Phloem Loading in Squash | Zendy

John E. Hendrix | Zendy

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Phloem Loading in Squash

Author(s) -

John E. Hendrix

Publication year - 1977

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.60.4.567

Subject(s) - cucurbita pepo , stachyose , phloem , squash , sucrose , moiety , galactose , cucurbitaceae , raffinose , botany , cucurbita , chemistry , biology , biochemistry , stereochemistry

Squash (Cucurbita pepo L. var. melopepo torticalis, Bailey) leaves were supplied with (14)C-sucrose, then specific radioactivities of the glucose and galactose moieties of translocated stachyose were determined. In every case, the specific radioactivity of the galactose moiety was greater than that of the glucose moiety. It is concluded that the stachyose was not synthesized at either the phloem-loading site or subsequent to phloem loading, but rather in cells that were not a part of the translocation system, possibly the mesophyll cells.

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