Effect of Arnebia hispidissima and Echium rauwolfii ethanolic root extracts on growth, forage quality and two rhizospheric soil fungi of pigeonpea

GENERELLE ASPEKTE
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Abstract

The boraginaceous plants produce a number of valuable metabolites in their roots used in folk medicine. Some of these metabolites are colored and restricted to the epidermal root tissue. The functional attributes of these metabolites to the plant may be related to resistance against microbes. The effect of the root extracts of Arnebia hispidissima (Ar) and Echium rauwolfii (Ech) on growth and some metabolic traits of pigeonpea as well as their effect on two rhizospheric fungi was studied. The ethanolic root extract of both plants did not result in remarkable changes in the morphological characters of pigeonpea plants. The treatments decreased the fresh weight but increased the dry weight. The relative water contents of the leaves were increased upon treatments with Ech or Ar root extracts. The physiological parameters such as chlorophyll content, protein and carbohydrates were greatly affected by the roots extracts. Ech root extract has better increasing effect on these metabolites compared to Ar root extract. Both root extracts reduced variably the number of colonies of rhizospheric fungi Fusarium oxysporum and Thanatephorus cucumeris. They increased the fungal cell death within 12 h in vitro and caused increase in electrolyte leakage of the fungal cells suggesting that they have some compounds which targeting the cell membrane. The results indicated that the boraginaceous root extracts can improve the nutritional characteristics of pigeonpea as a fodder and may protect the plant against microbial pathogens.

Keywords

Boraginaceous plants Root extract Growth Metabolites Antifungal Forage quality 
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Notes

Acknowledgments

The author would like to thank Prof. Mohamed Sheded (Aswan Faculty of Science) for his help during plant material’s collection and identification. F. F. Abdel-Motaal is acknowledged for her assistance in isolation and identification of fungi. Thanks to Prof. S. Ito (Yamaguchi University, Japan) for providing the facilities for accomplishing part of this work.

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Copyright information

© Birkhäuser Verlag, Basel/Switzerland 2009

Authors and Affiliations

  1. 1.Botany Department, Aswan Faculty of ScienceSouth Valley UniversityAswanEgypt
  2. 2.Department of Biological and Environmental Sciences, Faculty of AgricultureYamaguchi UniversityYamaguchiJapan

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