Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Records 1 - 13 / 13

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    Handboek Groenbemesters 2019
    Leeuwen-Haagsma, W.K. van; Hoek, H. ; Molendijk, L.P.G. ; Mommer, L. ; Ulen, Jacqueline ; Kroonen-Backbier, B.M.A. ; Groot, G.A. de - \ 2019
    Wageningen : Wageningen University & Research
    Presentaties groenbemesters (WURKS-project Groenbemesters)
    Ulen, Jacqueline ; Kroonen-Backbier, B.M.A. - \ 2019
    8 presentaties die zijn opgenomen in het Groen Kennisnet dossier Groenbemesters ( WURKS-project). 8 presentaties: 1) Groenbemesters waarom en hoe 2) Keuze groenbemesters 3) Kruisbloemige groenbemesters 4) Grasgroenbemesters 5) Vlinderbloemige groenbemesters 6) Overige groenbemesters 7) N-vanggewas na mais 8) Bewerken van groenbemesters.
    Drijfmest in maisrij roept nog veel vragen op
    Ulen, Jacqueline ; Kroonen, M.J.E. ; Kroonen-Backbier, B.M.A. - \ 2019
    Patterns of Transmission Ratio Distortion in Interspecific Lettuce Hybrids Reveal a Sex-Independent Gametophytic Barrier
    Giesbers, A.K.J. ; Boer, E. den; Ulen, Jacqueline ; Kaauwen, M.P.W. van; Visser, R.G.F. ; Niks, R.E. ; Jeuken, M.J.W. - \ 2019
    Genetics 211 (2019)1. - ISSN 0016-6731 - p. 263 - 276.
    Interspecific crosses can result in progeny with reduced vitality or fertility due to genetic incompatibilities between species, a phenomenon known as hybrid incompatibility (HI). HI is often caused by a bias against deleterious allele combinations, which results in transmission ratio distortion (TRD). Here, we determined the genome-wide distribution of HI between wild lettuce, Lactuca saligna, and cultivated lettuce, L. sativa, in a set of backcross inbred lines (BILs) with single introgression segments from L. saligna introgressed into a L. sativa genetic background. Almost all BILs contained an introgression segment in a homozygous state except a few BILs, for which we were able to obtain only a single heterozygous introgression. Their inbred progenies displayed severe TRD with a bias toward the L. sativa allele and complete nontransmission of the homozygous L. saligna introgression, i.e., absolute HI. These HI might be caused by deleterious heterospecific allele combinations at two loci. We used an multilocus segregating interspecific F2 population to identify candidate conspecific loci that can nullify the HI in BILs. Segregation analysis of developed double-introgression progenies showed nullification of three HI and proved that these HI are explained by nuclear pairwise incompatibilities. One of these digenic HI showed 29% reduced seed set and its pattern of TRD pointed to a sex-independent gametophytic barrier. Namely, this HI was caused by complete nontransmission of one heterospecific allele combination at the haploid stage, surprisingly in both male and female gametophytes. Our study shows that two-locus incompatibility systems contribute to reproductive barriers among Lactuca species.
    Lactuca SNP marker development
    Giesbers, Anne ; Boer, Erik den; Ulen, Jacqueline ; Kaauwen, Martijn van; Visser, Richard ; Niks, Rients ; Jeuken, Marieke - \ 2018
    Wageningen University & Research
    PRJNA434185
    Generate SNPs between L. sativa cv. "Olof" and a pool of 5 L. saligna accessions
    Supplement to Giesbers et al., 2018: Patterns of Transmission Ratio Distortion in Interspecific Lettuce Hybrids Reveal a Sex-Independent Gametophytic Barrier
    Giesbers, Anne ; Boer, Erik den; Visser, Richard ; Niks, Rients ; Kaauwen, Martijn van; Jeuken, Marieke ; Ulen, Jacqueline - \ 2018
    Wageningen University & Research
    Hybrid Sterility - Transmission Ratio Distortion - Dobzhansky-Muller - Postzygotic Reproductive Barrier - Epistasis
    Interspecific crosses can result in progeny with reduced vitality or fertility due to genetic incompatibilities between species, a phenomenon known as hybrid incompatibility (HI). HI is often caused by a bias against deleterious allele combinations, which results in transmission ratio distortion (TRD). Here, we determined the genome-wide distribution of HI between wild lettuce, Lactuca saligna, and cultivated lettuce, L. sativa, in a set of backcross inbred lines (BILs) with single introgression segments from L. saligna introgressed into a L. sativa genetic background. Almost all BILs contained an introgression segment in a homozygous state except a few BILs, for which we were able to obtain only a single heterozygous introgression. Their inbred progenies displayed severe TRD with a bias toward the L. sativa allele and complete nontransmission of the homozygous L. saligna introgression, i.e., absolute HI. These HI might be caused by deleterious heterospecific allele combinations at two loci. We used an multilocus segregating interspecific F2 population to identify candidate conspecific loci that can nullify the HI in BILs. Segregation analysis of developed double-introgression progenies showed nullification of three HI and proved that these HI are explained by nuclear pairwise incompatibilities. One of these digenic HI showed 29% reduced seed set and its pattern of TRD pointed to a sex-independent gametophytic barrier. Namely, this HI was caused by complete nontransmission of one heterospecific allele combination at the haploid stage, surprisingly in both male and female gametophytes. Our study shows that two-locus incompatibility systems contribute to reproductive barriers among Lactuca species.
    Wet maakt maisteelt op zand uitdaging
    Ulen, Jacqueline - \ 2018
    Teelt groenbemester na maïs blijft moeilijk
    Kroonen-Backbier, B.M.A. ; Ulen, Jacqueline - \ 2018
    De Groenbemesterdag: 'Zonder fantasie gebeurt er niets'
    Molendijk, L.P.G. ; Ulen, Jacqueline - \ 2018
    Experimenteren met maïsteelt zonder mest
    Ulen, Jacqueline - \ 2018
    Gras onderzaaien
    Verhoeven, J.T.W. ; Ulen, Jacqueline - \ 2018
    Projectdemo: nog veel onduidelijkheid over onderzaai vanggewas
    Ulen, Jacqueline - \ 2018
    Laatste testjaar voor onderzaai gras in mais
    Ulen, Jacqueline - \ 2018
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