Apetiolar Photosynthate Translocation | Zendy

Ivan Chiu-Sheung Choi | Zendy; S. Aronoff | Zendy

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Apetiolar Photosynthate Translocation

Author(s) -

Ivan Chiu-Sheung Choi,

S. Aronoff

Publication year - 1966

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.41.7.1130

Subject(s) - chromosomal translocation , petiole (insect anatomy) , transpiration , transpiration stream , photosynthesis , leaf blade , biology , botany , water transport , chemistry , water flow , hymenoptera , biochemistry , environmental engineering , gene , engineering

Apetiolar transport of photosynthate (-14)C has been studied by feeding of (14)CO(2) to soybean petioles. Translocation occurs in the absence of leaves, but both the rate and velocity are diminished. The effect of root excision is not as profound as that of leaves. It appears, in some instances, to inhibit transport partially, so that accumulation of photosynthate develops, giving a steeper isotopic gradient. The effect of leaf darkening is to diminish its uptake of photosynthate from the petiole, possibly as a result of decreased transpiration in the lowered temperature of the darkened leaf. The data suggest that neither mass flow nor active transport provide an adequate basis for normal photosynthate transport but that the leaves provide a direct force requiring structural continuity, or a translocation carrier.

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