Progress has been made in research on the regulation of jasmonic acid in root tip stem cell maintena

As an important plant hormone, jasmonic acid regulates plant resistance to insect invasion, pathogen infection and mechanical injury, and also regulates many aspects of plant growth and development. In the early 1980s, jasmonic acid was recognized to inhibit plant growth, but the cytological and molecular mechanisms by which jasmonic acid achieves this physiological function are not clear.

The research team led by Li Chuanyou, a researcher at the institute of genetics and developmental biology, Chinese academy of sciences, found that the inhibition of jasmonic acid on the taproot growth of arabidopsis thaliana was reflected in the effects on cell division and cell elongation. Meanwhile, jasmonic acid changes the cytological structure of the microenvironment of root tip stem cells, including causing abnormal division of quiescent center (QC) cells and abnormal differentiation of root crown stem cells, and leading to decreased activity of root meristem. These cytological changes induced by jasmonic acid are similar to those induced by the auxin-pathway PLETHORA of stem cell transcription factor genes (PLT) mutations. Gel arrest, chromatin immunoprecipitation and other molecular biological experiments have shown that MYC2, an important transcription factor of the jasmonic acid signaling pathway, directly binds to and inhibits the expression of plt1/2 promoters.

Because auxin way by raising expression positive regulation of PLT root stem cells maintain and root meristem activity, and this study found that jasmonic acid by reduced PLT expression and negative regulation root stem cells maintain and root meristem activity, so the work reveals the jasmonic acid and auxin antagonism interactions regulating root stem cells maintain and taproot growth mechanisms. This work suggests that the coordination of growth and development process through the interaction of different hormone signals may be the general mechanism of response to environment formed by plants in the long-term evolution.

The results were published online in The Plant Cell on September 28. Chen qian, a doctoral candidate in Li Chuanyou's lab, and sun jianli, an associate researcher, are co-first authors of the paper. The research was funded by the ministry of science and technology and the national natural science foundation of China.
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