摘要:

Keys, illustrations, descriptions, and ecological notes are provided for nine species ofPolysiphoniafrom Scandinavia:P. arctica, P. brodiaei, P. elongata, P. hemisphaerica, P. lanosa, P. nigra, P. nigrescens, P. urceolata, andP. violacea. Taxonomical and nomenclatural questions are discussed with special reference to the application of the specific epithetviolacea. On the basis of examination of type material,P. fibrillosais considered conspecific withP. violacea, as this species is currently circumscribed, while the entity to which this name was originally applied is probably the same asP. nigrescensandP. fucoides.

ISSN:0017-0070    

DOI:10.1080/11263508309428076

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Chlorophyllase activity and photosynthetic membrane proteins of two lots ofHedera helixwere studied. Both the HV variety with variegated leaves and HC variety with green leaves were observed. Proteins from green, white and white-green portions of leaves differing in age were compared using dodecyl-sulfate-polyacrylamide gel electrophoresis. The white or white-green regions ofHedera helixvar.aureomarginata(HV) did not differ significantly in chlorophyllase activity.

ISSN:0017-0070    

DOI:10.1080/11263508309428077

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The present paper reports the effects of morphactin on leaf morphology and stomatal apparatus ofVigna radiata. Morphactin treated plants showed fusion of leaflets resulting in the formation of a simple leaf with various modifications or amplification giving rise to tetra-, penta-, and multifoliate leaves simulating palmate leaves. The area of leaflets and petiole size of treated plants were considerably reduced. Morphactin also changed the form of stomata with paracytic, anisocytic and anomocytic types observed. A reduction in frequency of stomata, size of epidermal cells, trichomes and stomatal pore were common with an increase in stomatal size on the abaxial surface. Aberrations such as contiguous stomata, stomatal degeneration and stomata having a single guard cell were noted. Since the action of morphactin is in the direction of reducing transpiration, the application of this substance may be helpful in cultivation of crops exposed to periodic dry conditions.

ISSN:0017-0070    

DOI:10.1080/11263508309428078

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Post-fire sequences in microfungal soil populations in Mount Argentario (Toscana region). A research program was conducted to investigate the post-fire sequences of microfungal populations in Thyrrenian Coastal soils. This paper reports the results of the first year of that study. An initial reduction of fungi was followed by a gradual reconstruction process characterized by a constant increase of colonies and species. The periodic after fire analysis permitted an initial understanding of the possible selective role of the fire and its consequences on some microfungal species.

ISSN:0017-0070    

DOI:10.1080/11263508309428079

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Two rare Aphyllophorales: Phellinus erectus and Oxyporus latemarginatus. - The presence of the two rareAphyllophoralesspecies,Phellinus erectusDavid, Dequatre & Fiasson andOxyporus latemarginatus(Dur. & Mont.) Donk are reported for the first time in Italy.

ISSN:0017-0070    

DOI:10.1080/11263508309428080

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Measurements of Leaf Specific Conductivity (LSC) of the vertical water potential gradients and of vessels diameters in 1-year-old twigs of young olive trees have been made. LSC prooves to vary along the twigs differently from other species we have already studied in that it is significantly lower in the proximal twig's segment. Consequently, the water potential gradients are in this region higher so indicating that a higher resistance to flow exists.

ISSN:0017-0070    

DOI:10.1080/11263508309428081

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Carotenoids (two carotenes, five free xanthophylls and seven xanthophyll esters previously isolated and identified, Cardini 1982) were measured in apple leaves from the early spring to autumn senescence; a detailed quantitative investigation on different senescence stages was also carried out.

ISSN:0017-0070    

DOI:10.1080/11263508309428082

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue

ISSN:0017-0070    

DOI:10.1080/11263508309428075

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor