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Registro Completo
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Biblioteca(s): |
Epagri-Sede. |
|
Data corrente: |
14/04/2011 |
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Data da última atualização: |
14/04/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
-- - -- |
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Autoria: |
COUTO, M.; RASEIRA, M. C. B.; HERTER, F. G.; SILVA, J. B. |
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Afiliação: |
Epagri |
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Título: |
Influence of high temperatures at blooming time on pollen production and fruit set of peach CVS. maciel and granada. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Acta Horticulturae, Leuven, v. 872, n. , p. 225-230, 2010. |
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Idioma: |
Inglês |
|
Notas: |
ISSN, 05677572 |
|
Conteúdo: |
Regions under subtropical conditions commonly have temperature
fluctuations and at late winter time the occurrence of temperatures above 25°C
followed by less than 10°C is not rare. This is probably one of the causes for
production inconsistency over the years. Several field and laboratory tests were
conducted using two peach cultivars, ?Granada? and ?Maciel?, aiming to study the
effect of high temperature (≥25°C) at blooming period. In vitro pollen viability at
different temperatures was tested using a culture medium prepared with 1% agar
plus 10% sugar in distilled water. Pollen production per anther was also evaluated.
In field experiments, branches of these two cultivars were submitted to temperatures
2 to 8°C above field temperatures, using plastic bags or transparent bottles (pet) or
covering a whole plant with a portable greenhouse. The observed parameters were:
in vitro pollen viability, pollen production per anther (total and normal pollen
grains), length of pistils and fruit set. In laboratory tests, pollen germination was
lower at 32°C, than at 24 or 28°C for both cultivars. Higher temperatures did not
significantly influence length of pistils, probably because the field temperatures at
the tested years were already high. Total pollen production did not differ among
tested temperatures, however percentage of normal pollen grains was significantly
lower in ?Granada? at higher temperatures and did not differ for ?Maciel?. The same
was true for fruit set. The conclusion is that the negative effect of high temperatures
at blooming time is larger for ?Granada? than for ?Maciel?. MenosRegions under subtropical conditions commonly have temperature
fluctuations and at late winter time the occurrence of temperatures above 25°C
followed by less than 10°C is not rare. This is probably one of the causes for
production inconsistency over the years. Several field and laboratory tests were
conducted using two peach cultivars, ?Granada? and ?Maciel?, aiming to study the
effect of high temperature (≥25°C) at blooming period. In vitro pollen viability at
different temperatures was tested using a culture medium prepared with 1% agar
plus 10% sugar in distilled water. Pollen production per anther was also evaluated.
In field experiments, branches of these two cultivars were submitted to temperatures
2 to 8°C above field temperatures, using plastic bags or transparent bottles (pet) or
covering a whole plant with a portable greenhouse. The observed parameters were:
in vitro pollen viability, pollen production per anther (total and normal pollen
grains), length of pistils and fruit set. In laboratory tests, pollen germination was
lower at 32°C, than at 24 or 28°C for both cultivars. Higher temperatures did not
significantly influence length of pistils, probably because the field temperatures at
the tested years were already high. Total pollen production did not differ among
tested temperatures, however percentage of normal pollen grains was significantly
lower in ?Granada? at higher temperatures and did not differ for ?Maciel?. The same
was true for fruit set. The c... Mostrar Tudo |
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Palavras-Chave: |
Adaptation; Pessego; Pollen viability; Prunus persica. |
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Categoria do assunto: |
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Marc: |
LEADER 02160naa a2200181 a 4500
001 1075710
005 2011-04-14
008 2010 bl uuuu u00u1 u #d
100 1 $aEpagri
245 $aInfluence of high temperatures at blooming time on pollen production and fruit set of peach CVS. maciel and granada.
260 $c2010
500 $aISSN, 05677572
520 $aRegions under subtropical conditions commonly have temperature fluctuations and at late winter time the occurrence of temperatures above 25°C followed by less than 10°C is not rare. This is probably one of the causes for production inconsistency over the years. Several field and laboratory tests were conducted using two peach cultivars, ?Granada? and ?Maciel?, aiming to study the effect of high temperature (≥25°C) at blooming period. In vitro pollen viability at different temperatures was tested using a culture medium prepared with 1% agar plus 10% sugar in distilled water. Pollen production per anther was also evaluated. In field experiments, branches of these two cultivars were submitted to temperatures 2 to 8°C above field temperatures, using plastic bags or transparent bottles (pet) or covering a whole plant with a portable greenhouse. The observed parameters were: in vitro pollen viability, pollen production per anther (total and normal pollen grains), length of pistils and fruit set. In laboratory tests, pollen germination was lower at 32°C, than at 24 or 28°C for both cultivars. Higher temperatures did not significantly influence length of pistils, probably because the field temperatures at the tested years were already high. Total pollen production did not differ among tested temperatures, however percentage of normal pollen grains was significantly lower in ?Granada? at higher temperatures and did not differ for ?Maciel?. The same was true for fruit set. The conclusion is that the negative effect of high temperatures at blooming time is larger for ?Granada? than for ?Maciel?.
653 $aAdaptation
653 $aPessego
653 $aPollen viability
653 $aPrunus persica
773 $tActa Horticulturae, Leuven$gv. 872, n. , p. 225-230, 2010.
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