Wyniki wyszukiwania

1

Sex chromatin and Y chromosomes in dioecious species, Rumex acetosa L.

100%

Mosiolek M., Pedrosa-Harand A., Schweizer D., Joachimiak A. J.

Acta Biologica Cracoviensia. Series Botanica. Supplement

|

2005

|

tom 47

|

nr 1

2

Effects of site conditions on sexual dimorphism and sex ratio in lowland populations of Aruncus sylvestris Kostel. (Rosaceae)

84%

Marciniuk J., Marciniuk P., Rymuza K.

Polish Journal of Ecology

|

2010

|

tom 58

|

nr 2

Studies on sexual dimorphism in reference to vegetative features and on the sex ratio in different environmental conditions were carried out in lowland populations of dioecious species Aruncus sylvestris. It was shown that female individuals of Aruncus sylvestris produced higher flowering shoots, longer inflorescences, more leaves and longer and broader leaves than the male ones. All listed differences were statistically significant. In populations of Aruncus sylvestris growing in optimum ecological conditions (fertile and wet soil, half-light) the sex ratio M/F is close to 1:1. Changes of ecological conditions along the gradient of fertility, habitat moisture (estimated by the types of phytocoenoses) and intensity of solar radiation caused marked drift of sex structure towards the male domination. Light intensity was the crucial factor for the sex ratio in studied populations. Populations growing in half-light showed sex ratio M/F ≈ 1:1 irrespective of habitat. Those growing in shade and in full light showed significant shift to male dominance. The largest deviation from 1:1 sex ratio (M/F ≈ 1.0:0.2) was observed in extremely unfavorable habitat conditions (full sun irradiance, dry soil, strong competition from Elymus repens (L.) Gould). Obtained results demonstrated that female individuals of Aruncus sylvestris had markedly higher habitat requirements compared with the male ones.

3

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Natural regeneration and gender-specific spatial pattern of Taxus baccata in an old-growth population in Foresta Umbra (Italy)

84%

Vessella F., Salis A., Scire M., Piovesan G., Schirone B.

Dendrobiology

|

2015

|

tom 73

English yew is rare and endangered dioecious species. Research on regeneration processes of endangered taxa is important to understand the mechanisms allowing a species to survive under several ecological scenarios, to predict future distribution shifts, to achieve best management practices and conservation policies. Our investigation was focusing on one of the oldest yew population in Europe, in Foresta Umbra in Italy. The main aim of this study was to understand spatial regeneration processes and dynamics related with parent trees’ sex distribution. Geostatistical analysis showed that seedlings occur in patches avoiding direct competition with adult yews. Negative relationship between regeneration and yew density and basal area was found. A general model for the reproductive ecology is proposed: females are less competitive and more environmentally demanding than males, because of their reproductive effort. Indeed, male and female fitness responds differently across environmental gradients, thus favouring spatial segregation of seedlings. Understanding the yew’s adaptive effectiveness is essential to ensure the conservation of existing populations, and encourage the species’ resilience into areas where yew is endangered.

4

Age dynamics of telomere length of Baikal gastropods is sex-specific and multidirectional

84%

Maximova N., Koroleva A., Sitnikova T., Khanaev I., Bukin Y., Kirilchik S.

Folia Biologica

|

2017

|

tom 65

|

nr 4

5

Breeding and cultivation of industrial hemp in Poland

84%

Grabowska L., Rebarz M., Chudy M.

Herba Polonica

|

2009

|

tom 55

|

nr 3

328-334

In recent years we are witnesses of the growth of interest in agriculture, industry and environmental movements in reproducible plant materials, including fibrous hemp – a plant attractive both to the agriculture and many industries. In addition to traditional textile use, the use of hemp found, inter alia, in the paper industry, construction materials, automotive, energy, cosmetics, pharmaceutical and chemical industries. Also in Poland, after the crisis, the growth of interest in hemp is demonstrated by the increase in area from 100 ha in 2003 to more than 1,600 ha in 2008. In Poland, work with hemp breeding started in 1946. At that time, the content of crude fiber in straw was only 14.3%. As a result of the multi-breeding work out this contents grew to 25–30%. The first the Polish monoecious hemp variety, entered in 1968 in the Register of Varieties is Białobrzeskie. This variety of high economic value has successfully grown to this days not only in Poland, but also in the European Union. At present, in the National Register of COBORU there are five varieties of monoecious hemp grown in INF&MP: Białobrzeskie, Beniko, Silesia, Tygra and Wielkopolskie. These are varieties adapted to Polish climate and soil conditions. When applied for proper growing conditions, they ensure high and stable yields. In accordance with the requirements of the Drugs Act of 29 July 2005, which regulates the cultivation of hemp in Poland, all Polish varieties and breeding prospective families contain less than 0.2% of hallucinogens. Growing hemp does not require, as a rule, use of plant chemical protection, provides high yields, leaving the soil in a very good structure. The new varieties, technologies and cultivation of cannabis harvest to total mechanization and obtain the raw material for specific technological parameters, caused the hemp plant has become attractive for both agriculture and industry.

6

Variation in sex expression in Polish and Ukrainian populations of Taxus baccata L.

84%

Iszkulo G., Jasinska A. K.

Dendrobiology

|

2004

|

tom 52

29-32

The aim of the present study was to analyse the occurrence of monoecious individuals in selected populations of Taxus baccata in Poland and Ukraine. The investigation showed the monoecy in Taxus baccata to be extremely rare phenomenon. Only four cosexual individuals were found in three by seven populations examines and the frequency of monoecy was 0.13% on average among 2986 trees verified. Isolated seeds were found on individuals with large number of male flowers. Only one tree was found with numerous macro- and microstrobiles.

7

Sex-related differences in the dioecious species Rumex thyrsiflorus Fingerh. – analysis of the content of phenolic constituents in leaf extracts

84%

Dziedzic K., Szopa A., Waligorski P., Ekiert H., Slesak H.

Acta Biologica Cracoviensia. Series Botanica

|

2020

|

tom 62

|