ࡱ> #` \bjbjmm .,  iiiiLiD ː0k0k0k0k0k l l l6888888$ӑh;\) tr l ltrtr\ 0k0k{{{trv 0k 0k6{tr6{{ {0k$k pOixB{" 0ː{,z{ { lmN{-o 9p; l l l\\zX l l lːtrtrtrtr 8B' B  Effect of Genotype and Environment on spring barley hordeins Gordana `IMI 1  Alojzije LALI 1 Josip KOVA EVI 1  Daniela HORVAT 1 Lidija LENART 2 1 Department for Cereal Breeding and Genetics, Agricultural Institute Osijek, Juzno predgradje 17, HR-31000 Osijek, Croatia 2 Faculty of Food Technology, J.J. Strossmayer University in Osijek, Franje Kuha a 6, HR-31000 Osijek, Croatia E-mail: gordana.simic@poljinos.hr Abstract: The genetic and environmental effects on total grain protein, malt extract and hordein fractions have been studied in four spring barley cultivars grown in field trials at Croatia. Barley grain hordeins were analyzed by RP-HPLC. A significant difference was observed among the cultivars in B, C and D hordein relative proportions, but there was no statistically significant difference between locations and years. Regarding protein content, malt extract and total hordein content, there were significant differences among years, but not among locations. There were also differences in malt extract content and total hordein content between cultivars. Grain protein content was highly significantly correlated with total hordein content, but there wasnt noticed grain protein influence on particular hordein fractions proportions. Keywords: spring barley, genotype, environment, hordeins, RP-HPLC Introduction It has been known that cereal protein content is genetically controlled, but significantly affected by the environmental conditions (Drezner et al., 2007; Lali et al., 2007; Varga et al., 2007). Malt quality highly depends on barley grain protein content and it is the hordeins, the major fraction of the endosperm storage proteins, which are mainly responsible for the negative correlation between malt extract yield and barley protein content, first reported by Bishop in the 1930s and reviewed by Molina-Cano et al. (2001). The hordeins are alcohol-extractable protein fraction of barley grain and, on average, account for up to 60% of the total grain nitrogen (Brennan et al., 1998). They are classified into four groups of polypeptides, called B, C, D and  hordeins, and are encoded by the genes: Hor 2 (B fraction), Hor 1 (C fraction), Hor 3 (D fraction) and Hor 5 ( fraction), located on barley chromosome 5(1H). The B hordein (sulphur-rich) and C hordein (sulphur-poor) are two main fractions, while D hordein (high molecular weight) and  hordein (sulphur-rich) are quantitatively minor components. When studying the effect of grain protein on the malting quality, Howard et al. (1996) found that variation in growth conditions resulted in a wide range of grain protein contents and malt extract values, as well as contents of the individual B, C and D hordeins in grains. Materials and methods Four spring barley cultivars (three domestic cultivars developed at Agricultural Institute Osijek Astor, Fran and Matej, and foreign Scarlett from Germany) were grown under field conditions on two localities Osijek (eutric cambisol, pHKCl=7.10) and Nova Gradiska (alluvial soil, pHKCl=5.90) during three growing seassons (2004-2006). The experiment was conducted in RCBD design in six replicates (area of basic plot was 7.56 m2). Prior to micromalting the barley samples were screened over a 2.5 mm sieve and analyzed for total barley protein content by non-destructive near infrared transmission method (Infratec 1241 Grain Analyzer). Malt extract content was determined according to the EBC official methods. Barley grain hordeins were analyzed by the reversed-phase