Assessment of pasta making quality parameters in Ethiopian durum wheat (Triticum turgidum L. var. durum) genotypes Mohammed Abinasa, Geremew Bultosa and Amsalu Ayana Wheat for Food Security in Africa Conference October 8-12, 2012 United Nations Conference Center, Addis Ababa, Ethiopia
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Assessment of pasta making quality parameters in Ethiopian durum wheat (Triticum turgidum L. var. durum)
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Assessment of pasta making quality parameters in Ethiopian durum wheat (Triticum turgidum L. var. durum) genotypes
Mohammed Abinasa, Geremew Bultosa and Amsalu Ayana
Wheat for Food Security in Africa Conference
October 8-12, 2012 United Nations Conference Center,
Addis Ababa, Ethiopia
Outline
Introduction
Materials and Methods Quality Analysis Statistical Analyses
Results and Discussion
Variations, heritability and genetic advance Genotype performance for quality parameters Correlation and path coefficient analysis
Conclusions
Wheat (Triticum spp.) is the most important cereal cultivated in Ethiopia.
Ethiopia is the largest wheat producing country in sub-Saharan Africa and the third largest in Africa after Egypt and Algeria (FAOSTAT, 2010). Both bread and durum wheats are produced in Ethiopia.
Durum wheats have been under cultivation in Ethiopia since ancient times. Various researchers (Simane, et al., 1993; Messele, 2001) reported the uniqueness of the Ethiopian tetraploid wheat germplasm for different useful traits. Durum wheat is best adapted to regions having a relatively dry climate, with hot days and cool nights during the growing season, typical of Mediterranean and temperate climates.
Introduction
Introduction…
Bale highlands of Southeastern Ethiopia are some of the regions which are highly suitable for durum wheat production.
Compositional and physical grain attributes distinguish durum wheat from bread wheat and make it suitable to produce high quality products such as pasta, semolina and cuscous.
The acceptability of durum wheat varieties is greatly influenced by its quality characteristics as it is an important aspect of durum wheat.
Introduction
Main durum wheat quality requirements are: Large vitreous grains
Test weight
Thousand kernel weight
High grain protein content
Strong gluten
High yellow pigment content
Low lipoxygenase activity
Protein content and type in the grain of durum wheat is important for human nutrition and end use processing quality.
In addition, high protein determines premium prices for wheat in many regions of the world.
Introduction
Quality improvement in wheat is possible through evaluation and selection, whenever wide variation exists in breeding material (Peterson et al., 1998).
Response to selection for quality depends on the heritability, genetic advance of quality traits and correlated response with other characteristics.
The genetic progress achievable through breeding is largely dependent on the identification of genotypes with better
quality attributes and of critical traits on which selection can be based (Ammar, et al., 2000).
Introduction
In Ethiopia research on durum wheat improvement since its beginning until recently has focused mainly on improving grain yield and disease resistance (Tarekegn, et al., 1995; Letta et al., 2008; Abebe, et al., 2008).
With the expansion of agro industries, good processing quality durum wheat has become increasingly important for variety release.
On the other hand, limited work has been done on determining quality requirements of Ethiopian durum wheat genotypes used for pasta and other products.
Objectives
To evaluate durum wheat genotypes for quality parameters related to pasta making.
To analyze traits associations and examine the direct and indirect contribution of traits to the association by applying path analysis.
Materials and Methods
Sixteen durum wheat genotypes were included in the study.
13 are released varieties and
3 are advanced durum wheat breeding lines.
The genotypes were grown under rainfed during 2009 main (bona) crop growing season at Sinana and Adaba, Southeastern Ethiopia highlands.
Design: RCB,
Replication: 3, 1 m apart
Plot area : 2.5m long, 12 rows with 20cm apart
Seed rate: 150kg/ha, 90g/6m2
Fertilizer rate: 41/46kg/ha
No. Genotypes Pedigrees and/selection history Year of
14 CDSS94 CANGRUS/POHO-1//SUGU-14CDSS94Y00597T- A-1M-0Y-0B-1Y-0B Advanced line SARC
15 CD86772 Cocorit-71/DUKEM/DON87 CD86772-DZ491 Advanced line SARC
16 CD1B2620 KUCK CD1B2620-G-8M-030Y-030M-2Y-0-2Y-0B Advanced line SARC
Table1. Description of durum wheat genotypes studied
SARC: Sinana Agricultural Research Center, OARI: Oromia Agricultural Research Institute, DZARC: Debre Zeit Agricultural Research Center, EIAR: Ethiopian Institute of Agricultural Research
SN Location
(s)
Soil type Rainfall Altitude
(masl)
Global
position Amount(mm) pattern
1 Sinana clay in textural type
with slightly acidic
pH
700-1030 bimodal 2400 70N and 400E
2 Adaba chromic and pelvic
vertisols and dystric
and humic cambisols
600-750 monomodal 2365 7.10N and 39.40E
Table2. Descriptions of the test environments
Quality Analysis
Random homogenous sample of each harvested genotypes was used for laboratory analysis AACC, 2000.
Test weight
Thousand kernel weights
Kernel vitreousity ICC standard number 129 (ICC, 2000).
