# US 8,772,578 B2 · Lettuce variety 41-53 RZ

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- Number: US 8,772,578 B2
- Document ID: US8772578B2
- Status: Granted
- Kind: B2
- Application number: 12/321,249
- Filed: 2009-01-20
- Published: 2009-07-30
- Granted: 2014-07-08
- Earliest claimed: 2008-01-25
- Assignees: Ruk Zwaan Zaadteelt en Zaadhandel B.V.
- Applicants: Aad Ammerlaan
- Inventors: Aad Ammerlaan
- Web page: https://patentgrep.com/patent/US8772578B2

## CPC

- A01H 6/1472: {Lactuca sativa [lettuce]}
- A01H 5/12: Leaves
- A01H: NEW PLANTS OR {NON-TRANSGENIC} PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES

## Abstract

The present invention relates to a Lactuca sativa L. var. longifolia Lam seed designated as 41-53 RZ, which has leaves with a solid main vein, narrow base leaves, and exhibits resistance against downy mildew (Bremia lactucae Regel), currant-lettuce aphid (Nasonovia ribisnigri) and lettuce mosaic virus (LMV). The present invention also relates to a Lactuca sativa L. var. longifolia Lam plant produced by growing the “41-53 RZ” seed. The invention further relates to methods for producing the lettuce cultivar, represented by lettuce variety 41-53 RZ.

## Claims

### Claim 1

A lettuce plant designated 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536, wherein said plant is a romaine lettuce (Lactuca saliva L. var. longifolia Lam) plant, and has leaves with a solid main vein, narrow base leaves and resistance to downy mildew (Bremia lactucae Regal), currant-lettuce aphid (Nasonovia ribisnigri) and lettuce mosaic virus (LMV).

### Claim 2 (depends on 1)

A seed of the plant of claim 1.

### Claim 3 (depends on 1)

A part of the plant of claim 1 that is suitable for sexual reproduction.

### Claim 4 (depends on 3)

The part as described in claim 3, selected from the group consisting of microspores, pollen, ovaries, ovules, embryo sacs, and egg cells.

### Claim 5 (depends on 1)

A part of the plant of claim 1 that is suitable for vegetative reproduction.

### Claim 6 (depends on 5)

The part as described in claim 5 selected from the group consisting of cuttings, roots, stems, cells, and protoplasts.

### Claim 7 (depends on 1)

A tissue culture of a lettuce plant of claim 1.

### Claim 8 (depends on 7)

The tissue culture as described in claim 7, which is derived from the group consisting of leaves, pollen, embryos, cotyledon, hypocotyls, meristematic cells, roots, root tips, anthers, flowers, seeds and stems.

### Claim 9 (depends on 2)

A plant that has all of the morphological and physiological characteristics of lettuce cultivar 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536 and is grown from seeds as described in claim 2.

### Claim 10 (depends on 3)

A plant that has all of the morphological and physiological characteristics of lettuce cultivar 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536 and is regenerated from parts as described in claim 3.

### Claim 11 (depends on 7)

A plant that has all of the morphological and physiological characteristics of lettuce cultivar 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536 and is regenerated from a tissue culture as described in claim 7.

### Claim 12 (depends on 1)

A F1 progeny of a lettuce plant of claim 1.

### Claim 13 (depends on 9)

A F1 progeny of a lettuce plant of claim 9.

### Claim 14 (depends on 10)

A F1 progeny of a lettuce plant of claim 10.

### Claim 15 (depends on 11)

A F1 progeny of a lettuce plant of claim 11.

### Claim 16 (depends on 1)

A F1 progeny of a lettuce plant of claim 1, wherein said plant is a romaine lettuce (Lactuca saliva L. var. longifolia Lam) plant, and has leaves with a solid main vein, narrow base leaves and resistance to downy mildew (Bremia lactucae Regal), currant-lettuce aphid (Nasonovia ribisnigri) and lettuce mosaic virus (LMV) as found in lettuce cultivar 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536, and is modified in one or more other characteristics.

### Claim 17 (depends on 16)

The progeny as described in claim 16, wherein the modification is effected by mutagenesis.

### Claim 18 (depends on 16)

The progeny as described in claim 16, wherein the modification is effected by transformation with a transgene.

### Claim 19 (depends on 1)

A method of producing a hybrid lettuce seed comprising crossing a first parent lettuce plant with a second parent lettuce plant and harvesting the resultant hybrid lettuce seed, wherein said first parent lettuce plant or said second parent lettuce plant is the lettuce plant of claim 1.

### Claim 20 (depends on 1)

A F1 progeny of a lettuce plant of claim 1, wherein said progeny is produced by sexual reproduction of said lettuce plant, and wherein the progeny has all of the morphological and physiological characteristics of lettuce cultivar 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536.

### Claim 21 (depends on 1)

A progeny of a lettuce plant of claim 1, wherein said progeny is produced by vegetative reproduction of said lettuce plant or a progeny plant thereof, and wherein the progeny has all of the morphological and physiological characteristics of lettuce cultivar 41-53 RZ, representative seed of which having been deposited under NCIMB Accession No. 41536.