstract: The physiological quality of seeds of native species is important to produce healthy saplings and therefore guarantee the success of programs to recover disturbed vegetation. This reinforces the necessity for investigating the physiological quality of those seeds. To evaluate the effects of different drying rates on the germination, moisture content and storability of Eugenia involucrata diaspores, mature fruits collected at Mogi Gua u, SP, Brazil had their epi- and mesocarps removed by washing and were dried at 30, 40 or 50masculineC until their water content was reduced from 57% (fresh diaspores) to 13% (final drying), totaling six drying levels. In a second experiment, diaspores had their moisture content reduced from 57% to 49%, at 30masculineC, totaling six drying levels (0h, 1h, 2h, 3h, 4h and 5h), and were kept for 180 days in plastic bags under cold storage. The drying rate had no effect on tolerance to desiccation by E. involucrata diaspores; water contents lower than 51% decreased both germinability and storability. Diaspores can be stored for up to 180 days as long as their water content is reduced to 53% and they are kept inside plastic bags under cold storage.
Secagem e armazenamento de sementes de Eugenia brasiliensis Lam. (Grumixameira)
Kohoma, Sueli;Maluf, Angela Maria;Bilia, Denise Augusta Camargo;Barbedo, Claudio José;
Revista Brasileira de Sementes , 2006, DOI: 10.1590/S0101-31222006000100010
Abstract: there is an increasing need for investigations of the brazilian native tree species, mainly the physiological quality of their seeds. to evaluate the desiccation tolerance and storability of eugenia brasiliensis seeds, mature fruits collected at mogi-gua?u, sp, brazil and their seeds were removed by washing and were dried at 36oc until their water content was reduced from 48.9% (fresh seeds, wet basis) to 23.6% (final drying), totaling five drying levels. samples of each drying level were stored at 7oc in plastic bags for 270 days. results showed that water content lower than 43.1% decreased both germinability[germination potential] and storability. seeds with 48.9% water content showed 60% germination after 180 days and 19% after 270 days of storage inside plastic bags in a cold chamber. we concluded that e. brasiliensis seeds can be stored for 180 days at 7oc and are intolerant to drying at 36oc.
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