scholarly journals Propagação vegetativa de Juniperus chinensis

2015 ◽  
Vol 6 (3) ◽  
pp. 307 ◽  
Author(s):  
Rosimeri De Oliveira Fragoso ◽  
Katia Christina Zuffellato-Ribas ◽  
Gustavo Macanhão ◽  
Carlos André Stuepp ◽  
Henrique Soares Koehler
Keyword(s):  
Sexual Reproduction ◽  
Vegetative Propagation ◽  
The Other ◽  
Stock Plant ◽  
Indolebutyric Acid ◽  
Synthetic Auxin ◽  
Juniperus Chinensis ◽  
Propagation Technique ◽  
Growth Habits

Juniperus chinensis L. var. kaizuka, belonging to the Cupressaceae family and known as kaizuka is a species widely used in landscaping, being different from the other varieties of the species mainly because of its tortuous growth habits. The sexual reproduction of Juniperus chinensis has disadvantages and its propagation by cuttings can facilitate the production of seedlings. Thus, this study aimed to evaluate the effect of three different concentrations of the synthetic auxin indolebutyric acid (0, 1500 and 3000 mg L-1) to promote rooting of Juniperus chinensis var. kaizuka, collected in the basal (0.5 to 2.0 m), middle (2.1 to 3.5 m) and apical (3.6 to 5.0 m) portions of the stock plant, during winter, spring and autumn of 2012, with the intent to subsidize the development of a propagation protocol for the species. After 140 days in the greenhouse, it was observed that choosing the proper season to collect cuttings is essential for the viability of vegetative propagation technique for Juniperus chinensis var. kaizuka, with the recommendation of spring as the more suitable season for rooting development. However, although the application of AIB and the collection height in the stock plant have shown significant effects on some variables, it wasn’t observed a standard, related to these factors, producing a greater induction of the radicial system of the species.

Ex vitro vegetative propagation technique for sustainable utilization of Hypoxis hemerocallidea corms

2021 ◽  
Vol 139 ◽  
pp. 294-299
Author(s):  
Motiki M. Mofokeng ◽  
Hintsa T. Araya ◽  
S.O. Amoo ◽  
C.P. du Plooy ◽  
P.W. Mashela
Keyword(s):  
Vegetative Propagation ◽  
Sustainable Utilization ◽  
Ex Vitro ◽  
Propagation Technique ◽  
Hypoxis Hemerocallidea

A novel fast-vegetative propagation technique of the pioneer shrub Baccharis linearis on mine tailings by adding compost

2021 ◽  
pp. 1-9
Author(s):  
Rosanna Ginocchio ◽  
Luz María de la Fuente ◽  
Fabiola Orrego ◽  
María José Díaz ◽  
Javiera Báez ◽  
...  
Keyword(s):  
Mine Tailings ◽  
Vegetative Propagation ◽  
Baccharis Linearis ◽  
Propagation Technique

scholarly journals Influence of cutting type and size on rooting of Lavandula dentata L

2012 ◽  
Vol 14 (1) ◽  
pp. 8-11 ◽  
Author(s):  
C.M. Bona ◽  
I.R. Biasetto ◽  
M. Masetto ◽  
C. Deschamps ◽  
L.A. Biasi
Keyword(s):  
Essential Oil ◽  
Vegetative Propagation ◽  
Plant Material ◽  
The Other ◽  
Root Weight ◽  
Root Number ◽  
Polystyrene Foam ◽  
High Quality ◽  
Cutting Propagation ◽  
Superior Clones

Even though the Lavandula species may be propagated by seeds, it should not be the preferred propagation method because it causes a great lack of uniformity. On the other hand, asexually propagated lavender crops would provide more homogeneous crops, and clones from high quality plant material would increase the odds for obtaining a higher quality essential oil. However, problems such as poor rooting and restrict market availability for superior clones have been a problem in vegetative propagation of the Lavandula species. The objective of this work was to define which type and size of cutting is more adequate for cutting propagation of L. dentata, a very productive Lavandula species. Cuttings with 5, 8, 10 or 13 cm and from the apical or basal parts of stems cut from L. dentata stock plants were placed in Plantmax HT® filled polystyrene foam trays and kept under intermittent mist system for two months. Averages of root number, length of the longest root, fresh and dry root weight, and percentage of rooting were evaluated. Apical cuttings combined 97.9% rooting with an average of 13.2 roots per cutting and basal cuttings 93.7% rooting with 2.98 roots per cutting. Apical cuttings with at least 10 cm in length were considered the most adequate for cutting propagation of L. dentata.

