Fungal endophytes for improved crop yields and protection from pests

• US 9,277,751 B2
• Filed: 11/06/2014
• Issued: 03/08/2016
• Est. Priority Date: 11/06/2013
• Status: Active Grant

• Current Assignee: Texas A&M University System
• Original Assignee: Texas A&M University System
• Inventors: Sword, Gregory A.
• Primary Examiner(s): Pryor, Alton
• Application Number:
  US14/535,292
• Publication Number:
  US 20150126365A1
• Time in Patent Office: 488 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: A01N 63/30 Microbial fungi; Substances produced thereby or obtained therefrom

Abstract

The invention provides a synthetic combination of a crop and at least one fungal endophyte, wherein the crop is a host plant of the endophyte. Provided are also methods and compositions for producing such synthetic combinations. The endophyte reproduces and enhances the agronomic characteristics of the crop. Methods for inoculating the host plant with the endophyte, for propagating the host-endophyte combination, and for detecting the presence of the endophyte and of its metabolites within a host plant are also described.

Claims

1. A method for improving a trait in a cotton plant, the method comprising:

contacting a seed of said cotton plant with a formulation comprising purified filamentous, spore-forming, facultative fungal endophytes of at least one species,

wherein the facultative fungal endophytes are Dothideomycetes capable of producing substances that are beneficial to plants or detrimental to pests or both,

and are present in the formulation in an amount effective to decrease colonization frequencies of endophytes of genus Alternaria native to the cotton plant and to provide a benefit to the cotton plant compared to a cotton plant grown from a seed untreated with the Dothideomycetes facultative fungal endophytes,

wherein the benefit is selected from the group consisting of reduced nematode reproduction, reduced insect infestation, increased boll retention, increased yield, reduction of yield loss, increased growth, modulated phytohormone, enhanced resistance to drought stress, enhanced resistance to cold stress, enhanced resistance to heat stress, enhanced resistance to nutrient deficiency, enhanced resistance to salt toxicity, enhanced resistance to aluminum toxicity, enhanced resistance to grazing by herbivores, enhanced resistance to nematode infection, enhanced resistance to fungal infection, enhanced resistance to bacterial infection, enhanced resistance to viral infection and pest reduction.

2. The method of claim 1, wherein the facultative fungal endophyte is native to the cotton plant.

3. The method of claim 1, wherein the benefit is reduced nematode production.

4. The method of claim 1, wherein the benefit is reduced insect infestation.

5. The method of claim 1, wherein the benefit is increased boll retention.

6. The method of claim 1, wherein the benefit is increased yield by about 5%.

7. The method of claim 1, wherein the benefit is a reduction of yield loss by more than 5%.

8. The method of claim 1, wherein the benefit is enhanced resistance to drought stress.

9. The method of claim 1, wherein the formulation contains at least 100 (10^2) spores/ml or 100,000 (10^5) spores/g dry weight of the facultative fungal endophytes.

10. The method of claim 1, wherein the benefit is pest reduction.

11. The method of claim 10, wherein the pest is selected from the group consisting of a root knot nematode, an aphid, a lygus bug, a stink bug, or combinations thereof.

12. The method of claim 1, wherein the formulation comprises at least 2 species of facultative fungal endophytes.

13. The method of claim 1, wherein the formulation contains at least 1000 (10^3) spores/ml or 1,000,000 (10^6) spores/g dry weight of the facultative fungal endophytes.

14. The method of claim 1, wherein the formulation contains at least 1,000,000 (10^6) spores/ml of the facultative fungal endophytes.

15. The method of claim 6, wherein yield is increased by about 10%.

16. The method of claim 7, wherein yield loss is decreased by about 10%.

17. The method of claim 1, wherein the formulation contains at least 100 (10^2) spores/ml or 100,000 (10^5) spores/g dry weight of the facultative fungal endophytes and yield is increased by about 5%.

18. A synthetic combination of a cotton seed and purified filamentous, spore-forming facultative fungal endophytes of at least one species,

wherein the facultative fungal endophytes are Dothideomycetes capable of producing substances that are beneficial to plants or detrimental to pests or both

and are present in the synthetic combination in an amount effective to decrease the colonization frequencies of genus Alternaria native to the cotton plant grown from the seed and to provide a benefit to the cotton plant compared to a cotton plant grown from a seed untreated with the Dothideomycetes facultative fungal endophytes

wherein the benefit is selected from the group consisting of reduced nematode reproduction, reduced insect infestation, increased boll retention, increased yield, reduction of yield loss, increased growth, modulated phytohormone, enhanced resistance to drought stress, enhanced resistance to cold stress, enhanced resistance to heat stress, enhanced resistance to nutrient deficiency, enhanced resistance to salt toxicity, enhanced resistance to aluminum toxicity, enhanced resistance to grazing by herbivores, enhanced resistance to nematode infection, enhanced resistance to fungal infection, enhanced resistance to bacterial infection, enhanced resistance to viral infection and pest reduction.

19. The synthetic combination of claim 18, wherein the facultative fungal endophytes are in spore form.

20. The synthetic combination of claim 18, wherein the benefit is reduced nematode production.

21. The synthetic combination of claim 18, wherein the benefit is enhanced resistance to drought stress.

22. The synthetic combination of claim 18, wherein the benefit is reduced insect infestation.

23. The synthetic combination of claim 18, comprising at least 2 species of facultative endophytes.

24. The synthetic combination of claim 18, wherein the benefit is increased yield by about 5%.

25. The synthetic combination of claim 18, wherein the benefit is a reduction of yield loss by more than 5%.

26. The synthetic combination of claim 18, wherein the facultative fungal endophyte is native to the cotton plant grown from the seed.

27. The synthetic combination of claim 18, wherein the facultative fungal endophytes are present at a concentration of at least 100 (10^2) spores/seed on the surface of the seed.

28. The synthetic combination of claim 18, wherein the facultative fungal endophytes are present at a concentration of at least 1,000 (10^3) spores/seed on the surface of the seed.

29. The synthetic combination of claim 18, wherein the facultative fungal endophytes are present at a concentration of at least 10,000 (10^4) spores/seed on the surface of the seed.

30. The synthetic combination of claim 24, wherein yield is increased by about 10%.

31. The synthetic combination of claim 25, wherein yield loss is reduced by about 10%.

32. The synthetic combination of claim 18, wherein the benefit is increased boll retention.

33. The synthetic combination of claim 18, wherein the benefit is pest reduction.

34. The synthetic combination of claim 33, wherein the pest is selected from the group consisting of a root knot nematode, an aphid, a lygus bug, and a stink bug.

35. The synthetic combination of claim 18, wherein the facultative fungal endophytes are present at a concentration of at least 100 (10^2) spores/seed on the surface of the seed and the yield is increased by about 5%.