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Posts Tagged: Drought

Strategies for Managing Crops Under Limited Irrigation Supplies - lessons learned from previous UC ANR drought research

Photo by Jake Walden

Hold on to your hats Klamath Basin Agriculture it sounds like we may be about to take a wild ride into the unknown. The unexpected announcement last week that the Klamath project's water allocation of 140,000 acre feet is uncertain and likely to decrease...

Posted on Tuesday, May 12, 2020 at 3:56 PM
Tags: #drought (0), #irec (0), #irrigation (0), #Tulelake (0)
Focus Area Tags: Agriculture

Genomic gymnastics help sorghum plant survive drought.

Scorching temperatures and parched earth are no match for the sorghum plant — this cereal crop, native to Africa, will remain green and productive, even under conditions that would render other plants brown, brittle and barren.

A new study published this week in the journal Proceedings of the National Academy of Sciences provides the first detailed look at how the plant exercises exquisite control over its genome — switching some genes on and some genes off at the first sign of water scarcity, and again when water returns — to survive when its surroundings turn harsh and arid. 

"With this research, we are laying the groundwork for understanding drought tolerance in cereal crops," said Jeff Dahlberg, UC Cooperative Extension sorghum specialist. Dahlberg, co-author of the study, is also director the UC Kearney Agricultural Research and Extension Center in Parlier, one of nine research and extension centers in California that are part of UC Agriculture and Natural Resources.

Dahlberg said researchers can use the knowledge gained from this project to search for drought genes in other cereal crops.

"That has implications for feeding the world, particularly considering changing climate and weather patterns," he said.

The massive dataset, collected from 400 samples of sorghum plants grown during 17 weeks at Kearney, reveals that the plant modulates the expression of a total of 10,727 genes, or more than 40% of its genome, in response to drought stress. Many of these changes occur within a week of the plant missing a weekly watering or after it is first watered after weeks of no precipitation or irrigation.

Kearney is a 330-acre agriculture research facility in the heart of California's Central Valley, where field-scale, real-world research can be conducted on drought impact on plants and soil microbial communities. The climate is naturally dry throughout the summer, making it ideal to mimic drought conditions by withholding irrigation water.

"People have really shied away from doing these types of experiments in the field and instead conduct them under controlled conditions in the laboratory or greenhouse. But I believe that the investment of time and resources that we put into it is going to pay off, in terms of the quality of the answers that we get, in terms of understanding real-world drought situations," said Peggy Lemaux, UC Cooperative Extension specialist in UC Berkeley's Department of Plant and Microbial Biology and co-author of the paper.

The data was collected as part of the Epigenetic Control of Drought Response in Sorghum, or EPICON, project, a five-year, $12.3 million study into how the sorghum plant is able to survive the stress of drought. The EPICON study is run as a partnership between UC Berkeley researchers and scientists at UC Agriculture and Natural Resources (UC ANR), the Energy Department's Joint Genome Institute (JGI) and that agency's Pacific Northwest National Laboratory (PNNL).

To conduct the research, the team cultivated sorghum plants under three different irrigation conditions — pre-flowering drought, post-flowering drought and controlled applications of water — over three consecutive years at Kearney.

Each week during the growing season, members of the research team carefully harvested samples from the leaves and roots of selected plants and set up a mobile lab in the field where they could rapidly freeze the samples until they were processed for analysis. Then, researchers at JGI sequenced the RNA in each sample to create the transcriptome data, which reveals which of the plant's tens of thousands of genes are being transcribed and used to make proteins at particular times.

Finally, statisticians led by UC Berkeley statistics professor Elizabeth Purdom parsed the massive transcriptome data set to pinpoint how gene expression changed as the plants grew and were subjected to drought or relief from drought conditions.

"We very carefully controlled the watering conditions, and we sampled over the entire developmental timeframe of sorghum, so [researchers] could actually use this data not only to study drought stress, but also to study plant development," Lemaux said.

The researchers noticed a few interesting patterns in the transcriptome data. First, they found that a set of genes known to help the plant foster symbiotic relationships with a type of fungus that lives around its roots was switched off in drought conditions. This set of genes exhibited the most dramatic changes in gene activity that they observed.

"That was interesting, because it hinted that the plants were turning off these associations [with fungi] when they were dry," said John Vogel, a staff scientist at JGI and co-author of the paper. "That meshed well with findings that showed that the abundance of these fungi around the roots was decreasing at the same time."

Second, they noticed that certain genes known to be involved with photosynthesis were also turned off in response to drought and turned up during drought recovery. While the team doesn't yet know why these changes might help the plant, they provide interesting clues for follow-up.

The data in the current paper show the plant's transcriptome under both normal conditions and drought conditions over the course of a single growing season. In the future, the team also plans to publish data from the other two years of the experiment, as well as proteomic and metabolomic data.

