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Title: Growth and physiological responses of isohydric and anisohydric poplars to drought

Journal Article · · Journal of Experimental Botany
DOI:https://doi.org/10.1093/jxb/erv195· OSTI ID:1343100
 [1];  [2];  [3];  [4];  [5]
  1. Hebrew Univ. of Jerusalem (Israel). Inst. of Plant Sciences and Genetics in Agriculture
  2. Bordeaux Sciences Agro UMR INRA-ISPA, Gradignan (France); North Carolina State Univ., Raleigh, NC (United States); Duke Univ., Durham, NC (United States)
  3. Duke Univ., Durham, NC (United States); Swedish University of Agricultural Sciences (SLU), Umea (Sweden)
  4. Duke Univ., Durham, NC (United States); Univ. of Western Ontario, London, ON (Canada)
  5. Hebrew Univ. of Jerusalem (Israel). Inst. of Plant Sciences and Genetics in Agricultur

Understanding how different plants prioritize carbon gain and drought vulnerability under a variable water supply is important for predicting which trees will maximize woody biomass production under different environmental conditions. Here, Populus balsamifera (BS, isohydric genotype), P. simonii (SI, previously uncharacterized stomatal behaviour), and their cross, P. balsamifera x simonii (BSxSI, anisohydric genotype) were studied to assess the physiological basis for biomass accumulation and water-use efficiency across a range of water availabilities. Under ample water, whole plant stomatal conductance (gs), transpiration (E), and growth rates were higher in anisohydric genotypes (SI and BSxSI) than in isohydric poplars (BS). Under drought, all genotypes regulated the leaf to stem water potential gradient via changes in gs, synchronizing leaf hydraulic conductance (Kleaf) and E: isohydric plants reduced Kleaf, gs, and E, whereas anisohydric genotypes maintained high Kleaf and E, which reduced both leaf and stem water potentials. Nevertheless, SI poplars reduced their plant hydraulic conductance (Kplant) during water stress and, unlike, BSxSI plants, recovered rapidly from drought. Low gs of the isohydric BS under drought reduced CO2 assimilation rates and biomass potential under moderate water stress. While anisohydric genotypes had the fastest growth under ample water and higher photosynthetic rates under increasing water stress, isohydric poplars had higher water-use efficiency. Overall, the results indicate three strategies for how closely related biomass species deal with water stress: survival-isohydric (BS), sensitive-anisohydric (BSxSI), and resilience-anisohydric (SI). Lastly, we discuss implications for woody biomass growth, water-use efficiency, and survival under variable environmental conditions.

Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE; US–Israeli Bi-national Science Foundation; National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); USDA
Grant/Contract Number:
SC0006967
OSTI ID:
1343100
Journal Information:
Journal of Experimental Botany, Vol. 66, Issue 14; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 99 works
Citation information provided by
Web of Science

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Cited By (25)

Rainfall seasonality and drought performance shape the distribution of tropical tree species in Ghana journal July 2018
Contrasting strategies of hydraulic control in two codominant temperate tree species journal December 2016
Structural and anatomical responses of Pinus sylvestris and Tilia platyphyllos seedlings exposed to water shortage journal May 2018
Vapour pressure deficit control in relation to water transport and water productivity in greenhouse tomato production during summer journal March 2017
The advantages of functional phenotyping in pre-field screening for drought-tolerant crops journal January 2017
Information Underload: Ecological Complexity, Incomplete Knowledge, and Data Deficits Create Challenges for the Assisted Migration of Forest Trees journal February 2018
Can sugar metabolism in the cambial region explain the water deficit tolerance in poplar? journal May 2018
Transcriptome analysis of Pinus halepensis under drought stress and during recovery journal November 2017
Less safety for more efficiency: water relations and hydraulics of the invasive tree Ailanthus altissima (Mill.) Swingle compared with native Fraxinus ornus L. journal July 2018
Metrics and proxies for stringency of regulation of plant water status (iso/anisohydry): a global data set reveals coordination and trade-offs among water transport traits journal September 2018
Differences in isoprenoid-mediated energy dissipation pathways between coastal and interior Douglas-fir seedlings in response to drought journal October 2019
More than iso/anisohydry: Hydroscapes integrate plant water use and drought tolerance traits in 10 eucalypt species from contrasting climates journal April 2019
Global variations in ecosystem-scale isohydricity journal July 2016
Genotypic variation in transpiration of coppiced poplar during the third rotation of a short-rotation bio-energy culture journal June 2018
Linking variation in intrinsic water-use efficiency to isohydricity: a comparison at multiple spatiotemporal scales journal August 2018
Plant hydraulics as a central hub integrating plant and ecosystem function: meeting report for ‘Emerging Frontiers in Plant Hydraulics’ (Washington, DC, May 2015): Plant hydraulics as a central hub journal July 2016
Aquaporin regulation in roots controls plant hydraulic conductance, stomatal conductance, and leaf water potential in Pinus radiata under water stress: Aquaporin activity regulates stomatal conductace journal November 2018
Beyond soil water potential: An expanded view on isohydricity including land–atmosphere interactions and phenology journal February 2019
Chemical and isotopic markers detect water deficit and its influence on nutrient allocation in Phaseolus vulgaris journal February 2019
Improving water use efficiency by changing hydraulic and stomatal characteristics in soybean exposed to drought: the involvement of nitric oxide journal June 2019
Variation in Ecophysiological Traits and Drought Tolerance of Beech (Fagus sylvatica L.) Seedlings from Different Populations journal June 2016
UAV-Based Thermal Imaging for High-Throughput Field Phenotyping of Black Poplar Response to Drought journal September 2017
Response of Mid-Rotation Loblolly Pine (Pinus taeda L.) Physiology and Productivity to Sustained, Moderate Drought on the Western Edge of the Range journal September 2016
Temporal network analysis identifies early physiological and transcriptomic indicators of mild drought in Brassica rapa journal August 2017
Transpiration Response of Cotton to Vapor Pressure Deficit and Its Relationship With Stomatal Traits journal October 2018

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