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Fungal isolates and their use to confer salinity and drought tolerance in plants

A technology of isolates and tolerance, applied in the field of endophytic fungi) to treat plants to achieve the effect of increasing yield

Inactive Publication Date: 2010-12-15
MONTANA STATE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While water and soil management practices have driven improved agricultural production on soils marginalized by salinity, currently available strategies for enhancing crop salt tolerance remain severely flawed

Method used

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  • Fungal isolates and their use to confer salinity and drought tolerance in plants
  • Fungal isolates and their use to confer salinity and drought tolerance in plants
  • Fungal isolates and their use to confer salinity and drought tolerance in plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Assessment of coastal habitats - the role of Fusarium in conferring salt tolerance

[0056] The flora on Washington State's Puget Sound beaches is often dominated by Limegrass (Dune Grass). In this habitat, plants are exposed to seawater during high tides, and summers are often very dry. These plants are annual species that reach high population densities and remain green until they begin to senescence in the fall. 200 dunegrass individuals were collected from 4 geographically distinct locations (>16 km) in Puget Sound and found to be colonized by a dominant class 2 fungal endophyte representing 95% of all fungi isolated. The endophyte was identified as Fusarium cumulus using morphological and molecular techniques and isolated from plant roots, crown and lower stems as previously described (Redman et al., 2002, Symbiosis 32:55- 70).

[0057] Based on the abiotic stresses imposed in coastal habitats, we tested the ability of Fusarium eccentricum (isolate FcRed1 ) to c...

Embodiment 2

[0071] Assessment of Geothermal Soil Habitats

[0072] The present inventors previously reported that a fungal endophyte (Curvularia sp.) is responsible for the thermal tolerance of the monocot Dichanthelium lanuginosum (panicum) thriving in the geothermal soils of Yellowstone National Park (Redman et al., 2002, Science, see above). The endophyte was identified as Curvularia protuberate using morphological and molecular techniques (Methods). Studies similar to those discussed above were performed with an isolate of Curvularia angioides (CpMH206) obtained from the ATCC, derived from grasses grown in non-geothermal habitats in Scotland, UK. A comparative study with a Curvularia tubules isolate (Cp4666D) and CpMH206 from Panicum revealed that both isolates colonized tomato and Panicum equally (Table 2). While Cp4666D confers heat tolerance to both millet and tomato plants, CpMH206 does not ( figure 2 a). To ensure that CpMH206 communicates symbiotically with plants and to de...

Embodiment 3

[0074] Assessment of agricultural habitats

[0075] Fungi from the genus Colletotrichum are known as plant pathogens, but they can still express a symbiotic lifestyle, depending on the host they colonize (Redman et al., 2001, New Phytol., see above). For example, C. magna isolate CmL2.5 is a virulent pathogen of cucurbit, but colonizes tomato asymptomatically. Depending on the tomato genotype, CmL2.5 increases growth rate and / or fruit yield, and confers drought tolerance and / or disease resistance against virulent pathogens (Redman et al., 2002, Science, supra; Redman et al., 2001, New Phytol., supra). Interestingly, Nephila sp. did not confer salt or heat tolerance to tomatoes or cucurbits, while the Curvularia and Fusarium isolates described above did not confer disease resistance (not shown). Thus, N. spinosa species are adapted to stress (high disease pressure) specific agricultural habitats and confer disease resistance on plant hosts. As seen with the Curvularia and F...

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Abstract

The present invention is directed to methods and compositions of endophytic fungi that confer stress tolerance to inoculated plants, including both monocots and dicots. In particular, Fusarium species, isolated from the dunegrass, Leymus mollis, growing in plant communities on Puget Sound beaches of Washington State. Upon inoculating a target plant or plant part with the endophytic fungi, the resulting plant shows stress tolerance, particularly drought and salinity tolerance.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 60 / 950,755, filed July 19, 2007, the entire contents of which are hereby incorporated by reference for all purposes. [0003] Statement of Rights to Inventions Made Under Federally Sponsored Research [0004] The U.S. government has a paid license to this invention and has the right to require the patentee to license others on reasonable terms in limited circumstances, such as under NSF Grant No. 0414463 and the U.S. / Israel Binational Agricultural Research and Development Fund under the terms of appropriation number 3260-01C. [0005] Description of text files submitted electronically [0006] This article incorporates in its entirety by reference the contents of the text file submitted electronically with this article: Sequence Listing in Computer Readable Copy (File Name: MONT 094 01WOSeqList_ST25.txt, Data Recorded July 21, 2008, File Size 2 kiloby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N63/04A01N63/30
CPCA01N63/04A01N63/30A01N2300/00
Inventor 雷吉娜·S·雷德曼拉塞尔·J·罗德里格斯
Owner MONTANA STATE UNIVERSITY
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