Carnation antisense deoxyhypusine synthase molecule and method of inhibiting deoxyhypusine synthase expression in plants
Regulation of expression of programmed cell death, including senescence, in plants is achieved by integration of a gene or gene fragment encoding senescence-induced deoxyhypusine synthase, senescence-induced elF-5A or both into the plant genome in antisense orientation. Plant genes encoding senescence-induced deoxyhypusine synthase and senescence-induced elF-5A are identified and the nucleotide sequences of each, alone and in combination are used to modify senescence in transgenic plants.
1. An isolated antisense polynucleotide of SEQ ID NO:9 wherein said antisense polynucleotide inhibits expression of an endogenous senescence-induced deoxyhypusine synthase gene comprising SEQ ID NO:9 when said antisense polynucleotide is transcribed in a plant cell.
2. A vector for transformation of plant cells comprising
(a) the antisense polynucleotide of claim 1 and
(b) regulatory sequences operatively linked to the antisense polynucleotide such that the antisense polynucleotide is transcribed in a plant cell into which it is transformed.
3. The vector according to claim 2 wherein the regulatory sequences comprise a promoter and a transcription termination region.
4. The vector according to claim 2 wherein the regulatory sequences comprise a constitutive promoter.
5. The vector according to claim 2 wherein the regulatory sequences comprise a plant tissue-specific promoter.
6. The vector according to claim 2 wherein the regulatory sequences comprise a senescence-induced plant promoter.
7. The vector according to claim 2 wherein the regulatory sequences comprise a viral promoter.
8. A bacterial cell transformed with the vector according to claim 2 .
9. A transgenic plant cell transformed with the vector according to claim 2 .
10. A transgenic plant grown from the plant cell of claim 9 .
11. Progeny of the plant of claim 10 , wherein the progency comprise the vector of claim 2 .
12. A method for inhibiting the expression of endogenous senescence-induced deoxyhypusine synthase comprising SEQ ID NO:9 in a plant, said method comprising:
(1) integrating into the genome of at least one cell of the plant the vector of claim 2 and
(2) growing said plant, whereby said antisense polynucleotide inhibits expression of senescence-induced deoxyhypusine synthase gene comprising SEQ ID NO:9.
13. The method according to claim 12 wherein said inhibition of expression results in altered senescence of the plant as compared to senescence in a wild type plant.
14. The method according to claim 12 wherein said inhibition of expression results in increased resistance of said plant to environmental stress-induced and/or pathogen-induced senescence as compared to resistance in a wild type plant.
15. The method according to claim 12 wherein said inhibition of expression results in increased biomass of said plant as compared to the biomass of a wild type plant.
16. The method according to claim 12 wherein said inhibition of expression results in delayed fruit softening and spoilage in said plant as compared to fruit softening and spoilage in a wild type plant.
17. The method according to claim 12 wherein said inhibition of expression results in increased seed yield from said plant as compared to seed yield from a wild type plant.
18. The method according to claim 12 wherein the regulatory sequences comprise a constitutive promoter active in the plant.
19. The method according to claim 12 wherein the regulatory sequences comprise a tissue specific promoter active in the plant.
20. The method according to claim 12 wherein the regulatory sequences comprise a senescence-induced promoter active in the plant.
21. The method according to claim 12 wherein said plant is selected from the group consisting of fruit bearing plants and flowering plants.
22. The method according to claim 12 wherein the plant is a tomato.
23. The method according to claim 12 wherein the plant is a flowering plant.
24. A plasmid comprising a replication system functional in a prokaryotic host and the antisense polynucleotide according to claim 1 .
25. A plasmid comprising a replication system functional in Agrobacterium and the antisense polynucleotide according to claim 1 .