Home
Print _CMN_EMAIL_ALT

Effects of arbuscular mycorrhizal fungal inoculations on the growth and polyphenol levels of garden leek (Allium porrum)

 

Malik S.A. Nasir1, Alberto Nuńez2, Lindsay C. McKeever1, Ocen M. Olanya3*

 

1USDA-ARS, Eastern Regional Research Center, Molecular Characterization of Foodborne Pathogens Research Unit, Wyndmoor, PA 19038, USA

2USDA-ARS, Eastern Regional Research Center, Core Technologies, Wyndmoor, PA 19038, USA

3USDA-ARS, Eastern Regional Research Center, Food Safety and Intervention Technologies Research Unit, Wyndmoor, PA 19038, USA

 

*Corresponding address:

This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

 

Received: October 6, 2017

Accepted: March 21, 2018

 

Abstract

Arbuscular mycorrizal (AM) fungi may enhance plant growth and polyphenol production, however, there have been limited studies on the relationships between root colonization of different fungal species and polyphenol production on cultivated Allium porrum (garden leek). The effects of inoculation of AM fungi spores from Rhizophagus intraradices, Giga -spora margarita, Glomus geosporum, Paraglomus occultum, Claroideoglomus claroideum, and Glomus species on colonization of garden leek roots and symbiotic changes in polyphenol production and plant growth were evaluated in greenhouse experiments. There were significant differences (p < 0.05) in colonization of leek roots by AM fungi species. The greatest level of root colonization was recorded on plants inoculated with R. intraradices (73%) and the lowest level on C. claroideum (3.2%). Significant differences (p < 0.05) in plant height were recorded between AM inoculated plants and the controls. Polyphenol levels differed significantly (p < 0.05) between garden leek plants inoculated with AM fungi and the non-inoculated controls. The percentage increases in polyphenol (a derivative of kaempferol) on garden leeks inoculated with G. geosporum relative to the untreated controls ranged from 28 to 1123%. Due to symbiosis with different AM species, other polyphenols decreased in some instances (negative values) and increased in others for values of up to 590%. Results showed that AM fungi species exhibited remarkable differences in polyphenol levels in garden leeks. The high polyphenol production by garden leek plants inoculated with G. geosporum, and Glomus species could be exploited for enhanced resistance of garden leeks to insects and diseases. This research highlights an understudied area, notably the relationships between AM fungal inoculations, root colonizations and polyphenol production in garden leeks. The findings can be utilized to improve pest resistance and the quality of garden leek plants.

 

Key words: Allium porrum, arbuscular mycorrhizal fungi, plant height, polyphenol levels,

root colonization, shoot and root weight

 

 
Editor in Chief
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Managing Editors
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Current issue cover
Who's Online
We have 1 guest online