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Showing 1 to 20 of 21 for “"cold hardiness"”.
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Cold hardiness studies of bermudagrass and Paspalum vaginatum Sw.
The relative cold hardiness of 8 bermudagrass Cynodon sp. and 2 Paspalum vaginatum Sw. cultivars was evaluated in growth chamber by dry weight of regrowth obtained from these turfgrasses. Samples of the turfgrasses which were cold stressed in the field were taken into the greenhouse at regular …
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Nutritional and PGR effects on lipid unsaturation, osmoregulant content, and relation to bermudagrass cold hardiness
… or induce winter dormancy while maintaining cold hardiness, applications of seaweed extract (SWE) (0.54 kg ha-1), ethephon (16 L ha-1), Fe (1 kg ha-1), and N (49 kg ha-1) took place every three weeks during the fall of 2001 and 2002. Cultivars examined included 'Riviera', 'Midiron', …
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Host influence on the cold hardiness of the emerald ash borer, *Agrilus planipennis* Fairmaire (Coleoptera: Buprestidae)
… The ability of an insect to withstand cold, or its cold hardiness, is important in limiting its northern distribution. The cold hardiness of A. planipennis from green ash and black ash was assessed using two laboratory measures, supercooling points and lower lethal temperature, in …
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Identification of clone x rootstock effects on cold hardiness and relevant dehydrins changes in Cabernet franc (Vitis vinifera L.)
Cold injury can harm grapevines and severely reduce yields in cool-climate regions. Previous studies indicate bud cold hardiness differences among Vitis vinifera cultivars, but comparatively, little attention has been given to the effect of clone and rootstock. This study investigates the bud cold …
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Demography, cold hardiness, and nutrient reserves of overwintering nests of the carpenter ant Camponotus pennsylvanicus (De Geer) (Hymenoptera: Formicidae)
Overwintering nests of C. pennsylvanicus were dissected and censused. All castes were assayed for glycerol and for changes in nutrient reserves. Spring queens were collected at swarming and allowed to initiate nests. Queens were analyzed for nutrient reserves during the early stages of nest …
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Purification and characterization of glutathione reductase isozymes specific for the state of cold hardiness of red spruce (Picea rubens sarg.)
Isozymes of glutathione reductase (GR) have been purified from red spruce. A major isozyme is present throughout the year, while one isozyme is present only during summer in non-hardened needles. A third isozyme is present only during winter in hardened needles. The isozymes present in non-hardened …
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Vegetative storage protein accumulation and physiological changes occurring within interior spruce seedlings
… the development of rest and the acquisition of cold hardiness. This trend was observed in bud extracts of three seedlots QL, EK, and PG as well as in the ambient treatment (natural fluctuations in photoperiod and temperature) of seedlot FIN. Stem and root tissue had similar accumulation …
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Partitioning of multivariate phenotypes using regression trees reveals complex patterns of adaptation to climate across the range of black cottonwood (Populus trichocarpa)
… Relative canopy depth, Bud set, Bud flush, cold index of injury, carbon isotope ratio) were measured in a range-wide sample of 124 P. trichocarpa genotypes grown in a common garden. Heritability's were moderate to high (0.24 to 0.55) and significant population differentiation (QST > 0.3) …
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Regulation of pyruvate kinase and glycerol-3-phosphate dehydrogenase in the freeze tolerant goldenrod gall fly: role in polyol cryoprotectant production
… solidaginis, can survive winter temperatures as cold as –55oC by using the freeze tolerance strategy of cold hardiness. This study examines pyruvate kinase (PK) and glycerol-3-phosphate dehydrogenase (G3PDH) that were purified from gall fly larvae acclimated to 5oC (control) and −15oC …
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The Use of Plant Growth Regulators to Improve the Traffic Tolerance and Repair of Overseeded Bermudagrass
… Patriot's aggressive growth and excellent cold hardiness are predicted to result in better overall traffic tolerance and repair as compared to Tifsport.
