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Mechanism of enhanced nodulation in vesicular-arbuscular mycorrhizal (Vam) pigeonpea (Cajanus cajan (L.) Mill sp.)
(Kerala Agricultural University, 1987) Sivaprasad, P; Rai, P V
Nodule and root initiation in Cajanus cajan plants inoculated with vesicular— arbuscular mycorrhizal fungus and Rhizobium was studied Mycorrhizal association enhanced the success of nodule formation with no significant difference in number of root initiated in a specific area. Further, there was increased cytokinin activity in stem exudate and root of mycorrhizal plants. Based on the observations a hypothesisis proposed for the mechanism of enhanced nodulation in mycorrhizal legumes.
Histochemical changes in nodules of Cajanus cajan (L.) Mill sp. inoculated with vesicular- Arbuscular Mycorrhizal Fungus and Rhizobium
(Kerala Agricultural University, 1988) Sivaprasad, P; Joshi, S S; Rai, P V
Symbiosis of Glomus fasciculatum (Thaxter sensu Gerd) and Trappe, Rhizobium and Ca/anus cajan (L.) Millsp. was studied in relation with bacteroidal zone and polysaccharide accumulation in nodule tissue. Tripartite symbiosis enhanced the area of bacteroidal zone in nodule tissue and size of bacteroidal cell and nucleus. Association of vesicular-arbuscular rnycorrhizal fungus alone had maximum polysaccharide accumulation in the nodule tissue. Dual inoculation with rnicrosymbionts showed very little polysaccharide accumulation