Can meristematic activity determine variation in leaf size and elongation rate among four Poa species?: A kinematic study

被引:49
作者
Fiorani, F
Beemster, GTS
Bultynck, L
Lambers, H
机构
[1] Univ Utrecht, NL-3584 CA Utrecht, Netherlands
[2] State Univ Ghent VIB, Dept Plantengenet, Genet Lab, B-9000 Ghent, Belgium
[3] Univ Western Australia, Fac Agr, Nedlands, WA 6907, Australia
关键词
D O I
10.1104/pp.124.2.845
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
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收藏
页码:845 / 855
页数:11
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