Allelopathy of invasive weed Solanum elaeagnifolium Cav.: An investigation in germination, growth and soil properties
Mohamed Abdelaziz Balah 1, A-F  
,   Whaby Mohamed Hassany 2, A,C,F,   Abdelnaser Kopici 1, 2, A-B,E
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Plant Protection, Desert Research Center, Egypt
Plant Production, Desert Research Center, Egypt
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Mohamed Abdelaziz Balah   

Plant Protection, Desert Research Center, 1-Mathaf El Mataria st,, El-Mataria, 11753, Cairo, Egypt
Submission date: 2021-03-18
Acceptance date: 2021-08-13
Online publication date: 2021-09-24
Solanum elaeagnifolium Cav. is known to be one of the most invasive species worldwide. In this study, laboratory and greenhouse experiments were carried out to investigate the allelopathic properties of S. elaeagnifolium vegetative parts, root parts, fruit mucilage, and exudate extracts on plant communities and soil properties. In addition, the extract profiles of allelochemicals were quantified and their influence on soil properties and microorganisms was determined. Overall, the allelopathic performance of S. elaeagnifolium was established depending on the extract types, used concentrations, and target species. The dose-response activity indicated that vegetative parts extract showed the greatest allelopathic potential followed by root parts extract. Subsequently, mucilage extract had a moderate inhibitory potential, while root exudates showed the least activity. The same trend with slight response was detected in soil properties of pH and EC properties. Polyphenols, in the range of 5.70-0.211 mg/g and flavonols, in the range of 2.392-0.00 mg/g, were found in the analyzed samples extracted by ethyl acetate using LC-DAD-MS. The total phenol amount was 1.67 to 1.89 in the rhizosphere and 0.53 to 087 mg/g in non-rhizosphere soils. Solanum elaeagnifolium exhibited a greater significant suppression of fungi count in both high and low-density areas than in rhizosphere bacteria. In conclusion, the strong and broad-spectrum allelopathic potentials may enhance the ability of S. elaeagnifolium to impact seed germination and seedling growth of neighboring species. These biochemical weapons may play a critical role to facilitate their invasion and establishment in new agroecosystems.
The authors have declared that no conflict of interests exist.