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Search Results (16)
  • Open Access


    Relationships between the bioactive compound content and environmental variables in Glycyrrhiza uralensis populations in different habitats of North China

    Zhang JT1, B Xu1, M Li2

    Phyton-International Journal of Experimental Botany, Vol.80, pp. 161-166, 2011, DOI:10.32604/phyton.2011.80.161

    Abstract The content of active compounds in Glycyrrhiza uralensis may vary among populations in different regions, and be influenced by environmental variables. We determined the effects of soil and climate on contents of glycyrrhizic acid and liquiritin in various populations of Glycyrrhiza uralensis. Fifty individuals from 5 rangeland populations in arid and semi-arid regions of North China were collected and analyzed. The contents of glycyrrhizic acid and liquiritin were determined using the HPLC method. Contents of glycyrrhizic acid and liquiritin varied significantly among populations as follows: Chifeng > Hangjinqi > Minqin > Aletai > Kashi. These contents were significantly correlated with… More >

  • Open Access


    Seed germination after fire: a study with a plant inhabiting non-fire-prone areas

    Menezes LCCR de1, MN Rossi2

    Phyton-International Journal of Experimental Botany, Vol.80, pp. 153-160, 2011, DOI:10.32604/phyton.2011.80.153

    Abstract After a fire event, germination of seeds with hard coats can be enhanced. In the present study, we investigated whether germination of Mimosa bimucronata (DC.) Kuntze (Fabaceae) seeds, which present hard coats, is increased after fire, even though these trees usually occur in damp areas, where fire is a transient event. Fire events were manipulated in trays filled with soil covered with different amounts of dry grasses, characterizing three treatments: a) 0g (control group); b) 300g, and c) 450g of dry grass. Burning treatments were applied to seeds positioned either on the soil surface or buried in the soil. Germination… More >

  • Open Access


    Diversity patterns of climbing plants and vascular epiphytes in the Valdivian rain forest of South America: a synthesis between 2000 and 2010

    Pincheira-Ulbrich J

    Phyton-International Journal of Experimental Botany, Vol.80, pp. 9-18, 2011, DOI:10.32604/phyton.2011.80.009

    Abstract Knowledge about the diversity patterns of vascular epiphytes and vines in the Valdivian rainforest of South America between 2000 and 2010 was systematized. The method was based on the review of publications available in four electronic databases using keywords. The results showed 12 studies conducted in Chile and two in Argentina, mostly in primary forests within protected areas. Research was carried out essentially at the habitat level, although there were one study at a landscape level and two reviews at a regional scale. The samples used came from ground-based observations and only two studies accessed the canopy of emergent trees.… More >

  • Open Access


    Patch size and shape and their relationship with tree and shrub species richness

    Pincheira-Ulbrich1 J, JR Rau2, F Peña-Cortés1

    Phyton-International Journal of Experimental Botany, Vol.78, pp. 121-128, 2009, DOI:10.32604/phyton.2009.78.121

    Abstract The size and shape of 10 native forest patches were related to tree and shrub species richness in the pre coastal mountain range in Osorno province, southern Chile. Four regression models were adjusted (lineal, logarithm, exponential, and power regression) between patch size (area = x) and tree and shrub species richness (y). Patch shape was quantified through three indexes (Patton diversity index, compactness index and fractal dimension) which were correlated with the tree and shrub richness. Results allowed to conclude that (1) species richness tends to increase significantly with patch size; this relationship was explained by the four study models.… More >

  • Open Access


    Molecular and cultural analysis of seasonal actinomycetes in soils from Artemisia tridentata habitat

    Gonzalez-Franco AC1, L Robles-Hernandez1, A Nuñez-Barrios1, JL Strap2, DL Crawford3

    Phyton-International Journal of Experimental Botany, Vol.78, pp. 83-90, 2009, DOI:10.32604/phyton.2009.78.083

    Abstract In order to understand the temporal dynamics of actinomycete communities of the rhizosphere of the desert plant Artemisia tridentata (sagebrush), two complementary methods were used. They were: (1) 16S rDNA-based PCR coupled with denaturing gradient gel electrophoresis (DGGE), and (2) an agar plate enumeration methodology in which three different media were used to quantify total bacteria, actinomycetes, and fungi. The objective of this research were: (1) to obtain a comprehensive picture of the structure of actinomycete populations, and (2) their dynamics in the rhizosphere of young and old sagebrush plants during two distinct seasons. PCR-DGGE analysis showed that actinomycete groups… More >

  • Open Access


    Patterns of Leymus chinensis in response to grazing exclusion across two steppe habitats in Inner Mongolia: implications for phenotypic plasticity

    Shi G1, ZY Liu1, T Baoyin1, J Sun2, JJ Duan3, XL Li3, GF Yang4

    Phyton-International Journal of Experimental Botany, Vol.87, pp. 236-241, 2018, DOI:10.32604/phyton.2018.87.236

    Abstract Plant functional traits and their effects on rangeland ecosystem function have received much attention by ecologists. However, the importance of functional traits and the interactive effects of grazing exclusion and climate are poorly understood. This study, therefore, aimed to analyse the response of Leymus chinensis functional traits in long-term grazing exclusion in different habitats (rainless typical steppe and rainy meadow steppe). This study showed that although the sensitivity and variability of different traits were similar in two steppe habitats, phenotypic plasticity of L. chinensis in meadow steppe was significantly higher than typical steppes. With the increased degree of plasticity, the… More >

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