Assessment of glutenin and phenotypic diversity of Syrian durum wheat landraces in relation to their geographical origin

Hintum, T.J.L. van; Elings, A.

doi:10.1007/bf00021241

Cited by 25 publications

(18 citation statements)

References 15 publications

(19 reference statements)

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“…The normalised values were used in the analysis of variance of diversity for individual characters, and hierarchical analysis of variance pooled over characters. The Shannon-Weaver diversity index has been widely used in studies of germplasm collections (e.g., TESFAYE et al 1991; VAN HINTUM and ELINGS 1991;ENGELS 1994). The interpretation is that the greater the number of variants in each phenotypic class of a given character and the more nearly equal their proportions, the greater is the diversity (PIELOU 1966).…”

Section: Methodsmentioning

confidence: 99%

Phenotypic diversity of tetraploid wheat landraces from northern and north-central regions of Ethiopia

et al. 2004

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Twenty-seven tetraploid (2n = 4x = 28) wheat (Triticum turgidum L.) landrace populations consisting of 2876 entries collected from the north and north-central administrative regions of Ethiopia were studied for variation of eleven phenotypic characters that have two or more classes. Using the frequencies of each phenotypic class within a character, the Shannon-Weaver index (H') was employed to estimate and analyse the diversity on the basis of four regions and five altitudinal gradients. Most traits were polymorphic. However, monomorphism was common in many of the populations for dense spike, long beak, and glabrous glume. On character basis, seed colour, seed shape, and glume pubescence contributed the highest mean diversity indices (H' = 0.99, 0.96, and 0.88, respectively). Spike density contributed the lowest index (H' = 0.24). However, it was the only trait that displayed significant dimerences ( p < 0.01) among regions, lax-spike types being frequent only in Gojam region. Significant differences ( p < 0.05) among altitude groups were detected only for glume colour and beak length. Much of the variance was among populations within region and within altitude group. For the overall characters, significant differences ( p < 0.01) were revealed only among populations within region and altitude group, but not among regions or altitude groups. However, the highest mean diversity indices were obtained in Tigray region (H' = 0.70). and in the altitude range between 2401 and 2600 m.a.s.1. (H' = 0.68). No clear association was detected between overall phenotypic diversity and altitude. The overall index (H' = 0.70) for the north and north-central regions of this country is of the same magnitude as that of previously reported regions. Therefore, before any collection mission is undertaken, we suggest further studies to gain information on the interrelationships among morphological diversity, variation for biochemical markers, and ecogeographical variables.

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Section: Methodsmentioning

confidence: 99%

Phenotypic diversity of tetraploid wheat landraces from northern and north-central regions of Ethiopia

et al. 2004

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“…The results from various studies have shown that the three loci coding for HMW glutenin subunits are highly polymorphic in nature and their expression is strictly under genetic control without the influence of environment. Considering these properties, allelic variation at the three loci coding for HMW glutenin subunits has been used either independently or in combination with other genetic markers to estimate the genetic variation in different wheat species (Nevo & Payne, 1987;Margiotta et al, 1988;Felsenburg et al, 1991 ;van-Hintum & Elings, 1991;Ciaffi et al_, 1993). Wheat is the most important food crop of Pakistan.…”

Section: Introductionmentioning

confidence: 99%

Assessment of genetic variability in hexaploid wheat landraces of Pakistan based on polymorphism for HMW glutenin subunits

