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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Soil nutritional status in KwaZulu-Natal drives symbiotic interactions and plant performance in Lessertia frutescens

N. G. Ngcobo A , A. O. Aremu A B , M. A. Pérez-Fernández C and A. Magadlela https://orcid.org/0000-0002-1381-2054 A *
+ Author Affiliations
- Author Affiliations

A School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal (Westville Campus), Private Bag X54001, Durban 4000, South Africa.

B Food Security and Safety Niche Area, Faculty of Natural and Agricultural Sciences, North West University, Private Bag X2046, Mmabatho, North West Province, South Africa.

C Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Carretera de Utrera Km 1, Seville 41013, Spain.

* Correspondence to: anathimagadlela@icloud.com

Handling Editor: Anthony O’Grady

Australian Journal of Botany 70(7) 499-508 https://doi.org/10.1071/BT21137
Submitted: 11 November 2021  Accepted: 26 October 2022   Published: 18 November 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Cancer bush (Lessertia frutescens L.) is a multipurpose medicinal legume endemic to southern Africa, reported to grow in a variety of soils, from very poor to fertile ones. However, there is limited knowledge on how L. frutescens is able to thrive in diverse soils and, particularly, nothing has been reported on the benefits from the microbe symbiosis, plant growth and acclimation to low nutrient soils.

Aims: Therefore, this study examined the effect of soil nutrient deficiency in plant–microbe symbiosis, nitrogen (N) nutrition and associated plant performance of L. frutescens plants, growing in four different impoverished soils from the KwaZulu-Natal region.

Methods: Experimental soil samples collected from four geographical distinct KwaZulu-Natal (KZN) locations (Hluhluwe, Izingolweni, Bergville and Ashburton) representing grasslands and savanna were used as natural inoculum and growth substrate.

Key results: Soil analysis showed significant differences in soil pH, exchange acidity, total cations, organic carbon (C), phosphorus (P) and N related to differences in the soil provenance. L. frutescens root nodules were dominated by Bacillus sp. in all soil treatments, except in plants grown in Bergville soil that did not nodulate. In all, 68–90% of total plant N concentration was reduced from atmospheric N. L. frutescens plants also relied on soil-available N for growth. Hluhluwe and Ashburton soil-grown plants showed a significantly higher biomass than did other soil-grown plants.

Conclusions: These current findings demonstrated that L. frutescens root nodules were dominated by bacteria characterised as phospho-bacteria and N2-fixing bacteria in these impoverished soils. This enabled L. frutescens to fix atmospheric N and assimilate soil available N to reduce energy demand.

Implications: These strategies may collectively contribute to L. frutescens resilience in nutrient-deficient savanna and grassland ecosystems.

Keywords: Bacillus, cancer bush, grassland and savanna soils, N source preference, N2 fixation, N2 fixing bacteria, phosphorus deficiency, plant-microorganism associations, phospho-bacteria.


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