Biosynthesis‐Based Spatial Metabolome of Condensed Tannin Reveals Its Role in Salt Tolerance of Non‐Salt‐Secretor Mangrove Kandelia obovata

An autofluorescent inclusion (AFI) specifically accumulated in mesophyll cells (MCs) of non-salt-secretor mangrove was found to be related to salt, but its biosynthesis and spatial distribution characteristics remain unclear. Here, Kandelia obovata served as the experimental material, and the composition of AFI was identified as condensed tannin (CT). Na contents increased in purified AFIs under NaCl treatment, while Na