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@plantcellphysiol.bsky.socialSep 8, 2026, 11:37 AM

How is leaf size regulated?🥬

Monden et al. reveal a novel mechanism by which an AHK3–CKX4 module governs root to shoot #xylem transport of trans-zeatin-type cytokinins, thereby fine-tuning leaf size according to root nitrate status

doi.org/10.1093/pcp/...

#PlantScience
#Phytohormones
#RootBiology

Proposed schematic model for xylem tZ-type CK transport controlled by AHK3 in response to nitrate signaling. Root-expressed AHK3 modulates the xylem tZ-type CK transport, thereby controlling the CK response and growth in leaves. Taken from Figure 8 of Kota Monden, Takamasa Suzuki, Mikiko Kojima, Yumiko Takebayashi, Takehiro Kamiya, Takatoshi Kiba, Hitoshi Sakakibara, Tsuyoshi Nakagawa, Takushi Hachiya, Cytokinin receptor AHK3 influences leaf size by modulating trans-zeatin-type cytokinin levels in xylem, Plant and Cell Physiology, Volume 67, Issue 7, July 2026, Pages 1237–1251, https://doi.org/10.1093/pcp/pcag052
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