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Sucrose: a solute that accumulates in the guard‐cell apoplast and guard‐cell symplast of open stomata
Author(s) -
Lu Ping,
Zhang Shu Qiu,
Outlaw William H.,
Riddle Kimberly A.
Publication year - 1995
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(95)00239-6
Subject(s) - apoplast , symplast , guard cell , sucrose , transpiration , vicia faba , chemistry , botany , biophysics , biology , biochemistry , cell wall , photosynthesis
Stomatal conductances of Vicia faba leaves were recorded over a day. Coordinately, (a) guard cells dissected from leaflets were assayed, providing total sucrose content, and (b) guard cells dissected from rinsed epidermes were also assayed, providing symplastic sucrose content. Compared with that of pre‐dawn samples, apoplastic sucrose content increased 4.8 – 5.2 × (2 experiments), reaching 1,130 – 1,300 fmol·guard‐cell‐pair −1 at midday, when conductance was highest (ca. 0.13 mol·m −2 ·s −1 ); symplastic sucrose content increased 2.5 – 3.5 ×, reaching 350 – 390 fmol·guard‐cell‐pair −1 . Thus, there is a correlation between transpiration and guard‐cell sucrose content, particularly that portion localized to the apoplast. Moreover, apoplastic sucrose is apparently a source of guard‐cell nutrition and, possibly, osmoticum.