Response of Guayule to Alternating Periods of Low and High Moisture Stresses

Benedict, H. M.; McRary, W. L.; Slattery, Michael C.

doi:10.1086/335441

Cited by 31 publications

(11 citation statements)

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“…The biological purpose for the production, accumulation, and subsequent storage of rubber in guayule is unclear (Backhaus, 1985). However, rubber biosynthesis and deposition appears to be dependent on abiotic stressors such as drought and temperature, which have been shown to have an effect on several guayule phenotypes including vegetative growth rates and antioxidant metabolism (Allen et al, 1987;Benedict et al, 1947;Benzioni et al, 1989;Downes and Tonnet, 1985;Nakayama and Bucks, 1984;Ramachandra Reddy and Rama Das, 1988;Sundar, D. and Ramachandra Reddy, 2000;Sundar et al, 2004;Veatch-Blohm et al, 2006). In addition, several studies have demonstrated a relationship between these abiotic factors and rubber yields; therefore, much interest lies in understanding the connection between rubber accumulation and environmental conditions (Ramachandra Reddy and Rama Das, 1988;Sundar, D. and Ramachandra Reddy, 2000;Veatch-Blohm et al, 2006 (Stonebloom andScheller 2019)).…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic and evolutionary analysis of the mechanisms by which P. argentatum, a rubber producing perennial, responds to drought

Nelson

Ponciano

McMahan

et al. 2019

Preprint

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Background Guayule (Parthenium argentatum Gray) is a drought tolerant, rubber producing perennial shrub native to northern Mexico and the US Southwest. Hevea brasiliensis, currently the world’s only source of natural rubber, is grown as a monoculture, leaving it vulnerable to both biotic and abiotic stressors. Isolation of rubber from guayule occurs by mechanical harvesting of the entire plant. It has been reported that environmental conditions leading up to harvest have a profound impact on rubber yield. The link between rubber biosynthesis and drought, a common environmental condition in guayule’s native habitat, is currently unclear. Results We took a transcriptomic and comparative genomic approach to determine how drought impacts rubber biosynthesis in guayule. We compared transcriptional profiles of stem tissue, the location of guayule rubber biosynthesis, collected from field-grown plants subjected to water-deficit (drought) and well-watered (control) conditions. Plants subjected to the imposed drought conditions displayed an increase in production of transcripts associated with defense responses and water homeostasis, and a decrease in transcripts associated with rubber biosynthesis. An evolutionary and comparative analysis of stress-response transcripts suggests that more anciently duplicated transcripts shared among the Asteraceae, rather than recently derived duplicates, are contributing to the drought response observed in guayule. In addition, we identified several deeply conserved long non-coding RNAs (lncRNAs) containing microRNA binding motifs. One lncRNA in particular, with origins at the base of Asteraceae, may be regulating the vegetative to reproductive transition observed in water-stressed guayule by acting as a miRNA sponge for miR166. Conclusions These data represent the first genomic analyses of how guayule responds to drought like conditions in agricultural production settings. We identified an inverse relationship between stress-responsive transcripts and those associated with precursor pathways to rubber biosynthesis suggesting a physiological trade-off between maintaining homeostasis and plant productivity. We also identify a number of regulators of abiotic responses, including transcription factors and lncRNAs, that are strong candidates for future projects aimed at modulating rubber biosynthesis under water-limiting conditions common to guayules’ native production environment.

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Section: Introductionmentioning

confidence: 99%

Transcriptomic and evolutionary analysis of the mechanisms by which P. argentatum, a rubber producing perennial, responds to drought

Nelson

Ponciano

McMahan

et al. 2019

Preprint

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“…Water stress initiates a number of changes within the plant, many of which contribute to guayule's drought tolerance. Water‐stressed plants have less leaf lobing, smaller leaves, and smaller leaf area than well‐watered plants (Benedict et al, 1947; Bucks et al, 1985a, 1985b; Benzioni et al, 1989). Carbon exchange (often reported as photosynthesis) measurements taken about 2 h before solar noon on whole plants showed no difference in the C exchange rate between well‐watered and water‐stressed plants (Allen et al, 1987; Allen and Nakayama, 1988).…”

