Abstract: The present invention relates to lettuce plants (Lactuca sativa L.) which may comprise a genetic determinant, which when homozygously present in a seed, provides the seed in an unprimed state with the capability to germinate at a high temperature, which genetic determinant is obtainable from a lettuce plant which may comprise said genetic determinant, representative seed which was deposited with the NCIMB under accession number NCIMB 41914, NCIMB 41915, NCIMB 41916, NCIMB 41917, NCIMB 41918, NCIMB 41919, NCIMB 41922, NCIMB 41923, and NCIMB 41926.

Abstract: The present invention relates to plants of the Compositae family exhibiting a reversible genic male sterility trait, characterised in that the genic male sterility may be caused by a reduction or complete absence of endogenous jasmonic acid production, resulting from interference with one or more target genes involved in endogenous jasmonic acid production, selected from the group consisting of lipoxygenase, allene oxide synthase, allene oxide cyclase and 12-oxo-phytodienoic acid-10,11-reductase, or their functional homologues.

Abstract: The invention relates to a method for testing a plant or plant part for exhibiting a reduced or absent wound-induced surface discoloration as compared to a control plant or plant part, which method comprises providing a plant or plant part that is obtained from a plant population that shows genetic variation, in particular a gene bank; optionally creating a wound surface on the plant or plant part; incubating the plant or plant part or the wound surfaces created thereon to allow for discoloration to occur therein or thereon; observing the discoloration in or on the plants or plant parts; comparing the observed discoloration with the discoloration that is observed in the control plant or plant part to assess whether the plant or plant part shows no discoloration or a discoloration that is reduced as compared to the control plant or plant part; and identifying a plant or plant part that shows no discoloration or a discoloration that is reduced as compared to the control plant or plant part as a plant that harbo

Abstract: The invention relates to plants and plant parts, in particular lettuce plants (Lactuca sativa L.), which are resistant to Bremia lactucae. The invention also relates to seeds of these plants capable of producing Bremia lactucae resistant plants. The invention further relates to methods for obtaining said plants with altered genotypes and seeds thereof, which are resistant to Bremia lactucae.

Abstract: Provided is a method for screening a population of plants for the presence therein of individuals that show a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting and Yellowing, as compared to a control plant, wherein a population of seeds is germinated in darkness and in the presence of ethylene to obtain seedlings that, when having a longer hypocotyl as compared to the original ethylene-sensitive control under ethylene, are selected as plants showing a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting or Yellowing. Also provided are plants thus selected.

Abstract: The present invention relates to a head-forming lettuce plant of the species Lactuca sativa having red leaves throughout the head, including the heart. The red leaves in the heart are red even in the absence of radiation with wavelengths shorter than 400 nm, wherein the absence of radiation with wavelengths shorter than 400 nm is in the growing environment during the complete period from sowing until observation. The ratio between anthocyanin and chlorophyll is between 4 and 50, preferably between 9 and 27. The invention also relates to progeny of the plant.

Abstract: Provided is a method for screening a population of plants for the presence therein of individuals that show a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting and Yellowing, as compared to a control plant, wherein a population of seeds is germinated in darkness and in the presence of ethylene to obtain seedlings that, when having a longer hypocotyl as compared to the original ethylene-sensitive control under ethylene, are selected as plants showing a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting or Yellowing. Also provided are plants thus selected.

Abstract: Provided is a method for mapping traits in organisms, in particular in plants. The method comprises a) providing a population of SDR-0 organisms, in particular plants, that each arise from one member of a population of unreduced cells resulting from second division restitution, in particular a population of unreduced spores; b) producing SDR-1 progeny populations of each of these SDR-0 organisms; c) phenotyping the SDR-1 progeny populations to identify segregating traits within each SDR-1 progeny population; d) if segregating progeny are present in a SDR-1 progeny population, genotyping the corresponding SDR-0 organism and comparing the genotype thereof with the genotype of the other SDR-0 organisms to identify heterozygous chromosomal regions associated with the occurrence of the segregating trait identified in the SDR-1 progeny population.

Abstract: The present invention relates to a head-forming lettuce plant of the species Lactuca sativa having red leaves throughout the head, including the heart. The red leaves in the heart are red even in the absence of radiation with wavelengths shorter than 400 nm, wherein the absence of radiation with wavelengths shorter than 400 nm is in the growing environment during the complete period from sowing until observation. The ratio between anthocyanin and chlorophyll is between 4 and 50, preferably between 9 and 27. The invention also relates to progeny of the plant.

