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Intra-Plant Relationships in Reed Canarygrass¹

Vegetative shoots of reed canarygrass and the single tillers they bore were subjected to various defoliation regimes in the greenhouse to test the degree of interdependence of the two units. On some stems, only the three uppermost blades or the three lowermost blades were preserved, whereas on others all blades were preserved. These treatments were applied to main shoots and tillers in all nine possible combinations. Results measured in terms of stem elongation and yield of dry matter after 7 to 8 leaves had expanded indicated that the 2 units were largely independent. As in previous experiments, the removal of basal blades had little influence on stem elongation or dry matter accumulation above ground. Removing upper blades reduced elongation and, in some cases, yield of the treated stem, but did not much affect its companion.

² Former Research Assistant (now Technical Officer, Overseas Development Department, Plant Protection Ltd. (ICI), London) and Associate Professor of Agronomy, Cornell University.

Received for publication September 13, 1965.