Cotton fiber transcriptional factors
Novel DNA constructs are provided which may be used as molecular probes or inserted into a plant host to provide for modification of transcription of a DNA sequence of interest in cotton fiber, particularly in very early fiber development. The DNA constructs comprise a cotton fiber transcriptional initiation regulatory region associated with a gene which is expressed in cotton fiber.
1. A recombinant DNA sequence comprising as operably joined components in the direction of transcription, a cotton fiber transcriptional initiation region functional in a cotton fiber cell and an open reading frame encoding an enzyme in a pigment biosynthesis pathway, wherein said transcriptional initiation region is selected from the group consisting of:
a. nucleotides 65-4163 of SEQ ID NO:7, and
b. SEQ ID NO:15.
2. The DNA sequence according to claim 1 , further comprising a sequence encoding a transit peptide from a plant nuclear-encoded gene.
3. The DNA sequence according to claim 2 , wherein said transit peptide is a plastid transit peptide.
4. The DNA sequence according to claim 1 , wherein said DNA sequence further comprises as an operably joined component a sequence encoding a signal peptide which provides for transport across the rough endoplasmic reticulum.
5. The DNA sequence according to claim 4 , wherein said DNA sequence further comprises as an operably joined component, 3′ to said open reading frame, a sequence encoding a vacuolar targeting signal.
6. The DNA sequence of claim 1 wherein said pigment is melanin or indigo.
7. The DNA sequence of claim 1 wherein said open reading frame is from a bacterial or a plant gene.
8. The DNA sequence of claim 7 wherein said gene is selected from the group consisting of ORF438, tyrA, anthocyanin R gene, anthocyanin C1 gene, pig, and tna.
9. The DNA sequence according to claim 1 , wherein said transcriptional initiation region is obtained by probing a genomic library derived from a plant fiber tissue.
10. A recombinant DNA sequence comprising as operably joined components in the direction of transcription; a transcriptional initiation region functional in a cotton plant cell and an open reading frame encoding an enzyme in a biosynthetic pathway of melanin or indigo, wherein said transcriptional initiation region is selected from the group consisting of:
a. nucleotides 65-4163 of SEQ ID NO:7, and
b. SEQ ID NO:15.
11. The DNA sequence according to claim 10 , further comprising a sequence encoding a transit peptide from a plant nuclear-encoded gene.
12. The DNA sequence according to claim 11 , wherein said transit peptide is a plastid transit peptide.
13. The DNA sequence according to claim 10 , further comprising a sequence encoding a signal peptide which provides for transport across the rough endoplasmic reticulum.
14. The DNA sequence according to claim 13 , wherein said sequence further comprises, 3′ to said open reading frame, a sequence encoding vacuolar targeting signal.
15. The DNA sequence of claim 10 wherein said open reading frame is from a bacterial gene.
16. The DNA sequence of claim 15 wherein said bacterial gene is selected from the group consisting of ORF438, tyrA, pig, and tna.
17. The DNA sequence according to claim 10 wherein said transcriptional initiation region is obtained by probing a genomic library derived from a plant fiber tissue.
18. An isolated DNA sequence comprising a transcriptional initiation region functional in a cotton plant cell, wherein said transcriptional initiation region is selected from the group consisting of:
a. nucleotides 65-4163 of SEQ ID NO:7, and
b. SEQ ID NO:15.
19. The DNA sequence according to claim 18 , further comprising a sequence encoding a transit peptide from a plant nuclear-encoded gene.
20. The DNA sequence according to claim 19 , wherein said transit peptide is a plastid transit peptide.
21. The DNA sequence according to claim 18 , further comprising a sequence encoding a signal peptide which provides for transport across the rough endoplasmic reticulum.
22. The DNA sequence according to claim 21 , wherein said sequence further comprises, 3′ to said open reading frame, a sequence encoding a vacuolar targeting signal.
23. The DNA sequence according to claim 18 wherein said transcriptional initiation region is obtained by probing a genomic library derived from a plant fiber tissue.
24. An isolated DNA sequence comprising the sequence shown in SEQ ID NO: 1.
25. An isolated DNA sequence comprising the sequence shown in SEQ ID NO: 12.
26. An isolated DNA sequence comprising nucleotides 65-4163 of SEQ ID NO: 7.
27. An isolated DNA sequence comprising SEQ ID NO: 15.
28. A DNA construct comprising the DNA sequence of claim 1 .
29. A DNA construct comprising a first and a second DNA sequence according to claim 1 , wherein the open reading frame of said first DNA sequence encodes a different protein than the open reading frame of said second DNA sequence.
30. A recombinant DNA construct comprising nucleotides 65-4163 of SEQ ID NO: 7.
31. A recombinant DNA construct comprising SEQ ID NO: 15.
32. A DNA construct comprising the DNA sequence of claim 18 .
33. The DNA construct of claim 32 wherein said cotton plant cell is a cotton fiber cell.
34. A DNA construct comprising the DNA sequence of claim 10 .
35. The DNA construct of claim 34 wherein said cotton plant cell is a cotton fiber cell.
36. A cotton plant cell comprising the DNA construct of claim 28 .
37. A cotton plant comprising the cell of claim 36 .
38. A cotton plant cell comprising the DNA construct of claim 34 .
39. A cotton plant comprising the plant cell of claim 38 .
40. A method of modifying fiber color in a cotton plant, said method comprising:
transforming a cotton plant cell with a DNA construct comprising a DNA sequence comprising I) a sequence selected from the group consisting of SEQ ID NO:15 and nucleotides 65-4163 of SEQ ID NO:7, and ii) an open reading frame encoding a protein selected from the group consisting of tyrosinase, tryptophanase and indole oxygenase;
regenerating a cotton plant comprising fiber tissue from said cotton plant cell, wherein said fiber tissue comprises a substrate of said protein, and wherein said protein reacts with said substrate to produce a pigment, whereby the color of said fiber is modified.
41. The method of claim 40 wherein said DNA construct further comprises a sequence encoding a transit peptide from a plant nuclear-encoded gene.
42. The method of claim 40 wherein said DNA construct further comprises a sequence encoding a signal peptide which provides for transport across the rough endoplasmic reticulum.
43. A method of modifying fiber color in a cotton plant, said method comprising:
transforming a cotton plant cell with a first DNA construct comprising a DNA sequence comprising I) a sequence selected from the group consisting of SEQ ID NO:15 and nucleotides 65-4163 of SEQ ID NO:7, and ii) an open reading frame encoding a protein selected from the group consisting of tyrosinase, tryptophanase and indole oxygenase;
transforming said cotton plant cell with a second DNA construct according to claim 28 or 29 ;
and regenerating a cotton plant comprising fiber tissue from said cotton plant cell, wherein said fiber tissue comprises a substrate for said protein, and wherein said protein reacts with said substrate to produce a pigment, whereby the color of said fiber is modified, and wherein the open reading frame of the DNA sequence from the first DNA construct encodes a different protein than the open reading frame of the second DNA construct.
44. The method of claim 43 wherein said pigment is melanin and said open reading frames are tyrA and ORF438.
45. The method of claim 43 wherein said pigment is indigo and said open reading frames are tna and pig.
46. The method of claim 43 wherein said pigment is anthoeyanin and said two proteins are the anthocyanin R and C1 proteins.
47. The method of claim 40 wherein said fiber tissue is in the burr.