A relationship between boron & auxin in C14 translocation in bean plants

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Abstract
Bean plants, Phaseolus vulgaris var. Black Valentine, were used in experiments designed to test the hypothesis that the role of B in translocation is indirect, the B exerting its influence on this process through its effect on metabolic activity at sites of utilization. Applications of naphthaleneacetic acid to the meristems of B-deficient plants in the absence of added B, promoted increased translocation of photosynthetically incorporated C14. It was therefore concluded that the B-deficient plant, prior to phloem necrosis, possesses a translocation system capable of functioning and that it functions at a much reduced capacity because substrates are not being utilized. It is consequently quite clear that B deficient plants are not limited in growth by sugar deficiency and that B is not necessary to sugar translocation per se. The relationship between B and auxin is considered and the suggestion revived that B is essential to auxin metabolism, possibly synthesis.