摘要:

Researches on the morphogenesis of the genus Peyssonnelia Decaisne. — This paper reports the first result on morphogenetic researches in cultures of 3 species of the genusPeyssonneliaDecne. The development ofPeyssonnelia rubra(Grev.) J. Ag. is of «Dumontia type »(CHEMIN, 1937) that one ofPeyssonnelia squamaria(Gmelin) Decne. and ofPeyssonnelia inamoenaPilger of «Naccaria type». According to our cultures results the morphogenesis of genusPeyssonneliais of two type. Sample ofP. squamariaandP. inamoenaare collected in the gulf of Trieste (Nord Adriatic Sea) those of P. cfr.rubrain the Morlaix Bay (English Channel). Taxonomic value of the results are discussed.

ISSN:0017-0070    

DOI:10.1080/11263507209426552

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Floristic affinity of bentonic vegetational types of Cala di Mitigliano (Massa Lubrense Napoli). — We have studied the bentonic plants community in the Cala di Mitigliano. It appears that some species compositions repeat themselves with a certain regularity. This fact lets us recognize and consequently classify them. In Cala di Mitigliano we took an interest and considered only such species compositions. We calculated, in them and between them, the coefficient of affinity by SÖRENSEN(1948). The cluster analysis by average linkage and the use of an index of «individualisation» (Feoli, ined.) based on floristic comparison showed that the species compositions, although we chose such ones to describe the vegetation, equally change gradually from place to place.

ISSN:0017-0070    

DOI:10.1080/11263507209426553

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The genus Allium L. in Italy. IV. A DNA cytophotometric study on the pollen grain of Allium chamaemoly L. — A cytophotometric analysis of DNA contents in pollen generative and vegetative nuclei ofAllium chamaemolyL. was carried out. DNA synthesis in both nuclei was confirmed and a lightly higher DNA amount than 2C in the vegetative nucleus was pointed out. An analysis of the Fast-green stainable histones in the generative and vegetative nuclei was also accomplished. While the generative nucleus had a very high content of Fast-green stainable histone, the vegetative one have nearly no stainable histone. The occurrence of DNA synthesis and the very low histone content suggest the vegetative nucleus is functional and biochemically activ. The higher than 2C DNA content supports the possibility of a DNA amplification process including probably the amplification of ribosomal cistrons in the pollen vegetative nucleus.

ISSN:0017-0070    

DOI:10.1080/11263507209426554

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0017-0070    

DOI:10.1080/11263507209426555

出版商:Taylor & Francis Group    

年代:1972

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:10.1080/11263507209426551

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor