College of Education and Human Development wordmark.

McNair Scholar 2014Redeat A. Tibebu

Redeat A. Tibebu is a senior at the University of Minnesota, Twin Cities, majoring in horticulture with an emphasis in plant biotechnology. Her research interests revolve around understanding biotic and abiotic stress in plants. Ms. Tibebu plans on getting a Ph.D. in Applied Plant Sciences.

Redeat A. Tibebu photo
My dream is to earn a Ph.D. and eventually work in agricultural development in developing countries. I want to contribute to the fight toward eliminating poverty through advancement in agriculture.

Research project

The Role of Reactive Oxygen Species following Ultraviolet-B Irradiation

Abstract: Ultraviolet (UV) radiation is a constituent of sunlight that influences plant morphology and growth. Ultraviolet-B (UV-B) is specifically UV light in the wavelength range of 280 nm – 320 nm. Abundance of UV-B on the earth’s surface has been increasing with the depletion of the ozone layer. This increase is expected to affect biomass accumulation and agricultural productivity. Previous studies have shown that UV-B induces photomorphogenic responses and causes damage to biomolecules such as DNA, RNA, and protein. However, the pathway involved in the photomorphogenic response to UV-B has been understudied. This research aims to study the role of reactive oxygen species (ROS), toxic byproducts of cellular respiration, that play important signaling roles in plants exposed to stress. This study investigated the role ROS play in Arabidopsis thaliana treated with UV-B light. The results obtained suggest that ROS may play a signaling role in plants exposed to UV-B light. Download poster. [PDF]

Faculty profile

Dr. Gary Gardner is a professor in the Department of Horticultural Science at the University of Minnesota. Dr. Gardner received his A.B from Oberlin College and his A.M and Ph.D. from Harvard University, all in Biology. His research specializes in the fields of plant photobiology and plant development and is currently focused on the effect of ultraviolet-B irradiation on plant growth and development. Dr. Gardner has published in multiple research journals and has presented his work at conferences nationwide.