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- W3084135418 abstract "ABSTRACT Leaves are asymmetric, with differential functionalization of abaxial and adaxial tissues. The bundle sheath (BS) surrounding the vasculature of the C3 crop barley is dorsoventrally differentiated into three domains: adaxial structural, lateral S-type, and abaxial L-type. S-type cells seem to transfer assimilates towards the phloem. Here we used single-cell RNA sequencing to investigate BS differentiation in C4 maize. Abaxial BS ( ab BS) cells of rank-2 intermediate veins specifically expressed three SWEET sucrose uniporters ( SWEET13a, b , and c ) and UmamiT amino acid efflux transporters. SWEET13a, b, c were also identified in the phloem parenchyma (PP). Thus maize acquired a unique mechanism for phloem loading in which ab BS cells provide the main pathway for apoplasmic sucrose transfer towards the phloem. This pathway predominates in veins responsible for phloem loading (rank-2 intermediate), while rank-1 intermediate and major veins export sucrose from the phloem parenchyma (PP) adjacent to the sieve element companion cell (SE/CC) complex, as in Arabidopsis. We surmise that ab BS identity is subject to dorsoventral patterning and has components of PP identity. These observations provide first insights into the unique transport-specific properties of ab BS cells and support for a modification to the canonical phloem loading pathway of maize, which may be generalizable to other C4 monocots." @default.
- W3084135418 created "2020-09-14" @default.
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- W3084135418 date "2020-09-08" @default.
- W3084135418 modified "2023-09-27" @default.
- W3084135418 title "Phloem loading via the abaxial bundle sheath cells in maize leaves" @default.
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- W3084135418 doi "https://doi.org/10.1101/2020.09.06.284943" @default.
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