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Annals of Botany 41: 771-777, 1977
© 1977 Annals of Botany Company

RESEARCH-ARTICLE

The Effects of Cotyledon Excision on Growth and Leaf Senescence in Soya-bean Plants

H. F. CHIN1, T. F. NEALES and J. H. WILSON

Schools of Agriculture and Botany, University of Melbourne Parkville 3052 Victoria, Australia

1Present address: University of Agriculture Malaysia, Serdang, Selangor, Malaysia.

Received: 6 August 1976   

One effect of the removal of cotyledons of soya-beans 24 h after imbibition was to reduce subsequent growth, especially in the first 10 weeks after planting. The longevity of treated plants was increased by 30 days and the onset of leaf senescence delayed, as judged by the time-course of leaf chlorophyll and soluble protein content, and also by the time-course of net photosynthesis and respiration rates. These effects are similar to those reported to result from partial defoliation of more mature plants.


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