Modifications of Translocation Rate in Studies of Apple Leaf Efficiency |
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Authors: | PRIESTLEY C A |
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Institution: | East Malling Research Station Maidstone, Kent, ME19 6BJ |
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Abstract: | M.7 apple rootstocks were used during the peak period of shootextension for comparisons of dry-matter production per unitleaf area between intact plants and others which had been partiallydefoliated. Dry-matter increment per unit leaf area over a 16-dayinterval was some 70 per cent higher in partially defoliatedplants than in controls. 14CO2 was supplied to designated leaves of comparable age andposition. Sample discs were taken from the fedleaves at intervals up to 9 days from supplying 14CO2. Translocationrates were estimated by comparison with leaves on a third setof plants whose petioles were steamed to prevent translocationimmediately on removal of the 14CO2 feeding chambers. Translocationrates in partially defoliated plants were enhanced some 30 percent compared with controls. It is suggested that features of the plant outside the studiedleaves may have contributed to the overall efficiency of assimilateproduction and utilization. Malus sylvestris L., apple, dry matter production, leaf efficiency, defoliation, translocation, assimilate distribution, sorbitol, sucrose |
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