The results of frost resistance assessment of sweet cherry varieties in an early winter period

Paraquat was sprayed at sub-lethal doses on young clover plants. It decreased leaf isoflavone concentrations by more than 30 per cent. This response was not associated with the defoliating effect of paraquat. The relevance of the finding to grazed pastures is discussed. We argue that our results may be extrapolated to the autumn-early winter period, but not to spring.

Download Full-text

Fruit bearing shoot characteristics of apricot and sweet cherry cultivars in Hungary

International Journal of Horticultural Science ◽

10.31421/ijhs/12/2/641 ◽

2006 ◽

Vol 12 (2) ◽

Cited By ~ 2

Author(s):

S. Thurzó ◽

G. Drén ◽

M. Dani ◽

B. Hlevnjak ◽

V. Hazic ◽

...

Keyword(s):

Frost Resistance ◽

Sweet Cherry ◽

Shoot Length ◽

Flower Buds ◽

Flower Bud ◽

Medium Length ◽

Large Numbers ◽

Fruit Setting ◽

Different Types ◽

Sweet Cherry Cultivars

: Our study was carried out on 23 apricot and 9 sweet cherry cultivars in February 2005. Fruiting laterals were classified into four groups (0-10 cm, 10-20 cm, 20-40 cm and >40 cm) and then the density and setting of flower buds were evaluated and expressed as bud/cm. The flower bud density of four types of fruit bearing shoots and the changes in the frost resistance were studied. Shoots were collected from a young orchard in Gone (apricot), Siófok (sweet cherry) and Nagykutas (sweet cherry). There were significant differences among the cultivars in the density of flower buds. The number of flower buds/cm shoot length ranged between 0.91 and 2.20 in the average of the different fruit bearing shoot types on apricot. Based on the results, the bud density of shorter shoots is generally higher on apricot, but this is not valid for all cultivars. For cvs. Magyarkajszi and Ceglédi bíborkajszi, the highest flower bud density was detected on shoots of medium length (10-40 cm). There were fivefold and almost twofold (1.85) differences in bud density among cultivars on shoots shorter than 10 cm length and longer than 40 cm length, respectively. The ratio of the bud densities of the different types of shoots also ranged between wide boundaries. For cvs. Bayoto, Toyesi and Toyiba this ratio was 2.5-3.5, while for cv. Magyarkajszi it was 1.3. In the average of fruit bearing shoots on sweet cherry, cv. Bigarreau Burlat (1.10 bud/cm) and cv. Germersdorfi 45 (0.61 bud/cm) had the largest and the lowest flower bud density, respectively. Among the fruit bearing shoots, the largest flower bud density was in the group of 0-10 cm fruiting laterals. Among cultivars, cv. Bigarreau Burlat had the largest bud density. In the groups of n- i 0 cm, 10-20 cm, 20-30 cm and 30-40 cm fruiting laterals, the lowest flower bud density was for cv. Linda, cv. Germersdorfi 45, cv. Ferrovia and cv. Sunburst, respectively. On cvs. Van and Bigarreau Burlat, large numbers of double-set flower buds were observed on the fruit bearing shoots longer than 20 cm. Fruit setting differed on the different types of fruit bearing shoots, with the lowest value measured on above 40 cm shoots. The highest fruit setting was observed on cv. Katalin, while the lowest value was measured on cv. Germersdorfi 3.

Download Full-text

Estimation of the frost resistance of the strawberry

Biological Communications ◽

10.21638/spbu03.2020.402 ◽

2020 ◽

Vol 65 (4) ◽

Author(s):

Zoya Ozherelieva ◽

Pavel Prudnikov ◽

Marina Zubkova

Keyword(s):

Frost Resistance ◽

Fractional Composition ◽

Bound Water ◽

Free Water ◽

Early Winter ◽

Total Water ◽

Biochemical Indicators ◽

High Level ◽

Physiological And Biochemical ◽

Minimum Air Temperature

As a result of the experiment, it was found that an increase in bound water and a decrease in free water in the leaves in the autumn are characteristic of strawberry plants against the background of a decrease in the level of total water content. The maximum ratio of bound water to free water based on the accumulation of sucrose and the amino acid proline was established in such varieties as ‘Solovushka’, ‘Tsaritsa’, ‘Sara’ and ‘Korona’. A high level of correlation was noted between the minimum air temperature and physiological and biochemical indicators of the formation of frost resistance of strawberries. A high correlation was established between the degree of freezing tolerance of strawberry plants and the fractional composition of water at the beginning of winter. In the early winter, the frost-resistant strawberry varieties ‘Solovushka’, ‘Rosinka’, ‘Tsaritsa’, ‘Korona’ and ‘Sara’ were characterized. The ability to stably maintain frost resistance during the winter thaw was shown by the varieties ‘Solovushka’, ‘Tsaritsa’ and ‘Korona’. As a result of the studies, frost-resistant strawberry varieties — ‘Solovushka’, ‘Tsaritsa’ and ‘Korona’ — were isolated.

