Nitrogen root-induced

D. Robinson, B. Griffiths, K. Rilz, and R. Wheatley, Root-induced nitrogen mineralisation a theoretical analysis, PUini and Soil 7/7 185 (1989). 

H. Marschner and V. Romheld, In vivo measurement of root-induced pH changes at the. soil-root interface—effect of plant species and nitrogen. source, Zeitschrift fur Pfianzenphysiolgie 111 24 (1983). 

B. Griffiths and D. Robin.son, Root-induced nitrogen mineralisation a nitrogen balance model. Plant Soil 759 253 (1992). 

Soil-borne bacteria of the family Rhizobiaceae and leguminous plants form a symbiotic relationship during which a new organ, the root nodule, is developed. Within these root nodules the bacteria fix atmospheric dinitrogen and the product of nitrogen fixation, ammonia, is exported to the plant [69,70]. Root nodules develop from primordia which are established at specific sites in the root cortex shortly after Rhizobium infection. The peptide enod40 is believed to play a critical role in inducing the de-differentiation and the mitotic division of root cortical cells, i.e. the initial steps in nodule development. This however, is not entirely undisputed [3,4,69-72]. 

Roots R, Chatterjee A, Blakely E, Chang P, Smith K, Tobias C (1982) Radiation responses in air-, nitrous oxide-, and nitrogen-saturated mammalian cells. Radiat Res 92 245-254 Roots R, Chatterjee A, Chang P, Lommel L, Blakely EA (1985) Characterization on hydroxyl radical-induced damage after sparsely and densely ionizing irradiation. Int J Radiat Biol 47 157-166 Roti Roti JL, Cerutti PA (1974) Gamma-ray induced thymine damage in mammalian cells. Int J Radiat Biol 25 413-417... 

The formation of root nodules associated with nitrogen fixation in legumes is an area of active study. Hormonal involvement in the developmental modifications needed to establish the nodule, has been reviewed [186]. Studies on the molecular characterization of nodulation have shown that early nodulation genes are induced by auxin transport inhibitors, and inhibitor treated roots produce pseudonodules [187]. Rhizobium species appear to produce lAA by a pathway involving the conversion of tryptophan to indole-... 

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