[1] Bergersea, F.J. 1982.Root Nodules of Legumes.Structure and Functions. Research Studies Press, Toronto.[2] Dixoa. R.O., Blunders. E.A., and 5ear1. J.W.1981.Intercellular space and hydrogen , diffusion is peaand lupinrootnodules.PlantScience Letters. 23:109-116.[3] Dixon. R.O. and Wheeler. C.T. 1987.Nitrogen Fixation in Plants.Blackie, Glasgow and London, 61-86.[4] Duraad. J.L., Sheehy. J.E. and Minchia. F.R.1981.Nitrogenaseactivity, photosynthesis and nodule water potential is soybeanplants experi-eaciagwaterdeprivatioa. J.Exp.Bot., 38:311-321.[5] Huat. S., King. B.J. and Canvin. D. T.1987.Steady and nonsteady state gas exchange characteristics ofsoybeannodulesin relation to the oxygen diffusion barrier. Plant Physiol., 84:164-172.[6] Hunt. S., Gaito. S.T. and Layzell. D.B. 1988.Model of gas exchange anddiffusionislegume nodules.(I)Characterizationofthediffusion barrierandestimation of CO2, H2 and N2 is the 173:128-141.[7] the concentration of infectedcell.Plants, S.T, and Hunt. 5.1988 and the 117-127.[8] Lin. J., i gas exchange anddiffusionislegume (j)Calculation ofgasexchange rate:energy cost of Na fixation. Plants. 173"Canvin. D.T. sad Layzell. D.B. l988, Structural and physiological basesforeffectivity of soybean nodules formedbyfast-and slow-growing bacteria. Can. J. Bot., 66 :526-534.[9] Minchin. F.R, , Sheehy. J.E, sadWitty. J.F, 1985. Characterizationofthe resistance toOs diffusion is legume nodules. Ann. Bot, , 55:53-60.[10] vanNoordwij] c. M. and de Willigen, P, 1984, Mathematical models ondiffusiono foxygen to and within plant roots. with special emphasis on effects of soil-root contact, (I)Applicatioas.Plant and Soil. 77:215-241.[11] Ralston. E.J. and Ismande, 1, l9sz, Entry of oxygen and nitrogen into intact Soybean nodules, 1. Exp. Bot, , 33: 208-214, [12] Sheehy. 1.E., Bergersen. F.Rr and Witty. J.F.1987. A simulation study of gaseous diffusion resistaace, 'aodules pressure gradients and biological nitrogen fixation in soybean nodules. Ana. Bot, , 60: 345-351.[13] Sheehy. J.E., Minchia. F.R. andWitty, J.F.1983.Biological control of the resistance to oxygen flux in nodules. Ann. Bot., 52: 665-571.[14] Sinclair. T.R, and Goudriaan. J. 1981.Physical and morphological constraints on transport in nodules. Plant Physiol., 61:143-145.[15] Stewart, W.D. (ed.).1975. Nitrogen Fixation by Free-livingMicroorganisms.CambridgeUniv, Press. London. 3-28.[16] Torrey, J.G., Winship. L.J. (eds.).1989. Applicatioas of Continous and Steady-state Methods to Root Biology. Kluwer Academy Publisher, Dordrechi, 97-119.[17] Vessey. J.K., Walsh. K.B.and Layzell, D.B.1988. Oxygen limitation of Nxfixationinstem girdled and nitrated soybean. Physiol. Plant. 73:113-121.[18] Walsh. K.B., Vessey. J.K. and Layzell. D.B.1987.Carbohydrate supplyandNxfixation in soybean.The effect of varied daylenght and stem girdling. Plant Physiol.. 85:137-144.[19] Weisz. P.R. and Siaclair. T.R.1987. Regulation of soybean nitrogen fixation in response to rhizophere oxygen.(I)Role of nodulerespiration, (I)Quantificationofnodule gas permeability.Plant Physiol., 85:900-910. |