Response of etiolated pea seedlings and cotton to ethylene produced from L-methionine by soil microorganisms
2008
Mahmood, M.H. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Khalid, A. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Khalid, M. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Arshad, M. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences)
The presence of a suitable substrate(s) in soil may release physiologically active concentration of a plant hormone ethylene (C2H4) as a result of microbial activity. We isolated three strains of fungi (Aspergillus clavatus, Penicillium commure and Thamridium elegans), from the maize rhizosphere soil, capable of producing C2H4 in the soil from L-methionine (10 mmol l-1). The plate and soil inoculation experiments conducted under controlled conditions revealed that the C2H4 released as a result of precursor (L-MET) inoculum (fungi) interaction caused a classical "triple" response in etiolated pea seedlings (a significant reduction in seedling length and increase in stem diameter). The classical "triple" response was also observed in the etiolated pea seedlings grown in non- sterilized soil amended with L-MET (no inoculation). The application of Ag(I), an inhibitor of C2H4 action, partially eliminated the classical "triple" response in etiolated pea seedlings.
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