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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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The progressive and ancestral traits of the secondary xylem within Magnolia clad - the early diverging lineage of flowering plants

100%
Wroblewska M. M.
Acta Societatis Botanicorum Poloniae
|
2015
|
tom 84
|
nr 1
The qualitative and quantitative studies, presented in this article, on wood anatomy of various species belonging to ancient Magnolia genus reveal new aspects of phylogenetic relationships between the species and show evolutionary trends, known to increase fitness of conductive tissues in angiosperms. They also provide new examples of phenotypic plasticity in plants. The type of perforation plate in vessel members is one of the most relevant features for taxonomic studies. In Magnolia, until now, two types of perforation plates have been reported: the conservative, scalariform and the specialized, simple one. In this paper, are presented some findings, new to magnolia wood science, like exclusively simple perforation plates in some species or mixed perforation plates – simple and scalariform in one vessel member. Intravascular pitting is another taxonomically important trait of vascular tissue. Interesting transient states between different patterns of pitting in one cell only have been found. This proves great flexibility of mechanisms, which elaborate cell wall structure in maturing tracheary element. The comparison of this data with phylogenetic trees, based on the fossil records and plastid gene expression, clearly shows that there is a link between the type of perforation plate and the degree of evolutionary specialization within Magnolia genus.
2

Lato z magnolią

84%
Gawrys W.
Ogrody, Ogródki, Zieleńce
|
2007
|
nr 07
3

Magnolia

84%
Falencka-Jablonska M.
Aura
|
2018
|
nr 05 Dodatek Ekologiczny dla Szkół nr 282
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Geometric parameters of the apical meristem and the quality of phyllotactic patterns in Magnolia flowers

84%
Wiss D., Zagorska-Marek B.
Acta Societatis Botanicorum Poloniae
|
2012
|
tom 81
|
nr 3
The ratio of primordium size to the meristem size (P/M ratio) is regarded by some geometrical models of phyllotaxis as the parameter, which determines the quality of spiral and whorled patterns of lateral organ arrangement. This assumption was tested on floral meristems in four genets representing four Magnolia taxa: M. × salicifolia, M. stellata, M. denudata and M. acuminata. In successive zones of Magnolia flower, lateral organs are initiated in specific phyllotactic patterns and at specific values of the meristem and primordia sizes. The elements of perianth, usually positioned in three trimerous whorls, are initiated as large primordia on relatively small meristem. The switch in the identity of primordia, from tepals to stamens is accompanied by an abrupt increase in the size of the meristem and decrease in the primordia size. Small values of P/M ratio and frequent occurrence of qualitative transformations of phyllotaxis contribute to the exceptionally rich spectrum of spiral patterns in androecium zone. New spiral patterns emerge when bigger primordia of carpels are initiated on the meristem, which at the same time starts diminishing in size either abruptly (M. × salicifolia, M. stellata, M. acuminata) or slowly (M. denudata). Spiral patterns identified in gynoecia have lower numbers of parastichies than the patterns of androecia and occur in frequencies specific for the genet. Although noted ranges of the meristem and primordia sizes, justify the occurrence of phyllotactic patterns observed in successive zones of Magnolia flower, they do not explain genet-specific frequencies of the patterns observed in gynoecium zone. The lack of straightforward relationship between frequency of the patterns and P/M ratio in gynoecium suggests that more complex geometrical factors or factors of non-geometrical nature are engaged in determination of Magnolia floral phyllotaxis.
5

Phyllotaxic diversity in Magnolia flowers

84%
Zagorska-Marek B.
Acta Societatis Botanicorum Poloniae
|
1994
|
tom 63
|
nr 2
117-137
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Morphological and biochemical responses to gibberellic acid in Magnolia × ‘Spectrum’ in vitro

84%
Wojtania A., Skrzypek E., Gabryszewska E.
Acta Biologica Cracoviensia. Series Botanica
|
2016
|
tom 58
|
nr 1
The total soluble sugar content and antioxidant enzyme activities were studied for the first time during axillary shoot formation in Magnolia × ‘Spectrum’ in vitro in response to BAP (0.3 mg lˉ¹), different levels of gibberellic acid (GA3; 0.0, 0.1, 0.5, 1.0 mg lˉ¹), sucrose (20 and 30 g lˉ¹) and nitrogen salts (KNO3/NH4NO3; 100/100% and 75/50% relative to MS medium). Among various GA3 and sucrose/nitrogen salts ratios, the most effective axillary multiplication (5.9 shoots/explant) and leaf formation (25.7 leaves per multiplied clumps) were obtained after addition of GA3 at 0.1 mg lˉ¹ to a BAP medium containing 20 g lˉ¹ sucrose and reduced levels of nitrogen salts (75% KNO3 and 50% NH4NO3). The addition of GA3 to the BAP medium enhanced shoot formation by 36% and leaf formation by 27%. The highest shoot formation capacity of M. × ‘Spectrum’ in vitro coincided with enhanced levels of soluble sugar and peroxidase (POD) activity. Increasing GA3 concentration from 0.1 to 1.0 mg lˉ¹ in the above medium resulted in inhibition of shoot and leaf formation and a decrease in the soluble sugar content. The influence of GA3 on the activities of catalase (CAT) and POD depended on its concentration and the levels of sucrose and nitrogen salts in the medium. The highest increase in CAT and POD activities, that coincided with the enhanced shoot formation capacity of M. × ‘Spectrum’ in vitro, was observed after addition of GA3 to the medium containing high levels of sucrose and nitrogen salts.
7

Krucha uroda i orientalny wdzięk

67%
Zymon S.
Ogrody, Ogródki, Zieleńce
|
2008
|
nr 04
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Physiological response of in vitro cultured Magnolia sp. to nutrient medium composition

67%
Sokolov R. S., Atanassova B. Y., Iakimova E. T.
Journal of Horticultural Research
|
2014
|
tom 22
|
nr 1
9

Pachnace krzewy

59%
Bojarczuk T.
Działkowiec
|
1999
|
nr 03
14-15
10

Oczarowaly nas magnolie

59%
Zymon S.
Kwietnik
|
1998
|
nr 05
38-43
11

Festiwal magnolii

51%
Gawrys A.
Kwietnik
|
2009
|
nr 03
22-27
12

Najnowsza pęcherznica

51%
Kwietnik
|
2011
|
nr 04
13

Dla kazdego cos nowego

43%
Kwietnik
|
2007
|
nr 08
32-34
14

Drzewa malych przestrzeni. Cz.2. Odmiany o kolorowych kolumnach

43%
Frazik-Adamczyk M.
Szkółkarstwo
|
2004
|
nr 3
12
15

Biel w ogrodzie

42%
Szydlo W.
Kwietnik
|
2002
|
nr 05
48-50
16

Na tropie magnolii

42%
Pokorny G.
Kwiaty
|
1995
|
nr 1
4-5
17

Roslina miesiaca. Magnolia

34%
Kwietnik
|
2000
|
nr 05
26-27
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