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Annals of Botany 39: 871-880, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Growth of the Stem of Agropyron repens (L.) Beauv

D. L. SMITH and P. G. ROGAN

Botany Department, The Queen's University Belfast, Northern Ireland

Received: 2 January 1975   

The growth rate of the stem of Agropyron repens (L.) Beauv. begins to decline when the sixth foliage leaf has expanded but the relative growth rate declines throughout the period between the production of one and ten mature leaves. On an absolute time scale there is a progressive decline in growth rate of successively formed stem (node-internode) units. On a plastochron scale the relative growth rate of successive stem units declines within the apical region but increases behind the apex. The decline in the apical region is related to a decrease in the rate of cell division and in the later formed stem units there is no significant increase in cell number from the time of their formation by the apex until the internode is initiated during their fourth plastochron. These changes are related to concurrent changes in the size of the shoot apex and in rates of leaf growth.


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