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- W2070361932 abstract "1. Tomato, turnip, and cotton plants were grown in sand culture and supplied with nutrient containing either 0 or 5 p.p.m. boron; each of these groups was divided into three treatment series. One series was maintained without additional treatment, a second was sprayed three times weekly with a sugar solution (10% sucrose), and a third was sprayed at the same frequency with a sugar-boron solution (10% sucrose containing 5 p.p.m. boron). 2. Plants of all species grown on 0-p.p.m. boron nutrient and not sprayed with a solution containing boron exhibited symptoms of boron-deficiency. Sugar applications, however, resulted in a slight improvement in growth compared with unsprayed boron-deficient plants. The growth of tomato and turnip plants sprayed with a sugar-boron solution was more like that of plants grown on nutrient solution containing boron. Cotton plants, on the other hand, did not exhibit such a response. 3. Boron-deficient unsprayed turnip and cotton plants had a lower percentage total sugar and a higher percentage starch content of their leaves than did non-deficient unsprayed plants. In leaves of tomatoes there was no significant difference between the two groups in the percentage total sugar, but the starch fraction in deficient plants was much lower. Sugar applications to boron-deficient plants resulted in an increase of total carbohydrates in the leaves of tomato and cotton, as compared with unsprayed plants. This was not true for turnip. 4. The roots of tomato and turnip plants on deficient boron had a significantly lower percentage carbohydrate content than did those of plants receiving adequate boron. This appears to have been the result of a decreased carbohydrate transport to these organs because of necrosis of the phloem. In cotton, where no phloem necrosis was observed, roots of deficient plants contained a percentage total carbohydrate equivalent to that found in non-deficient plant roots. 5. For a given species, leaves of plants receiving adequate boron from the substrate had a significantly higher boron content than did those of plants on a deficient level. The leaves of plants on deficient nutrient and sprayed with a sugar-boron solution were intermediate in boron content. 6. The data obtained in this investigation have been discussed in reference to the proposed role of boron in translocation of carbohydrates in plants." @default.
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- W2070361932 date "1956-09-01" @default.
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- W2070361932 title "Responses of Tomato, Turnip, and Cotton to Variations in Boron Nutrition. I. Physiological Responses" @default.
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