Sink limitation induces the expression of multiple soybean vegetative lipoxygenase mRNAs while the endogenous jasmonic acid level remains low.

Bunker, Thomas W.; Koetje, David S.; Stephenson, Lowry C.; Creelman, Robert A.; Mullet, John E.; Grimes, Howard D.

doi:10.1105/tpc.7.8.1319

Cited by 73 publications

(27 citation statements)

References 69 publications

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“…We analyzed the expression of 1-aminocyclopropane-1-carboxylate synthase (acc), which is the key regulatory point in the biosynthesis of the signaling hormone ethylene, two genes related to the signaling hormone jasmonic acid (JA), lipoxygenase 7 (lox7) and 8 (lox8), and the gene encoding vegetative lipoxygenase 6 (lox6), which is not related to plant signaling and served as an internal control (22)(23)(24).…”

Section: Resultsmentioning

confidence: 99%

Anthropogenic increase in carbon dioxide compromises plant defense against invasive insects

Zavala

Casteel

DeLucia

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

198

163

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Elevated levels of atmospheric carbon dioxide (CO 2 ), a consequence of anthropogenic global change, can profoundly affect the interactions between crop plants and insect pests and may promote yet another form of global change: the rapid establishment of invasive species. Elevated CO 2 increased the susceptibility of soybean plants grown under field conditions to the invasive Japanese beetle ( Popillia japonica ) and to a variant of western corn rootworm ( Diabrotica virgifera virgifera ) resistant to crop rotation by down-regulating gene expression related to defense signaling [lipoxygenase 7 ( lox7 ), lipoxygenase 8 ( lox8 ), and 1-aminocyclopropane-1-carboxylate synthase ( acc-s )]. The down-regulation of these genes, in turn, reduced the production of cysteine proteinase inhibitors (CystPIs), which are specific deterrents to coleopteran herbivores. Beetle herbivory increased CystPI activity to a greater degree in plants grown under ambient than under elevated CO 2 . Gut cysteine proteinase activity was higher in beetles consuming foliage of soybeans grown under elevated CO 2 than in beetles consuming soybeans grown in ambient CO 2 , consistent with enhanced growth and development of these beetles on plants grown in elevated CO 2 . These findings suggest that predicted increases in soybean productivity under projected elevated CO 2 levels may be reduced by increased susceptibility to invasive crop pests.

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Section: Resultsmentioning

confidence: 99%

Anthropogenic increase in carbon dioxide compromises plant defense against invasive insects

Zavala

Casteel

DeLucia

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

198

163

View full text Add to dashboard Cite

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“…Recently, the enzymatic specificity of this soybean LOX isoform (LOX4, synonymous to VLXA, vegetative lipoxygenase, isozyme A; gene family member Lox1:Gm:4) has been determined to preferentially produce (13S)-hydroxy linoleic acid (Fuller et al, 2001). The soybean LOX gene family consists of at least eight members (Siedow, 1991;Bunker et al, 1995). Since those isozymes that share the same substrate specificity are also structurally related (Fuller et al, 2001), one could speculate that the LOX4 probe would have detected transcripts of other 13-specific LOXs in our Northern blotting experiments.…”

Section: Discussionmentioning

confidence: 99%

The Role of Octadecanoids and Functional Mimics in Soybean Defense Responses

Fliegmann

Schüler

Boland

et al. 2003

Biological Chemistry

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Oxylipins of the jasmonate pathway and synthetic functional analogs have been analyzed for their elicitor-like activities in an assay based on the induced accumulation of glyceollins, the phytoalexins of soybean (Glycine max L.), in cell suspension cultures of this plant. Jasmonic acid (JA) and its methyl ester showed weak phytoalexin-inducing activity when compared to an early jasmonate biosynthetic precursor, 12-oxo-phytodienoic acid (OPDA), as well as to the bacterial phytotoxin coronatine and certain 6-substituted indanoyl-L-isoleucine methyl esters, which all were highly active. Interestingly, different octadecanoids and indanoyl conjugates induced the accumulation of transcripts of various defense-related genes to different degrees, indicating distinct induction competencies. Therefore, these signaling compounds and mimics were further analyzed for their effects on signal transduction elements, such as the transient enhancement of the cytosolic Ca 2 + concentration and MAP kinase activation, which are known to be initiated by a soybean pathogen-derived ␤-glucan elicitor. In contrast to the ␤-glucan elicitor, none of the other compounds tested triggered these early signaling elements. Moreover, endogenous levels of OPDA and JA in soybean cells were shown to be unaffected after treatment with ␤-glucans. Thus, OPDA and JA, which are functionally mimicked by coronatine and a variety of 6-substituted derivatives of indanoyl-L-isoleucine methyl ester, represent highly efficient signaling compounds of a lipid-based pathway not deployed in the ␤-glucan elicitor-initiated signal transduction.

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“…Several plant proteins that are likely to reach the vacuole by a similar process have been identified. Prominent among these is a soybean lipoxygenase that accumulates in paraveinal mesophyll cell vacuoles as a vegetative storage protein [10,113], as well as certain late embryogenesis-abundant proteins [24,63].…”

Section: Transport Of Cytoplasmic Proteins Into the Vacuolementioning

confidence: 99%

Sorting of proteins to vacuoles in plant cells

Neuhaus

Rogers

1998

Protein Trafficking in Plant Cells

132

149

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An individual plant cell may contain at least two functionally and structurally distinct types of vacuoles: protein storage vacuoles and lytic vacuoles. Presumably a cell that stores proteins in vacuoles must maintain these separate compartments to prevent exposure of the storage proteins to an acidified environment with active hydrolytic enzymes where they would be degraded. Thus, the organization of the secretory pathway in plant cells, which includes the vacuoles, has a fascinating complexity not anticipated from the extensive genetic and biochemical studies of the secretory pathway in yeast. Plant cells must generate the membranes to form two separate types of tonoplast, maintain them as separate organelles, and direct soluble proteins from the secretory flow specifically to one or the other via separate vesicular pathways. Individual soluble and membrane proteins must be recognized and sorted into one or the other pathway by distinct, specific mechanisms. Here we review the emerging picture of how separate plant vacuoles are organized structurally and how proteins are recognized and sorted to each type.

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Sink limitation induces the expression of multiple soybean vegetative lipoxygenase mRNAs while the endogenous jasmonic acid level remains low.

Cited by 73 publications

References 69 publications

Anthropogenic increase in carbon dioxide compromises plant defense against invasive insects

Anthropogenic increase in carbon dioxide compromises plant defense against invasive insects

The Role of Octadecanoids and Functional Mimics in Soybean Defense Responses

Sorting of proteins to vacuoles in plant cells

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