AOBPreview published online on October 24, 2002
Annals of Botany, doi:10.1093/aob/mcf260
© 2002 by Annals of Botany Company
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GH-JENSEN, H.
Submitted on July 4, 2002
Affiliation of the authors:
1 Plant Nutrition and Soil Fertility Laboratory, Department of Agricultural Sciences, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark, ; Organic Farming Unit, Department of Agricultural Sciences, Royal Veterinary and Agricultural University, Højbakkegaard Allé 13, DK-2660 Taastrup, Denmark;
2 Plant Nutrition and Soil Fertility Laboratory, Department of Agricultural Sciences, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark;
3 INRA - Unite d'Agronomie, 234 Av. du Brezet, F-63039 Clermont-Ferrand Cedex 02, France
* To whom correspondence should be addressed. E-mail: hhj{at}kvl.dk.
The effects of P deficiency on growth, N2-fixation and photosynthesis in white clover (Trifolium repens L.) plants were investigated using three contrasting relative addition rates of P, or following abrupt withdrawal of the P supply. Responses to a constant below-optimum P supply rate consisted of a decline in N2-fixation per unit root weight and a small reduction in the efficiency with which electrons were allocated to the reduction of N2 in nodules. Abrupt removal of P arrested nodule growth and caused a substantial decline in nitrogenase activity per unit root weight, but not per unit nodule mass. Similarly, the rate of photosynthesis per unit leaf area was unaffected by abrupt P removal, whereas CO2 acquisition for the plant as a whole decreased due to a decline in total leaf area, leaf area per unit leaf weight and utilization of incoming radiation. These changes followed the decline in tissue P concentrations. The ratio between CO2-fixation and N2-fixation was maintained under short-term P deprivation but increased under long-term low P supply, indicating a regulatory inhibition of nodule activity following morphological and growth adjustments. It is concluded that N2-fixation did not limit the growth of clover plants experiencing P deficiency. A low P status induced changes in the relative growth of roots, nodules and shoots rather than changes in N and/or C uptake rates per unit mass or area of these organs.
Revised on July 26, 2002
Accepted on September 18, 2002
The Influence of Phosphorus Deficiency on Growth and Nitrogen Fixation of White Clover Plants
HENNING H
GH-JENSEN1*,
Key words: Fodder legumes, grassland, phosphorus, phosphorus deficiency, photosynthetic efficiency, N2-fixation, nitrogenase activity, relative addition rate, specific shoot area, Trifolium repens L., white clover.
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