摘要:

Photomorphogenic responses induced by UV-B radiation in Brassica oleracea var. capitata.—Ultraviolet radiation can induce a plethora of “damaging” and “non damaging” effects in higher plants. We analyzed two possible photomorphogenic responses to UV-B radiation, the anthocyanin accumulation and the inhibition of hypocotyl elongation by modifying the UV spectral range with specific cut-off filters, under two levels of photon fluence rate. Experimental results suggest that detrimental effects are due to shorter wavelenghts of UV-B region (less than 305 nm); in contrast some adaptative responses may be induced by longer wavelenghts of UV-B region (between 305 and 320 nm). We attempted to determine the involvment of endogenous anthocyanin content in the UV-B photoprotection. Our experiments suggest a secondary role of anthocyanin accumulation in UV-B plant adaptation.

ISSN:0017-0070    

DOI:10.1080/11263509509436168

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The growth, chlorophyll and carotenoid contents of wheat and maize seedlings as influenced by a soil drench of 250 μM of tridemorph or fenpropimorph, were studied. It was found that the length of the shoot, primary leaf, and root, as well as the leaf area were significantly reduced in the fungicide treated seedlings. Although the dry matter percentage was higher in the treated seedlings as compared to the control, the fresh or dry weight per shoot remained lower in the fungicide treated seedlings. The chloroplast pigments in the treated seedlings of both crops were unaffected, suggesting that the fungicides had no significant effect on the chlorophyll or carotenoid biosynthesis.

ISSN:0017-0070    

DOI:10.1080/11263509509436169

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The presence of a trade–off between growth and reproduction was tested in four sites in a subalpine Norway spruce (Picea abies(L.) Karst.) forest by measuring annual stem diameter increments at breast height and seed and cone productions during the periods 1962–1985 and 1983–1990, respectively. Trees growing in forest stands near the timber line (about 1900 m above sea level) had the greatest reduction in annual stem diameter increment during mast years; while trees growing at about 1300–1500 m above sea level did not show any reduction. Trees growing at about 1700 m showed only a limited reduction. At the same elevation, trees growing within closed forest stands suffered a greater reduction in stem growth when compared with trees growing at the edge of a cutting.

ISSN:0017-0070    

DOI:10.1080/11263509509436170

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The germination percentage ofAegilops geniculataRoth caryopses was studied on four Italian populations (Pisa, Manfredonia, Catania and Simbirizzi). Observation of the germination trend was carried out at constant temperatures of 10°, 20° and 30°C, from maturation up to 60 days after harvesting. Spike, spikelet and caryopsis phenotypic characteristics were also studied. The populations of Pisa, Manfredonia and Simbirizzi presented two different types of caryopses: yellow caryopses - larger, heavier and composing roughly 60% of total—and brown caryopses—smaller and lighter in weight. The Catania population formed an exception in that brown caryopses were virtually absent (5%). This Sicilian accession also showed the largest spikelet size.

ISSN:0017-0070    

DOI:10.1080/11263509509436171

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Preliminary observations on the ecology of sessile oak (Quercus petraea (Matt.) Liebl.) seedlings.—The responses of sessile oak seedlings to four different light intensities and to increasing drought (three soil moisture contents) have been investigated in a nursery experiment in order to improve the knowledge of the ecology of this species in the Mediterranean area. Data have been compared with observations on natural regeneration established in different shade and soil moisture conditions in a sessile oak stand. The results of the two experiments showed that low light intensities (transmittance <5%) did not limit the seedlings establishment but induced lowest growth rates, while in full daylight seedlings mortality was very high (61%). In accordance with the observations in natural conditions, seedlings showed the best performances at intermediate light levels (50–80% of full daylight) and with increasing soil moisture: mortality was very low and average height increment, dry weight, relative growth rate (RGR) and net assimilation rate (NAR) showed the highest values. The differences in specific leaf area (SLA), leaf area ratio (LAR), root/stem ratio enabled to discuss the sessile oak seedlings ecology and adaptations to different light intensities and soil moisture content.

ISSN:0017-0070    

DOI:10.1080/11263509509436172

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The author deals with the results of a research on the presence of Aphyllophorales in Sasso Fratino Forest, an Integral Natural Reserve, inside the Foreste Casentinesi National Park. The research started in 1987 and till now 171 wood-inhabiting species have been collected. Some of them are new to the Italian mycoflora:Antrodiella fissiliformis, Ceriporia alachuana, Laeticorticium meridioroseum, Parvobasidium cretatum, Pycnoporellus fulgens,while some other must be considered very rare species in Italy:Ganoderma carnosum, Lobulicium occultum, Stereum insignitum, Trechispora echynocystis.

ISSN:0017-0070    

DOI:10.1080/11263509509436173

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

ISSN:0017-0070    

DOI:10.1080/11263509509436174

出版商:Taylor & Francis Group    

年代:1995

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:10.1080/11263509509436167

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor