Photosynthetic and respiratory changes in leaves of poplar elicited by rust infection.

Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, Stn. Sainte-Foy, Quebec, QC, Canada.
Photosynthesis Research (Impact Factor: 3.15). 12/2009; 104(1):41-8. DOI: 10.1007/s11120-009-9507-2
Source: PubMed

ABSTRACT Poplars are challenged by a wide range of pathogens during their lifespan, and have an innate immunity system that activates defence responses to restrict pathogen growth. Large-scale expression studies of poplar-rust interactions have shown concerted transcriptional changes during defence responses, as in other plant pathosystems. Detailed analysis of expression profiles of metabolic pathways in these studies indicates that photosynthesis and respiration are also important components of the poplar response to rust infection. This is consistent with our current understanding of plant pathogen interactions as defence responses impose substantive demands for resources and energy that are met by reorganization of primary metabolism. This review applies the results of poplar transcriptome analyses to current research describing how plants divert energy from plant primary metabolism for resistance mechanisms.

1 Bookmark
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Plants are known to emit volatile organic compounds (VOC) in response to various biotic or abiotic stresses. Although the VOC emission in the case of insect attacks is well described, there is only little known about the impact of pathogens on plant emission. In the present study, we used a willow-leaf rust system to describe the effects of a biotrophic fungal infection on the VOC emission pattern of willow leaves. We detected that isoprene emissions from rust-infected leaves decreased threefold compared to control. The total monoterpene emissions did not change although a stress-signalling compound (Z)-beta-ocimene showed an increase in infected plants on several days. The infection also increased the emission of sesquiterpenes and lipoxygenase products (LOX) by factors of 175-fold and 10-fold, respectively. The volatile emission signals showed two clear peaks during the experiment. At 6, 7 and 12 days post-infection (dpi), the relative volatile emission signal increased to about sixfold compared to uninfected plants. These time points are directly connected to rust infection since at 6 dpi the first rust pustules appeared on the leaves and at 12 dpi necrosis had developed around several pustules. We present correlations between LOX and sesquiterpene emission signals, which suggest at least two different steps in eliciting the volatile emission.
    Planta 04/2010; 232(1):235-43. · 3.38 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Two practical universal source coding schemes based on approximate string matching are proposed. One is an approximate fixed-length string matching data compression, and the other is an LZ-type quasi parsing method by approximate string matching. It is shown that in the former algorithm the compression rate converges to the theoretical bound of R(D) for ergodic and stationary processes as the average string length tends to infinity. A similar result holds for the latter algorithm in the limit of the infinite database produced by the former algorithm. The main advantages of the proposed methods are the asymptotic behavior of the encoder implementation and the simplicity of the decoder. Practical results of image and voice compression will be presented
    Information Theory, 1995. Proceedings., 1995 IEEE International Symposium on; 10/1995
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Anthracnose represents an important disease of cowpea [Vigna unguiculata L. (Walp.)] caused by the hemibiothrophic fungus Colletotrichum gloeosporioides that drastically reduces cowpea field production. In this study we investigated some biochemical aspects underlying the incompatible interaction between a resistant cowpea genotype and C. gloeosporioides using a proteomic approach. Analyses of two-dimensional gel electrophoresis patterns and protein identification indicate C. gloeosporioides infection-dependent cowpea leaf proteome changes associated with metabolism, photosynthesis, response to stress, oxidative burst and scavenging, defense signaling, and pathogenesis-related proteins. Moreover the C. gloeosporioides responsive proteins interaction network in cowpea revealed the interconnected modulation of key cellular processes involving particularly antioxidants proteins, photosynthetic apparatus forming proteins and proteins of the energetic metabolism that interact with each other suggesting that their expression changes are also important for resistance of cowpea to C. gloeosporioides.
    Plant Science 01/2014; · 4.11 Impact Factor

Full-text (2 Sources)

Available from
May 29, 2014