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MYB94 and MYB96 additively inhibit callus formation via directly repressing LBD29 expression in Arabidopsis thaliana.

Plant Sci. 2020 Apr;293:110323. Epub 2019 Nov 06
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摘要


Plant somatic cells can be reprogrammed during in vitro culture. Callus induction is the initial step of a typical plant regeneration system. Recent studies showed that auxin-induced callus formation in multiple organs occurs from the pericycle or pericycle-like cells via a root developmental pathway. However, the molecular control of callus formation is largely unknown. Here, two MYB transcription factors, MYB94 and MYB96, were shown to play negative roles in auxin-induced callus formation in Arabidopsis. MYB94 and MYB96 were expressed in the newly formed callus. myb96, myb94, and myb94 myb96 generated more calli than the WT, with myb94 myb96 producing the most. MYB94 and MYB96 repressed expression of LATERAL ORGAN BOUNDARIES-DOMAIN 29 (LBD29) via directly binding to the gene's promoter. The loss of function of LBD29 partly rescued the callus formation defect of myb94 myb96. Our findings found MYB94 and MYB96 to be important repressors of callus formation and MYB94/96-LBD29 as a new regulatory pathway acting in parallel with ARF7/19-LBDs' pathway to modulate in vitro callus formation.

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