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Evolution of vascular tissue - Coggle Diagram
Evolution of vascular tissue
From non-vascular to vascular tissue
had major impact on the evolution of terrestrial biology
three essential functions
delivery of sources like water nutrients, amino acid and so on to various plant organs
mechanical support
communication within plant.
Hydroids
elongated water conducting hydroids are similar to tracheids
but lack lignin and secondary wall thickenings
Thin wall and lack the helices
Colllapse during water stress, making them highly resistance to cavitation.
Leptoids
very similar to pholem sieve cells
in some case they are nearly identical to protopholem cells of certain tracheophytes.
along with parenchyma cells, comprise the leptome.
distinct in verticle section by their elongate shape and slightly oblique end walls.
At maturity, nucleus degenerates as in pholem sieve cells but protoplasm remains.
mosses
lacks true vascular tissue
development of mosses already began with evolutionary precursors; Hydroids and leptoids
Hydroids often form a central strand in the gametophyte stem/sporophyte seta in the mosses.
leptoids are present in the form that are transitional between the parenchyma cells and the fully differentiated lephoid cells within the seta
Lycophytes
spike mosses/ quilworts
most are tropical
earliest group within the true vascular tissue has a dominant free living sporophytes stage.
Monilophyta
diverse group includes the whisk ferns, horsetails and ferns.
well developed vascular tissue
