| Abstract Detail
Plant-Pest Interactions DeLucia, Evan [1], Bilgin, Damla [2], Zavala, Jorge [3], Zhu, Jin [4], Ort, Donald [5]. Biotic damage to leaves universally down-regulates the transcription of photosynthesis genes. In addition to producing a myriad of constitutive and induced defenses, a reduction in photosynthesis in remaining tissues may represent an indirect “cost” of herbivory and other forms of biotic damage. Using a comparative genomic approach we tested the hypothesis that biotic assault to leaf tissue causes a universal and balanced down-regulation of genes coding for photosynthetic proteins. Microarray data were obtained from public web sites or contributed by authors. The metadata included the transcription response to foliar damage inflicted by fungi, bacteria and virus, and by two insect feeding guilds, aphids and chewing insects. Fold-change data were subject to hierarchical clustering. With the exception of a putative chloroplast ferredoxin reductase, genes involved in light harvesting and photosynthetic electron transport were down-regulated in concert following damage. In carbon metabolism, the majority of the genes coding for aldolase, ketolase and isomerase reactions were up-regulated, while those coding for photosynthetic carbon reduction cycle proteins were down-regulated. The response to physical wounding, powdery mildew, and aphid was mild; viral, bacterial and other fungal infections and chewing damage by caterpillars caused a relatively strong reduction in the expression of photosynthetic genes. The universal nature of the response suggests that the coordinated down regulation of photosynthesis following biotic assault may be adaptive, perhaps by redirecting resources to defense or by altering the capacity for generation of reactive oxygen species.
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Related Links:
lead author's web page
host institute's web page
1 - Unversity of Illinois, Plant Biology and Institue of Genomic Biology, Urbana, IL, 61801, USA
2 - USDA ARS and University of Illinois, Institute of Genomic Biology
3 - Unversity of Illinois, Institute of Genomic Biology
4 - Unversity of Illinois, Crop Sciences
5 - USDA ARS and University of Illinois, Plant Biology and Institue of Genomic Biology
Keywords:
herbivory
pathogen
Photosynthesis
gene expression
microarray.
Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P14005
Abstract ID:288 |