high-performance liquid chromatography (RP-HPLC) following the procedure of Celus et al. (2006). Statistical analyses were carried out using the SAS 8e package. Results and discussion Results of grain protein content and malt extract content are presented in Table 1. In experiments carried out during three years and at two locations, there wasnt detected statistically significant difference in grain protein content among cultivars and locations. Similar values, however, for grain protein content were found in 2004 and 2005, but significantly higher than in 2006. Statistically justified differences in malt extract content were observed among cultivars and years, what accords with the finding of Lali et al. (2007). Cultivar Scarlett had significantly higher content of extract (81.32%), but similar to cultivars Fran (80.62%) and Matej (80.42%). Cultivar Astor resulted in significantly lower malt extract (79.77%). There was no statistically significant difference in extract content among locations. Table 1. Means for protein content and malt extract content YearProtein content (%)Malt extract content (%)Loc.AstorFranMatejScarlettMeanAstorFranMatejScarlettMean2004.13.4012.7513.3513.4513.24 a78.4079.8079.7079.9579.46 c 2005.13.6713.3413.5312.5213.26 a79.8080.5080.2081.9580.61 b 2006.11.0710.9510.8910.9610.96 b81.1081.5581.3582.0581.51 aLSD0.05 0.440.89Osijek12.7712.0712.3612.1112.3279.9781.1781.0381.8781.01N. Grad.12.6512.6212.8212.5112.6579.5780.0779.8080.7780.05LSD0.05 nsnsMean12.7112.3412.5812.3012.4979.77b80.62ab80.42ab81.32a80.53LSD0.05 ns1.02a...c - Duncan s Multiple Range Test at Pd"0.05 The results of determination of hordeins with RP-HPLC are presented in Table 2 and 3. In this study, level of the total hordein was expressed in arbitrary units (AU, based on chromatogram peak areas), and proportions of the various hordein fractions were quantified as percent of total peak area (Molina-Cano et al., 2001). The higher and statistically similar total hordein content was found in cultivars Matej (8386 AU) and Astor (8250 AU) in comparison to cultivars Fran (7358 AU) and Scarlett (7095 AU). Years 2004 and 2005 resulted in significant higher total hordein content when comparing to 2006, while location didnt have influence on total hordein content. However, cultivars showed significant differences regarding proportions of the B, C and D hordein, which confirms the results reported by Molina-Cano et al. (2001) and Qi at al. (2005). The highest proportion of B hordein had cultivar Fran (70.47%) and cultivar Matej had the smallest (53.88%). Regarding the proportion of C hordein, in contrast, cultivar Matej had the highest value (39.76%), and cultivar Fran had the smallest proportion of C hordein (24.27%). This data show no significant differences between the means of the hordein fraction proportions investigated, among different locations and years. The coefficients of correlation between grain protein content, malt extract content, total hordein content i hordein fraction proportions are given in Table 4. The positive and significant correlation was found between grain protein content and total hordein content, but we did not find significant relation between grain protein and proportions of hordein fractions. Total hordein content significantly negatively correlated with malt extract content, what is in accordance with our previous finding (`imi et al., 2007). Significant negative relationship was found between proportions of B hordein and C hordein fraction, whereas D hordein was positively correlated with C hordein and negatively with B hordein fraction. Table 2. Means for total hordeins and D hordein