Summary
Sieve elements with thick, lignified walls are identified in the longitudinal bundles of the wheat leaf and appear to be functional. They are also present in several festucoid grasses but appear to be absent from the panicoid grasses examined.
References
Esau, K.: The phloem. In: Handbuch der Pflanzenanatomie, vol. V, fasc. 2. Berlin-Stuttgart: Borntraeger 1969
Kuo, J., O'Brien, T.P., Zee, S.-Y. The transverse veins of the wheat leaf. Aust. J. biol. Sci. 25, 721–737 (1972)
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Kuo, J., O'Brien, T.P. Lignified sieve elements in the wheat leaf. Planta 117, 349–353 (1974). https://doi.org/10.1007/BF00388029
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DOI: https://doi.org/10.1007/BF00388029