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| Gutiérrez-Ibáñez,Ana T; Laguna-Cerda,Antonio; Rojas-Martínez,Reina; González-Garza,Ramiro; Salgado-Siclán,Martha L. |
| The Mexican potato (Solanum tuberosum L.) crop is affected by several diseases, including purple top (PPT). PPT is caused by phytoplasma and is transmitted by insects in the Cicadellidae family. In severe infections, this pathogen can cause yield losses of nearly 100%. The objective of this research was to identify and classify (at a molecular level) the causal agents of PPT. Potato plants were sampled in the state of Mexico (at Tenango del Valle, Zinacantepec, Atlacomulco and Donato Guerra) in the spring and summer of 2006. Approximately 40% of the plants tested positive for phytoplasma. The presence of plant DNA was determined by amplifying an endogenous gene with the 16s-1/16s-2 primers. To detect phytoplasma, the P1/P7 universal primers were used for... |
| Tipo: Journal article |
Palavras-chave: Phytoplasma; Potato diseases; Potato purple top. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200010 |
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| Mitchell,Paula L.. |
| The ability of piercing-sucking insects to transmit plant disease is closely linked to feeding mode and target tissue. The true bugs (Heteroptera) are generally considered to be of minimal importance as vectors of plant pathogens, although they share similar feeding behaviors with homopterans. Modes of feeding in Heteroptera include "lacerate-and-flush", intracellular penetration to vascular tissue, and an osmotic pump mechanism to acquire cell contents without penetrating the cell membrane. The relationship between heteropteran taxonomy, feeding mode, and the type of pathogens transmitted is explored through a literature survey of feeding behavior and vectoring capability. Transmission by true bugs of fungal pathogens, bacteria, viruses, phytoplasmas, and... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Insect vector; True bug; Transmission; Trypanosome; Phytoplasma. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000500001 |
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| Costa,Rodrigo Véras da; Silva,Dagma Dionísia da; Cota,Luciano Viana; Campos,Leonardo José Motta; Almeida,Rodrigo Estavam Munhoz de; Bernardes,Fernanda Pinheiro. |
| Abstract: The objective of this work was to evaluate the incidence of corn stunt disease and its effects on the grain yield of off-season corn (Zea mays) hybrids in different sowing seasons. The experiment was conducted in three sites in the state of Tocantins, in different sowing seasons, in a randomized complete block design, with 30 hybrids (treatments) and three replicates. Corn stunt disease incidence was assessed at 80 days after emergence, varying between hybrids and sowing seasons, with a marked effect of sowing season. The most resistant hybrids were: MG652 PW, Penta VIP, MG600 PW, NS90 PRO2, LG3040 VIP3, MG580 PW, and Defender VIP. The Fórmula VIP2 hybrid was the most susceptible to corn stunt disease. The incidence of the disease increased in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dalbulus maidis; Zea mays; Genetic resistance; Mollicutes; Phytoplasma; Spiroplasma. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102303 |
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| Hammond,Rosemarie Wahnbaeck; Bedendo,Ivan Paulo. |
| Maize rayado fino virus (MRFV), present in various countries in Latin America, has shown similarities to corn streak virus that occurs in Brazil, regarding pathogenic, serological and histological characteristics. In the current report both virus were molecularly compared to confirm the similarities between them. MRFV was identified by nucleic acid hybridization in samples of maize tissues exhibiting symptoms of "corn stunt" disease, collected from two Brazilian States - São Paulo and Minas Gerais. The coat protein gene and 3'non-translated region of MRFV were amplified from infected tissues by reverse transcription-polymerase chain reaction (RT-PCR) using MRFV-specific primers, and were characterized by nucleotide sequence and phylogenetic analysis of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: MRF virus; Corn viruses; Phytoplasma; Corn stunt. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600015 |
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