Tahir

Turchetta

Anwar³

et al. 1996

Genet Resour Crop Evol

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Sixty hexaploid wheat landraces collected from five regions of Pakistan were assessed for genetic variability in terms of high molecular weight (HMW) glutenin subunits as revealed by SDS-PAGE. The germplasm appeared to be diverse and unique on the basis of HMW glutenin subunit compositions_ Out of 24 alleles detected at all the Glu-1 loci, four belonged to Glu-Al, 12 to Glu-B1 and eight to Glu-D1 locus. The number of novel HMW glutenin subunits detected were 1,4 and 6 at the three loci (Glu-A1, Glu-Bl, Glu-D1), respectively. The frequency distribution patterns of 24 allelic variants detected at the three Glu-1 loci in 1080 samples analysed for 60 accessions were determined both on the basis of individual accessions and on the basis of regions (accessions pooled across the regions). One allele ("null") at the Glu-A1 locus, three alleles (17 + 18, 7 + 8, 14) at the Glu-B1 locus and, two alleles (2 + 12 and 2** + 1U) at the Glu-D1 locus were found most frequently distributed in the 60 populations. Maximum variation was observed in the Baluchistan and Gilgit regions of Pakistan in terms of distribution of novel Glu-1 alleles. A higher gene diversity was observed between the populations as compared to the gene diversity within the populations while, a reverse pattern of gene diversity was observed when populations were pooled across the regions (higher within the regions than between the regions). A data base has been generated in this study which could be expanded and usefully exploited for cultivar development or management of gene bank accessions.

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“…A cluster analysis is an efficient mathematical method, which makes possible to study diversity among landraces using all available data (Zeven and Schachl 1989, Jaradat 1992, Zeven and Hintum 1992. Significant variability of landraces and old cultivars can be caused by their origin, then through climate, geographical and other conditions of the regions of origin (Hintum and Elings 1991). Wang and Guo (1992) found similarity in gluten alleles in accordance with geographical origin.…”

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confidence: 99%

Earliness, spike productivity and protein content in European winter wheat landraces and obsolete cultivars

Dotlačil¹,

Hermuth²,

Stehno³

2003

PLANT SOIL ENVIRON

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European winter wheat landraces and obsolete cultivars (121 accessions in set I and 101 accessions in set II) with modern check cultivars were evaluated in three-year field trials. Increased spike productivity in modern cultivars could be attributed mainly to increased number of grains in spikelet and increased HI, whereas TGW has marginal effect. Old cultivars had on average by 2-3% higher crude protein content in grain than modern ones. Among selected 10 characters, relatively wide diversity (C.V. 11-20%) has been estimated in spike length and characters of spike productivity (except of grain weight with C.V. close to 9%). It was difficult to distinguish the cultivars according to the country of origin, however, earliness and lower spike productivity seems to be characteristic for South-East origin whereas cultivars from NorthWest Europe showed opposite characters. Correlation analyses showed close relations between earliness in heading and in maturity and negative relation between late heading and grain filling period, which was positively correlated with TGW and HI (r = 0.26 to 0.38). Number of grains in spikelets was highly correlated with spike productivity and HI (r = 0.62 to 0.69) whereas relations between these two characters and TGW were lower (r = 0.20 to 0.51). Spike productivity characters, except of TGW, are in negative correlation with crude protein content in grain (r = -0.34 to -0.50). Regression analyses confirmed that main determining character for the spike productivity is number of kernels in spikelet (about 40% of variation) while effects of TGW are about half-size. Crude protein content was positively affected by plant height (15-30% of variation) impact of grain weight per spike was lower (14-17% of variation) and negative. Potentially valuable donors of earliness and longer grain filling period were identified for further studies and/or utilization in breeding programs. As especially valuable character can be considered very high crude protein content (around 18% in cvs Bergland, Ukrajinka, Sippbachzeller, Innichen Nr. 25001 and Barbu du Finistre). High crude protein content combined with relatively good spike productivity and/or long grain filling period or earliness was found in cvs Visperterminen 640 E, Hatvan, Szekacz 1242, Berchtesgardener Vogel, Ble du Lot and Barbu du Finistere.

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Assessment of glutenin and phenotypic diversity of Syrian durum wheat landraces in relation to their geographical origin

Cited by 25 publications

References 15 publications

Phenotypic diversity of tetraploid wheat landraces from northern and north-central regions of Ethiopia

Phenotypic diversity of tetraploid wheat landraces from northern and north-central regions of Ethiopia

Assessment of genetic variability in hexaploid wheat landraces of Pakistan based on polymorphism for HMW glutenin subunits

Earliness, spike productivity and protein content in European winter wheat landraces and obsolete cultivars

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