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Annals of Botany 52: 791-802, 1983
© 1983 Annals of Botany Company

RESEARCH-ARTICLE

Leaf Nodule Development in Psychotria kirkii Hiern. (Rubiaceae)

I. M. MILLER, A. SCOTT and I. C. GARDNER

Biology Division, Department of Bioscience and Biotechnology, University of Strathclyde George Street, Glasgow, G1 1XW

Accepted: 26 February 1983   

The initiation, development and structure of the leaf nodules of the Rubiaceous shrub Psychotria kirkii Hiern. has been studied in detail at the ultrastructural level. Bacteria, maintained in the shoot tip in the secretions from dendroid colleters, invade the substomatal chamber of stomatal pores which form precociously on the abaxial leaf surface. Proliferation of the epidermis around the pore pushes the bacterial cavity deep into the lamina, thus forming a small internal nodule. Endophyte-mediated schizogeny of the cells surroundng the nodule causes it to expand while at the same time giving rise to an interconnected reticulum of invasive host cells which are involved in metabolite exchange between microoganisms and host plant. Bacterial morphology changes after entry of the microsymbiont into the host plant and, by the time the nodule is mature, the bacteria exhibit distinct pleomorphism. Senescent nodules are shown to accumulate lipid and starch. The developmental process is discussed in the light of existing information on this symbiosis.

Psychotria kirkii, leaf nodule development, symbiosis, ultrastructure


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