Palestra

How phytoplasmas modulate plant architecture and promote their own spread in nature

Sala 2.3.13, FCUL, Lisboa

Por Saskia Hogenhout (John Innes Centre - Norwich, UK).

Abstract: Phytoplasmas are obligate intracellular bacterial parasites of plants that induce dramatic changes in plant architecture, including for instance, proliferation of stems and branches (witches’ brooms) and the reversion of flowers into leaf-like structures (phyllody). These bacterial parasites cause economic losses of a diverse range of crops worldwide and predominantly depend on sap-feeding insects for transmission to plants. The ubiquitous Aster Yellows Witches’ Broom phytoplasma (AY-WB) produces the three effectors SAP05, SAP11, SAP54 that promote the degradation of plant SPL, GATA, TCP and MADS-box transcription factors, leading to changes in shoot formation timing and numbers, plant aging, branching, and leaf and flower development. The insect vectors of AY-WB are polyphagous Macrosteles leafhopper species. Interestingly, the three AY-WB SAPs also convert plants into more attractive hosts for egg laying and reproduction of M. quadrilineatus. Thus, phytoplasmas produce specific effectors that interfere with key plant developmental processes leading to dramatic changes in plant architecture. Moreover, these effectors promote insect vector reproduction rates thereby increasing the number of insects that then can transmit the obligate phytoplasmas to new host plants.

11h00
cE3c - Centro de Ecologia, Evolução e Alterações Ambientais / CESAM-Ciências - Centro de Estudos do Ambiente e do Mar

Seminário de Tese no âmbito do Doutoramento em Biologia e Ecologia das Alterações Globais.

Colóquio de Matemática, por Carlos André (Departamento de Matemática | Ciências ULisboa e CEAFEL-Ciências - Centro de Análise Funcional, Estruturas Lineares e Aplicações).

Logótipo do evento, sobre um fundo branco

Understanding plant water relations at several scales under climate change is the theme of the XV Portuguese-Spanish Water relations Symposium: “Water relations under climate change: from genes to ecosystem”.

Seminário Helena Avelar de Astronomia e Astrologia Antiga, por Martin Gansten (Lund University e Umeå University).

Logótipos ERC e EIC

A sessão visa apresentar os programas ERC e EIC e as potenciais sinergias que podem ser estabelecidas entre ambos.

Fotografia de candidatos, acompanhada do título "M23 2022|2023"

A ULisboa promove o Dia Aberto M23, um evento que pretende aproximar o público adulto do meio universitário.

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Fotografia de placa de identificação de zona de plantação de vinha

Candidaturas até 28 de fevereiro de 2022.

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