Organ identity of the thalloid plant body of Griffithella hookeriana and Polypleurum stylosum – Podostemoideae (Podostemaceae)

  title={Organ identity of the thalloid plant body of Griffithella hookeriana and Polypleurum stylosum – Podostemoideae (Podostemaceae)},
  author={Anita Sehgal and Jitendra Paul Khurana and M. S. Sethi and Hussain Ara and Monica Jain},
  journal={Plant Systematics and Evolution},
The morphological nature of the thalloid plant body of podostemads has remained controversial for long. The present investigation was carried out on two members of the Podostemoideae i.e. Griffithella hookeriana and Polypleurum stylosum to understand their organ identity. The origin of the plant body was traced from the embryo by germinating the seeds under aseptic conditions. Mature embryo of both species does not show an identifiable shoot apical meristem (SAM) and root apical meristem (RAM… 

Developmental morphology of seedling and shoot and phylogenetic relationship of Diplobryum koyamae (Podostemaceae).

We demonstrated that saltational evolution was recurrent in the body plans of seedlings of the aquatic angiosperm Podostemaceae, in contrast to other angiosperms with seedlings having almost common

Origin and development of the cryptic shoot meristem in Zeylanidium lichenoides (Podostemaceae).

ZlSTM expression demonstrated that the meristematic identity is partly retained in the embryonic shoot apex of Z. lichenoides and how it is involved in plumular leaf development in the seedling is determined.

Developmental anatomy of seedlings of Indodalzellia gracilis (Podostemaceae).

It is suggested that the Indodalzellia seedling evolved by loss of the adventitious root derived from the hypocotyl, appearance of shoots in the axil of cotyledons, and appearance of adventitious roots from adventitious shoots.

Adaptation to fast-flowing rivers: Loss of vertical body plan in Podostemaceae

Comparative embryonic anatomical studies revealed that the developmental changes in the cellular embryogenesis of Podostemoideae caused the loss of embryonic shoot and root meristems.

Evolution of unusual morphologies in Lentibulariaceae (bladderworts and allies) and Podostemaceae (river-weeds): a pictorial report at the interface of developmental biology and morphological diversification

Lentibulariaceae and Podostemaceae follow structural rules that are different from but related to those of more typical flowering plants, and the roots, stems and leaves are blurred (‘fuzzy’) but both families have stable floral bauplans.

How to get off the mismatch at the generic rank in African Podostemaceae?

The Podostemaceae are highly enigmatic plants which are restricted to submerged river-rock habitats and the availability of new material from continental Africa prompted this new study, which proposes restricting Ledermanniella to the species of the former subgenus Ledermannilla, resurrecting Monandriella as monotypic genus, and accepting the genus name Inversodicraea.

Molecular phylogenetic analysis of Podostemaceae: implications for taxonomy of major groups

Molecular phylogenetic analysis of matK sequences for 657 samples showed that plants of Tristicha (Tristichoideae) and of Weddellina (Weddellinoideae), which are currently treated as monospecific, had great matK differentiation equivalent to at least interspecific variation.

Seedling development in Hanseniella, Hydrobryum and Thawatchaia (Podostemaceae), and implications on body plan evolution in the Hydrobryum clade

An evolutionary scenario is postulate in which the plumule was lost at the divergence of the Hydrobryum clade from the Cladopus clade, much later than the radicle was lost in the clade of Podostemoideae and Weddellinoideae from Tristichoideae.



Origin, Structure, and Interpretation of the Thallus in Hydrobryopsis sessilis (Podostemaceae)

The Indian Podostemoideae are characterized by a dorsiventral thalloid plant body, the nature of which is controversial, and lysigeny precedes the inception of endogenous secondary vegetative shoots.

Seedling developmental anatomy of an undescribed Malaccotristicha species (Podostemaceae, subfamily Tristichoideae) with implications for body plan evolution

Comparison of the seedling development of an undescribed Malaccotristicha species and described patterns of Podostemaceae suggests that the radicle was lost in the early evolution of Podstemaceae and instead adventitious roots replaced it as a leading organ.

Developmental Morphology of Roots and root-borne shoots ofPodostemum subulatum as compared withZeylanidium olivaceum (Podostemaceae—Podostemoideae) Part VII of the series ‘Morphology of Podostemaceae’

The root structure ofPodostemum subulatum is investigated and compared with that ofZeylanidium olivaceum, which appears more advanced than the crustose roots of Zeylanidium, which bear an ordinary (though asymmetrical) root cap.

Comparative developmental anatomy of seedlings in nine species of podostemaceae (subfamily Podostemoideae).

The reduced meristem morphology of seedling roots may be primitive in the Asian-Australian Podostemoideae, and similarities between the unique seedling morphology and mutant Arabidopsis phenotypes are discussed.

Developmental Morphology and Anatomy of the Vegetative Organs in Malaccotristicha malayana (Podostemaceae)

The developmental morphology and anatomy of the highly specialized vegetative organs of Malaccotristicha malayana (Podostemaceae, subfamily Tristichoideae) are described. The plant body can be

Developmental anatomy and branching of roots of four Zeylanidium species (podostemaceae), with implications for evolution of foliose roots.

Results suggest that during evolution from subcylindrical or ribbon-like roots to foliose roots, reduction of meristem exterior to a shoot was delayed and then arrested as a result of inward shifting of the sites of shoot initiation.

Aspects of Floral Biology, Breeding System, and Seed and Seedling Biology in Podostemum ceratophyllum (Podostemaceae)

The functional plant originates from a meristem at the base of the hypocotyl and consists of a prostrate axis from which upright flowering shoots are produced, and the time from germination to flowering in the young plant is less than 2 months.

Shoot apex and spathella: two problematical structures of Podostemaceae–Podostemoideae

The presence of a shoot apex and shoot apical meristem (SAM) is confirmed for Marathrum utile and M. foeniculaceum and the view that the spathella is formed by two fused bracts (hypsophylls) is supported.

Comparative anatomy of root meristem and root cap in some species of Podostemaceae and the evolution of root dorsiventrality.

An anatomical comparison of the root apical meristems and root caps of 33 species that represent the major lineages of the Podostemaceae found evolutionary changes in the meristem preceded the specialization of external root morphologies.