Abstract:
:Leaflets of Vicia faba with closed stomata or with opening stomata were freeze-dried. Excised guard-cell pairs were assayed individually under suboptimal conditions (pH 7.1 and subsaturating substrate) for phosphoenolpyruvate carboxylase (PEPC; EC 4.1.1.31) using quantitative histochemical procedures. L-Malate, 400 microM, significantly inhibited guard-cell PEPC activity of closed stomata but not that of opening stomata. We postulate that the lessened sensitivity of guard-cell PEPC activity to malate inhibition is an important regulatory feature of stomatal opening, which is associated with malate accumulation.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Zhang SQ,Outlaw WH Jr,Chollet Rdoi
10.1016/0014-5793(94)00916-3subject
Has Abstractpub_date
1994-09-19 00:00:00pages
45-8issue
1eissn
0014-5793issn
1873-3468pii
0014-5793(94)00916-3journal_volume
352pub_type
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