Abstract
Abstract Extracts of strawberry (Fragaria × ananassa Duch.) receptacles contain a soluble invertase and a bound invertase which can be extracted with 1 m NaCl. Both soluble and salt-extracted invertases had a pH optimum of 4.6. The soluble invertase was more sensitive than salt-extracted invertase to inhibition by I2 and HgCl2. The soluble invertase activity was high at an thesis and decreased markedly during receptacle growth. In contrast, salt-extracted invertase activity increased 80% to 100% during receptacle growth induced either by pollination or by the application of NAA. The possible role of salt-extracted invertase in establishing sink activity during auxin-induced strawberry receptacle growth is discussed. Chemical names used. 1-naphthaleneacetic acid (NAA).
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