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- W3157617805 abstract "ABSTRACT The phloem transport network is a major evolutionary innovation that enabled plants to dominate terrestrial ecosystems. In the growth apices, the meristems, apical stem cells continuously produce early, so-called protophloem. This is easily observed in Arabidopsis root meristems, where the differentiation of individual protophloem sieve element precursors into interconnected, conducting sieve tubes is laid out in a spatio-temporal gradient. The mature protophloem eventually collapses as the neighboring metaphloem takes over its function further distal from the stem cell niche. Compared to protophloem, metaphloem ontogenesis is poorly characterized, primarily because its visualization is challenging. Here we describe an improved protocol to investigate metaphloem development in Arabidopsis root tips in combination with a set of new molecular markers. We found that mature metaphloem sieve elements are only observed in the late post-meristematic root although their specification is initiated as soon as protophloem sieve elements enucleate. Moreover, unlike protophloem sieve elements, metaphloem sieve elements only differentiate once they have fully elongated. Finally, our results suggest that metaphloem differentiation is not directly controlled by protophloem-derived cues but rather follows a distinct, robust developmental trajectory. Summary statement Metaphloem sieve element differentiation in Arabidopsis roots follows a robust developmental trajectory." @default.
- W3157617805 created "2021-05-10" @default.
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- W3157617805 date "2021-04-30" @default.
- W3157617805 modified "2023-10-14" @default.
- W3157617805 title "Metaphloem development in the Arabidopsis root tip" @default.
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- W3157617805 doi "https://doi.org/10.1101/2021.04.30.442082" @default.
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