Translocation of Photosynthatel
نویسنده
چکیده
Sumutwtary. The effect of metabolic inhibition of the sink tisslues oni translocation of 14C-labeled photosynthate was studied by cooling part or all of the sink region in a translocating sugar beet plant (Beta vuilgaris L. var Klein Wanzleben). W\hen the sinlk region was cooled, 4 phases were observed: a temporary declille, a perio(d of translocationi at the pre-treatment rate, a period of decline, and a new steadv' rate at 35 to 45 % of the original rate. The new rate persisted throlughout 26 hoturs of coolinig. Cooling half the blade of a developing leaf cautsed a decline in translocation to the uincooled half. When a portion of the beet was cooled, translocationi to a developing leaf located above the supply leaf node increased 30 %. Translocation into the treated region recovered rapidly and completely when cooling ceased indicating that cooling had not caused serious damage to tissues. Enhancement of the proportion of 14C as sucrose in the cooled portion of the sink leaf as compared with the corresponding warm side indicated that stucrose is the chief species of trans-
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