A comparison between the record height-to-stem diameter allometries of Pachycaulis and Leptocaulis species.

Abstract:

BACKGROUND AND AIMS:The interspecific allometry of maximum plant height (Hmax) with respect to maximum basal stem diameter (Dmax) has been studied for leptocaulis dicot and conifer tree species. In contrast, virtually nothing is known about the interspecific allometry of pachycaulis species. Here, the interspecific allometries for palms, cacti and cycads are reported and compared with those of leptocaulis dicot and conifer tree species to determine whether pachycauly limits Hmax with respect to Dmax. METHODS:Data for each of a total of 1461 pachycaulis and leptocaulis species were gathered from the primary literature. The scaling exponent and the allometric constant of logHmax vs. logDmax reduced major axis regression curves (and their respective 95 % confidence intervals) were used to compare the four species groups. The stem slenderness ratio (Hmax/Dmax = Rmax) for each species was also computed to compare interspecific trends in trunk shape. KEY RESULTS AND CONCLUSIONS:Each of the four species groups is allometrically unique, i.e. no single 'canonical' maximum plant height to stem diameter allometry exists across all four species groups. Although pachycaulis does not intrinsically limit height, height is nevertheless limited by the size range of basal stem diameter occupied by each species group. Pachycaulis species achieve heights comparable to some leptocaulis species by virtue of very high slenderness ratios attended by an absence or paucity of stem branching. The diversity observed for pachycaulis stem allometries is likely the result of the independent evolutionary origins of this growth habit and the different anatomical strategies used to stiffen stems.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Niklas KJ,Cobb ED,Marler T

doi

10.1093/aob/mcj002

keywords:

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

79-83

issue

1

eissn

0305-7364

issn

1095-8290

pii

mcj002

journal_volume

97

pub_type

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