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The multiple fuzzy origins of woodiness within Balsaminaceae using an integrated approach. Where do we draw the line?

Abstract：

BACKGROUND AND AIMS:The family Balsaminaceae is essentially herbaceous, except for some woodier species that can be described as 'woody' herbs or small shrubs. The family is nested within the so-called balsaminoid clade of Ericales, including the exclusively woody families Tetrameristaceae and Marcgraviaceae, which is sister to the remaining families of the predominantly woody order. A molecular phylogeny of Balsaminaceae is compared with wood anatomical observations to find out whether the woodier species are derived from herbaceous taxa (i.e. secondary woodiness), or whether woodiness in the family represents the ancestral state for the order (i.e. primary woodiness). METHODS:Wood anatomical observations of 68 Impatiens species and Hydrocera triflora, of which 47 are included in a multigene phylogeny, are carried out using light and scanning electron microscopy and compared with the molecular phylogenetic insights. KEY RESULTS:There is much continuous variation in wood development between the Impatiens species studied, making the distinction between herbaceousness and woodiness difficult. However, the most woody species, unambiguously considered as truly woody shrubs, all display paedomorphic wood features pointing to secondary woodiness. This hypothesis is further supported by the molecular phylogeny, demonstrating that these most woody species are derived from herbaceous (or less woody) species in at least five independent clades. Wood formation in H. triflora is mostly confined to the ribs of the stems and shows paedomorphic wood features as well, suggesting that the common ancestor of Balsaminaceae was probably herbaceous. CONCLUSIONS:The terms 'herbaceousness' and 'woodiness' are notoriously difficult to use in Balsaminaceae. However, anatomical observations and molecular sequence data show that the woodier species are derived from less woody or clearly herbaceous species, demonstrating that secondary woodiness has evolved in parallel.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Lens F,Eeckhout S,Zwartjes R,Smets E,Janssens SB

doi

10.1093/aob/mcr310

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

783-99

issue

eissn

0305-7364

issn

1095-8290

pii

mcr310

journal_volume

109

pub_type

杂志文章

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The multiple fuzzy origins of woodiness within Balsaminaceae using an integrated approach. Where do we draw the line?