β-Aminobutyric acid (BABA) is known as a nonprotein amino acid that can enhance the capacity of plants to resist various biotic and abiotic stresses. However, the role of BABA in protecting tobacco (Nicotiana tabacum L.) against potassium deficiency is not well understood. In this study, we demonstrated that the appropriate concentration of BABA promoted tobacco growth and enhanced plant tolerance to potassium deficiency. BABA protected tobacco from the reduction in the primary root length and chlorophyll content and increased K+ uptake via the regulation of expression of potassium up-taking-related NtHAK, NtLKS, NKT1, and NtKC genes. In addition, BABA affected the balancing between hydrogen peroxide level and peroxidase activity under low-potassium stress. Together, our results suggest that BABA plays a role in enhancing potassium deficiency stress tolerance by increasing K+ uptake, at least in part, via a ROS-dependent mechanism.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2012
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