Lettuce variety 41-49 RZ

1. A lettuce plant of the cultivar designated 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692, wherein said plant is a romaine lettuce ( Lactuca sativa L. var. longifolia Lam) plant, and has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV).

2. A seed of the plant of claim 1 .

3. A lettuce plant that has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692 and is grown from seeds as described in claim 2 .

4. A F 1 , F 2 , F 3 , F 4 , F 5 , F 6 , or F 7 progeny of a lettuce plant of claim 3 , wherein the progeny has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

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

6. The part as described in claim 5 , selected from the group consisting of microspores, pollen, ovaries, ovules, embryo sacs, and egg cells.

7. A lettuce plant that has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692 and is regenerated from parts as described in claim 3 .

8. A F 1 , F 2 , F 3 , F 4 , F 5 , F 6 , or F 7 progeny of a lettuce plant of claim 7 , wherein the progeny has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

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

10. The part as described in claim 9 selected from the group consisting of cuttings, roots, stems, cells, and protoplasts.

11. A tissue culture of a lettuce plant of claim 1 .

12. The tissue culture as described in claim 11 , which is derived from the group consisting of leaves, pollen, embryos, cotyledon, hypocotyls, meristematic cells, roots, root tips, anthers, flowers, seeds and stems.

13. A lettuce plant that has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692 and is regenerated from a tissue culture as described in claim 11 .

14. A F 1 , F 2 , F 3 , F 4 , F 5 , F 6 , or F 7 progeny of a lettuce plant of claim 13 , wherein the progeny has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

15. A F 1 , F 2 , F 3 , F 4 , F 5 , F 6 , or F 7 progeny of a lettuce plant of claim 1 , wherein the progeny has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

16. A F 1 , F 2 , F 3 , F 4 , F 5 , F 6 , or F 7 progeny of a lettuce plant of claim 1 , wherein said plant is a romaine lettuce ( Lactuca sativa L. var. longifolia Lam) plant, and has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) as found in lettuce cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692, and is modified in one or more other characteristics.

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

18. A F 1 progeny of a lettuce plant, which is produced by sexual reproduction of a lettuce plant of claim 1 , wherein the regenerated plant has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( bremia Lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

19. A F 2 , F 3 , F 4 , F 5 , F 6 , or F 7 progeny of a lettuce plant, which is produced by sexual reproduction of a progeny plant of a lettuce plant of claim 1 , wherein the regenerated plant has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( bremia Lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

20. A progeny of a lettuce plant which is produced by vegetative reproduction of a lettuce plant of claim 1 or a progeny plant thereof, wherein the regenerated plant has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

21. A lettuce plant that has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692.

22. 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 or 21 .

23. A method of producing a lettuce plant that has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692 comprising crossing a first lettuce plant with a second lettuce plant wherein the first or second lettuce plant is the lettuce plant of claim 1 or 21 .

24. A lettuce plant which has leaves with a hollow main vein, broad base leaves and resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV) of lettuce plant of cultivar 41-49 RZ, representative seed of which having been deposited under NCIMB Accession No. 41692 wherein the plant is produced by the method of claim 23 .

25. The lettuce plant of claim 1 or 21 generated from seed deposited under NCIMB Accession No. 41692.

26. A method of producing a lettuce cultivar being a romaine lettuce ( Lactuca sativa L. var. longifolia Lam) plant, and having leaves with a hollow main vein, broad base leaves, resistance to downy mildew ( Bremia lactucae Regal), currant-lettuce aphid ( Nasonovia ribisnigri ), corky root ( Sphingomonas suberifaciens ) and lettuce mosaic virus (LMV), comprising: (a) crossing a mother lettuce plant with a father lettuce plant to produce a hybrid seed; (b) growing said hybrid seed to produce a hybrid plant; (c) selfing said hybrid seed to produce F 2 progeny seed; and (d) selecting said F 2 plants for being a romaine lettuce ( Lactuca sativa L. var. longifolia Lam) plant and having leaves with a hollow main vein, broad base leaves, and resistance to downy mildew ( Bremia lactucae Regal), corky root ( Sphingomonas suberifaciens ), currant-lettuce aphid and lettuce mosaic virus (LMV).