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Annals of Botany 39: 455-489, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Orthostichy, Parastichy and Plastochrone Ratio in a Central Theory of Phyllotaxis

R. L. THOMAS

Crops and Soils Department, Michigan State University U.S.A.1

1 Present address: Twyford Plant Breeders, Scotts Farm, King's Sutton, Banbury, Oxon OX17 3QW.

Received: 10 June 1974   

A view of phyllotaxis theory is proposed which combines the essentials of the orthostichy, parastichy and plastochrone ratio ideas. The advocated thesis takes cognisance of the biologically exact tangential divergence angles between nodes or primordia and this is in contrast with other major theories which have assumed the attainment of mathematically ‘ideal’ divergence angles. Rectiserial orthostichy lines are demonstrated to be present in both 'spiral' and ‘non-spiral’ systems. Basically similar mathematical laws govern the definition of such systems whether the phyllotaxis designation be Fibonacci, anomalous or multijugate. The inter-relationships of the various angular and other measures associated with plastochrone ratio, orthostichy lines and parastichy curves are dealt with in detail.


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