A Vegetative Propagation System for Tamarack

1986 ◽  
Vol 3 (3) ◽  
pp. 91-93 ◽  
Author(s):  
Robert E. Farmer ◽  
Heather A. Foster ◽  
Olenka Bakowsky ◽  
Brian MacDonald ◽  
Gwenoth O'Reilly ◽  
...  
Keyword(s):  
Vegetative Propagation ◽  
Shoot Growth ◽  
Indolebutyric Acid ◽  
Rooted Cuttings ◽  
Normal Shoot ◽  
Rooting Of Cuttings ◽  
Natural Stands ◽  
North Western

Abstract Greenwood cuttings from greenhouse-produced tamarack seedlings and 3- to 10-year-old tamarack wildlings transplanted from natural stands in north-western Ontario were rooted under mist in peat-vermiculite. Eighty-five percent of cuttings from seedlings rooted; treatment with indolebutyric acid increased number of roots per cutting, but not rooting percent. At 6 weeks after planting, rooting of cuttings from wildlings averaged 66%, and at 12 weeks, 91%. Twelve-week rooting percent of cuttings from individual ortets ranged from 12 to 100, but cuttings from the majority of ortets exhibited 100% rooting. Nearly all rooted cuttings survived overwintering outdoors and initiated normal shoot growth after forcing in mid-winter. The described propagation system is recommended for production of container stock for tamarack plantations. North. J. Appl. For. 3:91-93, Sept. 1986.

VEGETATIVE PROPAGATION OF CONIFERS: VI. HORMONE SOLUTION AND DUST TREATMENTS OF SPRUCE CUTTINGS PROPAGATED IN GREENHOUSE AND OUTSIDE FRAMES

1940 ◽  
Vol 18c (8) ◽  
pp. 401-414 ◽  
Author(s):  
N. H. Grace ◽  
J. L. Farrar
Keyword(s):  
Beneficial Effect ◽  
Norway Spruce ◽  
Vegetative Propagation ◽  
Acid Treatment ◽  
Black Spruce ◽  
Cane Sugar ◽  
The Other ◽  
Acid Solutions ◽  
Organic Mercury ◽  
Indolylacetic Acid

Four monthly collections of dormant Norway spruce cuttings, January to April, were treated with indolylbutyric acid solutions and propagated in sand in a greenhouse. February and April collections gave better rooting than those of the other two months, while there was appreciably greater mortality of the March and April collections. The results with short cuttings were uniformly superior to those obtained with long cuttings. Other cuttings of the April collection were propagated outside. The short cuttings responded more favourably to outside conditions, while the long cuttings gave equally poor results inside and outside. Indolylbutyric acid treatment had no beneficial effect and was followed by reduced rooting and increased mortality at concentrations from 20 to 60 p.p.m.Results of a late March collection of Norway, white, and black spruce cuttings treated with talc dusts containing indolylacetic acid, cane sugar, and organic mercury, indicated that Norway spruce rooted more readily than the two other species. Treatment failed to have a beneficial effect, although injury from indolylacetic acid was somewhat reduced by its combination with organic mercury.The results of these and the other experiments reported indicate that short Norway spruce cuttings over the period from January to April root to the extent of about 50%. A May collection, an early June collection with new growth on the cuttings, and a late June collection in which the cuttings were made from new growth only, gave inappreciable rooting. Similar new-growth cuttings did, however, give some rooting when propagated in sand watered with nutrient salts.

