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Leaf curl syndrome of pigeonpea (Cajanus cajan (L.) Millsp.) is a systemic response to effective nodulation by the Rhizobium strain IC3342

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Relation http://oar.icrisat.org/7582/
http://dx.doi.org/10.1016/S0885-5765(05)80136-5
 
Title Leaf curl syndrome of pigeonpea (Cajanus cajan (L.) Millsp.) is a systemic response to effective nodulation by the Rhizobium strain IC3342
 
Creator Upadhyaya, N M
Rao, J V D K K
Dart, P J
Letham, D S
 
Subject Pigeonpea
Plant Pathology
 
Description Rhizobium str. IC3342 is an unusual bacterium that causes a leaf curl syndrome in pigeonpea. Growth characteristics, plasmid profile, conserved nif and nod gene sequences and nodulation host range of this strain resemble that of the fast-growing Rhizobium str. ANU240 (NGR234). Leaf curl occurred only in hosts effectively nodulated. A plasmid-cured, non-nodulating derivative failed to induce leaf curl symptoms. The str. IC3342 competed poorly with fast- and slow-growing root-nodule bacteria, but the observed nodule occupancy of 10% was enough to produce leaf curl symptoms. Suppression of nodule development by added inorganic nitrogen also prevented symptom expression. Approach grafting of a healthy pigonpea plant with leaf curl symptoms resulted in the development of leaf curl symptoms on the growing shoots of the healthy plant within 8 days of graft union. Further symptom expression ceased after graft separation. Feeding xylem sap from the leaf curled plant to a healthy plant induced the initial symptom of the syndrome, bending of the growing leaf tip. It is concluded that leaf curl induction is a systemic response for which effective nodulation is an apparent prerequisite
 
Publisher Elsevier
 
Date 1991
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/7582/1/Physiological%20and%20Molecular%20Plant%20Pathology_39_357-373_1991.pdf
Upadhyaya, N M and Rao, J V D K K and Dart, P J and Letham, D S (1991) Leaf curl syndrome of pigeonpea (Cajanus cajan (L.) Millsp.) is a systemic response to effective nodulation by the Rhizobium strain IC3342. Physiological and Molecular Plant Pathology, 38 (5). pp. 357-373. ISSN 0885-5765