Download Full-text

A GRAPE VARIETIES RESISTANCE TO LOW WINTER TEMPERATURES

Vestnik of the Russian agricultural science ◽

10.30850/vrsn/2021/5/18-21 ◽

1970 ◽

pp. 18-21

Author(s):

N. I. Nen'ko ◽

G. K. Kiseleva ◽

I. A. Il'ina ◽

N. M. Zaporozhets ◽

V. V. Sokolova

Keyword(s):

Low Temperatures ◽

Frost Resistance ◽

Geographical Origin ◽

Selection Process ◽

Soluble Sugars ◽

Water Soluble ◽

Winter Period ◽

Winter Temperatures ◽

Grape Varieties ◽

Adaptive Reaction

In the conditions of frequently repeated in recent years, temperature fluctuations in the Anao-Taman zone of the Krasnodar region, where the main areas of grape plantings are concentrated, the resistance issues of grapes to low temperatures of the winter period are particularly relevant, since sharp differences in the air temperature in the autumn-winter period contribute to the decrease in winter resistance Grape vines. The article presents the results of the assessment of physiological biochemical changes, which are a fundamental adaptive reaction of plants associated with the frost resistance of grapes of various ecological and geographical origin: Dostoyny, Krasnostop, Kristall, Vostorg, Aligote, Zarif. As a result of research in grape varieties, Krasnostop, Crystal, Vostorg was revealed to maximize kidney hydrogen decreased (by 11.7-15.3%) and increased accumulation of water-soluble sugars (at 2.67-3.29 times) in comparison with other studied varieties, What speaks of their larger resistance to low temperatures. The variety of the Vostorg was discovered an increase in the content of proline by 40.5 times, indicating its active participation in the formation of a protective response to low temperatures. In all studied grape varieties have a closer connection between the kidney hydrogen and the content of soluble sugars in the core than with the content of the proline. Of all varieties, the waters of the grape vines, the content of soluble sugars and proline, the varieties of the Krasnostop, Crystal, Vostorg are allocated as the most resistant to low temperatures in the conditions of the Anao Taman zone of the Krasnodar Territory, which makes it possible to conclude the possibility of their use in the selection process in quality sources of frost resistance.

Download Full-text

High-Performance Repair Mortars for Application in Severe Weathering Environments: Frost Resistance Assessment

Historic Mortars ◽

10.1007/978-3-319-91606-4_12 ◽

2018 ◽

pp. 155-168

Author(s):

Dana Křivánková ◽

Cristiana Lara Nunes ◽

Zuzana Slížková ◽

Dita Frankeová ◽

Krzysztof Niedoba

Keyword(s):

Frost Resistance ◽

High Performance ◽

Resistance Assessment ◽

Repair Mortars

Download Full-text

STUDY OF PINE STRAWBERRY FROST RESISTANCE BY ARTIFICIAL FREEZING METHOD

Vestnik of the Russian agricultural science ◽

10.30850/vrsn/2019/6/26-28 ◽

1970 ◽

pp. 26-28

Author(s):

Z E. Ozherelyeva ◽

M. I. Zubkova ◽

D. A. Krivushina

Keyword(s):

