Journal of Environmental Biology

Impacts of biotic and abiotic stress on major quality attributing metabolites of coffee beans

Sridevi? Vaddadi and Giridhar Parvatam*

Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore?570 020, India

*Corresponding Author E-mail: parvatamg@yahoo.com

Publication Data

Paper received:

27 November 2013

Revised received:

10 April 2014

Re-revised received:

06 June 2014

Accepted:

27 August 2014

Abstract

Biotic stress factors such as Rhizopus oligosporus and Aspergillus niger mycelial extracts and abiotic elements methyl jasmonate (MJ) and salicylic acid (SA), when administered through floral spray to Coffea canephora, showed significant influence on major bioactive metabolites of beans. Up to 42% caffeine, 39% theobromine and 46% trigonelline, along with 32% cafestol and kahweol content elevation was evident under respective elicitor treatments. Over all, the surge in respective metabolites depends on elicitor stress type and concentration. Abiotic factors MJ and SA were found to be efficient at 1 to 5 ?M concentration in augmenting all the metabolites, compared to R. oligosporus and A. niger spray at 0.5 -2.0 % wherein the response was moderate as compared to abiotic stress, however significant compared to control. Though this elevation in caffeine, theobromine, cafestol and kahweol is not warranted from quality point of view, increase in trigonelline improves coffee quality. Besides increase in metabolites, stress mediated augmentation of bioactive compounds in coffee has a wide scope for studying gene expression pattern.. ?? 

 Key words

Cafestol, Caffeine, Coffee, Kahweol, Nicotinic acid, Trigonelline 

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