atividade da peroxidase durante o período hibernal de plantas de pessegueiro (prunus persica (l.) batsch.) cv. jubileu com e sem sintomas da morte precoce peroxidase activity during the rest period of peach trees (prunus persica (l.) batsch) cv. jubileu in plants with and without symptoms ofpeach-tree-short-life (ptsl)

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ID: 231022
2009
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Abstract
A morte precoce do pessegueiro (Prunus persica (L.) Batsch) é uma síndrome caracterizada por um colapso da planta durante a floração ou no início da brotação, após drástica redução da temperatura. O objetivo do presente trabalho foi determinar a atividade da peroxidase (UE min-1 g-1 MF) durante o período hibernal, em gemas e ramos de plantas de pessegueiro cv. Jubileu, com e sem sintomas de morte precoce. Foram conduzidos dois experimentos separadamente, um para cada tipo de tecido, em dois pomares próximos, ambos com quatro anos de implantação, situados na região colonial de Pelotas - RS, nas localidades de Santa Helena e Cascata. As amostras foram constituídas por dois tipos de tecidos (gemas e ramos) e foram coletadas em quatro datas (11-06, 11-07, 29-07 e 05-08) durante o inverno de 2003. As determinações da atividade da peroxidase nos tecidos foram realizadas no Laboratório de Fisiologia Vegetal da Embrapa Clima Temperado. As plantas com sintomas de morte precoce apresentaram, durante a dormência, maior atividade da peroxidase nos dois tipos de tecidos, quando comparadas com as plantas sem sintomas da síndrome. Provavelmente, o desencadeamento da síndrome provoca alterações na dormência das plantas afetadas, que resultam na antecipação da retomada do crescimento das gemas e na exposição dos tecidos recém-formados aos danos causados pelas baixas temperaturas. Os níveis populacionais donematoide-anelado (Mesocriconema xenoplax) e dos nematoides do gênero Helicotylenchus sp. foram superiores nas amostras de solo coletadas na rizosfera das plantas com sintomas de morte precoce do que os verificados nas amostras coletadas das plantas sem sintomas da síndrome, resultando também na maior atividade da peroxidase em ambos os tecidos (gemas e ramos), durante o período hibernal das plantas afetadas.
Peach Tree Short Life (PTSL) is a syndrome characterized by a collapse of the peach trees (Prunus persica (L.) Batsch) during the flowering, or in the beginning of the bud break period, after a drastic reduction of the temperature. The aim of the present work was to determine the peroxidase activity (UE min-1 g-1 MF) during the dormancy period in buds and twigs tissues of peach trees cv. Jubileu with and without PTSL symptoms. Two experiments were conducted separately, one for each appraised tissue, in two peach orchards with four years of implantation, both located in the colonial region of Pelotas, RS, in the Santa Helena and Cascata districts. The tissues consisted in buds and twigs collected in four dates during the dormancy period (June 11th, July 11th, July 29th, and August 05th) in 2003. The peroxidase activity determinations were carried out at the Vegetal Physiology Laboratory of Embrapa Clima Temperado. The plants with symptoms of PTSL showed higher peroxidase activity than the healthy plants along the dormancy period in both tissues analyzed. The syndrome triggering could lead to the dormancy interruption and the premature exposition of the new tissues to the injuries caused by the low temperatures during the winter. Moreover, the population levels of ring nematode (Mesocriconema xenoplax) and of the Helicotylenchus sp. found in the soil of plants with symptoms of PTSL were higher than plants without symptoms, resulting also in the higher peroxidase activity in both tissues (twigs and buds) during the rest period of the attached plants.
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Authors Anderson Carlos Marafon, Flávio Gilberto Herter, Marcos Antonio Bacarin, Fernando José Hawerroth
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Journal technocom
Year 2009
DOI
10.1590/S0100-29452009000400004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452009000400004
Keywords
oxidative stress dormancy

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