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- W4280503852 abstract "Abstract Exploding seed pods evolved in the Arabidopsis relative, Cardamine hirsuta , via morphomechanical innovations that allow the storage and rapid release of elastic energy. Asymmetric lignin deposition within endocarp b cell walls is one such innovation that is required for explosive seed dispersal and evolved in association with the trait. However, the genetic control of this novel lignin pattern is unknown. Here, we identify three lignin-polymerizing laccases, LAC4, 11 and 17, that precisely co-localize with, and are redundantly required for, asymmetric lignification of endocarp b cells. By screening for C. hirsuta mutants with less lignified fruit valves, we found that loss of function of the transcription factor gene SQUAMOSA PROMOTER BINDING PROTEIN-LIKE 7 ( SPL7 ) caused a reduction in endocarp b cell wall lignification and a consequent reduction in seed dispersal range. SPL7 is a conserved regulator of copper homeostasis and is both necessary and sufficient for copper to accumulate in the fruit. Laccases are copper-requiring enzymes. We discovered that laccase activity in endocarp b cell walls depends on the SPL7 pathway to acclimate to copper deficiency and provide sufficient copper for lignin polymerization. Hence, SPL7 links mineral nutrition to efficient dispersal of the next generation." @default.
- W4280503852 created "2022-05-22" @default.
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- W4280503852 date "2022-04-21" @default.
- W4280503852 modified "2023-09-29" @default.
- W4280503852 title "Explosive seed dispersal depends on SPL7 to ensure sufficient copper for localized lignin deposition via laccases" @default.
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- W4280503852 doi "https://doi.org/10.1101/2022.04.21.488998" @default.
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