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“…Water requirements for guayule have been studied extensively during every major period of guayule research (Ray et al, 2005), from the Emergency Rubber Project (Addicott and Pankhurst, 1944; Kelley et al, 1945; Hunter and Kelley, 1946; Benedict et al, 1947) to studies in the 1980s (Bucks et al, 1985a, 1985b, 1985c; Miyamoto and Bucks, 1985). The relationship of resin concentration to the amount of irrigation is unclear.…”

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confidence: 99%

“…The relationship of resin concentration to the amount of irrigation is unclear. Some field studies have shown that the amount of irrigation does not affect resin concentration (Benedict et al, 1947; Allen et al, 1987), while others have shown that resin concentration increases with increasing irrigation (Bucks et al, 1985b; Miyamoto and Bucks, 1985; Benzioni et al, 1989); however, resin yield is directly related to plant biomass and increases with increasing irrigation (Bucks et al, 1985b; Ehrler et al, 1985). Field studies have shown that, as the application of irrigation water increases, rubber concentration within the plant decreases but rubber yields increase (Fangmeier et al, 1985; Miyamoto and Bucks, 1985; Mills et al, 1990).…”

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Water‐Stress‐Induced Changes in Resin and Rubber Concentration and Distribution in Greenhouse‐Grown Guayule

2006

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Guayule (Parthenium argentatum A. Gray) is naturally subject to periods of water stress in its native habitat. It has been shown that, under cultivation, rubber yields increase with increasing irrigation, but rubber concentration per plant decreases. The effect of irrigation on resin concentration is unclear. The purpose of this study was to understand how resin concentration is affected by water stress, and why water stress increases rubber concentration. Greenhouse-grown guayule plants were subjected to water stress in four experiments, each of 3 mo duration. Two experiments were conducted in the summer, the active growth period, and two experiments were conducted in the winter. The water-stressed plants were irrigated when the average soil water potential reached either 20.6 MPa (first summer experiment) or 20.3 MPa (all subsequent experiments). Water-stress effects were monitored by measuring growth, C exchange, biomass, and resin and rubber production. Water-stressed plants had lower C exchange, growth, and leaf-to-stem ratio than well-watered plants. Resin concentration did not respond consistently to water stress. Rubber concentration was generally higher in the water-stressed plants than in the well-watered plants as a result of decreased leaf biomass in both the summer (33 vs. 45 g kg 21 ) and winter (36 vs. 52 g kg 21 ) and decreased stem diameter in the summer (8.1 vs. 11.0 mm). Rubber is deposited mainly in the bark; therefore, reduced leaf biomass and stem diameter contribute to higher rubber concentration in the water-stressed plants by increasing the relative amount of bark.

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“…Most of the literature pertaining to the effects of soil moisture and aeration on plant growth and metabolism has been reviewed by Richards and Wadleigh ( 9), Russell (10), and Kramer (8). Several investigators (1,5,6,10) have shown that certain growth processes decrease with increasing soil moisture tension or osmotic stress. Others (2,3,4) have shown that various growth and physiological processes are affected by the oxygen concentration of the medium.…”

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Effect of Soil Moisture Tension and Oxygen Concentration on the Growth of Corn Roots¹

Gingrich¹,

Russell

1956

Agronomy Journal

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Response of Guayule to Alternating Periods of Low and High Moisture Stresses

Cited by 31 publications

References 3 publications

Transcriptomic and evolutionary analysis of the mechanisms by which P. argentatum, a rubber producing perennial, responds to drought

Transcriptomic and evolutionary analysis of the mechanisms by which P. argentatum, a rubber producing perennial, responds to drought

Water‐Stress‐Induced Changes in Resin and Rubber Concentration and Distribution in Greenhouse‐Grown Guayule

Effect of Soil Moisture Tension and Oxygen Concentration on the Growth of Corn Roots¹

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Response of Guayule to Alternating Periods of Low and High Moisture Stresses

Cited by 31 publications

References 3 publications

Transcriptomic and evolutionary analysis of the mechanisms by which P. argentatum, a rubber producing perennial, responds to drought

Transcriptomic and evolutionary analysis of the mechanisms by which P. argentatum, a rubber producing perennial, responds to drought

Water‐Stress‐Induced Changes in Resin and Rubber Concentration and Distribution in Greenhouse‐Grown Guayule

Effect of Soil Moisture Tension and Oxygen Concentration on the Growth of Corn Roots1

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Effect of Soil Moisture Tension and Oxygen Concentration on the Growth of Corn Roots¹