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ClaimsWhat is claimed is: 1. An isolated nucleic acid molecule comprising a nucleotide sequence selected from the group consisting of:
2. An expression cassette comprising the nucleic acid molecule of claim 1, said nucleotide sequence operably linked to a promoter that drives expression in a plant cell. 3. The expression cassette of claim 2, wherein said promoter is selected from the group consisting of tissue-preferred, constitutive, chemically regulatable, and pathogen-inducible promoters. 4. A transformed plant having stably incorporated into its genome a nucleic acid molecule operably linked to a promoter that drives expression in a plant cell, wherein said nucleic acid molecule comprises a nucleotide sequence selected from the group consisting of:
5. The plant of claim 4, wherein said promoter is selected from the group consisting of tissue-preferred, constitutive, chemically regulatable, and pathogen-inducible promoters. 6. The plant of claim 4, wherein said nucleic acid molecule is operably linked to said promoter in the antisense orientation. 7. The plant of claim 4, wherein said plant is a monocot. 8. The plant of claim 7, wherein said monocot is selected from the group consisting of maize, wheat, rice, sorghum, rye, millet and barley. 9. The plant of claim 4, wherein said plant is a dicot. 10. The plant of claim 9, wherein said dicot is selected from the group consisting of soybeans, sunflowers, safflowers, alfalfa, Brassica sp., cotton, peanuts and fruit trees. 11. Transformed seed of the plant of claim 4. 12. Transformed seed of the plant of claim 5. 13. Transformed seed of the plant of claim 6. 14. Transformed seed of the plant of claim 7. 15. Transformed seed of the plant of claim 8. 16. Transformed seed of the plant of claim 9. 17. Transformed seed of the plant of claim 10. 18. A method for modifying the growth of a plant, said method comprising transforming a plant with a nucleic acid molecule encoding a P-glycoprotein, said nucleic acid molecule operably linked a promoter that drives expression of said nucleic acid molecule in said plant, said nucleic acid molecule comprising a nucleotide sequence selected from the group consisting of:
19. The method of claim 18, wherein said nucleic molecule is operably linked to said promoter in the antisense orientation. 20. The method of claim 18, wherein the height of said plant is reduced. 21. The method of claim 18, wherein said plant is a monocot. 22. The method of claim 18, wherein said monocot is selected from the group consisting of maize, wheat, rice, sorghum, rye, millet and barley. 23. A transformed plant cell having stably incorporated into its genome a nucleic acid molecule operably linked to a promoter that drives expression in a plant cell, wherein said nucleic acid molecule comprises a nucleotide sequence selected from the group consisting of:
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