%0 Journal Article %1 Shaneetal_00 %A Shane, M. W. %A Mccully, M. E. %A Canny, M. J. %D 2000 %J Annals of Botany %K anatomy, bibtex-import, citeulikeExport grass %P 245--258 %T The vascular system of maize stems revisited: Implications for water transport and xylem safety %V 86 %X The plexus of vascular bundles in the nodes of grasses is notoriously complex, where long axial bundles pass through a network of transverse bundles. The xylem pathways for water in maize stems have been investigated anatomically and with dye and particulate tracers, revealing some of the details of this complexity. Only approx. 3 of axial vessels pass through nodes without being interrupted by end walls. Axial bundles at nodes di?er from those in internodes in having the metaxylem and protoxylem vessels connected by small tracheary elements. So it is only at nodes that exchange of sap occurs between the large vessels within a bundle. End walls, acting as lters for particles and gas bubbles, always separate axial vessels from vessels in transverse bundles. The high redundancy of bundle connections in the nodal plexus is interpreted as providing alternative water pathways to bypass embolisms and damaged or diseased sections of the xylem. The pores in the lters at the base of nodes and between axial and transverse vessels within nodes are 520 nm in diameter. Where axial vessels connect to transverse vessels, a variety of unusual shapes of vessel elements mediate two- and three-way connections within the plexus.

@article{Shaneetal_00, abstract = {{The plexus of vascular bundles in the nodes of grasses is notoriously complex, where long axial bundles pass through a network of transverse bundles. The xylem pathways for water in maize stems have been investigated anatomically and with dye and particulate tracers, revealing some of the details of this complexity. Only approx. 3 of axial vessels pass through nodes without being interrupted by end walls. Axial bundles at nodes di?er from those in internodes in having the metaxylem and protoxylem vessels connected by small tracheary elements. So it is only at nodes that exchange of sap occurs between the large vessels within a bundle. End walls, acting as lters for particles and gas bubbles, always separate axial vessels from vessels in transverse bundles. The high redundancy of bundle connections in the nodal plexus is interpreted as providing alternative water pathways to bypass embolisms and damaged or diseased sections of the xylem. The pores in the lters at the base of nodes and between axial and transverse vessels within nodes are 520 nm in diameter. Where axial vessels connect to transverse vessels, a variety of unusual shapes of vessel elements mediate two- and three-way connections within the plexus.}}, added-at = {2019-03-31T01:14:40.000+0100}, author = {Shane, M. W. and Mccully, M. E. and Canny, M. J.}, biburl = {https://www.bibsonomy.org/bibtex/25d822754ac2bd4e3c136cd5bb2aba9cc/dianella}, citeulike-article-id = {1524019}, comment = {(private-note)there are vessel ends with pit membranes, which act as filters found out the porosity of these by perfusing them with particles of different known sizes table with the different stains and what they stain for. there aren't just pits, but there are diaphragms at end walls Filters were located within two nodes between all vessels upward along the vessel pathway of axial bundles, laterally between the vessels within each axial bundle, between vessels in axial bundles and vessels in transverse bundles, and between the vessels in transverse bundles.}, interhash = {d4cbf441a55c09c7780a4601c42bb030}, intrahash = {5d822754ac2bd4e3c136cd5bb2aba9cc}, journal = {Annals of Botany}, keywords = {anatomy, bibtex-import, citeulikeExport grass}, pages = {245--258}, posted-at = {2007-07-31 07:03:58}, priority = {2}, timestamp = {2019-03-31T01:16:26.000+0100}, title = {{The vascular system of maize stems revisited: Implications for water transport and xylem safety}}, volume = 86, year = 2000 }