e-journal

Testing the ontogenetic base for the transient model of inflorescence development

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† Backgrounds and Aims:
Current research in plant science has concentrated on revealing ontogenetic processes of key attributes in plant evolution. One recently discussed model is the ‘transient model’ successful in explaining some types of inflorescence architectures based on two main principles: the decline of the so called ‘vegetativeness’
(veg) factor and the transient nature of apical meristems in developing inflorescences. This study examines
whether both principles find a concrete ontogenetic correlate in inflorescence development.

† Methods:
To test the ontogenetic base of veg decline and the transient character of apical meristems the ontogeny
of meristematic size in developing inflorescences was investigated under scanning electron microscopy.
Early and late inflorescence meristems were measured and compared during inflorescence development in 13
eudicot species from 11 families.

† Key Results:
The initial size of the inflorescence meristem in closed inflorescences correlates with the number of nodes in the mature inflorescence. Conjunct compound inflorescences ( panicles) show a constant decrease of
meristematic size from early to late inflorescence meristems, while disjunct compound inflorescences present
an enlargement by merging from early inflorescence meristems to late inflorescence meristems, implying a qualitative change of the apical meristems during ontogeny.

†Conclusions:
Partial confirmation was found for the transient model for inflorescence architecture in the ontogeny: the initial size of the apical meristem in closed inflorescences is consistent with the postulated veg decline mechanism regulating the size of the inflorescence. However, the observed biphasic kinetics of the development of the apical meristem in compound racemes offers the primary explanation for their disjunct morphology, contrary to the putative exclusive transient mechanism in lateral axes as expected by the model.

Key words: Transient model, inflorescence, ontogeny, conjunct, disjunct, vegetativeness, terminal flower,
raceme, botryoid, panicle, compound raceme, apical meristem.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

Annals of Botany 112: 1543–1551, 2013

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

112: 2013

Subjek

FISIOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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