Origins of Diploid Dactylis from China as Determined by ITS Sequences

Stewart, Alan V.; Ellison, Nicholas W.

doi:10.1007/978-3-319-08714-6_14

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…The two subspecies santai and smithii were clustered into Cluster 1 in Group A, showing that the two subspecies appeared closely related, which is consistent with the study of Stewart and Ellison [8], in which these two subspecies were found in the same (European and North African) clade. Subspecies lobata , a synonym of D. glomerata subsp .…”

Section: Discussionsupporting

confidence: 90%

“…This genus includes only one species, Dactylis glomerata L. [3], which was interpreted as monotypic, consisting of a single diverse species complex [4,5] and referred to as orchardgrass or cocksfoot grass. Dactylis is native to the northern hemisphere and can be found throughout Europe, temperate and tropical Asia, North Africa, and the Canary Islands [6,7,8]. It has been an important forage grass for more than 100 years in almost all temperate regions of the world.…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic and Diversity Analysis of Dactylis glomerata Subspecies Using SSR and IT-ISJ Markers

et al. 2016

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Abstract:The genus Dactylis, an important forage crop, has a wide geographical distribution in temperate regions. While this genus is thought to include a single species, Dactylis glomerata, this species encompasses many subspecies whose relationships have not been fully characterized. In this study, the genetic diversity and phylogenetic relationships of nine representative Dactylis subspecies were examined using SSR and IT-ISJ markers. In total, 21 pairs of SSR primers and 15 pairs of IT-ISJ primers were used to amplify 295 polymorphic bands with polymorphic rates of 100%. The average polymorphic information contents (PICs) of SSR and IT-ISJ markers were 0.909 and 0.780, respectively. The combined data of the two markers indicated a high level of genetic diversity among the nine D. glomerata subspecies, with a Nei's gene diversity index value of 0.283 and Shannon's diversity of 0.448. Preliminarily phylogenetic analysis results revealed that the 20 accessions could be divided into three groups (A, B, C). Furthermore, they could be divided into five clusters, which is similar to the structure analysis with K = 5. Phylogenetic placement in these three groups may be related to the distribution ranges and the climate types of the subspecies in each group. Group A contained eight accessions of four subspecies, originating from the west Mediterranean, while Group B contained seven accessions of three subspecies, originating from the east Mediterranean.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Phylogenetic and Diversity Analysis of Dactylis glomerata Subspecies Using SSR and IT-ISJ Markers

et al. 2016

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“…Continuous outcrossing by wind pollination, natural selection and adaptation processes has resulted in a wide geographic range and large morphological variability [5]. It has been widely disseminated and become naturalized in many parts of the temperate and subtropical world, including Europe, Asia, North Africa, and the Canary Islands, with remarkable local adaptation and ecotype differentiation [6]. It is suggested that a successful Central Asian diploid progenitor of Dactylis glomerata, similar to today's ssp.…”

Section: Introductionmentioning

confidence: 99%

AFLP assessment of genetic variability and relationships in an Asian wild germplasm collection of Dactylis glomerata L.

Sun

Zhang

et al. 2017

Comptes Rendus. Biologies

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Orchardgrass (Dactylis glomerata L.), an excellent perennial and cool season forage species distributed in most temperate regions, has been cultivated widely in Western China. Amplified fragment length polymorphism markers were employed to determine the genetic variability and population structure among 41 indigenous orchardgrass accessions from Central Asia and Western China. On the basis of 531 polymorphic fragments resulted from eight primer combinations, polymorphic information content (PIC), marker index (MI) and resolving power (RP) averaged 0.252, 16.34 and 25.27 per primer combination, respectively, demonstrating the high efficiency and reliability of the markers used. We found relatively low differentiation (Fst=0.135) for three geographical groups, where Central Asia (CA) and Southwest China (SWC) group exhibited higher intra-population diversity (He=0.20 and 0.21) than that of the Xinjiang (XJ) group (He=0.14). We also did not detect a clear pattern of isolation by distance with a low value of r=0.301 in the Mantel test. STRUCTURE, FLOCK, UPGMA clustering and PCoA analyses showed that CA group is more related to the SWC Group rather than to the XJ Group. In addition, this study strongly suggests that geographical and ecological environmental factors together could better explain the genetic differentiation between different geographical regions than geographic isolation alone, especially for Xinjiang accessions. The present study also could support that Southwest China might be the internal diversity center of D. glomerata in China. The knowledge about the genetic variability of the Asian accessions examined contributes to rapid characterization, defining gene pools of wild accessions, and selecting appropriate germplasms for plant improvement.

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“…glomerata (Bushman et al., 2011; Van Santen & Sleper, 1996). As a high‐quality perennial cool‐season forage grass (Balde et al., 1993; Solaiman et al., 1990; Stewart & Ellison, 2015), orchardgrass is grown as a monoculture for hay or pasture or paired with other forage legumes such as alfalfa ( Medicago sativa L.) (Jones & Tracy, 2018; Van Keuren & Matches, 1988). Both orchardgrass and alfalfa have similar bimodal seasonal growth patterns (Stout & Jung, 1992), but orchardgrass cultivars predominantly flower earlier than alfalfa.…”

Section: Introductionmentioning

confidence: 99%

Late‐heading parental selection in orchardgrass (Dactylis glomerata L.)

Getz,

Robbins,

Thorsted

et al. 2024

Crop Science

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Dactylis glomerata L., orchardgrass or cocksfoot, is frequently planted as a companion crop in perennial forage legumes such as alfalfa (Medicago sativa L.). However, many commercial orchardgrass cultivars flower earlier than legumes, resulting in a reduction in grass yield and nutritional value if harvested to maximize the legume. Additionally, during orchardgrass seed production over years, later flowering can gradually shift to earlier flowering. In this study, we employed parental selection based on half‐sib family (HS‐family) trait values for dry matter yield (DMY) and heading date (HD), and augmented it with marker‐assisted selection to enrich for late‐heading‐associated alleles in six vernalization and flowering time candidate genes. The parent population resulted from polycrossing three late‐heading orchardgrass germplasm sources and evaluating 94 HS‐families. HDs differed by years and locations for both the parent and HS‐family populations. Of the 313 single‐nucleotide polymorphisms (SNPs) identified within the candidate genes, 16 were associated with HD with a range of effects from 0.48 to 3.37 days to heading. An SNP detected across multiple years and locations in this study was also found in a previous study, within the intron of the Constans 1 gene (DgCO1). DMY was not highly significant in this study, highlighting a large environmental effect alongside lower variation across the HS‐families. However, parental plants fixed for the SNP within DgCO1 showed a trend to later heading as well as higher DMY.

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Origins of Diploid Dactylis from China as Determined by ITS Sequences

Cited by 3 publications

References 15 publications

Phylogenetic and Diversity Analysis of Dactylis glomerata Subspecies Using SSR and IT-ISJ Markers

Phylogenetic and Diversity Analysis of Dactylis glomerata Subspecies Using SSR and IT-ISJ Markers

AFLP assessment of genetic variability and relationships in an Asian wild germplasm collection of Dactylis glomerata L.

Late‐heading parental selection in orchardgrass (Dactylis glomerata L.)

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