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Geometric relation between the size of apical meristem and the lateral organ primordia size is not the only factor detemining floral phyllotaxis in Mongolia

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Wiss D., Zagorska-Marek B.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2009

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tom 51

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nr 2

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Geometric parameters of the apical meristem and the quality of phyllotactic patterns in Magnolia flowers

100%

Wiss D., Zagorska-Marek B.

Acta Societatis Botanicorum Poloniae

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2012

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tom 81

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nr 3

The ratio of primordium size to the meristem size (P/M ratio) is regarded by some geometrical models of phyllotaxis as the parameter, which determines the quality of spiral and whorled patterns of lateral organ arrangement. This assumption was tested on floral meristems in four genets representing four Magnolia taxa: M. × salicifolia, M. stellata, M. denudata and M. acuminata. In successive zones of Magnolia flower, lateral organs are initiated in specific phyllotactic patterns and at specific values of the meristem and primordia sizes. The elements of perianth, usually positioned in three trimerous whorls, are initiated as large primordia on relatively small meristem. The switch in the identity of primordia, from tepals to stamens is accompanied by an abrupt increase in the size of the meristem and decrease in the primordia size. Small values of P/M ratio and frequent occurrence of qualitative transformations of phyllotaxis contribute to the exceptionally rich spectrum of spiral patterns in androecium zone. New spiral patterns emerge when bigger primordia of carpels are initiated on the meristem, which at the same time starts diminishing in size either abruptly (M. × salicifolia, M. stellata, M. acuminata) or slowly (M. denudata). Spiral patterns identified in gynoecia have lower numbers of parastichies than the patterns of androecia and occur in frequencies specific for the genet. Although noted ranges of the meristem and primordia sizes, justify the occurrence of phyllotactic patterns observed in successive zones of Magnolia flower, they do not explain genet-specific frequencies of the patterns observed in gynoecium zone. The lack of straightforward relationship between frequency of the patterns and P/M ratio in gynoecium suggests that more complex geometrical factors or factors of non-geometrical nature are engaged in determination of Magnolia floral phyllotaxis.

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Fluctuations of PTU [phyllotactic triangular unit] geometry in phyllotactic lattices of Magnolia gynoecia

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Wiss D., Zagorska-Marek B.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

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How real is a computer-made phyllotactic lattice of magnolia's generative shoot?

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Wiss D., Zagorska-Marek B.

Biological Letters

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2005

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tom 42

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nr 2 Spec.Vol.

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica. Supplement

1 Acta Societatis Botanicorum Poloniae

1 Biological Letters

1 Polish Journal of Natural Sciences. Supplement

4 Wiss D.

4 Zagorska-Marek B.

1 2012

1 2009

1 2005

1 2003

Geometric relation between the size of apical meristem and the lateral organ primordia size is not the only factor detemining floral phyllotaxis in Mongolia

Geometric parameters of the apical meristem and the quality of phyllotactic patterns in Magnolia flowers

Fluctuations of PTU [phyllotactic triangular unit] geometry in phyllotactic lattices of Magnolia gynoecia

How real is a computer-made phyllotactic lattice of magnolia's generative shoot?