How wide can a wide cross be?

Sharma, H. C.

doi:10.1007/bf00028709

Cited by 100 publications

(69 citation statements)

References 117 publications

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“…Two different genomes share the same cytoplasm in F1 hybrids and allopolyploids, though there can be a tendency for one genome to be lost; for example, in some Hordeum hybrids (Bennett et al, 1976). Very wide hybridisations between cereals and other grasses are possible, but only by ovule pollination and early stage embryo rescue (Sharma, 1995). In the Polygonaceae, F. japonica can cross naturally with both F. baldschuanica and Muehlenbeckia taxa to give viable and germinable progeny.…”

Section: Discussionmentioning

confidence: 99%

“…There is also the question of the disparity in ploidy levels of the parents. In cereals, there is some evidence that successful seed production in crosses between ploidy levels is greater when the higher ploidy is the female, rather than the reciprocal (Sharma, 1995). In the Brassicaceae, Scott et al (1998) found that seed abortion occurred in both directions in crosses between 2 Â and 6 Â Arabidopsis plants, suggesting maternal or paternal excess in the endosperm as the cause.…”

Section: Hybrids Within Fallopia Section Reynoutriamentioning

confidence: 99%

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The Japanese knotweed invasion viewed as a vast unintentional hybridisation experiment

Bailey

2012

Heredity

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Chromosome counts of plants grown from open-pollinated seed from Japanese knotweed around the world have revealed the presence of extensive hybridisation with both native and other introduced taxa. These hybrids fit into three categories: interand intraspecific hybrids involving the taxa of Fallopia section Reynoutria (giant knotweeds), hybrids between Japanese knotweed and F. baldschuanica (Regel) Holub and hybrids between Japanese knotweed and the Australasian endemics of the genus Muehlenbeckia. In this minireview, the viability of the different classes of hybrid and the potential threats they pose are discussed in the context of recent examples of allopolyploid speciation, which generally involve hybridisation between a native and an alien species. Such wide hybridisations also challenge accepted taxonomic classifications. Japanese knotweed s.l. provides a fascinating example of the interplay between ploidy level, hybridisation and alien plant invasion. The octoploid (2n ¼ 88) Fallopia japonica var. japonica (Houtt.) Ronse Decraene is a single female clone throughout much of its adventive range, and provides an ideal system for investigating the potential for wide hybridisation.

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Section: Discussionmentioning

confidence: 99%

Section: Hybrids Within Fallopia Section Reynoutriamentioning

confidence: 99%

The Japanese knotweed invasion viewed as a vast unintentional hybridisation experiment

Bailey

2012

Heredity

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“…Marker Assisted Selection (MAS) will facilitate the development of Near Isogenic Lines (NILs) of cultivars with high crossability. These lines can be utilized to produce new triticales, amphidiploids, and to introduce translocations for the introgression of alien genes for abiotic or biotic stress resistance, improving seed quality and yield from other gene pools (Sharma 1995, Molnar-Lang et al 1996, Lelley 2006.…”

Section: Discussionmentioning

confidence: 99%

Molecular mapping of SKr for crossability in common wheat

et al. 2009

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The crossability of common wheat with alien species, e.g., rye, wild and cultivated barley, is known to be controlled by the Kr gene family. The reproduction barrier caused by Kr genes decreases hybrid seed set; however, the molecular mechanism is still unclear. We attempted to localize the QTLs controlling the crossability of wheat in wheat-rye crosses by using molecular markers on wheat chromosome 5B on which the most effective Kr gene is known to be located. QTL mapping was carried out using the F 7 population derived from a cross between Chinese Spring (high crossability) and a chromosome substitution line of Chinese Spring which has its chromosome 5B of Cheyenne (low crossability), and pollinated with rye cv. Petkus. In this population, a major QTL region controlling crossability with rye was detected on the locus closely linked to a SSR marker, Xgwm443, on the short arm of chromosome 5B which was supposed to be Skr locus.

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“…A decade later, Jiang et al (1994) added 38 additional species, including 17 in Elymus and 6 in Leymus, to the list of hybrids. Sharma (1995) reviewed the production of hybrids between wheat and more than 50 perennial species.…”

Section: Production Of New Hybridsmentioning

confidence: 99%

Breeding Perennial Grain Crops

Cox

Bender

Picone

et al. 2002

BPTS

161

113

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Abstract:One-third of the planet's arable land has been lost to soil erosion in recent decades, and the pace of this degradation will increase as the limits of our food-production capacity are stretched. The persistent problem of worldwide soil erosion has rekindled interest in perennial grain crops. All of our current grain crops are annuals; therefore, developing an array of new perennial grains -grasses, legumes, and others -will require a long-term commitment. Fortunately, many perennial species can be hybridized with related annual crops, allowing us to incorporate genes of domestication much more quickly than did our ancestors who first selected the genes. Some grain crops -including rye, rice, and sorghum -can be hybridized with close perennial relatives to establish new gene pools. Others, such as wheat, oat, maize, soybean, and sunflower, must be hybridized with more distantly related perennial species and genera. Finally, some perennial species with relatively high grain yields -intermediate wheatgrass, wildrye, lymegrass, eastern gamagrass, Indian ricegrass, Illinois bundleflower, Maximilian sunflower, and probably others -are candidates for direct domestication without interspecific hybridization. To ensure diversity in the field and foster further genetic improvement, breeders will need to develop deep gene pools for each crop. Discussions of breeding strategies for perennial grains have concentrated on allocation of photosynthetic resources between seeds and vegetative structures. But perennials will likely be grown in more diverse agro-ecosystems and require arrays of traits very different from those usually addressed by breeders of annuals. The only way to address concerns about the feasibility of perennial grains is to carry out breeding programs with adequate resources on a sufficient time scale. A massive program for breeding perennial grains could be funded by diversion of a relatively small fraction of the world's agricultural research budget.

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How wide can a wide cross be?

Cited by 100 publications

References 117 publications

The Japanese knotweed invasion viewed as a vast unintentional hybridisation experiment

The Japanese knotweed invasion viewed as a vast unintentional hybridisation experiment

Molecular mapping of SKr for crossability in common wheat

Breeding Perennial Grain Crops

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