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Highly Significant Negative Correlation (highly + significant_negative_correlation)
Selected AbstractsSuspended dust over southeastern Mediterranean and its relation to atmospheric circulationsINTERNATIONAL JOURNAL OF CLIMATOLOGY, Issue 7 2008Uri Dayan Abstract The Middle East deserts are often subjected to dust, which reduces horizontal visibility to 5 km, and sometimes even to < 1 km. The present study examines the annual and inter-annual occurrences of dust events based on 37 years of visibility observations from Hazerim (near Beer Sheba) correlated with PM10 dust concentration. The visibility data was converted to PM10 dust concentration, using concurrent data for three years. We then analyse the linkage between dust and synoptic- to global-scale weather systems. The monthly data indicate that the dust season starts in October and ends in May, with a maximum in March. More than 89% of the total annual dust is accumulated between December and May, the ,high dust season'. The annual totals vary as much as an order of magnitude from year to year. The synoptic system that produces the majority of the dust over the northern Negev is the Cyprus Low, contributing 2/3 of both the total yearly dust yield and of the number of dust observations. This suggests that a positive relationship exists between the dust in the Negev and rainfall in north Israel, both of which are generated by Cyprus Lows. Indeed, a significant (at 0.05 level) correlation of + 0.30 was found between the two. Correlation maps evidence that in dust-rich years the cyclonic activity over the Mediterranean is abnormally high and in poor-dust years it is low. A highly significant negative correlation (,0.66) was found between the dust yield and the intensity of the North Atlantic oscillation (NAO), which modulates the cyclonic activity over Europe and the northern Mediterranean. This may also imply that periods in which more dust accumulated as loess in the northern Negev may indicate the existence of negative NAO phase, and concurrently, warmer conditions over the Sahara, colder conditions over Europe and enhanced rainfall over the Mediterranean Basin. Copyright © 2007 Royal Meteorological Society [source] BAKING PERFORMANCE OF 1BL/1RS SOFT RED WINTER WHEATSJOURNAL OF FOOD QUALITY, Issue 2 2001WILLIAM E. BARBEAU ABSTRACT Baking performance of nine 1BL/1RS soft red winter wheat (SRWW) lines and six non-1BL/1RS lines was assessed during two crop years, 1995,96 and 1996,97, and at two locations, Blacksburg and Warsaw, Virginia. The 1BL/1RS flours produced cookies with significantly smaller diameters than non-1BL/1RS flours (p , 0.0026) across both growing years and locations. There was a highly significant negative correlation (r =,0.709) between cookie spread and alkaline water retention capacity (AWRC) of SRWW flours. Overall, there was no significant difference (p = 0.2552) in biscuit volume of 1BL/1RS and non-1BL/1RS flours. There were no significant differences in cake volumes of 1BL/1RS and non-1BL/1RS flours when data from both years and locations were combined, p = 0.0710; or when Blacksburg and Warsaw locations were considered separately, p = 0.2009 and 0.1882, respectively. Finally, there were no significant differences in the texture of cakes made from 1BL/1RS and non-1BL/1RS flours regardless of growing year or location. These results suggest that the 1BL/1RS translocation significantly reduces the cookie spread of SRWW flours but has no significant impact on biscuit or cake quality. [source] Salt-resistant and salt-sensitive wheat genotypes show similar biochemical reaction at protein level in the first phase of salt stressJOURNAL OF PLANT NUTRITION AND SOIL SCIENCE, Issue 4 2006Muhammad Saqib Abstract Salinity has a two-phase effect on plant growth, an osmotic effect due to salts in the outside solution and ion toxicity in a second phase due to salt build-up in transpiring leaves. To elucidate salt-resistance mechanisms in the first phase of salt stress, we studied the biochemical reaction of salt-resistant and salt-sensitive wheat (Triticum aestivum L.) genotypes at protein level after 10 d exposure to 125 mM,NaCl salinity (first phase of salt stress) and the variation of salt resistance among the genotypes after 30 d exposure to 125 mM,NaCl salinity (second phase of salt stress) in solution culture experiments in a growth chamber. The three genotypes differed significantly in absolute and relative shoot and root dry weights after 30 d exposure to NaCl salinity. SARC-1 produced the maximum and 7-Cerros the minimum shoot dry weights under salinity relative to control. A highly significant negative correlation (r2 = ,0.99) was observed between salt resistance (% shoot dry weight under salinity relative to control) and shoot Na+ concentration of the wheat genotypes studied. However, the salt-resistant and salt-sensitive genotypes showed a similar biochemical reaction at the level of proteins after 10 d exposure to 125 mM NaCl. In both genotypes, the expression of more than 50% proteins was changed, but the difference between the genotypes in various categories of protein change (up-regulated, down-regulated, disappeared, and new-appeared) was only 1%,8%. It is concluded that the initial biochemical reaction to salinity at protein level in wheat is an unspecific response and not a specific adaptation to salinity. [source] Carbon isotope discrimination: potential for screening salinity tolerance in rice at the seedling stage using hydroponicsPLANT BREEDING, Issue 3 2005R. Shaheen Abstract Rice is a moderately salt-sensitive crop species and soil salinity is the single most widespread soil toxicity problem lacing rice production. The quantification of salinity resistance poses serious problems in the field because of climatic factors and field heterogeneity. In the present study. rice germplasm obtained from the International Rice Research Institute (IRRI). Philippines, was screened in a naturally lit (11 h daylight) glasshouse-based hydroponics unit at two salinity levels (4 and 6 dS/m), Phenotypic performance based on survival of tolerant, moderately tolerant and susceptible isogenic lines along with tolerant and susceptible parents was evaluated after 10 and 13 days of salt stress. Plants were harvested after second scoring and carbon isotope discrimination in the leaves (A) was measured. ,1 ranged from 19.5 to 22.9%, A highly significant negative correlation (r =,0.95. P < 0.001) between , and visual scoring was observed. Data indicated the potential of using , as a physiological indicator for salinity tolerance in rice seedlings grown in hydroponics. [source] | ||||||||||