Abstract
In order to test the positive net CO2-fixation ability of tepals in the flower bud of Lilium hyb. enchantment, photoautotrophic characters were studied during pollen development in tepals and then compared with those in the leaf. Although mesophyll structure, plastid ultrastructure, stomata density, and chlorophyll content were significantly different in both organs, tepals performed positive net CO2-fixation from the microspore mother cell stage up to pollen mitosis but not during pollen maturation. The measurements of CO2-fixation were performed in the linear part of the saturation curve of the L5 leaf at 100 μmol photon m-2 s-1. In the tepals, CO2-fixation} reached its maximal intensity at the tetrad stage with 1.83 ± 0.12 μmol CO2 m-2 s-1, against 3.17 ± 0.27 μmol CO2 m-2 s-1 in the L5 leaf. Under these conditions, tepal CO2-fixation corresponded to 57.7% of the leaf assimilation, whereas the maximum chlorophyll concentration in the tepal represented 21.9% of the chlorophyll concentration in the leaf. The flower bud of Lilium may be considered not solely as a sink structure for the whole plant but also as a partly autonomous organ in terms of photosynthates.
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Claims 7
Claim · model-written summary
Tepals and leaves differed significantly in mesophyll structure, plastid ultrastructure, stomata density, and chlorophyll content.
Verbatim
e0“mesophyll structure, plastid ultrastructure, stomata density, and chlorophyll content were significantly different in both organs”
e1“flower bud of Lilium hyb. enchantment”
e2“tepals performed positive net CO2-fixation from the microspore mother cell stage up to pollen mitosis but not during pollen maturation”
e3“against 3.17 ± 0.27 μmol CO2 m-2 s-1 in the L5 leaf”
Claim · model-written summary
Tepals fixed CO2 positively from microspore mother cell stage through pollen mitosis, but not during pollen maturation.
Verbatim
e0“tepals performed positive net CO2-fixation from the microspore mother cell stage up to pollen mitosis but not during pollen maturation”
e1“flower bud of Lilium hyb. enchantment”
Claim · model-written summary
Tepal CO2 fixation peaked at the tetrad stage at 1.83 ± 0.12 μmol CO2 m-2 s-1.
Verbatim
e0“In the tepals, CO2-fixation} reached its maximal intensity at the tetrad stage with 1.83 ± 0.12 μmol CO2 m-2 s-1”
e1“flower bud of Lilium hyb. enchantment”
Claim · model-written summary
L5 leaf CO2 fixation was 3.17 ± 0.27 μmol CO2 m-2 s-1.
Verbatim
e0“against 3.17 ± 0.27 μmol CO2 m-2 s-1 in the L5 leaf”
e1“CO2-fixation} reached its maximal intensity at the tetrad stage”
e2“flower bud of Lilium hyb. enchantment”
Claim · model-written summary
Tepal CO2 fixation equaled 57.7% of leaf assimilation under the stated conditions.
Verbatim
e0“tepal CO2-fixation corresponded to 57.7% of the leaf assimilation”
e1“flower bud of Lilium hyb. enchantment”
Claim · model-written summary
Maximum tepal chlorophyll concentration was 21.9% of leaf chlorophyll concentration.
Verbatim
e0“maximum chlorophyll concentration in the tepal represented 21.9% of the chlorophyll concentration in the leaf”
e1“flower bud of Lilium hyb. enchantment”
Claim · model-written summary
The Lilium flower bud may be partly autonomous in photosynthate production.
LiliumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The flower bud of Lilium may be considered not solely as a sink structure for the whole plant but also as a partly autonomous organ in terms of photosynthates.”