β-aminobutyric acid-mediated effects on root growth morphology
Date Issued
2010
Date
2010
Author(s)
Chen, Mao-Chuain
Abstract
Plants have developed numerous, complex defense mechanisms to escape infection by pathogens. The non-protein amino acid β-aminobutyric acid (BABA) is known as a plant resistance inducer against abiotic and biotic stresses. Its enhanced plant capacity to mobilize defense responses, this phenomenon is called “priming”. Priming has been notably studied in Arabidopsis thaliana against drought and salt stresses and various pathogens. However, little is known about the effects of BABA on plant development. To clarify this, we analyzed the mode of action of BABA on root development and observed that BABA inhibits primary root growth and increases lateral root density. Roots of higher plants, to adapt to their environment and gain maximum advantage for growth, change their growth direction in response to various environmental stimuli, such as gravity, light, moisture, nutrients, temperature and obstacles. To study BABA effects on root adaptation to their environment, we analyzed how BABA changes root response to environmental stimuli. BABA was found to alter the direction of root growth. In addition, this work shows for the first time that ibuprofen, a jasmonic acid inhibitor, also alters root growth direction.
Auxin and ethylene play an important role in primary root development; lateral root formation and root hair elongation. Our results suggest that BABA regulates root hairs development, but not lateral roots formation, through interactions with auxin and ethylene. Taken together, our data show that BABA does not only increase plant resistance to stress, but also affect plant development and plasticity.
Subjects
β-aminobutyric acid
root growth morphology
Type
thesis
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