Abstract
Photosynthetic pigments were investigated in developing and dried seeds of desiccation-tolerant (orthodox) Acer platanoides and desiccation-sensitive (recalcitrant) Acer pseudoplatanus. The seeds of both Acer species contained higher levels of chlorophyll a (Chl a), particularly in cotyledons, than chlorophyll b (Chl b). Chl a and Chl b peaked during seed morphogenesis, then declined. The decrease was greater in A. platanoides (eight-fold) than in A. pseudoplatanus (three-fold) seeds. The total chlorophyll content was greater in the A. pseudoplatanus seeds only for three weeks, before morphogenesis began in the A. platanoides seeds. Photosystem II activity suggested that photosynthesis might be more active in A. pseudoplatanus at the initial and final stages of seed development. The carotenoid (Car) content increased during the initial stages of A. pseudoplatanus embryo development. The Car/Chl ratio indicated a significant contribution of Car to the pigment pool during the initial stages of development and drying in Acer seeds. The chlorophyll autofluorescence signal was irregular and diffuse in the embryonic axes of mature Acer seeds; however, a spherical and compact autofluorescence signal was reported in A. platanoides cotyledons. Differences in photosynthetic pigments are discussed in relation to seed orthodoxy and recalcitrance, as potentially influencing the longevity variations associated with seed categories.
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Claims 10
Claim · model-written summary
Seeds of both Acer species contained higher chlorophyll a than chlorophyll b, especially in cotyledons.
- Organ / stage
- cotyledonse1
- Outcome
- levels of chlorophyll a (Chl a)e1
- Direction
- highere1
- Comparator
- chlorophyll b (Chl b)e1
AcerOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic pigments were investigated in developing and dried seeds of desiccation-tolerant (orthodox) Acer platanoides and desiccation-sensitive (recalcitrant) Acer pseudoplatanus”
e1“The seeds of both Acer species contained higher levels of chlorophyll a (Chl a), particularly in cotyledons, than chlorophyll b (Chl b)”
Claim · model-written summary
Chlorophyll a and chlorophyll b peaked during seed morphogenesis and then declined in Acer seeds.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic pigments were investigated in developing and dried seeds of desiccation-tolerant (orthodox) Acer platanoides and desiccation-sensitive (recalcitrant) Acer pseudoplatanus”
e2“Chl a and Chl b peaked during seed morphogenesis, then declined”
Claim · model-written summary
The chlorophyll decrease was greater in A. platanoides (eight-fold) than in A. pseudoplatanus (three-fold).
- Taxon
- A. platanoides
Acer platanoidese2 - Outcome
- The decreasee2
- Direction
- greatere2
- Value
- eight-folde2
- Comparator
- A. pseudoplatanuse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The decrease was greater in A. platanoides (eight-fold) than in A. pseudoplatanus (three-fold)”
Claim · model-written summary
Total chlorophyll content was greater in A. pseudoplatanus seeds than in A. platanoides seeds only for three weeks.
- Taxon
- A. pseudoplatanus
Acer pseudoplatanuse3 - Outcome
- total chlorophyll contente3
- Direction
- greatere3
- Qualifier
- only for three weekse3
- Comparator
- A. platanoidese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The total chlorophyll content was greater in the A. pseudoplatanus seeds only for three weeks, before morphogenesis began in the A. platanoides seeds”
Claim · model-written summary
Photosystem II activity suggests that photosynthesis may be more active in A. pseudoplatanus at the initial and final stages of seed development.
- Taxon
- A. pseudoplatanusAcer pseudoplatanuse4
- Organ / stage
- initial and final stages of seed developmente4
- Outcome
- photosynthesise4
- Direction
- more activee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Photosystem II activity suggested that photosynthesis might be more active in A. pseudoplatanus at the initial and final stages of seed development”
Claim · model-written summary
Carotenoid content increased during the initial stages of A. pseudoplatanus embryo development.
- Taxon
- A. pseudoplatanusAcer pseudoplatanuse5
- Organ / stage
- embryo developmente5
- Outcome
- carotenoid (Car) contente5
- Direction
- increasede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The carotenoid (Car) content increased during the initial stages of A. pseudoplatanus embryo development”
Claim · model-written summary
The Car/Chl ratio indicated a significant contribution of carotenoids to the pigment pool during the initial stages of development and drying in Acer seeds.
- Organ / stage
- initial stages of development and dryinge6
- Outcome
- contribution of Car to the pigment poole6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The Car/Chl ratio indicated a significant contribution of Car to the pigment pool during the initial stages of development and drying in Acer seeds”
Claim · model-written summary
The chlorophyll autofluorescence signal was irregular and diffuse in the embryonic axes of mature Acer seeds.
- Organ / stage
- embryonic axese7
- Outcome
- chlorophyll autofluorescence signale7
- Qualifier
- irregular and diffusee7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The chlorophyll autofluorescence signal was irregular and diffuse in the embryonic axes of mature Acer seeds; however, a spherical and compact autofluorescence signal was reported in A. platanoides cotyledons”
Claim · model-written summary
A spherical and compact autofluorescence signal was reported in A. platanoides cotyledons.
- Taxon
- A. platanoidesAcer platanoidese7
- Organ / stage
- cotyledonse7
- Outcome
- autofluorescence signale7
- Qualifier
- spherical and compacte7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The chlorophyll autofluorescence signal was irregular and diffuse in the embryonic axes of mature Acer seeds; however, a spherical and compact autofluorescence signal was reported in A. platanoides cotyledons”
Claim · model-written summary
Differences in photosynthetic pigments may influence the longevity variation associated with seed orthodoxy and recalcitrance in Acer.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The chlorophyll autofluorescence signal was irregular and diffuse in the embryonic axes of mature Acer seeds; however, a spherical and compact autofluorescence signal was reported in A. platanoides cotyledons. Differences in photosynthetic pigments are discussed in relation to seed orthodoxy and recalcitrance, as potentially influencing the longevity variations associated with seed categories”