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Corn plants with opposite leaves?
I thought I'd share a botanical oddity that falls into the category
of "things I probably wouldn't have believed without seeing for myself": Some researchers at a plant growth facility here have been growing a very large number of corn plants, both from seeds and also many plants derived from tissue culture. [The project is something to do with developing pest and/or herbicide resistant strains] Most are typical _Zea mays_ plants with a basically distichous alternate phyllotaxy throughout, but individuals with aberrant leaf arrangements also occur. When young, the aberrant ones seem at first glance to just have rosettes with more rows of leaves than the usual two, but closer inspection shows that they in fact consistently have a regular opposite-decussate phyllotaxy. Older plants are more obviously opposite- decussate, with opposite pairs of leaves alternating at right angles and with opposite pairs of axillary "ears". The sheathing bases of the pairs of leaves overlap one another [i.e, each is the 'outer leaf' on one of the two margins]. The mature stems are more or less square. The basal branches of the terminal male-flower "tassel" are similarly opposite-decussate in arrangement. I would estimate that between 1% and 3% of the hundreds of tissue- cultured plants show this very strange [for corn, and for any member of the grass family] phyllotaxis. They seem to be regularly produced in low numbers. Perhaps a closer study of the apical meristems and leaf primordia of young individuals could be published, at least to document the existence of this aberration. It may be of potential interest to any researchers into phyllotaxy, if such still exist. Does anyone know if this or similar oddities have been reported before? It seems likely to me that this isn't a new genetic trait, but is perhaps just an alternative expression of the normal phyllotactic-control mechanisms [whatever _they_ are] in a novel setting without some of the normal developmental constraints acting on an embryo forming in a seed. [Growing the seeds of these plants will help show whether it is heritable, but I don't think this has been done yet.] cheers |
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