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KMID : 0368420190620060410
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Journal of Plant Biology
2019 Volume.62 No. 6 p.410 ~ p.418
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Shoot Meristem Activity is Involved in Salt Tolerance on Arabidopsis Shoot Growth
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Jun Ye-Sol
Cha Ok-Kyoung
Kim Jeong-Hyun
Lee Ho-Rim
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Abstract
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All aerial tissues and organs of higher plants are generated from the shoot apical meristem (SAM) containing a pluripotent stem cell population. The maintenance of shoot meristem activity, such as cell proliferation and differentiation, is important for appropriate normal growth as well as adaptive plastic development under abiotic stress conditions. Here we report that the effects of salt tolerance on Arabidopsis shoot growth may occur via shoot meristem activity. Interestingly, the clv3-2 and clv1 bam1 mutants showed the salt tolerant phenotype on shoot growth and development through the increased number of actively dividing cells in the SAM but not the promoted expression levels of the typical stress-responsive genes. The reduction of 5-ethynyl-2′-deoxyuridine (EdU)-labeled dividing cells in the SAM by the treatment of abiotic stresses occurred most likely through abscisic acid (ABA) and reactive oxygen species (ROS). In addition, shoot meristem activity via cell proliferation was regulated dynamically depending on the presence or absence of abiotic stimuli. Therefore, these results suggest that stem cell maintenance and differentiation in the SAM may play an important role in stress tolerance for developmental plasticity on plant growth against unfavorable environmental conditions.
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KEYWORD
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Abiotic stress, Cell proliferation, Salt tolerance, Shoot meristem activity
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