the translocation of minerals in trees - Canadian Forest Service

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FIGURE 2. Autoradiograph of longitudinal section of wood and bark of white pine stem showing localization of calcium" in phloem. FIGURE 3. Crystals in phloem of white pine (dark rectangular shapes in centre of picture). 12 FIGURE 4. Autoradiograph of section shown in Figure 3. The black areas indicate the presence of calcium" in the crystals.
FIGURE 5a. Longitudinal sections of yellow birch buds in natura. FIGURE 5b. Autoradiograph of yellow birch buds shown in Figure 5a, indicating presence of calcium". dominant to the suppressed tree. The failure of the isotopes to move in trees with oak wilt led to the discovery that xylem vessels in the aerial parts were plugged with tyloses and gum. Tukey et al (1955) applied cotton gauze which had been dipped into solutions of potassium42 carbonate and ortho phosphoric32 acid, around branches of apple trees and peach trees. Within 24 hours of application during February and March, even with freezing temperatures, radioactivity was detected within the branches 18 to 24 inches above and below the points of application. Similar applications made just. as the buds were beginning to swell indicated that the activity moved through the bark, up through the branches and concentrated near the buds, presumably to be available for the flush of new growth. The work of these investigators indicated that nitrogen, phosphorus, potassium, and rubidium applied to leaves are transported both acropetally and basipetally. Calcium, strontium, and barium do not move from the absorbing plant part, and basipetal transport is negligible. Ferrel and Hubert (1952), in a study of the pole blight condition in western white pine (Pine monticola Dougl.) in Idaho, found that phosphorus and calcium had unusual distribution in pole-blighted trees. In diseased trees, phosphorus content was found to be higher than in normal trees and the calcium content lower. This greater accumulation of phosphorus was considered related to the more rapid radioisotope movement up the pole-blighted trees and associated with the greater transpiration. Farrar (1953) also noted greater movement of phosphorus32 into older needles of red pine as compared with newly formed needles. Tamm (1951) reported that the composition of rain water samples collected beneath trees, as compared with samples from an open field, contained considerable amounts of calcium, potassium and sodium, together with smaller amounts of nitrogen and phosphorus. 13
Page 1 and 2: CANADA Department of Northern Affai
Page 3: CONTENTS PAGE INTRODUCTION. . . . .
Page 6 and 7: on the fact that the living cell is
Page 8 and 9: solutions and determining the miner
Page 10 and 11: FIGURE 1. Monitoring movement of ru
Page 14 and 15: SUMMARY AND CONCLUSIONS It appears
Page 16: STEDIBACH, H. B. 1951. Permeability

the translocation of minerals in trees - Canadian Forest Service

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