Re-Evaluation of Vascular Histogenesis in the Root Tips of Selected Species in the Poaceae Using New Methods: Analysis of the Plerome, Vascular Initials, Pericycle and Late-Maturing Metaxylem Vessels
Yasushi Miki, Susumu Saito, Teruo Niki, Daniel K. Gladish
TL;DR
This study uses advanced imaging to analyze root vascular structures in grass species, revealing new insights into their development and cell organization.
Contribution
The paper introduces improved 3D imaging techniques to clarify vascular histogenesis in Poaceae root tips.
Findings
A quiescent plerome and distinct vascular initials were identified in root vascular cylinders.
A boundary point was found where vascular cell proliferation sharply declines.
VC diameter, late-maturing metaxylem vessels, and vascular cell numbers are closely related at the boundary point.
Abstract
Serial sectioning and 3D image reconstruction methods were applied to elucidate the structures of the apices of root vascular cylinders (VCs) in taxa of the Poaceae: Zea mays “Honey Bantam”, Z. mays ssp. mexicana, Hordeum vulgare and Oryza sativa. The primary and nodal roots were investigated. Observations were performed using high-quality sectioning and 3D image-processing techniques improved and developed by the authors. We found that a quiescent uniseriate plerome was located at the most distal part of each VC. Vascular initials were located immediately basipetally to the plerome as a specific uniseriate layer that could be classified into central and peripheral initials that produced all the cells in the VC. No supplying of cells from the plerome to the vascular initials was observed. Numerical analysis revealed a “boundary point” along the root axis where the rate of increase of…
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Taxonomy
TopicsPlant Molecular Biology Research · Plant responses to water stress · Plant nutrient uptake and metabolism