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Asian Journal of Plant Sciences
  Year: 2009 | Volume: 8 | Issue: 5 | Page No.: 335-343
DOI: 10.3923/ajps.2009.335.343
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Relations among Growth, Nodulation, P Efficiency and Proton Efflux for Annual Legumes

K. Sungthongwises, R. Poss and J.J. Drevon

Although, cowpea is more tolerant to phosphorus deficiency than soybean and common bean, whether this better tolerance is related to a greater P Use Efficiency (PUE) or higher specific nodule activity is not well documented. In this study, we screened different annual legumes in the glasshouse for their genotypic diversity in PUE for Symbiotic Nitrogen Fixation (SNF) and their proton efflux from roots. After growing 4 weeks in hydro-aeropoonic conditions, the plants were transferred into serum bottles and on soil bags on a Chromic Cambisol soil from France or an Acid Sandy soil from Northeast Thailand until harvested. Almost all V. unguiculata cultivars nodulated on the Chromic Cambisol soil, but not on the Acid Sandy soil from Thailand. In this experiment, V. unguiculata showed mainly a better growth under P sub-deficiency (75 μmol P week-1) than P sufficiency (250 μmol P week-1) and a greater PUE rather than a higher specific nodule activity. V. unguiculata cv. 26-73 had the lowest proton efflux among all the cultivars. However, when V. unguiculata was grown on the Acid Sandy soil, we noticed a significant decrease in soil pH and the P applications tended to increase soil pH. According to the results from our trials, V. unguiculata is the most interesting grain legume to grow as it proved to be more tolerant to phosphorus deficiency. We especially recommend using cv. 26-73, since it was responsible for a smaller H+ efflux than the other cultivars.
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How to cite this article:

K. Sungthongwises, R. Poss and J.J. Drevon, 2009. Relations among Growth, Nodulation, P Efficiency and Proton Efflux for Annual Legumes. Asian Journal of Plant Sciences, 8: 335-343.

DOI: 10.3923/ajps.2009.335.343






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