SUCROSE - A SOLUTE THAT ACCUMULATES IN THE GUARD-CELL APOPLAST AND GUARD-CELL SYMPLAST OF OPEN STOMATA

被引:68
作者
LU, P
ZHANG, SQ
OUTLAW, WH
RIDDLE, KA
机构
[1] FLORIDA STATE UNIV,DEPT BIOL SCI,TALLAHASSEE,FL 32306
[2] BEIJING AGR UNIV,COLL BIOL SCI,BEIJING 100094,PEOPLES R CHINA
关键词
GAS EXCHANGE; GUARD CELL; STOMA; SUCROSE; VICIA FABA;
D O I
10.1016/0014-5793(95)00239-6
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Stomatal conductances of Yicin 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 4.8-5.2x (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 2.5-3.5x, 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.
引用
收藏
页码:180 / 184
页数:5
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