La différence sexuelle chez les Grecs

1998 ◽  
pp. 75-82
Author(s):  
Vigdis Songe-Møller
Keyword(s):  
Sexual Reproduction ◽  
Sexual Difference ◽  
Human Existence ◽  
The Other ◽  
Ancient Greek ◽  
Human Vulnerability ◽  
Greek Thought ◽  
Self Sufficiency ◽  
European Thought ◽  
Platonic Tradition

I want to look at two contrasting ways of seeing the relation between the sexes within ancient Greek thought by dividing Greek thought into two main traditions: the Platonic tradition from Parmenides through Plato to Aristotle, and what one might call 'the tragic tradition' including thinkers such as Anaximander, Heraclitus, and Empedocles. The Platonic tradition is characterized by hierarchical thinking in which the norm is unity, harmony and self-sufficiency. In Plato, this turns out to be the norm also for human existence, with the result that there is no room in his philosophy for thinking of sexual difference and sexual reproduction. When, on the other hand, conflicts, discord, and human vulnerability towards misfortune and death are looked upon as the constitutive elements of life-as with the tragic poets-sexual difference also plays an important part. When human existence is treated as something radically different from divinity, the Greek thinkers-in this paper exemplified by Empedocles and the tragic poets-tend to look upon sexual difference as a constitutive element in human existence. For the philosophers in this tradition, all being is constituted by two oppositional elements which do not form a hierarchy but rather an inimical antagonism. Misogyny is perhaps as strong in this 'tragic' tradition as it is in the Platonic-Aristotelian one. However, even if the former tradition has at least provided some space for thinking of sexual difference, it has not been very influential in western, European thought.

scholarly journals Creeping Bellflower Response to Glyphosate and Synthetic Auxin Herbicides

2018 ◽  
Vol 28 (1) ◽  
pp. 6-9
Author(s):  
Carl W. Coburn ◽  
Albert T. Adjesiwor ◽  
Andrew R. Kniss
Keyword(s):  
The Other ◽  
Residential Areas ◽  
Synthetic Auxin ◽  
Auxin Herbicides ◽  
Postemergence Herbicides ◽  
Biomass Reduction

Creeping bellflower (Campanula rapunculoides) is a difficult to manage weed commonly found in turfgrass and residential areas. We evaluated the efficacy of selected postemergence herbicides (glyphosate, dicamba, clopyralid, quinclorac, and triclopyr) on greenhouse-grown creeping bellflower. The experiment was conducted in Jan. 2016 and repeated in Sept. 2016. Each herbicide was applied at five rates plus a nontreated control. Clopyralid caused greater creeping bellflower biomass reduction and mortality than the other herbicides investigated. The herbicide dose required to cause 50% mortality was lowest for clopyralid [86–138 g·ha−1 acid equivalent (a.e.)] compared with dicamba (221–536 g·ha−1 a.e.), glyphosate (196–678 g·ha−1 a.e.), triclopyr (236–782 g·ha−1 a.e.), and quinclorac (>3000 g·ha−1 a.e.). Clopyralid could be an effective herbicide for managing creeping bellflower, although it is currently not registered for use in many habitats where this plant is a problematic weed.

Evidence for sexual reproduction in the red algae Palmaria palmata and Halosaccion ramentaceum

1979 ◽  
Vol 57 (21) ◽  
pp. 2452-2459 ◽  
Author(s):  
J. P. van der Meer ◽  
L. C-M. Chen
Keyword(s):  
Life History ◽  
Sexual Reproduction ◽  
Red Algae ◽  
Second Generation ◽  
Nuclear Division ◽  
The Other ◽  
Palmaria Palmata

Plants believed to be female gametophytes of Palmaria palmata and Halosaccion ramentaceum have been discovered in culture. Tetraspores of diploid tetrasporophytes gave rise to two types of haploid sporelings, one of which grew much more robustly and was less branched than the other. A 1:1 ratio of the two types was obtained from random spores and a 2:2 segregation occurred within individual meiotic tetrads. The more robust plants proved to be males which matured relatively quickly and produced abundant spermatangia. The smaller plants, those believed to be females, grew much more slowly and eventually formed sporangia. However, these aborted without releasing viable spores. Nuclear division within the sporangia appeared to be a haploid meiosis. Fertile tetrasporic fronds of P. palmata were obtained from gametophytes in culture on one occasion, and these gave rise to a second generation of segregating sporelings. A life history for P. palmata and H. ramentaceum roughly comparable to that of Liagora tetrasporifera is suggested by the results.

