A simple model based on known plant defence reactions is sufficient to explain most aspects of nodulation
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A simple model based on known plant defence reactions is sufficient to explain most aspects of nodulation. / Mellor, Robert B.; Collinge, David B.
In: Journal of Experimental Botany, Vol. 46, No. 1, 01.01.1995, p. 1-18.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A simple model based on known plant defence reactions is sufficient to explain most aspects of nodulation
AU - Mellor, Robert B.
AU - Collinge, David B.
PY - 1995/1/1
Y1 - 1995/1/1
N2 - We present the following hypothesis; that lipo-oligochitin Nod-factors can act in an elicitor-like fashion inducing, amongst other effects, a plant chitolytic enzyme, capable of hydrolysing the oligochitin chain of the Nod-factor. Decorative groups on the oligochitin chain, e.g. sulphate, may confer partial resistance to hydrolysis upon particular Nod-factors. After entry into the plant, Nod-factor synthesis must be down-regulated in order to avoid further, unwanted, eli-citation and the consequent abortion of the symbiosis. The plant-derived compounds inhibiting the synthesis of bacterial Nod-factors are limiting in root tissue, leading to residual elicitation and the abortion of infection thread formation. Nod-gene anti-induction is, furthermore, inactivated by both light and nitrate, thus contributing to the inhibition of nodulation under these conditions. In nitrogen-fixing nodules, the bacteroids are exposed to both nod-gene inducing and repressing compounds. The slow accumulation of Nod-factors within the peribacteroid space eventually results in the elicitation of phytoalexin synthesis and nodule senescence.
AB - We present the following hypothesis; that lipo-oligochitin Nod-factors can act in an elicitor-like fashion inducing, amongst other effects, a plant chitolytic enzyme, capable of hydrolysing the oligochitin chain of the Nod-factor. Decorative groups on the oligochitin chain, e.g. sulphate, may confer partial resistance to hydrolysis upon particular Nod-factors. After entry into the plant, Nod-factor synthesis must be down-regulated in order to avoid further, unwanted, eli-citation and the consequent abortion of the symbiosis. The plant-derived compounds inhibiting the synthesis of bacterial Nod-factors are limiting in root tissue, leading to residual elicitation and the abortion of infection thread formation. Nod-gene anti-induction is, furthermore, inactivated by both light and nitrate, thus contributing to the inhibition of nodulation under these conditions. In nitrogen-fixing nodules, the bacteroids are exposed to both nod-gene inducing and repressing compounds. The slow accumulation of Nod-factors within the peribacteroid space eventually results in the elicitation of phytoalexin synthesis and nodule senescence.
KW - Chitinase
KW - Elicitors
KW - Leguminosae
KW - Nod-factors
KW - Rhizobium
KW - Symbiosis.
UR - http://www.scopus.com/inward/record.url?scp=0029138916&partnerID=8YFLogxK
U2 - 10.1093/jxb/46.1.1
DO - 10.1093/jxb/46.1.1
M3 - Journal article
AN - SCOPUS:0029138916
VL - 46
SP - 1
EP - 18
JO - Journal of Experimental Botany. Flowering Newsletter
JF - Journal of Experimental Botany. Flowering Newsletter
SN - 1754-6613
IS - 1
ER -
ID: 201509059