Lettuce variety 45-193 RZ
AssigneeRijk Zwaan Zaadteelt En Zaadhandel B.V.
InventorsMaria Helena Roosenboom-Kooijmans, Willem van Vliet
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Abstract
The present invention relates to a Lactuca sativa seed designated 45-193 RZ, which exhibits a combination of traits including resistance to downy mildew (Bremia lactucae Regel) races B1:1 to B1:31 and CA-I to CA-VIII, currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, and root aphids (Pemphigus bursarius), and which has a medium head size, medium sized outer leaves, and moderately incised leaves. The present invention also relates to a Lactuca sativa plant produced by growing the 45-193 RZ seed. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 45-193 RZ.
Claims34
A lettuce plant designated 45-193 RZ, representative seed of which having been deposited under NCIMB Accession No. 42344, wherein said plant comprises at least the following combination of traits including resistance to downy mildew (Bremia lactucae Regel) races B1:1 to B1:31 and CA-I to CA-VIII, currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, and root aphids (Pemphigus bursarius), and which has a medium head size, medium sized outer leaves, and moderately incised leaves.
A method of producing a lettuce cultivar containing a combination of traits including resistance to downy mildew (Bremia lactucae Regel) races B1:1 to B1:31 and CA-I to CA-VIII, currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, and root aphids (Pemphigus bursarius), and which has a medium head size, medium sized outer leaves, and moderately incised leaves, representative seed of which having been deposited under NCIMB Accession No. 42344, 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 Regel) races B1:1 to B1:31 and CA-I to CA-VIII, currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, and root aphids (Pemphigus bursarius), and which has a medium head size, medium sized outer leaves, and moderately incised leaves, 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 Regel) races B1:1 to B1:31 and CA-I to CA-VIII, currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, and root aphids (Pemphigus bursarius), and which has a medium head size, medium sized outer leaves, and moderately incised leaves, representative seed of which having been deposited under NCIMB Accession No. 42344 optionally followed by more selfing and selection steps.
A lettuce plant having resistance to downy mildew (Bremia lactucae Regel) races B1:1 to B1:31 and CA-I to CA-VIII, currant-lettuce aphid (Nasonovia ribisnigri) biotype Nr:0, and root aphids (Pemphigus bursarius), and which has a medium head size, medium sized outer leaves, and moderately incised leaves and other morphological and/or physiological characteristics of a lettuce plant, representative seed of which having been deposited under NCIMB Accession No. 42344.
A method of introducing a desired trait into a plant of lettuce variety 45-193 RZ comprising:
- (a) crossing a plant of lettuce variety 45-193 RZ, representative seed of which having been deposited under NCIMB Accession No. 42344, 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 45-193 RZ, to produce backcross progeny and (d) selecting backcross progeny comprising the desired trait and physiological and morphological characteristics of a plant of lettuce variety 45-193 RZ, when grown in the same environmental conditions.
A method for producing a seed of a 45-193 RZ-derived lettuce plant comprising (a) crossing a plant of lettuce variety 45-193 RZ, representative seed of which having been deposited under NCIMB Accession No. 42344, with a second lettuce plant, and (b) whereby seed of a 45-193 RZ-derived lettuce plant forms.
Dependencies are inferred from the claim text.