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Stimulation of source‐applied 14 C‐sucrose export in Vicia faba plants by brassinosteroids, GA 3 and IAA
Author(s) -
Petzold U.,
Peschel S.,
Dahse I.,
Adam G.
Publication year - 1992
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1992.tb00517.x
Subject(s) - vicia faba , sucrose , sink (geography) , stimulation , chemistry , botany , horticulture , biophysics , biology , biochemistry , endocrinology , cartography , geography
SUMMARY The effect of brassinosteroids (SSHB, 24‐Epi), GA 3 and IAA on sucrose uptake and export from source leaf was studied in Vicia faba plants. Brassinosteroids, GA 3 and IAA applied exogenously to the source leaves were found to enhance the retention of 14 C‐label and stimulate the uptake in discs of source leaves during 4‐h treatment. The hormone‐promoted sucrose uptake is probably due to modulation of the H + ‐ATPase activity as indicated by increasing V max ‐values for sucrose uptake. Enhanced transport of 14 C‐compounds to the apical sink region was observed in SSHB‐ and GA 3 ‐treated plants after 24 h. SSHB, GA 3 and IAA applied to the sink region of Vicia plants, promoted 14 C‐radiolabel transport to the site of hormone‐treated region. On the basis of this observation, we conclude that, like GA 3 and IAA, brassinosteroids affect 14 C‐unloading processes.