Development of a fertile genetic bridge between Trifolium ambiguum M. Bieb.  and T. repens L.

Hussain, S. W.; Williams, W. M.

doi:10.1007/s001220050612

Cited by 22 publications

(21 citation statements)

References 10 publications

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“…Kazimierska () and Taylor () reported possibility of overcoming incompatibility by embryo rescue. Utilizing this technique, interspecific hybrids have been developed between T. pratense × T. sarosiense (Collins, Taylor, & Phillips, ; Phillips, Collins, & Taylor, ); T. pratense × T. medium (Merker, ; Nedbalkova, Repkova, & Bartosova, ; Sawai, Ueda, Gau, & Uchiyama, ); T. pratense × T. alpestre (Merker, ; Phillips, Grosser, Berger, Taylor, & Collins, ); T. pratense × T. ambiguum (Vogt & Schweiger, ); T. ambiguum × T. hybridum (Evans, ); T. ambiguum with T. montanum and T. occidentale ; T. isthmocarpum with T. repens and T. nigrescens ; a trispecific cross T. repens × T. uniflorum × T. occidentale with T. ambiguum (Ferguson, Rupert, & Evans, ); T. repens × T. nigrescens (Hussain & Williams, ); T. ambiguum × T. repens (Meredith, Michaelson‐Yeats, Ougham, & Thomas, ; Williams & Verry, ; Yamada, Fukuoka, & Higuchi, ); and T. pratense × T. diffusum (Schwer & Cleveland, ). Yamada and Fukuoka (), Pandey, Grant, and Williams () and Sawai, Yamaguchi, and Uchiyama () have also utilized embryo culture for developing interspecific hybrids involving various Trifolium species.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, these species have close affinity with T. alexandrinum . Fertile interspecific hybrids of T. repens have also been reported with T. nigrescens, T. ambiguum and T. occidentale (Brewbaker & Keim, ; Hussain & Williams, , ; Marshal, Michaelson‐Yeates, Aluka, & Meredith, ; Williams, Plummer, & Phung, ). Only in some cases, interspecific crosses are reported to be sterile; for example, hybrids developed between a synthetic autotetraploid red clover and the diploid T. pallidum (Armstrong & Cleveland, ) and between T. pratense and T. diffusum (Schwer & Cleveland, ).…”

Section: Discussionmentioning

confidence: 99%

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Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage ofTrifolium alexandrinum(Egyptian clover)—important tropical forage legume

et al. 2018

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Genetic improvement of Trifolium alexandrinum L. is hampered because of narrow genetic base and lack of interspecies compatibility information. The study was envisaged to understand the interspecies incompatibility and the affinity between T. alexandrinum and 22 species of the genus representing different sections and to develop interspecific crosses. Development of interspecific hybrids with T. resupinatum, T. lappaceum, T. subterraneum, T. vesiculosum and T. echinatum, through embryo rescue, revealed their affinity with T. alexandrinum. Failure of pollen germination or restricted pollen tube growth showed its distant relatedness with T. clypeatum, T. balansae, T. purpureum, T. leucanthum, T. hirtum, T. pilulare and T. hybridum. Pollen tubes reached up to ovule among the crosses with T. alpestre, T. repens and T. nigrescens, whereas it travelled up to ovary among the crosses with T. angustifolium, T. grandiflorum and T. dasyurum indicating need of manipulation to overcome barrier. Thus, incompatibility of T. alexandrinum with many Trifolium species could be overcome through embryo rescue with intensive crossing. Egyptian clover ecotype ‘Fahli’ was more compatible with other species than ‘Mescavi’.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage ofTrifolium alexandrinum(Egyptian clover)—important tropical forage legume

et al. 2018

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“…The octoploid plant was backcrossed with white clover to produce first backcross (BC1F 1 ) populations which were hexaploid (2n = 6x = 48) with four haploid genomes from white clover and two from caucasian clover (Fig. 1;anderson et al 1991b;Hussain & Williams 1997). The BC 1 plants could be back-crossed repeatedly with white clover to produce BC 2 , BC 3 , etc.…”

Section: Introductionmentioning

confidence: 99%

Development of a breeding strategy for interspecific hybrids between Caucasian clover and white clover

Williams

Hussain

2008

New Zealand Journal of Agricultural Research

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A single 8× F 1 hybrid between Caucasian clover (T. ambiguum) and white clover (T. repens) was backcrossed to seven white clover plants to generate fertile 6× BC 1 families. To determine the most useful combination of desired traits of both parental species, and to develop a breeding strategy for this population, subsequent generations were produced in various ways. Self-pollination and intercrossing among BC 1 F 1 families produced F 2 , and later, F 3 and F 4 generations. Second, third and fourth backcrosses to white clover produced BC 2 , BC 3 and BC 4 generations. All generations were compared with the parental species in a single experiment grown in sand. Expression of the desired belowground traits of Caucasian clover was best in the BC 1 generation. By contrast, the best expression of the desired above-ground white clover traits was shown by the BC 2 F 1 generation. However, the BC 2 F 1 was pentaploid and did not stably transmit its desirable features to subsequent generations. On the other hand, advancement in the BC 1 from F 1 to F 4 revealed significant positive variation in most of the important traits and suggested that selection would be successful. A breeding strategy was developed based on the genetically stable BC 1 generation, advancing to BC 1 F 6 by selecting for increases in shoot dry matter (DM), stolon numbers, stolon growth, improved nodal rooting radius, larger numbers of flowers and high fertility and seed-set.

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“…is an annual, nonstoloniferous clover, native to Turkey, Iraq, Iran, Armenia, Cyprus, the Caucasus region, and the Mediterranean countries of Europe and North Africa (Zohary & Heller 1984;Gillet 1985). In New Zealand, T. nigrescens is being investigated for its potential as germplasm for the improvement of T. repens through interspecific hybridisation (Hussain & Williams 1997). Zohary (1970) recognised and documented two subspecies of T. nigrescens-ssp.…”

Section: Introductionmentioning

confidence: 99%

Symbiotic relationship betweenRhizobium leguminosarumbiovartrifoliiand Trifolium nigrescens

Pryor

Lowther

2002

New Zealand Journal of Agricultural Research

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Recommended strains of rhizobia for Trifolium repens and T. subterraneum, and rhizobia isolated from T. angustifolium and T. pratense root nodules, were used to inoculate seven accessions of T. nigrescens and their own macrosymbiont host plants growing in N-free media. When inoculated with the strain of rhizobia recommended for T. subterraneum, foliage weights of six of the seven T. nigrescens accessions were either the highest, or not significantly less than the highest. This supports the inclusion of T. nigrescens in the T. subterraneum group when grouping species which respond similarly symbiotically. The response of foliage weights of T. subterraneum and T. repens plants to inoculation with the strain of rhizobia isolated from T. angustifolium was similar to that following inoculation with the recommended strain for T. repens, rather than with the recommended strain for T. subterraneum. This result indicates that T. angustifolium should be included in the T. repens group when grouping species which respond similarly in symbiosis.

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Development of a fertile genetic bridge between Trifolium ambiguum M. Bieb. and T. repens L.

Cited by 22 publications

References 10 publications

Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage ofTrifolium alexandrinum(Egyptian clover)—important tropical forage legume

Interspecific compatibility barriers, development of interspecific hybrids through embryo rescue and lineage ofTrifolium alexandrinum(Egyptian clover)—important tropical forage legume

Development of a breeding strategy for interspecific hybrids between Caucasian clover and white clover

Symbiotic relationship betweenRhizobium leguminosarumbiovartrifoliiand Trifolium nigrescens

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