Abstract
We have investigated several factors determining plastid size and number in Peperomia, a genus in the Piperaceae family whose species naturally display great interspecific variation in chloroplast size and number per cell. Using microscopic techniques, we show that chloroplast size and number are differently regulated in the palisade parenchyma and the spongy parenchyma, suggesting that chloroplast division in these cell types is controlled in different ways. Microscopic studies of iodine-stained root cells revealed a correlation between amyloplast size in root cells and chloroplast size in palisade parenchyma cells. However, despite substantial variation in chloroplast number in leaf mesophyll cells, amyloplast number in root cells was very similar in all species. The results suggest that organelle size and number are regulated in a tissue-specific manner rather than in dependency on the plastid type. We also demonstrate that plastid size determines the size but not the number of starch grains in root amyloplasts.
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Claims 5
Claim · model-written summary
Chloroplast size and number were regulated differently in palisade and spongy parenchyma.
- Organ / stage
- palisade parenchyma and the spongy parenchymae0
- Outcome
- chloroplast size and numbere0
- Direction
- differently regulatede0
PeperomiaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chloroplast size and number are differently regulated in the palisade parenchyma and the spongy parenchyma”
e1“Peperomia, a genus”
Claim · model-written summary
Root-cell amyloplast size correlated with palisade-cell chloroplast size.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a correlation between amyloplast size in root cells and chloroplast size in palisade parenchyma cells”
e1“Peperomia, a genus”
Claim · model-written summary
Root-cell amyloplast number was similar across species despite variation in leaf chloroplast number.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“despite substantial variation in chloroplast number in leaf mesophyll cells, amyloplast number in root cells was very similar in all species”
e1“Peperomia, a genus”
Claim · model-written summary
Plastid size determined starch-grain size in root amyloplasts.
- Organ / stage
- root amyloplastse0
- Outcome
- size but not the number of starch grainse0
- Qualifier
- plastid sizee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plastid size determines the size but not the number of starch grains in root amyloplasts”
e1“Peperomia, a genus”
Claim · model-written summary
Plastid size did not determine starch-grain number in root amyloplasts.
- Organ / stage
- root amyloplastse0
- Outcome
- number of starch grainse0
- Direction
- note0
- Qualifier
- plastid sizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plastid size determines the size but not the number of starch grains in root amyloplasts”
e1“Peperomia, a genus”