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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
27/02/1992 |
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Data da última atualização: |
27/02/1992 |
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Autoria: |
KITAT, F. M.; EL-AZAB, E. M.; ABD-EL-FATAH, A. E. |
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Afiliação: |
Faculty of Agriculture - Department of Horticulture. |
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Título: |
Comparative Behaviour of Chromosomes in Seedy and Seedless Guavas (Psidium Guajava L.) |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
Alexandra Journal of Agricultural Reseach, v.23, n.2, p.281-288, 1975. |
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Idioma: |
Inglês |
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Conteúdo: |
The cytological studies showed that the chromosome number was 22 in seedy guava und 33 in the seedless variety. In seedy guava the fertility of pollen grains was much higher than that in the seedless guava. The reduction in pollen fertility in the seedless guava might be due to the triploid condition. This triploid caused irregular chromosome behaviour which resulted in un-balanced gametes. |
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Thesagro: |
Fertilidade; Germinação; Maturação; Pólen. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00947naa a2200193 a 4500
001 1646503
005 1992-02-27
008 1975 bl --- 0-- u #d
100 1 $aKITAT, F. M.
245 $aComparative Behaviour of Chromosomes in Seedy and Seedless Guavas (Psidium Guajava L.)
260 $c1975
520 $aThe cytological studies showed that the chromosome number was 22 in seedy guava und 33 in the seedless variety. In seedy guava the fertility of pollen grains was much higher than that in the seedless guava. The reduction in pollen fertility in the seedless guava might be due to the triploid condition. This triploid caused irregular chromosome behaviour which resulted in un-balanced gametes.
650 $aFertilidade
650 $aGerminação
650 $aMaturação
650 $aPólen
700 1 $aEL-AZAB, E. M.
700 1 $aABD-EL-FATAH, A. E.
773 $tAlexandra Journal of Agricultural Reseach$gv.23, n.2, p.281-288, 1975.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
16/09/2021 |
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Data da última atualização: |
16/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
STAUDHAMMER, C. L.; WADT, L. H. de O.; KAINER, K. A.; CUNHA, T. A. da. |
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Afiliação: |
LUCIA HELENA DE OLIVEIRA WADT, CPAF-RO. |
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Título: |
Comparative models disentangle drivers of fruit production variability of an economically and ecologically important long-lived Amazonian tree. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Scientific Reports, v. 11, n. 2563, 2021. |
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Idioma: |
Inglês |
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Conteúdo: |
Trees in the upper canopy contribute disproportionately to forest ecosystem productivity. The large, canopy-emergent Bertholletia excelsa also supports a multimillion-dollar commodity crop (Brazil nut), harvested almost exclusively from Amazonian forests. B. excelsa fruit production, however is extremely variable within populations and years, destabilizing local harvester livelihoods and the extractive economy. To understand this variability, data were collected in Acre, Brazil over 10 years at two sites with similar climate and forest types, but different fruit production levels, despite their proximity (~ 30 km). One site consistently produced more fruit, showed less individual- and population-level variability, and had significantly higher soil P and K levels. The strongest predictor of fruit production was crown area. Elevation and sapwood area also significantly impacted fruit production, but effects differed by site. While number of wet days and dry season vapor pressure prior to flowering were significant production predictors, no climatic variables completely captured annual observed variation. Trees on the site with higher available P and K produced nearly three times more fruits, and appeared more resilient to prolonged drought and drier atmospheric conditions. Management activities, such as targeted fertilization, may shield income-dependent harvesters from expected climate changes and production swings, ultimately contributing to conservation of old growth forests where this species thrives. MenosTrees in the upper canopy contribute disproportionately to forest ecosystem productivity. The large, canopy-emergent Bertholletia excelsa also supports a multimillion-dollar commodity crop (Brazil nut), harvested almost exclusively from Amazonian forests. B. excelsa fruit production, however is extremely variable within populations and years, destabilizing local harvester livelihoods and the extractive economy. To understand this variability, data were collected in Acre, Brazil over 10 years at two sites with similar climate and forest types, but different fruit production levels, despite their proximity (~ 30 km). One site consistently produced more fruit, showed less individual- and population-level variability, and had significantly higher soil P and K levels. The strongest predictor of fruit production was crown area. Elevation and sapwood area also significantly impacted fruit production, but effects differed by site. While number of wet days and dry season vapor pressure prior to flowering were significant production predictors, no climatic variables completely captured annual observed variation. Trees on the site with higher available P and K produced nearly three times more fruits, and appeared more resilient to prolonged drought and drier atmospheric conditions. Management activities, such as targeted fertilization, may shield income-dependent harvesters from expected climate changes and production swings, ultimately contributing to conservation of old growth forest... Mostrar Tudo |
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Palavras-Chave: |
Amazonian forests; Amazonian tree. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/226080/1/Staudhammer-et-al-2021-DriversFruitProd-BNut.pdf
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Marc: |
LEADER 02125naa a2200181 a 4500
001 2134466
005 2021-09-16
008 2021 bl uuuu u00u1 u #d
100 1 $aSTAUDHAMMER, C. L.
245 $aComparative models disentangle drivers of fruit production variability of an economically and ecologically important long-lived Amazonian tree.$h[electronic resource]
260 $c2021
520 $aTrees in the upper canopy contribute disproportionately to forest ecosystem productivity. The large, canopy-emergent Bertholletia excelsa also supports a multimillion-dollar commodity crop (Brazil nut), harvested almost exclusively from Amazonian forests. B. excelsa fruit production, however is extremely variable within populations and years, destabilizing local harvester livelihoods and the extractive economy. To understand this variability, data were collected in Acre, Brazil over 10 years at two sites with similar climate and forest types, but different fruit production levels, despite their proximity (~ 30 km). One site consistently produced more fruit, showed less individual- and population-level variability, and had significantly higher soil P and K levels. The strongest predictor of fruit production was crown area. Elevation and sapwood area also significantly impacted fruit production, but effects differed by site. While number of wet days and dry season vapor pressure prior to flowering were significant production predictors, no climatic variables completely captured annual observed variation. Trees on the site with higher available P and K produced nearly three times more fruits, and appeared more resilient to prolonged drought and drier atmospheric conditions. Management activities, such as targeted fertilization, may shield income-dependent harvesters from expected climate changes and production swings, ultimately contributing to conservation of old growth forests where this species thrives.
653 $aAmazonian forests
653 $aAmazonian tree
700 1 $aWADT, L. H. de O.
700 1 $aKAINER, K. A.
700 1 $aCUNHA, T. A. da
773 $tScientific Reports$gv. 11, n. 2563, 2021.
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Embrapa Rondônia (CPAF-RO) |
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