Several studies document lengthening of the frost-free season within the conterminous United States (U.S.) over the past century, and report trends in spring and fall frost timing that could stem from hemispheric warming. In the absence of warming, theory and case studies link anomalous frost timing to atmospheric circulation anomalies. However, recent efforts to relate a century of observed ch...

This report provides a brief review of key findings related to frost resistance in alpine woody plant species, summarizes data on their frost resistance, highlights the importance of freeze avoidance mechanisms, and indicates areas of future research. Freezing temperatures are possible throughout the whole growing period in the alpine life zone. Frost severity, comprised of both intensity and d...

late spring frost usually damages flowers and reduces yield of almond trees. due to natural sexual reproduction, in most of almond orchards of qazvin province, iran, which have been established through seedling propagation, a vast genetic variation has been occurred. this situation has been provided many possibilities to study different traits of native almond genotypes, to select superior geno...

An earlier onset of photosynthesis in spring for boreal forest trees is predicted as the climate warms, yet the importance of soil vs air temperatures for spring recovery remains to be determined. Effects of various soil- and air-temperature conditions on spring recovery of photosynthesis in Scots pine (Pinus sylvestris) seedlings were assessed under controlled environmental conditions. Using w...

BACKGROUND AND AIMS Frost tolerance of wheat depends primarily upon a strong vernalization requirement, delaying the transition to the reproductive phase. The aim of the present study was to learn how saturation of the vernalization requirement and apical development stage are related to frost tolerance in wheat. METHODS 'Mironovskaya 808', a winter variety with a long vernalization requireme...

Brown flatsedge (Cyperus fuscus) is widely distributed in Europe, Asia, the Indian subcontinent, and the Mediterranean region of Northern Africa. It was apparently introduced into North America in the late 1800s and has steadily moved southward and westward. Brown flatsedge is reported new to Arkansas and Mississippi herewith. Field observations from early spring until frost were made between 2...

Evaluating genetic diversity in walnut (Juglans regia L.) populations is a rapid approach used by breeding programs to distinguish superior genotypes. The present study was conducted on the population of Hamedan Province, one richest and most genetically diverse regions Iran, during 2018–2019. After initial screening, 47 genotypes were selected for further evaluation pomological phenological tr...

One of the reasons limiting apricot expansion in world is short period winter dormancy plants and rapid development generative buds spring. Apricot flower often die even after small spring return frosts that limit commercial culture this fruit crop. The aim investigation was to study collection-breeding plantations select frost-resistant genotypes have promise for breeding use. To solve problem...

Container-grown seedlings of red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.) and yellow birch (Betula alleghaniensis Britton) in their first year of growth were overwintered outdoors. Tolerance of roots and stems to freezing was compared from late summer to the following spring. Mitotic activity in the apical bud was related more closely to air temperature than to bud dormancy a...

mashhad plain is one of the most important regions of apple cultivated areas. occurring spring late frost creates a lot of damages on bud and decreasing the yield of apple in this region. assessment and risk modeling of frost damage would be useful to manage and decrease the damage. the study area is a part of khorasan razavi province which is located in mashhad plain. this region is located in...