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Annals of Botany 76: 177-189, 1995
© 1995 Annals of Botany Company

Pith Autolysis in Herbaceous Dicotyledonous Plants. A Physiological Ecological Study of Pith Autolysis under Native Conditions with Special Attention to the Wild Plant Impatiens capensis Meerb.

Susan M. Carr, Mark Seifert, Ben Delbaere and Mordecai J. Jaffe

Biology Department, Wake Forest University, Winston-Salem, North Carolina 27109, USA

Pith autolysis, in the past studied only in herbaceous cultivated dicotyledonous plants, commonly occurs in wild plants. A survey of pith autolysis in wild plants was conducted in several different biomes in both North Carolina, USA and in Belgium. An objective method and a subjective method were developed and used to estimate the amount of pith autolysis in the internodes of bean (Phaseolus vulgaris L.) and the wild plant jewelweed (Impatiens capensis Meerb.) under experimental conditions. A ranking system also was used to quantify pith autolysis in other wild plants. In the field, a positive correlation was found between the rate of internode elongation and pith autolysis.

Injections of sucrose solution were found to reduce the amount of pith autolysis developed in the upper internodes of jewelweed when compared to injections of control solution. Extracts from the nodal tissues of jewelweed increased the amount of pith autolysis developed by both jewelweed in the field and bean in the greenhouse. This increase in pith autolysis may be due to a principle present in the jewelweed nodes that signals or causes the supertending internodes to become hollow.Copyright 1995, 1999 Academic Press

Pith, autolysis, Phaseolus vulgaris L., Impatiens capensis Meerb., sucrose, internode, hollow stem


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