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Title: Carbon source-sink limitations differ between two species with contrasting growth strategies: Source-sink limitations vary with growth strategy

Journal Article · · Plant, Cell and Environment
DOI:https://doi.org/10.1111/pce.12801· OSTI ID:1336088
 [1];  [2];  [1];  [1]
  1. Univ. of Sheffield (United Kingdom). Dept. of Animal and Plant Sciences
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.

When we understand how carbon source and sink strengths limit plant growth we realized how critical the knowledge gap is in hindering efforts to maximize crop yield. Here, we investigated how differences in growth rate arise from source–sink limitations, using a model system comparing a fast-growing domesticated annual barley (Hordeum vulgare cv. NFC Tipple) with a slow-growing wild perennial relative (Hordeum bulbosum). Source strength was manipulated by growing plants at sub-ambient and elevated CO2 concentrations ([CO2]). Limitations on vegetative growth imposed by source and sink were diagnosed by measuring relative growth rate, developmental plasticity, photosynthesis and major carbon and nitrogen metabolite pools. Growth was sink limited in the annual but source limited in the perennial. RGR and carbon acquisition were higher in the annual, but photosynthesis responded weakly to elevated [CO2] indicating that source strength was near maximal at current [CO2]. In contrast, photosynthetic rate and sink development responded strongly to elevated [CO2] in the perennial, indicating significant source limitation. Sink limitation was avoided in the perennial by high sink plasticity: a marked increase in tillering and root:shoot ratio at elevated [CO2], and lower non-structural carbohydrate accumulation. Finally, by alleviating sink limitation during vegetative development could be important for maximizing growth of elite cereals under future elevated [CO2].

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC00112704
OSTI ID:
1336088
Report Number(s):
BNL-112493-2016-JA; R&D Project: 2016-BNL-EE630EECA-Budg; KP1701000
Journal Information:
Plant, Cell and Environment, Vol. 39, Issue 11; ISSN 0140-7791
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (11)

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Stress-induced senescence and plant tolerance to abiotic stress journal July 2017
Nutrient sink limitation constrains growth in two barley species with contrasting growth strategies journal November 2018
Sucrose promotes etiolated stem branching through activation of cytokinin accumulation followed by vacuolar invertase activity posted_content January 2020
Genotypic variation in source and sink traits affects the response of photosynthesis and growth to elevated atmospheric CO 2 journal December 2019
Hydraulic Traits Emerge as Relevant Determinants of Growth Patterns in Wild Olive Genotypes Under Water Stress journal March 2019
Effects of Elevated CO2 on Wheat Yield: Non-Linear Response and Relation to Site Productivity journal May 2019
Increased biomass accumulation in maize grown in mixed nitrogen supply is mediated by auxin synthesis journal February 2019
Is triose phosphate utilization involved in the feedback inhibition of photosynthesis in rice under conditions of sink limitation? journal July 2019
The potential role of sucrose transport gene expression in the photosynthetic and yield response of rice cultivars to future CO 2 concentration journal May 2019
The Role of Sink Strength and Nitrogen Availability in the Down-Regulation of Photosynthetic Capacity in Field-Grown Nicotiana tabacum L. at Elevated CO2 Concentration journal June 2017