Premium
Translocation of labelled assimilates following photosynthesis of 14 CO 2 by the field bean, Vicia faba
Author(s) -
Crompton Hilary J.,
LloydJones C. P.,
HillCottingham D. G.
Publication year - 1981
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1981.tb02697.x
Subject(s) - photosynthesis , main stem , vicia faba , point of delivery , biology , chromosomal translocation , botany , stem and leaf display , sink (geography) , horticulture , agronomy , biochemistry , cartography , gene , geography
When whole plants were exposed to 14 CO 2 , almost the same amount of radioactivity was taken up initially by each leaf regardless of its position on the stem and of the presence of beans at that node. Thus, although developing beans are a powerful sink for assimilated carbon, they do not increase the CO 2 uptake by adjoining leaves. The distribution of labelled assimilates 6 hours after feeding 14 CO 2 to a single leaf for 1 hour varied with both the position of the treated leaf and the stage of development of the plant. Before any flowers were set most of the radioactivity from all expanded leaves moved downwards to the roots and the stem below the treated leaf (lower stem). Later, during pod‐fill, the upper leaves maintained this supply to the roots and lower stem, whilst most of the carbon translocated from the lower and mid‐stem leaves went to the beans. However, we found no exclusive relationship between a leaf and the supply to beans developing on the same node. The amount of radioactivity moving out of a source leaf at a fruiting node increased over successive samplings up to 48 h; the pattern of distribution of the 14 CO 2 however remained virtually unchanged.