Abstract
In vitro organogenesis is well-controlled and thus provides an ideal system to study mechanisms of plant organ development. Although it has been well investigated for a long time that exogenous hormones play important roles in determining the types of organs regenerated in vitro, there is currently limited information available for other key factors that mediate de novo organ regeneration. Here, we reported simple and efficient one-step processes for evaluating capacities of inflorescence stem-derived in vitro organogenesis between two different ecotypes in Arabidopsis. Different types of organs, including shoots and roots were initiated from inflorescence stem explants cultured on the media containing 216 combinations of exogenous auxin and cytokinin. Further, we showed that Wassilewskija ecotype had the much higher shoot regeneration capacity than Columbia with different combinations of hormones, indicating that the ecotype is an essential factor determining de novo organogenesis. Our results also suggested that the defined expression patterns of genes involved in auxin and cytokinin biosynthesis were correlated with the variations in organogenesis capacities between the two ecotypes. Thus, in vitro organogenesis is likely regulated by ecotypes through mediating endogenous hormonal biosynthesis.
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Acknowledgments
This research is supported by grants from the National Natural Science Foundation of China (90917015, 31000652) and the Ministry of Science and Technology (MOST) of China (2007CB948200).
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Xiang Yu Zhao and Ying Hua Su contributed equally to this work.
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Zhao, X.Y., Su, Y.H., Zhang, C.L. et al. Differences in capacities of in vitro organ regeneration between two Arabidopsis ecotypes Wassilewskija and Columbia. Plant Cell Tiss Organ Cult 112, 65–74 (2013). https://doi.org/10.1007/s11240-012-0216-8
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DOI: https://doi.org/10.1007/s11240-012-0216-8