African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6693

Full Length Research Paper

Variation of some growth, agronomical and biochemical parameters of Vigna unguiculata (L. Walp) under salinity stress

Nouok Alphonse Ervé
  • Nouok Alphonse Ervé
  • Department of Biological Sciences, Faculty of Sciences, The University of Bamenda, P. O. Box 39 Bambili, Cameroon.
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Mbouobda Hermann Desiré
  • Mbouobda Hermann Desiré
  • Department of Biology, Higher Teacher Training College, The University of Bamenda, P. O. Box 39 Bambili, Cameroon.
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Nzouakeu Mbuntcha Cynthia Linelle
  • Nzouakeu Mbuntcha Cynthia Linelle
  • Department of Biology, Higher Teacher Training College, The University of Bamenda, P. O. Box 39 Bambili, Cameroon.
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Choula Fridolin
  • Choula Fridolin
  • Department of Biology, Higher Teacher Training College, The University of Bamenda, P. O. Box 39 Bambili, Cameroon.
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Ndouma Mbondjo Cécile
  • Ndouma Mbondjo Cécile
  • Department of Botany, Faculty of Science, The University of Douala, P. O. Box 24157, Douala, Cameroon.
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Erica Wiraghan Shang
  • Erica Wiraghan Shang
  • Department of Biological Sciences, Faculty of Sciences, The University of Bamenda, P. O. Box 39 Bambili, Cameroon.
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Taffouo Victor Desiré
  • Taffouo Victor Desiré
  • Department of Botany, Faculty of Science, The University of Douala, P. O. Box 24157, Douala, Cameroon.
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  •  Received: 01 June 2022
  •  Accepted: 11 October 2022
  •  Published: 30 November 2022

Abstract

The variation of some growth, agronomical and biochemical parameters of Vigna unguiculata (L. Walp) under salinity stress were investigated in the greenhouse and farm conditions. Plants were subjected to 0, 50, 100 and 200 mM NaCl. The increases of NaCl in the culture medium significantly (P< 0.001) decreased the growth parameters (number of leaves, noose diameter, leaf area and stem height), dry biomass (roots, shoots and total), chlorophyll contents and micronutrients (Zn, Fe and Mn) from 100 mM NaCl. Macronutrients (K, Ca and Mg) and K/Na ratio significantly (P < 0.001) decreased in plant partitioning with increasing salinity. The metabolites (proline, total soluble carbohydrates, soluble proteins, total free amino acids, total phenolic and flavonoids contents) significantly (P < 0.001) increased from 50 mM NaCl in variety Ekomcalle compared to Mouala GG and could be considered as biochemical indicators of early selection and osmotic adjustment ability for salt tolerant plants. At 50 mM NaCl, a relative tolerance of variety Ekomcalle compared to Mouala GG for all agronomic parameters (the flowering time, number of flowers per plant, number of pods/plant, number of seeds/pod, pod yield, seed yield and harvest index) was observed suggesting that Ekomcalle could increase cowpeas production on salty soils.

Key words: Vigna unguiculata, salinity, growth, metabolites, mineral uptake, agronomic parameters.