Related Experiment Video
Updated: Aug 7, 2026

A Flexible Low Cost Hydroponic System for Assessing Plant Responses to Small Molecules in Sterile Conditions
Published on: August 25, 2018
Rice GTPase OsRacB: potential accessory factor in plant salt-stress signaling
Min Luo1, Su-Hai Gu, Shu-Hui Zhao
1Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100080, China.
Abstract:
As the sole ubiquitous signal small guanosine triphosphate-binding protein in plants, Rop gene plays an important role in plant growth and development. In this study, we focus on the relationship between the novel rice Rop gene OsRacB and plant salt tolerance. Results show that OsRacB transcription is highly accumulated in roots after treatment with salinity, but only slightly accumulated in stems and leaves under the same treatment. Promoter analysis showed that OsRacB promoter is induced by salinity and exogenous salicylic acid, not abscisic acid. To elucidate its physiological function, we generated OsRacB sense and antisense transgenic tobacco and rice. Under proper salinity treatment, sense transgenic plants grew much better than the control. This suggests that overexpression of OsRacB in tobacco and rice can improve plant salt tolerance. But under the same treatment, no difference could be observed between OsRacB antisense plants and the control. The results indicated that OsRacB is only an accessory factor in plant salt tolerance.
Related Concept Videos
Responses to Salt Stress
Cell Signaling in Plants
Small GTPases - Ras and Rho
Three regulatory proteins control their activity:
Regulation of Transpiration by Stomata
Activation and Inactivation of G Proteins
GTPases and their Regulation
Large G-proteins, also known...

