Journal of Food, Agriculture and Environment

Effect of herbicide on growth response and phosphorus uptake by host plant in symbiotic association with VA mycorrhiza (Glomus mosseae) 

Author(s):

Askif Pasaribu ¹, Rosli  Mohamad ¹*, Azizah Hashim ³, Zaharah A. Rahman ³, Dzolkhifli Omar ², Md. Mahbub Morshed ²*

Recieved Date: 2012-12-12, Accepted Date: 2013-04-24

Abstract:

The symbiotic vesicular-arbuscular mycorrhiza (VAM) fungi that colonize the roots of crop plants are an important group of soil-borne microorganisms for sustainable agriculture. Most of the research on VAM symbiosis has been focused on detrimental effects of fungicides on mycorrhizal performance, but possible interactions between herbicide and host plant performances in the symbiotic process associated with VAM on tropical soil conditions received less attention. The study aimed to evaluate the effects of three application rates of two widely used herbicides, alachlor (soil acting herbicide) and glyphosate (foliar acting herbicide) on Glomus mosseae (VAM fungus) on its symbiotic association with peanut plant. Alachlor (1.8, 3.6 and 5.4 µg a.i. g^-1 dry soil) and glyphosate (1.08, 2.16 and 3.24 µg a.i. g^-1 dry soil) were applied to mycorrhizal and nonmycorrhizal plants as soil drench. Peanut plant growth was significantly enhanced by the G. mosseae inoculation, but with the increasing application rates of alachlor the growth was significantly reduced at all levels, in contrast, the growth was unaffected by glyphosate treatments. The P concentration in shoot and P inflow into roots was significantly increased in mycorrhizal plants. Whereas, both P concentration and inflow were significantly decreased with the increasing rates of alachlor, but significantly increased with the application rates of glyphosate, with the highest value (0.333%, and 65.31 x 10^-13 mol P m^-1 s^-1  P concentration and inflow, respectively) obtained at recommended  glyphosate field rate (2.16 µg a.i. g^-1). The study suggests that although VAM fungi provides significant growth enhancement of peanut plant, the type of herbicides and their application rates are important factors in mediating the beneficial effects of G. mosseae symbiosis with peanut plant. 

Keywords:

Herbicide toxicity, mycorrhizal fungi, P inflow, P concentration, peanut plant, VAM symbiosis

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Agriculture
Pages: 352-357

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