О ПОЛОВОЙ СТРУКТУРЕ ПОПУЛЯЦИЙ НЕКОТОРЫХ ДВУДОМНЫХ РАСТЕНИЙ, "БОТАНИЧЕСКИЙ ЖУРНАЛ"

2012 ◽  
pp. 1163-1174
Author(s):  
Е.И. ДЕМЬЯНОВА

В результате многолетних исследований (1976-1982 гг.), проведенных в разных ботанико-географических районах, определено соотношение полов у 12 двудомных растений: Cannabis sativa, Rumex acetosella, R. acetosa, R. thyrsiflorus, Melandrium album, Silene densiflora, S. wolgensis, S. artemisetorum, Asparagus officinalis , Cirsium arvense, Stratiotes aloides, Hydrocharis morsus-ranae.

2012 ◽  
pp. 1533-1550
Author(s):  
Е.И. ДЕМЬЯНОВА

У четырех двудомных растений (Asparagus officinalis, Melandrium album, Silene densiflora, S. artemisetorum) изучены вторичные половые признаки у обеих половых форм, способствующие перекрестному опылению и завязыванию семян в условиях лесостепного Зауралья.


Author(s):  
J.S. Rowarth ◽  
A.A. Johnson ◽  
P.T.P. Clifford ◽  
M.P. Rolston

Weed seeds are the major reason for white clover (Trifolium repens) seedlots being downgraded or rejected from certification. The occurrence of weed species in 537 white clover seedlots tested at the Official Seed Testing Station, Palmerston North, was analysed. The most commonly occurring species were field madder (Sherardia arvensis), chickweed (Stellaria media), fathen (Chenopodium album), sheep's sorrel (Rumex acetosella) and scarlet pimpernel (Anagaflis arvensis). The percentage occurrence of four specified undesirable weeds including Californian thistle (Cirsium arvense) and dodder (Cuscuta epithymum) are reported, and the implications of seed contamination are discussed. Keywords: white clover, contamination, weed seeds


Weed Science ◽  
1981 ◽  
Vol 29 (4) ◽  
pp. 455-461 ◽  
Author(s):  
J. Ray Frank ◽  
J. A. Simon

Six species of 2- or 3-yr-old woody nursery stock were planted in the field in May 1976. Glyphosate [N-(phosphonomethyl) glycine] at 2.2 or 4.5 kg/ha or paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) at 0.6 or 1.1 kg/ha were applied one or two times as directed sprays in 1976 and one, two, or three times each season in 1977 and 1978. Three applications of glyphosate or paraquat were required to control weeds during the entire growing season. When late-season applications of glyphosate were made during 1977, residual weed control was observed during early 1978. When glyphosate was applied twice a year for 3 yr at 4.5 kg/ha, four of the previously dominant perennial weeds were controlled, including common dandelion (Taraxacum officinaleWeber), broadleaf dock (Rumex obtusifoliusL.), buckhorn plantain (Plantago lanceolataL.), and red sorrel (Rumex acetosellaL.). Three applications provided 100% control of seven of the eight remaining broadleaf perennials, including hedge bindweed (Convolvulus sepiumL.) and Canada thistle [Cirsium arvense(L.) Scop.]; six of seven species of broadleaf annuals, including Pennsylvania smartweed (Polygonum pensylvanicumL.) and tumble pigweed (Amaranthus albusL.); and all of the remaining grass weeds. Crop size, crop quality, and marketability of the six ornamental species were not adversely affected by either herbicide. Two or three applications of glyphosate at 2.2 kg/ha or two treatments at 4.5 kg/ha increased plant size of andorra junipers (Juniperus horizontalisRend.). Three treatments of glyphosate at 2.2 kg/ha also increased the size of dwarf Japanese yews (Taxus cuspidataSieb. & Zucc.) and two treatments at 4.5 kg/ha increased the size of boxleaf Japanese holly (Ilex crenataThunb.).


Weed Science ◽  
1975 ◽  
Vol 23 (6) ◽  
pp. 458-461 ◽  
Author(s):  
A. G. Ogg

Canada thistle [Cirsium arvense(L.) Scop.] and field bindweed (Convolvulus arvensisL.) were controlled in asparagus (Asparagus officinalisL. ‘Mary Washington’) fields by repeated applications of dicamba (3,6-dichloro-o-anisic acid) at 0.6 kg/ha or 2,4-D [(2,4-dichlorophenoxy)acetic acid] + dicamba at 1.1 + 0.3 or 1.1 + 0.6 kg/ha. Applications of 2,4-D + dicamba at 1.1 + 0.6 kg/ha in early May and again in mid-June controlled 97% of the Canada thistle in asparagus fields. A third application about August 1 was required to give similar control of field bindweed. Rates of dicamba exceeding 0.6 kg/ha injured the asparagus.


Author(s):  
Jürgen Seifert ◽  
Jann Schlimme ◽  
Felix Wedegärtner ◽  
Hinderk M. Emrich ◽  
Udo Schneider

Überblick: Cannabis sativa ist eine der ältesten medizinischen Heilpflanzen. In den westlichen Kulturen wird Cannabis überwiegend als Freizeitdroge angesehen. Im Harz sowie in den Blüten der weiblichen Pflanze findet sich ein Gemisch aus verschiedenen psychoaktiven Inhaltsstoffen. Am bedeutendsten ist in diesem Zusammenhang das delta-9-Tetrahy-drocannabinol. </P><P> Epidemiologie: Nicht selten werden die Gefahren des Cannabiskonsums, wie z. B. die Möglichkeit der Induktion einer Psychose unterschätzt. Wenn man jedoch berücksichtigt, wie häufig z. B. Jugendliche THC konsumieren, ist die Frage, ob Cannabis eine Psychose aus dem schizophrenen Formenkreis de novo induzieren kann, von besonderem gesundheitspolitischem und volkswirtschaftlichem Interesse. Die Datenlage ist allerdings nach wie vor unklar. Die klinisch-epidemiologischen Studien deuten aber darauf hin, dass Cannabiskonsum bei vulnerablen Personen schizophrenieforme Psychosen auslösen kann und einen ungünstigen Krankheitsverlauf zur Folge hat. </P><P> Das endogene Cannabinoid-System: Die vorliegende Arbeit gibt außerdem einen Überblick der Publikationen, die sich mit dem körpereigenen Cannabinoid- System und seinen endogenen Liganden im Hinblick auf psychotische Störungen beschäftigen.


Planta Medica ◽  
2010 ◽  
Vol 76 (05) ◽  
Author(s):  
S Chandra ◽  
H Lata ◽  
IA Khan ◽  
MA Elsohly
Keyword(s):  

Planta Medica ◽  
2011 ◽  
Vol 77 (05) ◽  
Author(s):  
S Chandra ◽  
H Lata ◽  
N Techen ◽  
IA Khan ◽  
MA ElSohly
Keyword(s):  

Planta Medica ◽  
2012 ◽  
Vol 78 (05) ◽  
Author(s):  
A Husni ◽  
S Ross ◽  
O Dale ◽  
C Gemelli ◽  
G Ma ◽  
...  

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