YearTotal hordeins (AU)D hordein (%)Loc.AstorFranMatejScarlettMeanAstorFranMatejScarlettMean2004.94027980917686978814a7.635.306.427.376.692005.89028255956273008505a6.835.186.336.886.302006.64465841642052885999b7.245.296.357.086.49LSD0.05 527nsOsijek833271187873722476376.945.226.426.906.37N. Grad.816875998899696679087.285.296.307.326.55LSD0.05 nsnsMean8250a7358b8386a7095b77727.11 a5.26 c6.36 b7.11 a6.46LSD0.05 6080.56 a...c - Duncan s Multiple Range Test at Pd"0.05 AU - arbitrary units Table 3. Means for C hordein and B hordein YearC hordein (%)B hordein (%)Loc.AstorFranMatejScarlettMeanAstorFranMatejScarlettMean2004.35.6125.1139.9432.6233.3257.1269.5853.6560.0060.092005.37.2423.5740.0031.5933.1055.9371.2553.6861.5360.602006.34.9624.1339.3431.4232.4657.8070.5854.3261.5161.05LSD0.05 nsnsOsijek36.3924.7839.3933.2133.4456.6769.9954.2059.8960.19N. Grad.35.4823.7640.1430.5432.4857.2470.9553.5662.1460.97LSD0.05 nsnsMean35.94b24.27d39.76a31.88c32.9656.95c70.47a53.88d61.01b60.58LSD0.05 2.182.32 a...d - Duncan s Multiple Range Test at Pd"0.05 Table 4. 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However, regarding proportions of particular hordein fractions, genotype effect was dominant. References Brennan C.S., Smith D.B., Harris N., Shewry P.R. 1998. The production and characterisation of Hor 3 null lines of barley provides new information on the relationship of D hordein to malting performance. Journal of Cereal Science, 28: 3. 291-299. Celus I., Brijs K., Delcour J.A. 2006. The effects of malting and mashing on barley protein extractability. Journal of Cereal Science, 44: 2. 203-211. Drezner G., Dvojkovi K., Horvat D., Novoselovi D., Lali A. 2007. Environmental impacts on wheat agronomic and quality traits. Cereal Research Communications, 35: 2. 357-360. Howard K.A., Gayler K.R., Eagles H.A., Halloran G.M. 1996. The relationship between D hordein and malting quality in barley. Journal of Cereal Science, 24: 1. 47-53. Lali A., Kova evi J., `imi G., Drezner G., Guberac V. Environmental effects on grain yield and malting quality parameters of winter barley. Cereal Research Communic5) $$Ifa$gdnkdV$$IfTl֞ XND` t44 laytnT$$Ifa$gdn#).$$Ifa$gdn $$Ifa$gdn./2346;E99999 $$Ifa$gdnkdW$$IfTl֞ XND` t44 laytnT;@FG5kdVX$$IfTl֞ XND` t44 laytnT$$Ifa$gdnGJKLMOV^$$Ifa$gdn$$If]`a$gdn$0$IfYD]`a$gdn$0$IfYDa$gdn^_bcdeE3333$0$IfYDa$gdnkdY$$IfTl֞ XND` t44 laytnTefhp$$Ifa$gdn$$If]^a$gdn$0$IfYD]^a$gdnpqtuvwE3333$0$IfYDa$gdnkdY$$IfTl֞ XND` t44 laytnTwxy{$$Ifa$gdn$$If]^a$gdn$0$IfYD]^a$gdn{| (3E;;61gdngdn $a$gdnkdZ$$IfTl֞ XND` t44 laytnT$BP3<=>$&'56BH xثګ<>@BDZ\ʾ߳ʾʾ߱߾ߥߚߚ߂߳~huh @[hn5CJaJh~hn5CJaJh BhnCJaJhwhn5CJaJUh#2shnCJaJhdhn5CJaJhn5CJaJh,7hn6CJaJhnCJaJ h,hn hj&hnhn h)hn+3>6Ήb%4ܫXZ\$^`a$gdngdn ations, 35: 2. 709-712. Molina-Cano J.L., Polo J.P., Romera E., Araus J.L., Zarco J., Swanston J.S. 2001. Relationship between barley hordeins and malting quality in a mutant of cv. Triumph I. Genotype by environment interaction of hordein content. Journal of Cereal Science, 34: 3. 285-294. Qi J.C., Chen J.X., Wang J.M., Wu F.B., Cao L.P., Zhang G.P. 2005. Protein and hordein fraction content in barley seeds as affected by sowing date and their relations to malting quality. Jornal of Zhejiang University Science, 6B: 11. 1069-1075. `imi G., Sudar R., Lali A., Jurkovi Z., Horvat D., Babi D. 2007. Relationship between hordein proteins and malt quality in barley cultivars grown in Croatia. Cereal Research Communications, 35: 3. 1487-1496. Varga B., Sve njak Z., Jurkovi Z., Pospiail M. 2007. Quality responses of winter wheat cultivars to nitrogen and fungicide applications in Croatia. 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