Nelle Varoquaux and Cheng Gao of UC Berkeley and Benjamin Cole of JGI are co-first-authors of the study. Other co-authors include Grady Pierroz, Christopher R. Baker, Dhruv Patel, Mary Madera, Tim Jeffers, Judith A. Owiti, Stephanie DeGraaf, Ling Xu, Krishna K. Niyogi, Devin Coleman-Derr and John W. Taylor of UC Berkeley; Joy Hollingsworth, Julie Sievert and Jeffery Dahlberg of UC ANR KARE; Yuko Yoshinaga, Vasanth R. Singan, Matthew J. Blow, Axel Visel and Ronan O'Malley of JGI; Maria J. Harrison of the Boyce Thompson Institute; Christer Jansson of PNNL and Robert Hutmacher of UC ANR.

This research was funded in part by the Department of Energy (DOE) grant DE-SC001408; the Gordon and Betty Moore Foundation grant GBMF3834; the Alfred P. Sloan Foundation grant
2013-10-27; L'Ecole NormaleSupérieure-Capital Fund Management data science chair and the DOE's Office of Biological and Environmental Research grant DE-SC0012460. Work conducted by the DOE Joint Genome Institute is supported by the Office of Science of the DOE contract DE-AC02-05CH11231.

UC Agriculture and Natural Resources brings the power of UC research in agriculture, natural resources, nutrition and youth development to local communities to improve the lives of all Californians. Learn more at



Jeff Dahlberg, UC Cooperative Extension specialist at the UC Kearney Agricultural Research and Extension Center,

Peggy Lemaux, cooperative extension specialist at UC Berkeley's Department of Plant and Microbial Biology,

John Vogel, staff scientist, DOE Joint Genome Institute,

EPICON sorghum field. Understanding how sorghum survives harsh conditions could help researchers identify cereal crop cultivars that are more resilient to climate change. (Photo: Peggy Lemaux)


Posted on Friday, January 10, 2020 at 2:02 PM
Tags: Drought (22), Grain (1), Sorghum (9)
Focus Area Tags: Agriculture, Environment, Food

USDA Informational Meeting Tuesday, May 15

The Farm Service Agency offices in Klamath, Modoc and Siskiyou counties are planning an informational meeting on Tuesday May 15. The meeting will begin at 10 a.m. at the Merrill Civic Center 365 Front Street, Merrill Oregon. Topics include reporting...

Posted on Wednesday, May 9, 2018 at 9:43 AM
Tags: #disaster (0), #drought (0), #Klamath (0), #Klamath Basin (0), #Modoc (0), #Siskiyou (0), #Tulelake (0)
Focus Area Tags: Agriculture

Drones are used for research and land management; do you want to learn how to use drones?

Jeffery Dahlberg, director of UC ANR Kearney Agricultural Research & Extension Center (KARE), specializing in plant breeding and genetics, is working with drones to collect data for one of his sorghum programs. Work will continue the development of field scale drought nurseries at both KARE and West Side Research & Extension Center (WSREC) under a DOE ARPA-e funded project that utilizes drone technology to phenotype sorghum lines on a weekly basis as they are stressed under pre- and post-flowering drought stress. Research will continue this coming summer to gather additional phenotypic data, along with heat stress measurements and soil moisture monitoring. These nurseries are part of an effort to identify genes that are expressed under different field stress conditions and relate them to sorghum's ability to withstand and recover from stress. 

If you are interested in learning how to use drones for research and land management, you may want to explore attending the UCANR Informatics and GIS Program's  Dronecamp July 25-27, 2017 at UCANR in Davis, Calif., the application period is March 1 – April 15, 2017. Dronecamp costs $500 for UC affiliates (UC employees and enrolled students), and $900 for non-UC participants. Dronecomp is designed for participants with little or no experience in drone technology, and want to learn how to use drones for mapping applications. The intensive workshop covers drone science; safety and regulations; mission planning; flight operations; data processing; data analysis; visualization; and the latest trends and technology. Read more.

A drone collecting data from a drought stressed sorghum nursery.

Posted on Thursday, March 23, 2017 at 4:36 PM
Tags: drones (1), drought (22), sorghum (9)

Research Spotlight: Foothills irrigation creates wetlands and sustains them in drought, benefitting birds

An unintentional wetland created by irrigation runoff at SFREC (left) and an intentionally created irrigated wetland on Spenceville SWA (right).

After five years, the northern Sierra Nevadas have finally been moved out of the “severe drought” category by the US Drought monitor following a promisingly rainy start to the 2017 water year. This is not only good news for our agricultural...

Posted on Tuesday, January 10, 2017 at 10:42 AM
  • Author: Nathan Van Schmidt
Tags: Birds (2), Black Rail (1), Drought (22), Irrigation (12), Wetlands (1)

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