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Effects of photoperiod, temperature, and diet on the development of the banded woollybear, Pyrrharctia (Isia) isabella (J. E. Smith) (Lepidoptera: Arctiidae).
… larvae at 30°C were found not to be cold hardy. Increments in head capsule widths at each successive instar did not follow Dyar's rule. The relationships between voltinism and obligatory diapause, cold-hardiness and diapause, photoperiod, temperature and development, chilling and …
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Inferring rare bumble bee species occurrences from nontarget bumble bee assemblages
… in temperate climates thanks to their cold hardiness, ability to buzz pollinate, and generalist foraging tendencies, but many species are experiencing sharp declines. The endangered rusty patched bumble bee (Bombus affinis) is one such species, now occupying only 8% of its historical …
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Evaluation of tall fescue-zoysiagrass polystands and new zoysiagrass genotypes for use in the transition zone
… on zoysiagrass, and improved cultivars with good cold hardiness and large patch resistance are needed in the transition zone. Tall fescue (Schedonorus arundinaceus Schreb), a C3 grass, is used frequently in Kansas due to its heat and drought tolerance compared to some other C3 grasses. However, …
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Physiological and genetic mechanism(s) of cold acclimation in Rhododendron
An in vitro laboratory protocol for assessing cold hardiness (CH) in rhododendrons based on electrolyte-leakage was developed. The raw leakage data were transformed into percent-adjusted injury, which showed high correlation with injury data based on visual observations. The percent-adjusted injury …
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The effects of exogenous application of abscisic acid and α,α'-dipyridyl on cold acclimation and physical characteristics of Pisum sativum 'Alaska' seedlings
Cold acclimation entails changes in membrane composition, osmotic adjustment, alterations in the cell wall-plasma membrane interface, sugar deposition, and changes in cell wall proteins. There is evidence that a rigid cell wall may be necessary for cold acclimation. Difficulties arise in studying …
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Pre-release Evaluation of Laricobius osakensis Montgomery and Shiyake (Coleoptera: Derodontidae), a Potential Biological Control Agent for the Hemlock Woolly Adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), in the Eastern United States
… to survive, feed, develop, and reproduce in USDA cold-hardiness zones 5b and 6a of southwest Virginia. Behavior of L. osakensis and L. nigrinus was qualitatively similar but varied quantitatively. Laricobius osakensis was more active and had a lower association with T. canadensis. Interactions …
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Genomic Selection and Genome-Wide Association Study in Populus trichocarpa and Pinus taeda
… heritability for several adaptive traits (cold hardiness, dbh, bud flush, height, and bud set) in a population of Populus trichocarpa and for height, diameter, and stem straightness in Pinus taeda. GEBVs accuracies were estimated using a ridge regression–best linear unbiased prediction …
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Population biology and ecology and of Periplaneta americana (L.) in the urban environment
… in this species. Low foraging activity in the colder, winter months characterized an overwintering period of P. americana populations in the urban environment. Lipids were the principal metabolic reserve for overwintering cockroaches, and accounted for a 22% of dry body weight loss in females …
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Plasticity, Intraspecific Variability and Local Adaptation to Climatic Extreme Events of Ecotypes/Provenances of Key Plant Species
… Even in a generally warmer environment, cold extremes in winter or spring are expected still to prevail in the future. Therefore, the provenances of the selected species were tested for their cold-hardiness and late frost resistance (Manuscripts 5-7). Growth of the grassland species and …
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Genetic architecture, genecology and phenotypic plasticity in seed and seedling traits of yellow-cedar : (Chamaecyparis nootkatensis (D.Don) Spach)
… growth rate, phenology, drought resistance, cold acclimation, and dormancy. Significant variability was evident at both the population and family within population level in most traits measured. Substantially more genetic variability (2 to 16 times) was found at the family within population …
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