Anisotomous dichotomy results from an unequal bifurcation of the original shoot apical meristem in Diphasiastrum digitatum (Lycopodiaceae)

American Journal of Botany
Xiaofeng Yin, Roger D Meicenheimer

Abstract

Two types of dichotomy are recognized in Lycopodiaceae: isotomous (equal) and anisotomous (unequal). Anisotomous dichotomy (anisotomy) has been hypothesized to result from unequal growth of an equal bifurcation of the original shoot apical meristem (SAM). Diphasiastrum digitatum (Lycopodiaceae) exhibits anisotomy at various locations. We thus used D. digitatum to test this classic hypothesis about anisotomy. Transverse areas of original and derived SAMs of anisotomy exhibited by the rhizome and the vertical aerial vegetative stem were measured using scanning electron microscopy. The difference between half of the original SAM and one derived SAM in terms of transverse area were compared using paired t-tests. During the anisotomy exhibited by the rhizome SAM, 77.4% of the transverse area of the original rhizome SAM contributed to the derived rhizome SAM. During the first anisotomy exhibited by the vertical aerial vegetative stem SAM, 66.2% of the transverse area of the original vertical aerial vegetative stem SAM contributed to the derived vertical aerial vegetative stem SAM. During the second anisotomy exhibited by the vertical aerial vegetative stem SAM, 49.4% of the transverse area of the original vertical aerial vegetative s...Continue Reading

References

Mar 24, 2011·Nature Reviews. Molecular Cell Biology·Malgorzata A Domagalska, Ottoline Leyser
Apr 12, 2011·PloS One·Hironori FujitaMasayoshi Kawaguchi
Apr 21, 2011·Annals of Botany·Dörte Müller, Ottoline Leyser
Jan 1, 2017·American Journal of Botany·Xiaofeng Yin, Roger D Meicenheimer

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Citations

Dec 20, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·C Jill Harrison, Jennifer L Morris
Jul 23, 2020·The New Phytologist·Rieko FujinamiToshihiro Yamada
Feb 8, 2021·Journal of Plant Research·Xiaofeng Yin

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