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Droughts cause huge losses in crop production and endanger global food security
.
Due to their sessile growth characteristics, plants are unable to escape the stress they are subjected to, and are forced to evolve mechanisms to adapt to adversity
"Root-shoot ratio regulation" has always been a core scientific issue in the field of plant drought, but it has not been rationally explained in terms of molecular mechanisms for a long time
.
Why does drought inhibit the growth of above-ground parts of plants and promote the growth of plant roots? On December 23, 2021, Zhao Yang's research group from the Center for Excellence in Molecular Plant Science, Chinese Academy of Sciences published a research paper entitled "Phosphorylation of SWEET sucrose transporters regulates plant root: shoot ratio under drought" in the journal Nature Plants , revealing the molecular The regulatory mechanism of plant root-shoot ratio under drought stress
The researchers performed phenotypic analysis of ABA receptor 12 mutants and ABA signaling core protein kinase SnRK2 triple mutants and found that the regulation of plant root-shoot ratio under drought was dependent on ABA signaling
.
The growth of plant roots depends on the transport of photosynthetic products in the aerial part.
Sucrose is the main form of long-distance transport of plant photosynthetic products, and its long-distance transport depends on the "highway" of the phloem
.
Therefore, the activity of phloem sucrose transporter determines the carbon transport and carbon allocation capacity, thereby affecting plant growth and development, and determining crop yield and quality
In conclusion, this study elucidates the molecular mechanism by which drought signals promote carbon transport, and reveals the effect of carbon transport on carbon allocation and root growth, thereby elucidates the regulatory mechanism of plant root-shoot ratio under drought, and points out the simultaneous improvement of plant resistance.
and yield research direction
.
Expert Reviews:
In view of the importance of the work, Nature Plants published a review article titled "Drought meets SWEET" online at the same time, focusing on, evaluating and looking forward to the achievement
.
Prof.
Gong Zhizhong and Prof.
Yang Shuhua from the State Key Laboratory of Plant Physiology and Biochemistry, School of Biology, China Agricultural University commented on the academic significance of the above research results, pointing out that the article revealed the mechanism of ABA signaling mediating the transport of sucrose from shoots to roots, thereby Regulating root growth under drought stress provides a new strategy for plant drought resistance
.
The review article also pointed out that whether there is mutual regulation between ABA and TOR signaling pathways or other sugar signaling pathways in specific tissues under drought stress conditions, thereby promoting root growth needs to be further explored
Chen Qingchao, a doctoral student at the Center for Excellence and Innovation in Molecular Plant Science, Chinese Academy of Sciences, is the first author, and researcher Zhao Yang is the corresponding author
.
Dr.
Paper link: https:// align="center">
ABA signaling mediates the regulation of plant root-shoot ratio under drought
Transgenic plants mimicking phosphorylated SWEET promote root growth
A schematic model for the regulation of root growth by SnRK2 and SWEET under drought stress
