Seeds of some temperate plants require multiple treatments to break complex forms dormancy, such as deep simple double morphophysiological dormancy (MPD), but embryo growth and radicle cotyledon emergence have not been studied in depth for this level MPD. Here we Trillium camschatcense, a species that is purported MPD sensitive habitat fragmentation with decreased recruitment at forest edges.Trillium camschatcense seeds were collected experiments conducted Hokkaido, Japan over 5 years....

The effects of temperature on embryo growth, radicle emergence and cotyledon Gagea lutea ( Liliaceae ), a perennial herb widely distributed in Europe, eastern Siberia, the Kurile Islands, Sakhalin Far East, were monitored outdoors laboratory tests. In Japan, this species inhabits open secondary grasslands deciduous forests. Seeds with an underdeveloped are dispersed late May/early June Hokkaido. elongates autumn, emerges from seed mid-October to mid-November, at temperatures about 15/4°C....

Only a few studies have considered the possibility that low temperature requirements may vary among stages of dormancy break in seeds with morphophysiological (MPD). We show this lack consideration previous on seed and germination Aegopodium podagraria might explain percentages and/or relatively long periods incubation needed for germination. Under natural temperatures, embryos began to grow September were fully elongated by late December; most growth occurred when average daily mean was...

Abstract In Japan the black locust ( Robinia pseudoacacia L.) is undergoing rapid habitat expansion, which has an adverse effect on native vegetation. It therefore a priority to clarify regeneration characteristics of and establish adequate management this invasive species in Japan. To determine germination physically dormant seeds, we observed anatomical features seed coat identified water gap that acts as signal detector. Our microscopic observations showed coats had hilum, micropyle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon permeability of dilauroylphosphatidylethanolamine monolayer at the polarized nitrobenzene/water interfaceTakashi Kakiuchi, Tetsuya Kondo, Mitsuyoshi Kotani, and Mitsugi SendaCite this: Langmuir 1992, 8, 1, 169–175Publication Date (Print):January 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/la00037a032https://doi.org/10.1021/la00037a032research-articleACS PublicationsRequest...

Erythronium japonicum (Liliaceae) (Japanese name, katakuri) is indigenous to Japan and adjacent Far East regions. We examined their embryo elongation, germination, seedling emergence in relationship the temperature. In incubators, seeds did not germinate at 20°/10° (light 12 h/dark h alternating temperature), 20°, 15°, 5°, or 0°C with a 12-h light photoperiod for 200 d. They germinated 15°/5° 10°C, starting on day 135. If were kept 20° 25°/15°C before being exposed 5°C, germinated, but if...

In an investigation of seed germination in Cardiocrinum cordatum var. glehnii , embryos fresh seeds October were underdeveloped and did not grow until September the following year. Then, they grew rapidly had fully elongated by early November. second spring after dispersal, radicles emerged under snow late March snowmelt April. Cotyledons soon radicles. several laboratory experiments, at 15°/5°C (light 12 h/ dark h) 25°/15°C. Radicles from with 5°–15°C cold stratification 0°–5°C. 2 wk a...

Abstract The phase properties of dipalmitoylphosphatidylserine(DPPS) monolayer at a polarized nitrobenzene–water interface have been studied by measuring the double-layer capacitance interface, Cdl, under precise control potential drop across interface. When saturated DPPS was in contact with an aqueous 0.1 mol dm−3 LiCl solution, Cdl took value 9.5 μF cm−2. presence Ca2+ or Mg2+ greater than 2 mmol induced decrease down to 1.5 cm−2, corresponding transition from liquid-expanded condensed...

A formate oxidase activity was found in the crude extract of a formaldehyde-resistant fungus isolated from soil. The classified and designated as Aspergillus nomius IRI013, which could grow on medium containing up to 0.45% formaldehyde consumed completely. specific grown be considerably higher than that extracts methanol. Formate purified homogeneity. enzyme had relative molecular mass 100 000 composed two apparently identical subunits 59 000. showed highest using substrate. Hydrogen...

Temperate forests are disjunct in the Northern Hemisphere, having become fragmented from earlier widespread (Tertiary) boreotropical forest. We asked 'What contemporary patterns of population variation ecological traits a Tertiary relict macroecological context?'. This issue underpins our understanding populations occurring same biome but on different continents.We examined characters associated with root and shoot emergences among Viburnum opulus temperate Asia, North America Europe....

In Japan, the herbaceous perennial Corydalis ambigua Cham. et Schlecht. occurs in Tohoku and Hokkaido, where it grows deciduous woodlands. Seeds have an underdeveloped embryo that is physiologically dormant at time of dispersal late May. laboratory experiments, embryos did not grow when kept continuously 5 °C or alternating diurnal temperatures 25/15 °C. However, following warm stratification °C, they grew 15/5 continued to do so 0 Radicles emerged after a relatively long period then...

Abstract To better understand the germination ecophysiology of genus Lonicera , dormancy class, temperature requirements for embryo growth and radicle emergence phenology seedling were determined caerulea var. emphyllocalyx . At maturity, seeds have an underdeveloped (approximately 28% length full‐grown embryos). Embryos in fresh grew to full at 15, 20, 20/10 25/15°C within 3 weeks, but failed grow ≤ 10°C 30°C. Radicles emerged from 86–100% freshly matured light 28 days, emerge 10°C. equally...

Aromatic amine dehydrogenase was purified and characterized from Alcaligenes xylosoxidans IFO13495 grown on beta-phenylethylamine. The molecular mass of the enzyme 95.5 kDa. consisted heterotetrameric subunits (alpha2beta2) with two different masses 42.3 kDa 15.2 N-terminal amino acid sequences alpha-subunit (42.3-kDa subunit) beta-subunit (15.2-kDa were DLPIEELXGGTRLPP APAAGNKXPQMDDTA respectively. had a quinone cofactor in showed typical absorption spectrum tryptophan...

Abstract Seeds with epicotyl dormancy reside in soil up to 15 months (or longer), being exposed a sequence of temperatures, before seedlings completely emerge (i.e. both roots and shoots). Heretofore, few studies have examined precise especially sequences, for promotion radicle cotyledon emergence how they relate environmental cues nature. Viburnum is the best known genus exhibit and, as such, we investigated Japanese V. furcatum , hypothesizing similar kind level dormancy. The...