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In vitro study reveals β-inhibitor causes significant hypertrophy of phloem and ray cells, suggesting a link to bark disease.
Balsam fir bark was cultured aseptically on a nutrient medium. When β-inhibitor was added to the agar medium, extreme hypertrophy of phloem parenchyma and ray cells occurred. This hypertrophy gave rise to a conspicuous swelling which resembled the bark malformations, known as 'gout disease', caused by the balsam woolly aphid.
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Bonga et al. (1965) studied this question.
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