Abstract
Species of the genera Polhillia, Wiborgia and Wiborgiella are endemic to the Cape fynbos, South Africa. These plants form root nodules with soil rhizobia that fix atmospheric nitrogen. Little is known about their N and P nutrition, as well as their water-use efficiency in this highly dry and nutrient-poor soil environment. Therefore, the aim of this study was to assess P nutrition and water-use efficiency in natural stands of Polhillia, Wiborgia and Wiborgiella species as well as their dependency on Biological N2 fixation for nutrition. The δ15N natural abundance technique was used to measure the symbiotic performance. The Acid and alkaline phosphatase activities were assayed using p-nitrophenol method. 16S rRNA sequence was used to identify microsymbionts nodulating the test plants. The δ15N study showed a high dependency of the tested species on N2 fixation. The N derived from fixation was 76–84% for Polhillia sps., 73–91% for Wiborgia sps., and 61–68% for Wiborgiella sessilifolia. The species differed in water-use efficiency, with δ13C values of −28.1 to −25.1‰ for Polhillia sps., −28.3 to −25.8 ‰ for Wiborgia sps., and − 27.7 to −27.1‰ for Wiborgiella sessilifolia. The rhizosphere acid and alkaline phosphatase activities were higher in P. brevicalyx and P. pollens, than in the other tested species and this resulted in greater available P in the rhizosphere soils and an increased P uptake and accumulation in the plant shoots. Based on 16S rRNA nucleotide sequence and phylogenetic analysis of root nodule isolates, a diverse and novel Mesorhizobium sps. nodulate the tested plant species in the fynbos ecosystem.
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We are grateful to the South African Research Chair in Agrochemurgy and Plant Symbioses, the National Research Foundation, and the Tshwane University of Technology for financial support to FDD’s research, and for a SARCHI Chair Master’s bursary to TM.
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Mpai, T., Jaiswal, S.K. & Dakora, F.D. Accumulation of phosphorus and carbon and the dependency on biological N2 fixation for nitrogen nutrition in Polhillia, Wiborgia and Wiborgiella species growing in natural stands in cape fynbos, South Africa. Symbiosis 81, 65–78 (2020). https://doi.org/10.1007/s13199-020-00683-y
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DOI: https://doi.org/10.1007/s13199-020-00683-y