INVESTIGADORES
ZAVALA Jorge Alberto
artículos
Título:
Biotic stress globally down-regulates photosynthesis genes
Autor/es:
BILGIN, DAMLA, D.; ZAVALA, JORGE A.; ZHU, J.; CLOUGH, STEVE T.; ORT DONALD R.; DELUCIA EVAN H.
Revista:
PLANT, CELL AND ENVIRONMENT (PRINT)
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2010 vol. 33 p. 1597 - 1613
ISSN:
0140-7791
Resumen:
To determine if damage to foliage by biotic agents, including
arthropods, fungi, bacteria and viral pathogens, universally
downregulates the expression of genes involved in
photosynthesis, we compared transcriptome data from
microarray experiments after twenty two different forms of
biotic damage on eight different plant species. Transcript
levels of photosynthesis light reaction, carbon reduction
cycle and pigment synthesis genes decreased regardless of
the type of biotic attack.The corresponding upregulation of
genes coding for the synthesis of jasmonic acid and those
involved in the responses to salicylic acid and ethylene
suggest that the downregulation of photosynthesis-related
genes was part of a defence response. Analysis of the subcellular
targeting of co-expressed gene clusters revealed
that the transcript levels of 84% of the genes that carry a
chloroplast targeting peptide sequence decreased. The
majority of these downregulated genes shared common
regulatory elements, such as G-box (CACGTG), T-box
(ACTTTG) and SORLIP (GCCAC) motifs. Strong convergence
in the response of transcription suggests that the
universal downregulation of photosynthesis-related gene
expression is an adaptive response to biotic attack. We
hypothesize that slow turnover of many photosynthetic proteins
allows plants to invest resources in immediate defence
needs without debilitating near term losses in photosynthetic
capacity.