李树抗叶烫基因型的选择

Summa Phytopathologica Pub Date : 2020-12-01 DOI:10.1590/0100-5405/238868

Gislaine Gabardo, Clandio Medeiros da Silva, H. D. Silva, Iohann Metzger Iauchrowitz, Flávio Corrêa Carvalho, R. P. Leite Júnior

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引用次数: 4

摘要

摘要：巴西的李（Prunus salicina Lindl.）栽培因叶烫伤而受到严重影响，叶烫伤是一种由木霉菌（Xylella fastdiosa subsp.）引起的疾病。多路复用本研究的目的是评估在自然条件下，具有抗叶烫伤的农业前景的李基因型。从属于“巴拉那农业研究所（IAPAR）”种质库的50个李基因型中选出10个。2017年和2018年1月至2月，对叶片烫伤严重程度进行了5次评估。还对这些基因型的样品进行聚合酶链式反应（PCR）以确定细菌X。多路复用不同基因型对叶烫伤的易感性不同。PR-1095是最具抗性的基因型，并且没有表现出任何该病的叶片症状。相反，基因型PR-1126和PR-1137对该疾病的易感性最大，表现出严重的烫伤症状。然而，PCR显示，即使在最具抗性的基因型中也存在这种细菌，这表明，例如，没有疾病症状的PR-1095可能对叶烫伤具有耐受性。

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Selection of plum genotypes for resistance to leaf scald

ABSTRACT Plum (Prunus salicina Lindl.) cultivation is seriously compromised in Brazil due to the occurrence of leaf scald, a disease caused by the bacterium Xylella fastidiosa subsp. multiplex. The objective of this study was to evaluate plum genotypes agronomically promising for resistance to leaf scald, under natural conditions of occurrence of the disease. Ten out of 50 plum genotypes belonging to the germplasm bank of “Instituto Agronômico do Paraná (IAPAR)” were selected. Five evaluations of leaf scald severity were carried out from January to February (2017 and 2018). Polymerase chain reaction (PCR) was also performed for samples of these genotypes to determine the presence of the bacterium X. fastidiosa subsp. multiplex. The genotypes differed in relation to their susceptibility to leaf scald. PR-1095 was the most resistant genotype and did not show any leaf symptom of the disease. In contrast, genotypes PR-1126 and PR-1137 had the greatest susceptibility to the disease, showing severe scald symptoms. However, PCR revealed the presence of the bacterium even in the most resistant genotypes, indicating, for example, that PR-1095, which had no symptoms of the disease, is probably tolerant to leaf scald.

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来源期刊

Summa Phytopathologica Agricultural and Biological Sciences-Plant Science

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： The Summa Phytopathologica is a publication of the São Paulo State Plant Pathology Association (APF), Botucatu SP. Summa Phytopathologica (SP) is dedicated to publishing technical and scientific articles that describe original research in the area of Plant Pathology that may contribute significantly to its progress. SP accepts papers written in Portuguese, English, or Spanish. Its abbreviated title, Summa Phytopathol., should be used in bibliographies, footnotes and bibliographical references and strips.