Breeding Perennial Grain Crops Based on Wheat

Curwen-McAdams, Colin; Jones, Stephen S.

doi:10.2135/cropsci2016.10.0869

Cited by 22 publications

(14 citation statements)

References 126 publications

(153 reference statements)

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“…Although evidence of different pan‐genome gene content between inbred lines in sunflowers was recently shown (Hubner et al., ), the role of introgression in gene loss has not been previously appreciated. Missing genes may play a role in linkage drag, which is a concern to breeders when wild relatives are employed for improvement (Curwen‐McAdams & Jones, ). Linkage drag refers to the often maladaptive impact of genetic material that is introduced into cultivated lines along with the beneficial trait that is targeted by selection.…”

Section: Discussionmentioning

confidence: 99%

“…Although evidence of different pan-genome gene content between inbred lines in sunflowers was recently shown (Hubner et al, 2018), the role of introgression in gene loss has not been previously appreciated. Missing genes may play a role in linkage drag, which is a concern to breeders when wild relatives are employed for improvement (Curwen-McAdams & Jones, 2017).…”

Section: Introgression Brings Gene Loss In Restorer Linesmentioning

confidence: 99%

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Genomic sequence and copy number evolution during hybrid crop development in sunflowers

Owens

Baute

Hübner

2018

Evolutionary Applications

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Hybrid crops, an important part of modern agriculture, rely on the development of male and female heterotic gene pools. In sunflowers, heterotic gene pools were developed through the use of crop‐wild relatives to produce cytoplasmic male sterile female and branching, fertility restoring male lines. Here, we use genomic data from a diversity panel of male, female, and open‐pollinated lines to explore the genetic changes brought during modern improvement. We find the male lines have diverged most from their open‐pollinated progenitors and that genetic differentiation is concentrated in chromosomes, 8, 10 and 13, due to introgressions from wild relatives. Ancestral variation from open‐pollinated varieties almost universally evolved in parallel for both male and female lines suggesting little or no selection for heterotic overdominance. Furthermore, we show that gene content differs between the male and female lines and that differentiation in gene content is concentrated in high F ST regions. This means that the introgressions that brought branching and fertility restoration to the male lines, brought with them different gene content from the ancestral haplotypes, including the removal of some genes. Although we find no evidence that gene complementation genomewide is responsible for heterosis between male and female lines, several of the genes that are largely absent in either the male or female lines are associated with pathogen defense, suggesting complementation may be functionally relevant for crop breeders.

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Section: Discussionmentioning

confidence: 99%

Section: Introgression Brings Gene Loss In Restorer Linesmentioning

confidence: 99%

Genomic sequence and copy number evolution during hybrid crop development in sunflowers

Owens

Baute

Hübner

2018

Evolutionary Applications

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“…The first successful cross between annual and perennial Triticeae species was from the Russian program in 1930 and is attributed to N. V. Tsitsin [1]. Since that time there has been sporadic activity around the globe to generate further wheat × wheatgrass hybrids [2]. Whilst in some instances, such as in the early Russian work, the intent was undoubtedly to create a new plant form through wide hybridization [1,3], other outputs of successful wide hybridization were merely a product of wheat breeding programs seeking to introgress heritable traits from perennial relative species into conventional wheat [4].…”

Section: Introductionmentioning

confidence: 99%

“…At The Land Institute (Salina, KS, USA) for example, there has been an ongoing effort since 2002 to hybridize wheat and perennial wheatgrass species in order to develop a genuine perennial grain crop [5]. A similar program was established independently at around the same time at Washington State University [2]. Concurrently The Land Institute has also sought to "domesticate" the perennial species, intermediate wheatgrass (Thinopyrum intermedium (Host) Barkworth & Dewey), as a grain crop through breeding and selection on the basis of grain production attributes [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Performance of Early-Generation Perennial Winter Cereals at 21 Sites across Four Continents

Hayes¹,

Wang

Newell

et al. 2018

Sustainability

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A network of 21 experiments was established across nine countries on four continents and spanning both hemispheres, to evaluate the relative performance of early generation perennial cereal material derived from wheat, rye, and barley and to inform future breeding strategies. The experimental lines were grown in replicated single rows, and first year production and phenology characteristics as well as yield and persistence for up to three years were monitored. The study showed that the existing experimental material is all relatively short-lived (≤3 years), with environments that are milder in summer and winter generally conferring greater longevity. No pedigree was superior across this diverse network of sites although better performing lines at the higher latitude sites were generally derived from Thinopyrum intermedium. By contrast, at lower latitudes the superior lines were generally derived from Th. ponticum and Th. elongatum parentage. The study observed a poor relationship between year 1 performance and productivity in later years, highlighting the need for perennial cereal material with greater longevity to underpin future experimental evaluation, and the importance for breeding programs to emphasize post-year 1 performance in their selections. Hybrid lines derived from the tetraploid durum wheat generally showed greater longevity than derivatives of hexaploid wheat, highlighting potential for greater use of Triticum turgidum in perennial wheat breeding. We advocate a model in future breeding initiatives that develops perennial cereal genotypes for specific target environments rather than a generic product for one global market. These products may include a diversity of cultivars derived from locally adapted annual and perennial parents. In this scenario the breeding program may have access to only a limited range of adapted perennial grass parents. In other situations, such as at very high latitude environments, perennial crops derived from barley or rye may have a better chance of success than those derived from wheat. In either case, development and selection of the perennial parent for adaptation to local environments would seem fundamental to success.

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“…The use of food legume CWR to improve abiotic stress tolerance is illustrated by Naim‐Feil et al (2017) in “ Drought Response and Genetic Diversity in Pisum fulvum , a Wild Relative of Domesticated Pea ” and Souter et al (2017), in “ Successful Introgression of Abiotic Stress Tolerance from Wild Tepary Bean to Common Bean .” Similar to sunflower and peanut, wheat is another crop that has benefited from a broad gene pool. Curwen‐McAdams and Jones (2017), in “ Breeding Perennial Grain Crops Based on Wheat ,” discuss the use of wheat relatives to develop a perennial grain crop. Zhang et al (2017), in “ Meiotic Homoeologous Recombination‐based Alien Gene Introgression in the Genomics Era of Wheat ,” describe methodology that streamlines the identification and introgression of alien genes through homoeologous recombination and marker‐assisted selection to improve the utilization of wild species in wheat.…”

mentioning

confidence: 99%