Conservation of diversity in bulk populations of barley (hordeum vulgare L.)

Jana, S.; Khangura, B. S.

doi:10.1007/bf00028584

Cited by 15 publications

(12 citation statements)

References 16 publications

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“…Generally, selection will reduce genetic diversity. On the other hand “the loss of genetic diversity in individual locations may be substantial, but the gain among populations in diverse locations may in fact cause an overall increase” (Jana and Khangura 1986) and sustain and develop adapted diversity for future generations.…”

Section: Discussionmentioning

confidence: 99%

“…Alef.) (Jana and Khangura, 1986) and wheat ( Triticum aestivum L.) (Goldringer et al, 1998) demonstrated the influence of location and management practices on population dynamics. Based on his experiences with barley, Suneson (1956) strongly suggested the use of long‐term natural selection as an “evolutionary plant breeding method.” Specific adaptation could not be tracked in these approaches because the comparison of provenances was done at only one location.…”

Section: Discussionmentioning

confidence: 99%

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Crop Adaptation in On‐Farm Management by Natural and Conscious Selection: A Case Study with Lentil

Horneburg

Becker

2008

Crop Science

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On‐farm management of landraces or older cultivars of crop plants is often recommended to combine conservation and use of genetic resources, but experimental studies on on‐farm management are hard to find, particularly in industrialized countries. To investigate whether on‐farm management results in regional adaptation and enhances crop biodiversity, an experiment with lentils (Lens culinaris Medik.) was designed. Lentil production has almost ceased to exist in central Europe, but lentils may still be found in gene banks and have remained a popular food. Three landraces were evaluated on three farms in Germany; at each farm, three populations evolved, based on three selection methods: (i) natural selection, (ii) visual mass selection, and (iii) selection for yield of single plant progenies. These selection methods were applied for two to four years. The nine populations developed for each landrace (three methods × three locations) were grown in a comparative trial on two of the farms. In most cases, populations selected at a specific location were at this location superior in yield to populations selected at other locations, indicating that on‐farm management can result in site‐specific adaptation. Significant changes in morphological and phenological traits occurred. For one landrace, natural selection increased seed weight. The response to different selection methods largely depended on landrace and selection site, and no method was generally superior. In conclusion, on‐farm management is a useful approach to maintain, use, and develop plant genetic resources. Natural selection as the most cost‐efficient method is recommended.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Crop Adaptation in On‐Farm Management by Natural and Conscious Selection: A Case Study with Lentil

Horneburg

Becker

2008

Crop Science

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“…This index was previously used to determine the range of variation in several crop species including wheat (JAIN et al 1975) andbarley (TOLBERT et al 1979;NEGASSA 1985;JANA and KHANGURA 1986;ENGELS 1994).…”

Section: Methodsmentioning

confidence: 99%

Phenotypic Diversity of Ethiopian Barleys in Relation to Geographical Regions, Altitudinal Range, and Agro-Ecological Zones: As an Aid to Germplasm Collection and Conservation Strategy

Demissie

Bjørnstad

2004

Hereditas

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DEMISSIE, A. and BIQRNSTAD, A. 1996. Phenotypic diversity of Ethiopian barleys in relation to geographical regions, altitudinal range, and agro-ecological zones: as an aid to germplasm collection and conservation strategy. -Hereditas 124: 17-29. Lund, Sweden. Data on 51 accessions of landrace barley from an Ethiopian collection were analyzed for variation of six morphological traits. Shannon-Weaver diversity indices ( H ) were calculated for traits, populations, geographical regions, altitude classes, and agro-ecological zones. Mean diversity (8') for Ethiopia was 0.71 f 0.09. Polymorphism was high for rachilla hair type (H' = 0.92) and aleurone color ( H = 0.90) andrelatively low for some traits, e.g., caryopsis type (H' = 0.29). The chi-square (x2) analysis displayed that some regions, such as Welega, Tigray, Gojam, had significant phenotypic differences for most traits. Analysis of vanance showed no significant differences either among regions (except aleurone color) or among altitude classes as well as among agro-ecological zones but attributed most of the variance to populations. A clinal pattern of variation was observed in rachilla hair type and row number with altitude, the latter also in relation to north-south direction. The highest mean diversity index ( H = 0.77 k 0.07) was recorded for areas ranging in altitude from 2000 to 2500 m. A decline in mean diversity with increasing elevation was also noted. Although no obvious patterns of diversity with respect to major agro-ecological zones were revealed, zones with fairly high estimates of variations ( H = 0 . 7 4 k 0.11) were identified. Principal components analyses showed that 28% of the variance was explained by black lemma/blue aleurone/black seed and white phenotype and further corroborated character correlations revealed by diversity indices. Based on the characters considered and populations evaluated, sites in Gonder/Tigray (representing the north), Welega (in the western), and Arsi (representing central and eastern regions), with due consideration to agro-ecological and altitudinal parameters, may serve as appropriate locations for in situ conservation.

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“…Homogeneous lines or clones can be monitored quickly for outcrossing with one or a few isozyme marker loci (Jain et al 1982;Ellstrand and Foster 1983;SchmidtStohn et al 1986;Miller et al 1989), but it is best to rely on multilocus analyses for highly heterogeneous populations. Assays of4 to 14 isozyme loci have documented outcrossing in heterogeneous populations of Apium L. (Orton and Artis 1984), Hordeum (Jana and Khangura 1986;Wagner and Allard 1991), Zea (Pollak et al 1984;Bijlsma et al 1986;Kahleretal.1984Kahleretal. , 1989, CucumisL.…”

Section: Gene Diversity Statistics Derived From Isozyme Data (A P Hmentioning

confidence: 99%

Genetic Markers and Plant Genetic Resource Management

Bretting

Widrlechner

1995

Plant Breeding Reviews

137

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Conservation of diversity in bulk populations of barley (hordeum vulgare L.)

Cited by 15 publications

References 16 publications

Crop Adaptation in On‐Farm Management by Natural and Conscious Selection: A Case Study with Lentil

Crop Adaptation in On‐Farm Management by Natural and Conscious Selection: A Case Study with Lentil

Phenotypic Diversity of Ethiopian Barleys in Relation to Geographical Regions, Altitudinal Range, and Agro-Ecological Zones: As an Aid to Germplasm Collection and Conservation Strategy

Genetic Markers and Plant Genetic Resource Management

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