The Mobility of 65zn In Trifolium Subterraneu M L. and Antirrhinum Majus L.

Abstract

SummaryT. subterraneum (cv. Clare) and A. majus were grown in nutrient cultures to which 65Zn was added at two stages in the plants' development. It was found that the 65Zn recently absorbed by the roots was preferentially routed to the youngest leaves. When the plants were transferred from radioactive to non·radioactive cultures, only a limited recirculation of 65Zn took place. In T. 8ubterraneum this was principally from the roots and hypocotyl, but also between and within some leaves, whilst in A. majus recirculation occurred along the stem, roots, and within some leaves.Injection of IOOOl-'g of non-radioactive zinc into the third true leaf of T. subterraneum failed to alter the distribution of 65Zn between leaves, although it did induce movement of 65Zn along the petiole into the lamina of some individual leaves.

Comparative movement of labelled nitrogen and zinc in 1-year-old peach [Prunus persica(L.) Batsch] trees following late-season foliar application

“…Some of these differences may be due to species differences. The degree of mobility could also be influenced by the Zn status of the plant, thus deficient plants would not remobilise Zn well (Longnecker and Robson, 1993); and by the stage of plant development (Millikan et al, 1969). For instance, in wheat, where Zn mobility has been studied extensively, Zn appears to be quite immobile in young growing plants.…”

Transport in Plants I

“…BLEDSOE et aI., 1949;BIDDULPH, 1951BIDDULPH, , 1954SWANSON and WHITNEY, 1953;ZIEGLER, , 1963aBUKOVAC et aI., 1956;BIDDULPH et aI., 1958;ANSIAUX, 1958ANSIAUX, , 1959WELLS and METZ, 1963;LEVI, 1967LEVI, , 1968BAKER, 1969). high Ca2+ concentration in the surroundings of the sieve tubes, Ca2+ can enter the sieve tubes (MILLIKAN and HANGER, 1969;RINGOET et aI., 1967RINGOET et aI., , 1968 and is then translocated like the other constituents in the lumen of the sieve tubes (WIER SUM et aI., 1971). Under certain circumstances, e.g.…”