VEGETATIVE PROPAGATION OF WILD OATS, AVENA FATUA, AND OTHER ECONOMICALLY IMPORTANT SPECIES OF AVENEAE AND HORDEAE

1932 ◽  
Vol 7 (2) ◽  
pp. 204-220 ◽  
Author(s):  
L. E. Kirk ◽  
T. K. Pavlychenko
Keyword(s):  
Vegetative Propagation ◽  
Ground Level ◽  
The Other ◽  
Considerable Proportion ◽  
Important Species ◽  
Wild Oats ◽  
The Difference ◽  
The One ◽  
Favorable Conditions ◽  
Nodal Tissue

Following the discovery that small sections of wild oats seedlings could become rerooted and develop into normal plants, a study was undertaken to determine from what part or parts of the seedlings new growth can originate, and whether cultivated oats, wheat, barley and spring rye, would behave in a similar manner. Special attention was given to the problem of vegetative propagation in wild oats as a factor in the control of this weed.Small sections of wild oats seedlings, one inch in length and containing the coleoptile node, became rerooted under favorable conditions and produced fully developed plants. Cultivated oats behaved in a similar manner to wild oats in this respect, but the latter produced the more vigorous growth.When land is infested with wild oats and is plowed shallow, or cultivated shortly after the seedlings have emerged from the soil, a considerable proportion of them, under certain conditions, may produce new plants by vegetative regrowth. The extent to which this may occur in the field depends largely on the soil moisture as well as on other conditions which facilitate rerooting, such as shallow plowing, and packing when conditions for plant growth are favorable.With young seedlings of wild oats at time of emergence, regrowth occurred mostly from a small area located between ground level and one inch below the surface. The same was found to be true of cultivated oats. With seedlings of wheat, barley and spring rye, at time of emergence, regrowth originated only from nodal tissue close to the seed. The difference in this respect, between oats, Aveneae, on the one hand, and wheat, barley and rye, Hordeae, on the other, is due to the fact that the area of elongation in oats is the mesocotyl, whereas in other cereals it is the first internode.At later stages in seedling development of both oats and the other cereals, nodes which were capable of regrowth developed immediately below and above the ground level. With older seedlings in the first-, second-, and third-leaf stage, the youngest node above ground, which is the one nearest the soil, had the greatest power of regrowth.

Mating Behaviour of Australian Isolates of Phytophthora Species. I. Inter- and Intraspecific Mating

1978 ◽  
Vol 26 (2) ◽  
pp. 123 ◽  
Author(s):  
CJ Shepherd
Keyword(s):  
Sexual Reproduction ◽  
Papua New Guinea ◽  
Sexual Behaviour ◽  
Mating Behaviour ◽  
Phytophthora Species ◽  
The Other ◽  
Detailed Report ◽  
Mating Patterns ◽  
Phytophthora Drechsleri ◽  
New Britain

This paper presents the first detailed report on the mating behaviour of isolates of Phytophthora drechsleri, P. cinnamomi, P. parasitica, P. palmivora, P. cryptogea and P. cambivora from Australia, Papua New Guinea and New Britain. In all, 97 isolates of Australasian origin and four isolates of American origin were examined. Matings between species produced fewer oogonia and more aborted oogonia than occurred in intraspecific matings. Isolates differed in their abilities to form oogonia in interspecific matings. Unlike the other species examined, P. drechsleri isolates were unable to form oogonia and oospores in many of the intraspecific matings attempted. In general, the mating patterns of P. Cryptogea isolates were similar to those of P. drechsleri, which supports the conclusion that these taxa are conspecific. Isolates of P. parasitica mated freely in intraspecific pairings but showed some restrictions in interspecific matings, with aborted oogonia frequently being produced. The behaviour of single- zoospore derivatives from seven P.parasitica isolates that exhibited irregular sexual behaviour during culture showed that three of the field isolates were heterocaryotic, carrying both homothallic and A1 type nuclei. Both homogenic and heterogenic incompatibility mechanisms may be operative as barriers to free sexual reproduction. The present study indicates that determinations of mating competence are of little taxonomic value.

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