Abstract: The present invention relates to a for obtaining a plant showing a reduced susceptibility towards infection with a pathogen, in particular an oomycete, comprising treating MO seeds of a plant species to be modified with a mutagenic agent to obtain M1 seeds and growing plants therefrom the thus obtained M1 seeds to obtain M1 plants, inoculation of the thus obtained M1+n plants with the pathogen and selecting plants that show a reduction or absence of sporulation of the pathogen as plants having a reduced susceptibility phenotype. The invention further relates to plants, seeds, pollen, cells and tissues that have the reduced susceptibility towards oomycetes.

Abstract: Provided is a method for mapping traits in organisms, in particular in plants. The method comprises a) providing a population of SDR-0 organisms, in particular plants, that each arise from one member of a population of unreduced cells resulting from second division restitution, in particular a population of unreduced spores; b) producing SDR-1 progeny populations of each of these SDR-0 organisms; c) phenotyping the SDR-1 progeny populations to identify segregating traits within each SDR-1 progeny population; d) if segregating progeny are present in a SDR-1 progeny population, genotyping the corresponding SDR-0 organism and comparing the genotype thereof with the genotype of the other SDR-0 organisms to identify heterozygous chromosomal regions associated with the occurrence of the segregating trait identified in the SDR-1 progeny population.

Abstract: Provided is a method for mapping traits in organisms, in particular in plants. The method comprises a) providing a population of SDR-0 organisms, in particular plants, that each arise from one member of a population of unreduced cells resulting from second division restitution, in particular a population of unreduced spores; b) producing SDR-1 progeny populations of each of these SDR-0 organisms; c) phenotyping the SDR-1 progeny populations to identify segregating traits within each SDR-1 progeny population; d) if segregating progeny are present in a SDR-1 progeny population, genotyping the corresponding SDR-0 organism and comparing the genotype thereof with the genotype of the other SDR-0 organisms to identify heterozygous chromosomal regions associated with the occurrence of the segregating trait identified in the SDR-1 progeny population.

Abstract: Provided is a method for screening a population of plants for the presence therein of individuals that show a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting and Yellowing, as compared to a control plant, wherein a population of seeds is germinated in darkness and in the presence of ethylene to obtain seedlings that, when having a longer hypocotyl as compared to the original ethylene-sensitive control under ethylene, are selected as plants showing a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting or Yellowing. Also provided are plants thus selected.

Abstract: Provided is a method for screening a population of plants for the presence therein of individuals that show a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting and Yellowing, as compared to a control plant, wherein a population of seeds is germinated in darkness and in the presence of ethylene to obtain seedlings that, when having a longer hypocotyl as compared to the original ethylene-sensitive control under ethylene, are selected as plants showing a reduced susceptibility to ethylene and physiological disorders, in particular Russet Spotting or Yellowing. Also provided are plants thus selected.

Abstract: The invention relates to a method for testing a plant or plant part for exhibiting a reduced or absent wound-induced surface discoloration as compared to a control plant or plant part, which method comprises providing a plant or plant part that is obtained from a plant population that shows genetic variation, in particular a gene bank; optionally creating a wound surface on the plant or plant part; incubating the plant or plant part or the wound surfaces created thereon to allow for discoloration to occur therein or thereon; observing the discoloration in or on the plants or plant parts; comparing the observed discoloration with the discoloration that is observed in the control plant or plant part to assess whether the plant or plant part shows no discoloration or a discoloration that is reduced as compared to the control plant or plant part; and identifying a plant or plant part that shows no discoloration or a discoloration that is reduced as compared to the control plant or plant part as a plant that harbo

Abstract: The present invention relates to a head-forming lettuce plant of the species Lactuca sativa having red leaves throughout the head, including the heart. The red leaves in the heart are red even in the absence of radiation with wavelengths shorter than 400 nm, wherein the absence of radiation with wavelengths shorter than 400 nm is in the growing environment during the complete period from sowing until observation. The ratio between anthocyanin and chlorophyll is between 4 and 50, preferably between 9 and 27. The invention also relates to progeny of the plant.

Abstract: The present invention relates to a Lactuca sativa L. var. longifolia Lam seed designated as 41-52 RZ, referred to as Nirvanus, which exhibits resistance against downy mildew (Bremia lactucae Regel), currant-lettuce aphid (Nasonovia ribis-nigri), corky root (Sphingomonas suberifaciens) and lettuce mosaic virus (LMV), the representative seed having been deposited with the National Collections of Industrial, Marine and Food Bacteria (NCIMB) in Bucksburn, Aberdeen AB21 9YA, Scotland, UK and assigned NCIMB Acession No. 41326. The present invention also relates to a Lactuca sativa L. var. longifolia Lam plant produced by growing the 41-52 RZ (Nirvanus) seed. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 41-52 RZ.