Grain hardness
Grain nitrogen content
Materials and Methods…
Wet gluten content
Dry gluten content
Gluten index (GI)
Yellow pigment content
SDS Sedimentation volume
Alveograph parameters (W, P)
Materials and Methods…
Statistical analysis
Sofware used:
SAS: ANOVA, Correlation, variance components
MINITAB: Homogeneity test
GENRES3: Path analysis
Materials and Methods…
100var
)(var traittheofvalueMean
iancephenotypicPCViationoftcoefficienPhenotypic
100var
)(var traittheofvalueMean
ianceGenotypicGCViationoftcoefficienGenotypic
100var
var)( 2
iancePhenotypic
ianceGenotypichtyHeritabili B
100var
)(% 2 traittheofvalueMean
iancephenotypichKmeanadvanceGenetic B
K= selection intensity (5% = 2.06), h2B= broad- sense heritability
Materials and Methods…
Results and Discussion
The Pooled analysis of variance revealed highly significant difference (p < 0.01) among genotypes for all quality parameters studied (Table 3).
Yellow pigment content, alveograph dough strength alveograph elasticity and thousand kernel weight showed higher PCV and GCV values (>10%), indicating less environmental influence on the expression of these traits.
Similarly, yellow pigment content, thousand kernel weight and alveograph strength W test weight showed intermediate to high heritability values coupled with high expected genetic as percent of mean.
Parameters TKW TW V GH GPC WGC DGC GI SDS YPC W P P/L
Table3. Estimates of statistical and genetical parameters of 13 quality traits in sixteen durum wheat genotypes from combined analysis of variance
**, *: significant at 0.01 and 0.05 probability levels respectively, ns: non significant,, MSg :genotypes mean Square, MSr(l) : replication within location mean square, MSl : location mean square, , MSgxl : genotype by location
interaction mean square, PCV: phenotypic coefficient of variation, GCV; genotypic coefficient of variation, h2(B) : broad sense heritability, GA (%mean): genetic advance as percent of mean TKW: Thousand kernel weight, TW: Test weight, V: Vitreousity, GH: grain hardness, GPC: grain protein content, WGC: wet gluten content, DGC: dry gluten content, GI: gluten index, SDS: sodium Dodecyl sulfate, YPC: yellow pigment
content, W: Alveograph strength, P:elasticity, P/L: elasticity/ extensibility ratio
Results and Discussion…
Genotype performance for quality parameters
Mean performance values of the studied genotypes for different quality parameters are given in Table 4.
Grain protein content of the studied genotypes ranged from 10.7% (CDSS94) to 13.2% (Leliso). The study also showed variations in gluten strength W, ranging from 64.3x10-4J (Gerardo) to 187.6x10-4J (Hitosa).
Table 4. Mean values of sixteen durum wheat genotypes for different quality parameters
Results and Discussion… Correlation and path coefficient analysis
Genetic relationship of traits may result from pleotropic effects of a gene, linkage of two genes, linkage disequilibrium and epistatic effects of different genes or due to the environmental influences.
The genotypic correlation coefficients showed significant association among some traits (Table 5).
Thousand kernel weight (rg = 0.55*), wet gluten content (rg = 0.86**) and dry gluten content (rg = 0.85**) revealed significant positive association with grain protein content. SDS sedimentation volume (rg=-0.49*) showed negative and significant correlation with protein content.
Dry gluten content (0.65) and thousand kernel weight (0.26) had the highest positive direct effect and significant genotypic correlation with grain protein content (Table 6).
These traits are important as selection criteria for the improvement of grain protein content in durum wheat.
Parameters TKW TW V GH GPC WGC DGC GI SDS YPC W P P/ L
*,* *: significant at 0.05 and 0.01 probability levels respectively
Table 5. Estimates of genotypic correlation coefficients among 13 quality parameters in durum wheat
genotypes
Parameters TKW WGC DGC SDS
rg
TKW 0.26 0.05 0.21 0.03 0.55*
WGC 0.13 0.09 0.60 0.04 0.86**
DGC 0.09 0.09 0.65 0.02 0.85**
SDS -0.11 -0.05 -0.26 -0.07 -0.49*
Residual effect =0.44 TKW: thousand kernel weight (g), WGC: wet gluten content (%), DGC: dry gluten content (%), SDS: sedimentation volume (ml), *, **: significant at 0.05 and 0.01 probability levels respectively, r
g: genotypic correlation coefficient of traits with grain protein content
Table 6. Estimates of genotypic path coefficient of direct (bold diagonal) and indirect effects of 4 quality parameters on grain protein content for durum wheat genotypes
Conclusions
The present study depicted the presence considerable variations among durum wheat genotypes for all quality parameters tested which gives an opportunity to plant breeders for the improvement these traits.
Genetic correlation coefficient analysis indicated that important quality parameters are positively correlated with grain protein content.
This suggests a common genetic basis among these traits.
Hence, simultaneous improvement of these traits would be possible.
Conclusions
Path coefficient analysis revealed that dry gluten content and thousand kernel weight showed the highest positive direct effect and significant positive correlation with grain protein content.
All the studied genotypes except Gerardo, Oda and Cocorit-71 were superior across most quality traits and could be good donor sources in durum wheat breeding programs.
Future Research
The need for multi-environment trial (combinations of locations and years)