« Previous Abstract[Ambient VOCs Characteristics and Reactivity During O(3) Pollution in Autumn in Urban Beijing]    Next AbstractElevated CO2 influences nematode-induced defense responses of tomato genotypes differing in the JA pathway »

Plant Cell Environ

Title:		Elevated CO2 changes the interactions between nematode and tomato genotypes differing in the JA pathway
Author(s):		Sun Y; Cao H; Yin J; Kang LE; Ge F;
Address:		"State Key Laboratory of Integrated Management of Pest and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China"
Journal Title:		Plant Cell Environ
Year:		2010
Volume:		33
Issue:		5
Page Number:		729 - 739
DOI:		10.1111/j.1365-3040.2009.02098.x
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"Interactions between the root-knot nematode Meloidogyne incognita and three isogenic tomato (Lycopersicon esculentum) genotypes were examined when plants were grown under ambient (370 ppm) and elevated (750 ppm) CO2. We tested the hypothesis that, defence-recessive genotypes tend to allocate 'extra' carbon (relative to nitrogen) to growth under elevated CO2, whereas defence-dominated genotypes allocate extra carbon to defence, and thereby increases the defence against nematodes. For all three genotypes, elevated CO2 increased height, biomass, and root and leaf total non-structural carbohydrates (TNC):N ratio, and decreased amino acids and proteins in leaves. The activity of anti-oxidant enzymes (superoxide dismutase and catalase) was enhanced by nematode infection in defence-recessive genotypes. Furthermore, elevated CO2 and nematode infection did not qualitatively change the volatile organic compounds (VOC) emitted from plants. Elevated CO2 increased the VOC emission rate only for defence-dominated genotypes that were not infected with nematodes. Elevated CO2 increased the number of nematode-induced galls on defence-dominated genotypes but not on wild-types or defence-recessive genotypes roots. Our results suggest that CO2 enrichment may not only increase plant C : N ratio but can disrupt the allocation of plant resources between growth and defence in some genetically modified plants and thereby reduce their resistance to nematodes"
Keywords:		Animals Antioxidants/metabolism Biomass Carbon/metabolism Carbon Dioxide/*metabolism Cyclopentanes Genotype *Host-Parasite Interactions Solanum lycopersicum/*genetics/*parasitology Mutation Nitrogen/metabolism Oxylipins Plant Leaves/growth & development P;
Notes:		"MedlineSun, Yucheng Cao, Haifeng Yin, Jin Kang, L E Ge, Feng eng Research Support, Non-U.S. Gov't 2010/06/04 Plant Cell Environ. 2010 May; 33(5):729-39. doi: 10.1111/j.1365-3040.2009.02098.x"