Lettuce variety 45-21 rz, lorquinas rz
AssigneeRijk Zwaan Zaadteelt En Zaadhandel B.V.
InventorsJohannes Petrus Antonius Jansen, Maria Helena Roosenboom-Kooijman, Willem van Vliet
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Abstract
The present invention relates to a Lactuca sativa seed designated 45-21 RZ, which exhibits a combination of traits including resistance to downy mildew (Bremia lactucae) races Bi:1 to Bl:28 and CA-I to CA-VIII, resistance to currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, very slow bolting, moderately to deeply incised margins of the mature leaves and a large head size. The present invention also relates to a Lactuca sativa plant produced by growing the 45-21 RZ seed. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 45-21 RZ.
Claims35
A lettuce plant exhibiting a combination of traits including resistance to downy mildew (Bremia lactucae) races Bl:1 to Bl:28 and CA-I to CA-VIII, resistance to currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, very slow bolting, moderately to deeply incised margins of the mature leaves and a large head size, representative seed of which having been deposited under NCIMB Accession No. 41901.
A lettuce plant designated 45-21 RZ, representative seed of which having been deposited under NCIMB Accession No. 41901.
A method of producing a lettuce cultivar containing a combination of traits including resistance to downy mildew (Bremia lactucae) races Bl:1 to Bl:28 and CA-I to CA-VIII, resistance to currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, very slow bolting, moderately to deeply incised margins of the mature leaves and a large head size, comprising:
- crossing a mother lettuce plant with a father lettuce plant to produce a hybrid seed;
- growing said hybrid seed to produce a hybrid plant;
- selfing said hybrid plant to produce F2 progeny seed;
- growing said F2 progeny seed to produce F2-plants;
- selecting said F2-plants for exhibiting resistance to downy mildew (Bremia lactucae) races Bl:1 to Bl:28 and CA-I to CA-VIII, resistance to currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, very slow bolting, moderately to deeply incised margins of the mature leaves and a large head size, and, selfing said selected F2-plants to produce F3 progeny seed;
- growing said F3 progeny seed to produce F3-plants;
- selecting F3-plants for exhibiting resistance to downy mildew (Bremia lactucae) races Bl:1 to Bl:28 and CA-I to CA-VIII, resistance to currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, very slow bolting, moderately to deeply incised margins of the mature leaves and a large head size, optionally followed by more selfing and selection steps.
A lettuce plant having morphological and/or physiological characteristics of a lettuce plant, representative seed of which having been deposited under NCIMB Accession No. 41901.
A method of introducing a desired trait into a plant of lettuce variety 45-21 RZ comprising:
- (a) crossing a plant of lettuce variety 45-21 RZ, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41901, with a second lettuce plant that comprises the desired trait to produce F1 progeny;
- (b) selecting an F1 progeny that comprises the desired trait;
- (c) crossing the selected F1 progeny with a plant of lettuce variety 45-21 RZ, to produce backcross progeny and (d) selecting backcross progeny comprising the desired trait and the physiological and morphological characteristic of a plant of lettuce variety 45-21 RZ, when grown in the same environmental conditions.
A method for producing a seed of a 45-21 RZ-derived lettuce plant comprising (a) crossing a plant of lettuce variety 45-21 RZ, representative seed of which having been deposited under NCIMB Accession No. NCIMB 41901, with a second lettuce plant, and (b) whereby seed of a 45-21 RZ-derived lettuce plant forms.
A method of determining the genotype of a plant of lettuce variety 45-21 RZ, representative seed of which has been deposited under NCIMB Accession No. NCIMB 41901, or a first generation progeny thereof, comprising obtaining a sample of nucleic acids from said plant and comparing said nucleic acids to a sample of nucleic acids obtained from a reference plant, and detecting a plurality of polymorphisms between the two nucleic acid samples, wherein the plurality of polymorphisms are indicative of and/or give rise to the expression of the morphological and physiological characteristics of lettuce variety 45-21 RZ.
Dependencies are inferred from the claim text.