Abstract
Leaf ontogeny of tropical evergreen tree species lasts several months with changes in size, shape, colouration and internal tissue distribution of leaves. Leaf initiation in Saraca asoca generally occurs once in a year during February–April, followed by very limited leafing thereafter. We measured the rate of photosynthesis, chlorophyll a fluorescence, energy quenching and PSII functions during the leaf ontogeny process. Observations were taken up to 35 days after opening of lamina (DAOL). Significant increase in the synthesis and accumulation of photosynthetic pigments but negative net photosynthesis was noticed during initial days of the ontogeny. The leaf moved from heterotrophy to autotrophy with gradual improvement of PSII functions. The ratio of intercellular CO2 (Ci) and ambient CO2 (Ca) showed significant change at ≥11 DAOL. Increase in the age of the leaf (between 5 and 28 DAOL) caused decrease in O-J rise and corresponding increase in J-I and I-P rise as well as of fluorescence maximum (FM) of the OJIP curve. The improvement of the electron transport components of the donor side of PSII was seen with increase in the functional oxygen evolving complex. The functional improvements of the donor and acceptor side of PSII during leaf ontogeny are discussed.
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Claims 9
Claim · model-written summary
Leaf initiation generally occurs once yearly during February–April.
- Taxon
- Saraca asoca
_flowers_in_Kolkata_W_IMG_4146.jpg?width=60)
Saraca asocae0 - Outcome
- Leaf initiatione0
- Value
- once in a yeare0
- Qualifier
- during February–Aprile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_flowers_in_Kolkata_W_IMG_4146.jpg?width=500)
Verbatim
e0“Leaf initiation in Saraca asoca generally occurs once in a year during February–April, followed by very limited leafing thereafter.”
Claim · model-written summary
Photosynthetic pigments significantly accumulated early in leaf ontogeny.
- Organ / stage
- initial days of the ontogenye0
- Outcome
- synthesis and accumulation of photosynthetic pigmentse0
- Direction
- increasee0
Not reportedTaxon
Verbatim
e0“Significant increase in the synthesis and accumulation of photosynthetic pigments but negative net photosynthesis was noticed during initial days of the ontogeny.”
Claim · model-written summary
Net photosynthesis was negative during initial leaf ontogeny.
Not reportedTaxon
Verbatim
e0“Significant increase in the synthesis and accumulation of photosynthetic pigments but negative net photosynthesis was noticed during initial days of the ontogeny.”
Claim · model-written summary
Leaves transitioned from heterotrophy to autotrophy as PSII function improved.
Not reportedTaxon
Verbatim
e0“The leaf moved from heterotrophy to autotrophy with gradual improvement of PSII functions.”
Claim · model-written summary
The Ci/Ca ratio changed significantly at 11 days after lamina opening or later.
Not reportedTaxonDirection
Verbatim
e0“The ratio of intercellular CO2 (Ci) and ambient CO2 (Ca) showed significant change at ≥11 DAOL.”
Claim · model-written summary
O-J rise decreased with leaf age from 5 to 28 DAOL.
Not reportedTaxon
Verbatim
e0“Increase in the age of the leaf (between 5 and 28 DAOL) caused decrease in O-J rise and corresponding increase in J-I and I-P rise as well as of fluorescence maximum (FM) of the OJIP curve.”
Claim · model-written summary
J-I and I-P rise increased with leaf age from 5 to 28 DAOL.
Not reportedTaxon
Verbatim
e0“Increase in the age of the leaf (between 5 and 28 DAOL) caused decrease in O-J rise and corresponding increase in J-I and I-P rise as well as of fluorescence maximum (FM) of the OJIP curve.”
Claim · model-written summary
Fluorescence maximum increased with leaf age from 5 to 28 DAOL.
Not reportedTaxon
Verbatim
e0“Increase in the age of the leaf (between 5 and 28 DAOL) caused decrease in O-J rise and corresponding increase in J-I and I-P rise as well as of fluorescence maximum (FM) of the OJIP curve.”
Claim · model-written summary
Donor-side electron transport improved with an increase in functional oxygen evolving complex.
- Organ / stage
- donor side of PSIIe0
- Outcome
- electron transport components of the donor side of PSIIe0
- Direction
- improvemente0
- Qualifier
- functional oxygen evolving complexe0
Not reportedTaxon
Verbatim
e0“The improvement of the electron transport components of the donor side of PSII was seen with increase in the functional oxygen evolving complex.”