摘要:

Proteolytic activity on basic proteins in seeds of Bellardia trixago (L.) All. - A SH-proteinase was isolated from dormant seed ofBellardia trixago(L.) All. The enzyme, which was active on basic proteins, showed its optimum activity at pH 4.8. The natural substrate of enzyme was not yet identified, but its presence in the dormant seeds was ascertained.

ISSN:0017-0070    

DOI:10.1080/11263508209428031

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Phenols seasonal variations in Betula alba L. buds. - Estimation of the seasonal variations in the totals endogenous phenols levels inBetula albaL. buds is given.

ISSN:0017-0070    

DOI:10.1080/11263508209428032

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The Leaf Specific Conductivity (LSC) of nodal and internodal segments of 1-year-old twigs ofVitis viniferaL. andPopulus deltoidesBartr. was measured. It turned out to be greater in the internodes than in the nodes in both species, the differences being much bigger inVitisthan inPopulus. The nodes can be considered as « hydraulic constriction zones » of the stem. Their resistance to flow increases acropetally in both species, causing a characteristic hyperbolic behaviour of the water potential gradients along the twigs inVitis, while inPopulusit is not so marked. Some hypotheses are advanced about the possible functional significance of the nodes.

ISSN:0017-0070    

DOI:10.1080/11263508209428033

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The present study tries to clarify the anatomical basis of the hydraulic properties of the internodes and nodes of one-year-old twigs ofVitis viniferaL. andPopulus deltoidesBartr‥ In particular, the higher resistance to flow as exhibited by the nodal regions of both species, appears to be due to a lower number of large-diameter vessels in the nodes as compared with that in the internodes. InPopulus, beside this aspect, the nodal constriction is also due to a larger number of narrow-diameter vessels.

ISSN:0017-0070    

DOI:10.1080/11263508209428034

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Starch accumulates mainly in the parenchyma of the inner bark and of the wood. The quantity of stored starch changes through the yearly cycle. Such changes in starch content can be related to growth in diameter and in length of the stem, i.e.: a) growth in length mostly occurs at the expense of the stored starch causing a quick spring decrease of starch content in the storage tissues; b) growth in diameter occurs only partially at the expense of the stored starch.

ISSN:0017-0070    

DOI:10.1080/11263508209428035

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Influence of altitudinal, seasonal and environmental factors on the production of the active principles in Helleborus odorus subsp. laxus (Host.) Merxm. & Pod. - The influence of some factors (altitude, season, environment) on the production of the active principles ofHelleborus odorussubsp.laxus(Host) Merxm. & Pod. is examined. The samples have been taken at different altitudes and from different environments during various phases of the biological-cycle, in an area on the southern border of the Carnia-prealps zone (Friuli-Venezia Giulia). Only the two main active principles present in the hypogeous organs of such entity, hellebrin and saponin (Rf = 0.63), are considered because in previous works it was demonstrated that such secondary metabolites are chemotaxonomic markers for these entities. Quantitative analysis undertaken separately on roots and rhizomes, have shown a connection between variations of hellebrin and saponin (Rf = = 0.63) contents and physical-environmental factors. In particular it has been found that during the activity period of the plant the quantity of the two previously mentioned principles increases according to the altitude. Various anomalous environmental characteristics such as reafforestation, inhabited areas, steep sunny slopes, seemed to increase the production of the two active principles.

ISSN:0017-0070    

DOI:10.1080/11263508209428036

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Anthocyanin pigments in hypocotyls and cotyledons of Raphanus sativus L. seedlings. - Raphanus sativusL. seedlings growing in darkness do not form anthocyanins. Etiolated seedlings grown in CAP 10−4M, exposed 48 h after sowing to far red light accumulate large quantity of anthocyanins in hypocotyls and cotyledons. This amount of pigments is bigger than that formed by seedlings grown in water and irradiated with white light. However, in both cases, the only anthocyanidin present was pelargonidin and pelargonin the only detectable anthocyanin.

ISSN:0017-0070    

DOI:10.1080/11263508209428037

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Ultrastructure of the apical cell of Halopteris scoparia (L.) Sauvageau (Phaeophyceae, Sphacelariales). - The ultrastructure of resting apical cells ofHalopteris scoparia(L.) Sauvageau from material collected in December is described. The cytoplasm is higly vacuolated with lipids, poliphenolic substances and polisaccharides occurring inside the vacuoles (the classic « physodes »).

ISSN:0017-0070    

DOI:10.1080/11263508209428038

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Observations on Rytiphloea tinctoria (Clem.) C. Ag. ball-forms in Stagnone waters (Western coast of Sicily). - Observations onRytiphloea tinctoriaball-form community in a coastal lagoon (Stagnone, Sicily) are reported. The discovery of « intermediate » benthopleustophyte forms (the attached form is absent in the lagoon) mirrors the different hydrodynamic conditions that are found in the area. No fructification of any sort was seen throughout the large number of specimens dredged. Comparative investigations between the ball and attached form shows a certain degree of variation in the « habitus », while the anatomical structure is similar. The ball-forms ofRytiphloea tinctoriacan be thought as an ecotype.

ISSN:0017-0070    

DOI:10.1080/11263508209428039

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Phallogaster saccatus Morgan, new to Italy. - In the present paper the first finding in Italy of the gasteromycetesPhallogaster saccatusMorgan is described.

ISSN:0017-0070    

DOI:10.1080/11263508209428040

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor