The plant vasculature delivers phloem sap to the growth apices of sink organs, the meristems, via the interconnected sieve elements of the protophloem. In the A. thaliana root meristem, the stem cells form two files of protophloem sieve elements (PPSEs), whose timely differentiation requires a set of positive genetic regulators.
View Article and Find Full Text PDFSeedling vigor is a key agronomic trait that determines juvenile plant performance. Angiosperm seeds develop inside fruits and are connected to the mother plant through vascular tissues. Their formation requires plant-specific genes, such as BREVIS RADIX (BRX) in Arabidopsis thaliana roots.
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