PJB-2010-180
L-TRYPTOPHAN APPLICATION ENHANCES THE EFFECTIVENESS OF RHIZOBIUM INOCULATION FOR IMPROVING GROWTH AND YIELD OF MUNGBEAN (VIGNA RADIATA (L.) WILCZEK)
ZAHIR A. ZAHIR*, H.M. YASIN, M. NAVEED, M.A. ANJUM AND M. KHALID
Abstract
Rhizobium inoculation has successfully been used for improving growth and yield of legume crops in different parts of the world. L-Tryptophan (L-TRP) application may further improve its effectiveness due to substrate-dependent inoculum-derived auxins in the rhizosphere. Rhizobium phaseoli strains were isolated using dilution plate technique from the mung bean nodules. Auxin biosynthesis by these rhizobial isolates was determined in the absence and presence of L-TRP, a physiological precursor of auxins. Rhizobial isolates varied widely in auxins biosynthesis capabilities and N42 being the highest auxin producer strain was further evaluated in the presence of different levels of L-TRP (10-3
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