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Journal of Experimental Botany, Vol. 53, No. 376, pp. 1929-1934, September 1, 2002
© 2002 Oxford University Press

The major Nod factor of Bradyrhizobium japonicum promotes early growth of soybean and corn

Received 10 July 2001; Accepted 10 May 2002

A. Souleimanov, B. Prithiviraj and D. L. Smith1

Department of Plant Science, Macdonald Campus, McGill University, 21,111 Lakeshore Road, Ste Anne de Bellevue, QC, Canada H9X 3V9

1 To whom correspondence should be addressed: Fax: +1 514 398 7897. E-mail: dsmith{at}macdonald.mcgill.ca

Greenhouse experiments were conducted to evaluate the effect of Nod factor Nod Bj-V (C18:1, MeFuc) of Badyrhizobium japonicum on the growth of soybean and corn. Three-day-old seedlings of soybean and corn were grown in hydroponic solutions containing four concentrations (0, 10–7, 10–9 or 10–11 M) of Nod factor. After 7 d of treatment, Nod factor enhanced soybean and corn biomass. Nod factor elicited profound effects on root growth resulting in 34–44% longer roots in soybean. More detailed analyses of the roots, using a scanner based image analysis system, revealed that Nod factor increased the total length, projected area and surface area of the roots and decreased the diameter of soybean roots, while it increased the total length of corn roots. Stem injection of soybean plants with 10–7 M Nod factor resulted in increased dry matter accumulation. These results suggest that Nod factor, besides mediating early stages of nodulation, has more general plant growth-promoting effects.

Key words: Key words: Corn, lipo-chito-oligosaccharide, Nod factor, nodulation, soybean.


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