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

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

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Abstract

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

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Subjects:	Mandate crops > Pigeonpea Others > Plant Pathology
Depositing User:	Mr T L Gautham
Date Deposited:	06 Mar 2014 09:01
Last Modified:	06 Mar 2014 09:01
URI:	http://oar.icrisat.org/id/eprint/7582
Official URL:	http://dx.doi.org/10.1016/S0885-5765(05)80136-5
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Google Scholar

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