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Oxygen transport and root respiration of maize zea mays seedlings a quantitative approach using the correlation between atp adp and the respiration rate controlled by oxygen tension



Oxygen transport and root respiration of maize zea mays seedlings a quantitative approach using the correlation between atp adp and the respiration rate controlled by oxygen tension



Plant Physiology (Rockville) 72(4): 1035-1039



O2 uptake and ATP/ADP ratio were simultaneously monitored during incubation of excised maize (Z. mays L. INRA 508) root tips under varying O2 parital pressure. Both variables were independent of O2 tension until a critical O2 pressure was reached. Below this pressure, ATP/ADP ratio and respiratory rate declined. In tissues having a high glycolytic capacity, the correlation between the ATP/ADP ratio and respiratory rate breaks down as O2 tension decreases, due to the increasing contribution of fermentative processses. In presence of 2 mM NaF, the ATP/ADP ratio varied solely as a function of the O2 tension, without interference by fermentative activity, and a close correlation links the ATP/ADP ratio and the respiratory rate of excised maize root tips over the whole range of O2 tensions tested. A method is proposed for the quantitative determination of the relative cellular respiratory rate permitted by O2 transport from the aerial part of young maize seedlings along the seminal root placed in an anoxic environment. Data demonstrate the preeminent part played by the cortical air spaces in O2 transport. Their contribution to respiration was high in the 1st few centimeters nearest the seed and decreased rapidly as the distance from the aerated source increased. O2 transport might contribute to the survival or to adaptive responses of root tissues in flooded soils but that the ventilation of the apical growing zone was inadequate to sustain the growth.

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