frost tolerance of winter wheat depends primarily on a strong vernalization requirement, delaying the transition to reproductive phase. the responses of four bread wheat cultivars (triticum aestivum l.) to low-temperatures were examined in controlled environment and field conditions. prolonged cold treatment accelerated the transition to reproductive development in winter wheats (cv. norstar an...

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...

The timing of life history traits is central to lifetime fitness and nowhere is this more evident or well studied as in the phenology of flowering in governing plant reproductive success. Recent changes in the timing of environmental events attributable to climate change, such as the date of snowmelt at high altitudes, which initiates the growing season, have had important repercussions for som...

The core crop region of the Humid Pampa is one most productive agricultural lands around world and depends highly on climate conditions. This study assesses variability, extremes, observed projected changes there, using 1911–2019 observations CMIP5 model simulations. Since 1970, annual mean temperature has risen by 1 °C minimum maximum temperatures 2 0.5 °C, respectively. frequency warm days ni...

To study effects of salicylic acid (SA) treatments (0, 0.5, 1 and 2 mM) in two forms of seed priming (for 24 h) and spraying on seedling at 4-6 leaf stage an experiment was conducted on periwinkle (Catharanthus roseus Don.) with and without exposure to a mild cold stress of 8 °C (for 32 h). Seeds were sown in trays containing peat-based substrate (with 20% sandy loam field soil). Transplants of...

An examination of five temperature and five precipitation extreme indicators reveals an increase in both temperature and precipitation extremes over the 1926–2000 period in the northeast United States, with most of this increase occurring over the past four decades. Empirical orthogonal function (EOF) analysis of winter frost days (FD) and warm nights (TN90) and also winter consecutive dry days...

This study presents an updated assessment of the projected climate change over Greece in near future (2021–2050) and at end 21st century (2071–2100) (EOC), relative to reference period 1971–2000, focusing on seasonal crop-specific climatic indices. The indices include days (d) with: a maximum daily near-surface temperature (TASMAX) > 30 °C Spring, TASMAX 35 Summer (hot days), minimum (TASMIN...

cardiovascular disease is the leading reason of morbidity in older people. coronary artery bypass graft (cabg) surgery is the most common type of operations in world. this study was designed to characterize comparison of early clinical outcome following on pump vs. off pump in patients over 70 years old with triple vessels disease and severe left ventricle dysfunction. 80 patients were divided ...