Frost Resistance ◽

Geographical Origin ◽

Storage Conditions ◽

Winter Hardiness ◽

Winter Period ◽

Irreversible Damage ◽

Apical Buds ◽

Russian Research Institute ◽

Artificial Freezing ◽

Main Components

The study of the frost resistance was carried out in 2017–2019 on the basis of the Laboratory of Physiology of Fruit Plant Resistance, Russian Research Institute for Fruit Crop Breeding. Strawberry cultivars of different ecological and geographical origin (‘Kokinskaya Rannia’, ‘Rosinka’, ‘Solovushka’, ‘Tzaritza’, ‘Urozhaynaya TzGL’ – Russia; ‘Sara’ – Sweden; ‘Alba’, ‘Marmolada’ – Italy; ‘Korona’, ‘Sonata’ – Holland) were used as experimental material. The frosts resistance of strawberry varieties was studied in the laboratory conditions was used by artificial freezing. A model of strawberry plant selection was developed to determine the main components of winter hardiness. On the basis of preparation of plant samples for modeling of damaging factors of the winter period, storage conditions of experimental plants were developed. Plant hardening and modeling of damaging factors of the winter period were carried out with the additional modification for strawberries. As a result of the artificial freezing, the damage to the tissues of rhizome and apical buds of shoots of strawberry varieties of different ecological and geographical origin were evaluated in early winter period and during thaws in winter. It was determined that the decrease in the temperature to -15°C at the end of November did not cause irreversible damage to the strawberry varieties. The decrease in the temperature to -20°C in early December increased the damage to the studied strawberry varieties. During the winter it was determined that the strawberry response to the thaw increased by the end of the winter period. The decrease in frost resistance is primarily due to the resumption of growth processes under the influence of positive temperatures. As a result of determining the components of winter hardiness, the varieties Solovushaka, Tzaritza (Russia), Sara (Sweden) and Korona (Holland) showed the greatest potential of frost resistance.

Download Full-text

Characteristics of Early-Winter Caribou, Rangifer tarandus caribou, Feeding Sites in the Southern Purcell Mountains, British Columbia

The Canadian Field-Naturalist ◽

10.22621/cfn.v117i3.737 ◽

2003 ◽

Vol 117 (3) ◽

pp. 352 ◽

Cited By ~ 5

Author(s):

Trevor A. Kinley ◽

John Bergenske ◽

Julie-Anne Davies ◽

David Quinn

Keyword(s):

British Columbia ◽

Rangifer Tarandus ◽

Winter Season ◽

Subalpine Forest ◽

Winter Period ◽

Late Winter ◽

Abies Lasiocarpa ◽

Rangifer Tarandus Caribou ◽

Early Winter ◽

Winter Habitat

Mountain Caribou are a rare ecotype of Woodland Caribou (Rangifer tarandus caribou) inhabiting the high-snowfall region of southeastern British Columbia, and are defined by their late-winter reliance on arboreal hair lichen of the genus Bryoria. During early winter, there is considerable variation in habitat use among populations. We snow-trailed Caribou in the southern Purcell Mountains during early winter to determine foraging patterns for the Purcell population. When snow was ≤51 cm deep, Caribou fed on Grouseberry (Vaccinium scoparium), the terrestrial lichen Cladonia, and arboreal lichens of the genus Bryoria. When snow was ≥62 cm deep, they ate exclusively arboreal lichens. In both periods, Caribou ate arboreal lichen from essentially every downed tree or branch encountered and fed with a higher intensity at downed trees than standing trees. During the low-snow period, Caribou fed at fewer trees but used those with greater lichen abundance, and fed more intensively at each, compared to the deep-snow period. In comparison to trees occurring on the foraging path but at which Caribou did not feed, those from which arboreal lichen was foraged intensively were of larger diameter, had greater lichen abundance, and were more likely to be Subalpine Fir (Abies lasiocarpa) or Engelmann Spruce (Picea engelmannii) and less likely to be Whitebark Pine (Pinus albicaulis), Lodgepole Pine (P. contorta) or Alpine Larch (Larix lyalli). The shift in diet between the low-snow and deep-snow periods reflected two modes of foraging within the early winter period, distinct from one another and apparently also distinct from the late-winter season. Management for early-winter habitat will require retention of some commercially significant forest across extensive areas, both near the subalpine forest – subalpine parkland ecotone and lower in the subalpine forest.

Download Full-text

A preliminary report on the use of FAMACHAÂ© for haemonchosis in goats in the Eastern Cape Province of South Africa during the late autumn / early winter period : short communication

Journal of the South African Veterinary Association ◽

10.4102/jsava.v78i2.296 ◽

2007 ◽

Vol 78 (2) ◽

Author(s):

C. Sri Jeyakumar

Keyword(s):

South Africa ◽

Preliminary Report ◽

Short Communication ◽

Winter Period ◽

Eastern Cape Province ◽

Early Winter ◽

Eastern Cape ◽

Late Autumn ◽

Resource Poor ◽

Study Sites

From May to July 2005 a study was conducted on the prevalence and effects of haemonchosis in goats farmed on communal grazing belonging to resource-poor farmers at two study sites, namely Mlungisi (26Â°53'E, 31Â°53'S) and Ezibeleni (26Â°58'E, 31Â°53'S), situated within the Chris Hani District Municipality in Eastern Cape Province of South Africa. The usefulness of the FAMACHAÂ© system for identifying goats needing treatment was confirmed. It allowed stock owners to identify badly affected goats accurately, as borne out by the agreement between FAMACHA scores and corresponding haematocrits.

Download Full-text