Journal
PLANT BIOTECHNOLOGY JOURNAL
Volume 16, Issue 3, Pages 808-817Publisher
WILEY
DOI: 10.1111/pbi.12830
Keywords
cambium activity; HD-ZIP III; interfascicular cambium; secondary growth; Populus
Funding
- National Nature Science Foundation of China [31630014, 31300500]
- Chinese Academy of Sciences [XDPB0402]
- Ministry of Science and Technology of China [2016YFD0600104]
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Wood production is dependent on the activity of the vascular cambium, which develops from the fascicular and interfascicular cambia. However, little is known about the mechanisms controlling how the vascular cambium is developed in woody species. Here, we show that PtrHB4, belonging to the Populus HD-ZIP III family, plays a critical role in the process of vascular cambium development. PtrHB4 was specifically expressed in shoot tip and stem vascular tissue at an early developmental stage. Repression of PtrHB4 caused defects in the development of the secondary vascular system due to failures in interfascicular cambium formation. By contrast, overexpression of PtrHB4 induced cambium activity and xylem differentiation during secondary vascular development. Transcriptional analysis of PtrHB4 repressed plants indicated that auxin response and cell proliferation were affected in the formation of the interfascicular cambium. Taken together, these results suggest that PtrHB4 is required for interfascicular cambium formation to develop the vascular cambium in woody species.
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