Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1
We studied inherent variation in final leaf size among four Poa spp. that live at different elevations. The average final length of leaf 7 of the main stem of the smallest species (Poa alpina) was only one-half that of the largest species (Poa trivialis); it was correlated with leaf elongation rate,...
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ftpubmed:oai:pubmedcentral.nih.gov:59188 2023-05-15T18:01:40+02:00 Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 Fiorani, Fabio Beemster, Gerrit T.S. Bultynck, Lieve Lambers, Hans 2000-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC59188 http://www.ncbi.nlm.nih.gov/pubmed/11027732 en eng American Society of Plant Physiologists http://www.ncbi.nlm.nih.gov/pmc/articles/PMC59188 http://www.ncbi.nlm.nih.gov/pubmed/11027732 Copyright © 2000, American Society of Plant Physiologists Research Article Text 2000 ftpubmed 2013-08-29T08:40:25Z We studied inherent variation in final leaf size among four Poa spp. that live at different elevations. The average final length of leaf 7 of the main stem of the smallest species (Poa alpina) was only one-half that of the largest species (Poa trivialis); it was correlated with leaf elongation rate, but not with the duration of leaf elongation. A faster rate of leaf elongation rate was associated with (a) larger size of the zone of cell expansion, and (b) faster rates of cell production (per cell file) in the meristem, which in turn were due to greater numbers of dividing cells, whereas average cell division rates were very similar for all species (except Poa annua). Also we found that the proliferative fraction equaled 1 throughout the meristem in all species. It was remarkable that rates of cell expansion tended to be somewhat higher in the species with slower growing leaves. We discuss the results by comparing the spatial and material viewpoints, which lead to different interpretations of the role of cell division. Although the presented data do not strictly prove it, they strongly suggest a regulatory role for cell division in determining differences in growth rate among the present four Poa spp. Text Poa alpina PubMed Central (PMC) |
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Research Article |
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Research Article Fiorani, Fabio Beemster, Gerrit T.S. Bultynck, Lieve Lambers, Hans Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 |
topic_facet |
Research Article |
description |
We studied inherent variation in final leaf size among four Poa spp. that live at different elevations. The average final length of leaf 7 of the main stem of the smallest species (Poa alpina) was only one-half that of the largest species (Poa trivialis); it was correlated with leaf elongation rate, but not with the duration of leaf elongation. A faster rate of leaf elongation rate was associated with (a) larger size of the zone of cell expansion, and (b) faster rates of cell production (per cell file) in the meristem, which in turn were due to greater numbers of dividing cells, whereas average cell division rates were very similar for all species (except Poa annua). Also we found that the proliferative fraction equaled 1 throughout the meristem in all species. It was remarkable that rates of cell expansion tended to be somewhat higher in the species with slower growing leaves. We discuss the results by comparing the spatial and material viewpoints, which lead to different interpretations of the role of cell division. Although the presented data do not strictly prove it, they strongly suggest a regulatory role for cell division in determining differences in growth rate among the present four Poa spp. |
format |
Text |
author |
Fiorani, Fabio Beemster, Gerrit T.S. Bultynck, Lieve Lambers, Hans |
author_facet |
Fiorani, Fabio Beemster, Gerrit T.S. Bultynck, Lieve Lambers, Hans |
author_sort |
Fiorani, Fabio |
title |
Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 |
title_short |
Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 |
title_full |
Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 |
title_fullStr |
Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 |
title_full_unstemmed |
Can Meristematic Activity Determine Variation in Leaf Size and Elongation Rate among Four Poa Species? A Kinematic Study1 |
title_sort |
can meristematic activity determine variation in leaf size and elongation rate among four poa species? a kinematic study1 |
publisher |
American Society of Plant Physiologists |
publishDate |
2000 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC59188 http://www.ncbi.nlm.nih.gov/pubmed/11027732 |
genre |
Poa alpina |
genre_facet |
Poa alpina |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC59188 http://www.ncbi.nlm.nih.gov/pubmed/11027732 |
op_rights |
Copyright © 2000, American Society of Plant Physiologists |
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