Abstract
Abstract Leaf anatomy and shoot growth of ‘Harrolds Red Delicious’ (‘HRD’) apple trees treated with succinic acid 2,2-dimethylhydrazide (Alar) were compared with those of an untreated compact mutant strain, ‘Starkrimson Delicious’ (‘SD’). Leaf anatomy of the untreated ‘HRD’ and ‘SD’ were not significantly different. Alar treatments of ‘HRD’ increased thickness of spongy parenchyma, palisade parenchyma, the length but not the no. of palisade cells and total leaf thickness. The site most affected by Alar was the palisade parenchyma. Alar also suppressed shoot growth rate and the treatment effect became noticeable 1 week after treatment. The shoot growth curves were quite similar for ‘SD’ and Alar-treated ‘HRD’.
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