7/29/2019 Hyd Conference

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World Congress on Biotechnology21-23 March 2011

Hyderabad, India

Gene mining from phreatophyteProsopis juliflora for generation of

transgenic rice tolerant to abiotic stresses

Dr. Suja George

M.S. Swaminathan Research Foundation, Taramani Institutional area, India

Abstract

Abiotic stresses cause a drop in average yields for most crops. Development of crop plants able to grow

under stress conditions assumes importance in this context. Molecular dissection of stress adaptable

model plants is likely to throw light on novel pathways of tolerance. This study chose Prosopis juliflora, a

drought/heat/heavy metal tolerant tree ofFabaceae as the model plant for identifying and isolating genes

functioning in abiotic stress tolerance. A cDNA library was created from drought stressed leaf tissue ofP.

juliflora seedlings. Random sequencing of 1700 clones by EST analysis resulted in the identification of

several genes reported to function in tress tolerance in addition to many previously uncharacterized ones.

Once a suitable stress induced EST is identified, the gene is sequenced fully and characterized by

expression and biochemical analysis. A Reverse Northern experiment of 52 previously uncharacterized

genes under drought stress indicated up-regulation of many, implicating a possible function in drought

stress tolerance and paving way for better molecular insights into stress tolerance mechanisms of P.

juliflora. A GST gene from P. juliflora, upregulated under drought, salt, osmotic and oxidative stress was

transformed into the tobacco and the stress studies revealed protective function of this gene under

different abiotic stresses. This gene was transformed into Indica rice variety ADT-43 and the transgenicplants survived better under conditions of abiotic stress compared to control. The study is the first of its

kind in a leguminous tree species and adds to the existing knowledge on plant abiotic stress tolerance.

Biography

Dr. Suja George completed her PhD at the age of 28 from University of Madras on her thesis 'Genetic

engineering for abiotic stress tolerance using Prosopis juliflora (Swartz) DC. as a model plant system for

gene mining. she is currently working as a senior scientist at M.S. Swaminathan Research Foundation

(MSSRF), Chennai, India. She has 13 research publications including reviews, original research papers

and book chapters and an international patent. She is currently Principal investigator / CO principal

investigator in as many as six research proposals MSSRF has submitted to various funding agencies forfinancial support.