Utility of Rhizobium in the phyllosphere of crop plants in nitrogen-free sand culture

Abstract

Soya bean, mung bean, Bengal gram and lentil grown in nitrogenless sand culture and sprayed with suspensions of different strains of Rhizobium showed increases in dry weight, chlorophyll and N-content. In a few cases the performance of Rhizobium applied to the phyllosphere was almost as good as a seed inoculation treatment. The beneficial effect of spraying Rhizobium strains was independent of the specificity of cross-inoculation groups. Nitrogenase activity as indicated by acetylene reduction by the Rhizobiitm-le&f association varied between 460 and 723 nniol/g leaf/h.

Utility of Rhizobium in the phyllosphere of crop plants under field conditions

“…As in the case of nitrogen-free sand culture experiments described in the previous paper (Nandi et al 1982) the field experiments showed that the growth attributes studied were improved with a considerable increase in yield. The increases observed are independent of the affiliation of the Rhizobium strain to any specific cross-inoculation groups or effectiveness for nodulation.…”

Further observations on the utility of N2-fixing micro-organisms in the phyllosphere of cereals

“…The improvement observed is equivalent to what is usually found with 40-60 kg N/ha. Sengupta et al (1982a), Sengupta & Sen (1982) obtained more impressive results with the Klebsiella strains KUPBR 2 and KUP 4 . Since we have used the same strains it appears that the efficiency of the strain may have decreased during maintenance in the laboratory in the intervening period.…”

“…chroococcum, Az. vinelandii OP and two N 2 -fixing phyllosphere iso-In a series of publications Sengupta & Sen (1976), i a t e s o f unknown identity were also included in Sengupta, Sen & Sen (1978), Sengupta et al (1981), t hi s study Sengupta, Nandi & Sen (1982a), Sen (1982) and Nandi, Sengupta & Sen (1983)…”

Espécie do hospedeiro, micro-habitat e época do ano modulam a estrutura das comunidades de micro-organismos diazotróficos na floresta Amazônica

“…Já foi demonstrado, em estudo de campo, que a FBN por rizóbios pode ser importante para as plantas, mesmo que ocorra de forma epifítica, em locais distantes da raíz (Nandi et al, 1982), e que algumas linhagens de Rhizobium poderiam fixar nitrogênio assimbioticamente (Oliveira-Longatti et al, 2013). No entanto, poucos estudos reportam essa capacidade de Rhizobia fixar nitrogênio assimbioticamente, e sua relevância em ecossistemas naturais.…”