Prof. Rachel Amir

Prof. Rachel Amir
Principal Investigator
Professor
PhD
Plant Metabolism Laboratory
Phone
972-46953598
972-46944980
Research interests:

Plant molecular biology; sulfur metabolism; metabolism of amino acids; biology of pomegranates

The research deals with plant biotechnology with an emphasis on plant metabolism. We focus on two main subjects:

A. The metabolism of methionine in plants
Methionine is a nutritionally essential, sulfur-containing amino acid. Methionine levels in plants are low, therefore it often limits the plant’s nutritional value as a source of dietary protein for humans and animals. Methionine is also a fundamental metabolite in plant cells since, through its first metabolite, S-adenosyl-methionine (SAM), it controls the level of several key metabolites, such as ethylene, polyamines and biotin. These metabolites in turn, control many processes in plants. The group studies the factors that regulate methionine synthesis and catabolism in vegetative tissues and in seeds. In addition we study the role of cysteine, which is a substrate for methionine and glutathione synthesis that has a major role in protecting plants during stresses. The group also studies the regulatory role of the first committed enzyme of methionine biosynthesis, cystathionine gamma synthase, in methionine synthesis in plants and the effect of metabolites of the aspartate family on methionine synthesis and its accumulation.

B. Elucidation the bioactive compounds in pomegranate fruits and the factors that regulate their content
Pomegranate fruits and juice contain high levels of health benefiting compounds. Our group studies different aspects of pomegranate biology, focusing on the identification of the compounds that contribute to the pomegranate’s antioxidant and antifungal activities, as well as the ability of extracts prepared from different fruit parts to inhibit the proliferation of several cancer cell lines. In addition, we also study the effects of different growth conditions and the developmental stage of the fruit on the level of these compounds.

CV

Education
Ph.D. 1994, Faculty of Agriculture, Hebrew University of Jerusalem
M.Sc .1985, Department of Botany, Tel Aviv University

Academic and research experience
2008–2011 Head of the Department of Environmental Science, Tel Hai Academic College
2007 to present Associate Professor, Tel Hai College
2002–2006 Senior Lecturer, Tel Hai College
1996–2001 Lecturer, Tel Hai College
1996-Head of Plant metabolism Laboratory, Migal
1994–1996 Post-doctoral fellow in the laboratory of Prof. Gad Galili, Department of Plant Science, Weizmann Institute of Science

Scientific Publications

The level of threonine in tobacco seeds is limited by substrate availability, while the level of methionine is limited also by the activity of cystathionine ?-synthase

Matityahu I, Godo I, Hacham Y, Amir R.
Plant Science 2019 Volume 283 Pages 195-205
2019

Establishment of Punica granatum L. peel cell culture to produce bioactive compounds

Rubinovich L, Segev B, Habashi R, Con P, and Amir R.
Plant Cell, Tissue and Organ Culture 2019 Volume 138 Pages 131-140
2019

Gene expression and metabolite profiling analyses of developing pomegranate fruit peel reveal interactions between anthocyanin and punicalagin production.

Harel Beja R, Tian L, Freilich S, Habashi R, Borochov-Neori H, Lahav T, Trainin T, Doron-Faigenboim A, Ophir R, Bar-Ya?akov I, Amir R, Holland D.
Tree Genetics & Genomes 2019 Volume 15 Pages 22
2019

Primary metabolites, anthocyanins and hydrolizable tannins in the pomegranate fruit

Bar-Ya'akov I, Tian L, Amir R, Holland D.
Frontiers in Plant Science 2019 Volume 17 Pages 620
2019

Revisiting the attempts to fortify methionine contents in plant seeds. Journal of Experimental Botany.

Cohen H, Hacham Y, Amir R.
In Press 2019
2019