The shoot apex of Podostemaceae: De novo structure or reduction of the conventional type?

Jäger-Zürn, Irmgard

doi:10.1016/j.flora.2007.04.003

Cited by 8 publications

(9 citation statements)

References 35 publications

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“…These interpretations are based on the assumption that the dithecous leaf is the structure that ''subtends'' the branch, and the branch meristem is thus an unusual kind of axillary meristem of the dithecous leaf. The abnormal branching mode remained unclear (Jäger-Zürn, 2007) as long as the branch had been interpreted as developing from the lower sheath of the dithecous leaf.…”

Section: Discussionmentioning

confidence: 99%

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The ramification of Apinagia riedelii: A key to the understanding of the plant architecture of Podostemaceae, subfamily Podostemoideae

Jäger-Zürn¹

2009

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Discussionmentioning

confidence: 99%

“…The position of the branch below the leaf has been referred to as subfoliar (Jäger-Zürn, 1999) or non-axillary (Moline et al, 2006), but a widely accepted interpretation has not been reached (Jäger-Zürn, 2007). Several attempts have been made to explain the abnormal branch position.…”

Section: Introductionmentioning

confidence: 99%

The ramification of Apinagia riedelii: A key to the understanding of the plant architecture of Podostemaceae, subfamily Podostemoideae

Jäger-Zürn¹

2009

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…Such leaves were termed double-sheathed or 'dithecous' by Warming (1881Warming ( , 1891 and others (see Moline et al, 2006Moline et al, , 2007. The occurrence of double-sheathed leaves (among singlesheathed ones) allows the stem to branch by a peculiar process that may be called 'bifurcation' (Jäger-Zürn, 2007). As long as a shoot (module) develops single-sheathed leaves, it grows in a monopodial manner.…”

Section: Morphological Studies In Podostemaceaementioning

confidence: 99%

“…, 2006, 2007). The occurrence of double‐sheathed leaves (among single‐sheathed ones) allows the stem to branch by a peculiar process that may be called ‘bifurcation’ (Jäger‐Zürn, 2007). As long as a shoot (module) develops single‐sheathed leaves, it grows in a monopodial manner.…”

Section: Introductionmentioning

confidence: 99%

Enigmatic morphology ofDjinga felicis(Podostemaceae - Podostemoideae), a badly known endemic from northwestern Cameroon

Ghogue¹,

Ameka

Grob

et al. 2009

Botanical Journal of the Linnean Society

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Djinga is a monotypic genus restricted to the Cameroon Ridge (‘Dorsale Camerounaise’) of NW Cameroon. Besides the type locality Mount Djinga (Adamawa Province, near Tignère), it also grows in waterfalls near Mount Oku (NW Province). This paper describes the structure and development of Djinga felicis using scanning electron microscopy and microtome sections. Cusset's protologue is enriched considerably. Roots are green, dorsiventrally flattened and adherent to submerged rocks. They are broad ribbons or crusts (up to 1 cm broad) which branch exogenously. Root‐borne shoots (up to 17 cm) have filamentous leaves with sheaths and (occasionally) attached stipules. Flowers are borne as part of reproductive short shoots which arise exogenously along the stems and endogenously along the roots. Djinga shows non‐axillary stem branching. Reproductive shoots along the main stem usually stay short. They arise from the abaxial side of double‐sheathed leaves, a key innovation of Podostemoideae. These short shoots shift into pocket‐like stem positions clearly below their associated leaves. Each flower bud inside a spathella is erect, but with an inclined ovary. The flowers are unistaminate with a broad connective. Unlike many other Podostemoideae, the tricolpate pollen grains are arranged in both dyads and monads. The ovary is globular and unilocular. The mature 8‐ribbed capsule dehisces by two slightly unequal valves, releasing 40–50 seeds. © 2009 The Linnean Society of London, Botanical Journal of the Linnean Society, 2009, 160, 64–81.

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“…Jäger-Zürn (2007) interpreted this to mean that there is a horizontally spread single-layered SAM in Zeylanidium subulatum (Gardner) C. Cusset, which belongs to Podostemoideae. However, the data given by Jäger-Zürn (2007) are fragmentary and of low resolution, and so are insufficient to support the presence of the morphologically distinct SAM in Podostemoideae. For example, the SAM interpreted by Jäger-Zürn (2007, Fig.…”

Section: Introductionmentioning

confidence: 96%

Developmental anatomy of the reproductive shoot in Hydrobryum japonicum (Podostemaceae)

2008

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Podostemaceae are unusual aquatic angiosperms adapting to extreme habitats, i.e., rapids and waterfalls, and have unique morphologies. We investigated the developmental anatomy of reproductive shoots scattered on crustose roots of Hydrobryum japonicum by scanning electron microscopy and using semi-thin serial sections. Two developmental patterns were observed: bracts arise either continuously from an area of meristematic cells that has produced leaves, or within differentiated root ground tissue beneath, and internal to, leaf base scars after an interruption. In both patterns, the bract primordia arise endogenously at the base of youngest bracts in the absence of shoot apical meristem, involving vacuolated-cell detachment to each bract separately. The different transition patterns of reproductive shoot development may be caused by different stages of parental vegetative shoots. The floral meristem arises between the two youngest bracts, and is similarly accompanied by cell degeneration. In contrast, the floral organs, including the spathella, arise exogenously from the meristem. Bract development, like vegetative leaf development, is unique to this podostemad, while floral-organ development is conserved.

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The shoot apex of Podostemaceae: De novo structure or reduction of the conventional type?

Cited by 8 publications

References 35 publications

The ramification of Apinagia riedelii: A key to the understanding of the plant architecture of Podostemaceae, subfamily Podostemoideae

The ramification of Apinagia riedelii: A key to the understanding of the plant architecture of Podostemaceae, subfamily Podostemoideae

Enigmatic morphology ofDjinga felicis(Podostemaceae - Podostemoideae), a badly known endemic from northwestern Cameroon

Developmental anatomy of the reproductive shoot in Hydrobryum japonicum (Podostemaceae)

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