Abstract
Chlorophyll fluorescence transients from mesophyll and guard cell chloroplasts of variegated leaves from Chlorophytum comosum were compared using high resolution fluorescence spectroscopy. Like their mesophyll counterparts, guard cell chloroplasts showed the OPS fluorescence transient indicating the operation of the linear electron transport and the possible generation of NADPH in these organelles. They also showed a slow fluorescence yield decrease, equivalent to the MT transition in mesophyll, suggesting the formation of the high energy state and photophosphorylation. Unlike the mesophyll chloroplasts, the fluorescence from guard cell chloroplasts lacked the increment of the SM transition, indicating that the two types of chloroplasts have some metabolic differences. The presence of CO(2) (supplied as bicarbonate, pH 6.7) specifically inhibited the MT-equivalent transition while its absence accelerated it. These observations constitute the first specific evidence of a guard cell chloroplast response to CO(2). Control of photosynthetic ATP levels in the guard cell cytoplasm by CO(2) may provide a mechanism regulating the availability of high energy equivalents at the guard cell plasmalemma, thus affecting stomatal opening.
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Claims 5
Claim · model-written summary
Guard cell chloroplasts showed the OPS fluorescence transient.
- Taxon
- Chlorophytum comosum
.jpg?width=60)
Chlorophytum comosumt0 - Organ / stage
- guard cell chloroplastse0
- Outcome
- OPS fluorescence transiente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“guard cell chloroplasts showed the OPS fluorescence transient”
t0“Chlorophytum comosum”
Claim · model-written summary
Guard cell chloroplasts showed a slow fluorescence yield decrease equivalent to the mesophyll MT transition.
- Taxon
- Chlorophytum comosumChlorophytum comosumt0
- Outcome
- slow fluorescence yield decreasee0
- Direction
- decreasee0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They also showed a slow fluorescence yield decrease, equivalent to the MT transition in mesophyll”
t0“Chlorophytum comosum”
Claim · model-written summary
Guard cell chloroplast fluorescence lacked the SM transition increment seen in mesophyll chloroplasts.
- Taxon
- Chlorophytum comosumChlorophytum comosumt0
- Organ / stage
- guard cell chloroplastse0
- Outcome
- increment of the SM transitione0
- Direction
- lackede0
- Comparator
- mesophyll chloroplastse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unlike the mesophyll chloroplasts, the fluorescence from guard cell chloroplasts lacked the increment of the SM transition”
t0“Chlorophytum comosum”
Claim · model-written summary
CO(2) inhibited the MT-equivalent transition in guard cell chloroplasts.
- Taxon
- Chlorophytum comosumChlorophytum comosumt0
- Treatment
- presence of CO(2)e0
- Outcome
- MT-equivalent transitione0
- Direction
- inhibitede0
- Qualifier
- supplied as bicarbonate, pH 6.7e0
- Comparator
- absencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of CO(2) (supplied as bicarbonate, pH 6.7) specifically inhibited the MT-equivalent transition while its absence accelerated it.”
t0“Chlorophytum comosum”
Claim · model-written summary
The absence of CO(2) accelerated the MT-equivalent transition.
- Taxon
- Chlorophytum comosumChlorophytum comosumt0
- Treatment
- absencee0
- Outcome
- MT-equivalent transitione0
- Direction
- acceleratede0
- Comparator
- presence of CO(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of CO(2) (supplied as bicarbonate, pH 6.7) specifically inhibited the MT-equivalent transition while its absence accelerated it.”
t0“Chlorophytum comosum”