e-journal

Identification and characterization of ten new water gaps in seeds and fruits with physical dormancy and classification of water-gap complexes

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† Background and Aims:
Physical dormancy (PY) occurs in seeds or fruits of 18 angiosperm families and is caused by awater-impermeable palisade cell layer(s) in seed or fruit coats. Prior to germination, the seed or fruit coat of species with PY must become permeable in order to imbibe water. Breaking of PY involves formation of a small opening(s) (water gap) in a morpho-anatomically specialized area in seeds or fruits known as the water-gap complex. Twelve different water-gap regions in seven families have previously been characterized. However, the water-gap regions had not been characterized in Cucurbitaceae; clade Cladrastis of Fabaceae; subfamilies Bombacoideae, Brownlowioideae and Bythnerioideae of Malvaceae; Nelumbonaceae; subfamily Sapindoideae of Sapindaceae; Rhamnaceae; or Surianaceae. The primary aims of this study were to identify and describe the water gaps of these taxa and to classify all the known water-gap regions based on their morpho-anatomical features.

† Methods:
Physical dormancy in 15 specieswas broken by exposing seeds or fruits towet or dry heat under laboratory
conditions.Water-gap regions of fruits and seeds were identified and characterized by use of microtome sectioning, light microscopy, scanning electron microscopy, dye tracking and blocking experiments.

† KeyResults:
Ten newwater-gap regionswere identified in seven different families, and two previously hypothesized regions were confirmed.Water-gap complexes consist of (1) an opening that forms after PY is broken; (2) a specialized
structure that occludes the gap; and (3) associated specialized tissues. In some species, more than one opening is involved in the initial imbibition of water.

†Conclusions:
Based on morpho-anatomical features, three basic water-gap complexes (Types-I, -II and -III) were identified in species with PY in 16 families. Depending on the number of openings involved in initial imbibition, the water-gap complexes were sub-divided into simple and compound. The proposed classification system enables understanding of the relationships between the water-gap complexes of taxonomically unrelated species with PY.

Key words: Chalaza, dye tracking, fruit coat, hilum, micropyle, palisade cells, physical dormancy, PY breaking, seed coat, water-gap complex.

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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: 69–84, 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

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Subjek

PEMULIAAN TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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