Abstract
Summary Perennial ryegrass (Lolium perenne L.) and couch grass (Agropyron repens (L.) Beauv.) plants were raised in a glasshouse and transferred to growth rooms at 24°c and 70% relative humidity under a light intensity of 1,200 foot-candles. A single spot of 14C-labelled urea, amitrole, or maleic hydrazide was placed at the base of a mature leaf lamina. The translocation of 14C after periods of 3 to 48 hours was determined by gross autoradiography. While 14C from urea applied to the main tiller or to a side tiller of perennial ryegrass tended to remain in the treated tiller, label from amitrole and especially MH showed more widespread translocation in both the symplast and apoplast. Covering or defoliating a tiller increased the quality of label that moved to such a tiller from an intact, illuminated tiller to which labelled solution was applied. Export of 14C from the treated leaf of couch grass occurred more slowly than in perennial ryegrass. Although some assimilates (as evidenced by tracer movement) m...
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