A proposed working model for BcWRKY33A-mediated root development in Bok choy. The transcription levels of BcWRKY25 and BcWRKY33A increased when exposed to NaCl stress. BcWRKY25 binds to the promoter of BcWRKY33A, enhancing its expression. As a result, the elevated BcWRKY33A directly activates the expression of BcLRP1 and BcCOW1, leading to the promotion of primary root elongation and root hair development.
News — Salt stress severely impacts plant growth, particularly in crops like Bok choy, which has a shallow root system. While genetic factors play a critical role in root architecture and stress responses, the molecular mechanisms underlying these processes remain poorly understood. WRKY transcription factors, such as BcWRKY33A, have been implicated in regulating root development and stress tolerance, but their exact roles in salt stress adaptation were unclear. Based on these challenges, further research is needed to fully elucidate the pathways involved in salt tolerance.
This, published in on September 28, 2024, unveils the role of BcWRKY33A in regulating root development under salt stress. Conducted by researchers from Nanjing Agricultural University and other institutions, this research focuses on how BcWRKY33A, in conjunction with other key genes, promotes root growth in response to salt stress, offering new insights for improving crop resilience.
The researchers discovered that BcWRKY33A, a transcription factor induced by salt stress, directly regulates the expression of BcLRP1 and BcCOW1, two genes critical for root development. BcLRP1 enhances primary root elongation, while BcCOW1 stabilizes root hair morphology. The study further identifies BcWRKY25 as an upstream regulator that triggers BcWRKY33A expression in response to salt stress. By manipulating these genetic pathways, the team successfully enhanced root growth and salt tolerance in transgenic plants. These results offer valuable strategies for breeding salt-tolerant crops, particularly in areas affected by salinity.
Dr. Xilin Hou, a leading researcher in the field, notes, "Our findings highlight the intricate genetic network that controls root development under stress. By understanding how BcWRKY33A regulates root architecture, we can develop more resilient crops, which is crucial in the face of increasing soil salinity challenges."
This research provides a comprehensive genetic framework for improving salt tolerance in crops like Bok choy. The insights into BcWRKY33A and its regulatory partners could aid in the development of genetically engineered plants with enhanced resilience to abiotic stresses. These findings hold significant promise for agricultural practices, especially in regions facing soil salinity, helping ensure food security in challenging environments.
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This work was supported by National Natural Science Foundation of China (32372698, 32072575), Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX22_0752), and National Vegetable Industry Technology System (CARS-23-A16) to T.L., and the USDA National Institute of Food and Agriculture (NIFA) Hatch project 02913 to W.L.
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is an open access journal of Nanjing Agricultural University and ranked number one in the Horticulture category of the Journal Citation Reports ™ from Clarivate, 2023. The journal is committed to publishing original research articles, reviews, perspectives, comments, correspondence articles and letters to the editor related to all major horticultural plants and disciplines, including biotechnology, breeding, cellular and molecular biology, evolution, genetics, inter-species interactions, physiology, and the origination and domestication of crops.
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