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WUE Does it really support plant production under limited water supply?

. WUE Does it really support plant production under limited water supply?. Important Note: Always wait a few seconds before you move to the next slide. Developing ‘Less Thirsty’ Crops : How biotech can help us get more crop per drop. C. S. Prakash Tuskegee University, Alabama, USA

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WUE Does it really support plant production under limited water supply?

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  1. . WUE Does it really support plant production under limited water supply?

  2. Important Note: Always wait a few seconds before you move to the next slide

  3. Developing ‘Less Thirsty’ Crops: How biotech can help us get more crop per drop C. S. Prakash Tuskegee University, Alabama, USA prakash@tuskegee.edu www.agbioworld.org

  4. Remember WUE was developed as a tool to asses irrigation efficiency and to prevent wastefull water use.

  5. WUE 0.0050 Stress Control 0.0045 0.0040 0.0035 0.0030 0.0025 0.0020 Susceptible Resistant WATER-USE (g) 8000 BIOMASS (g) 25 20 6000 15 4000 10 2000 5 Susceptible Resistant Susceptible Resistant (A study with drought susceptible and resistant varieties of wheat) The drought resistant plant used more water and produced more while the less productive susceptible plant saved water and thus had high WUE <Available water

  6. Carbon isotope discrimination (delta) - A biochemical marker for plant WUE Farquhar G.M. Masle J. Hubrick M. von Caemmere S. Terashima I. Current Topics in Plant Biochem.& Physiol. 6:147-155, 1987. This marker enabled to performe least 150 studies on WUE in relations crop breeding, by 2016. One typical example is below:) The effect of selection for WUE (delta) and on productivity and water-use of crested wheatgrass under drought stress Read et al., Crop Sci.32:168, 1992

  7. Carbon isotope discrimination (CID) and wheat canopy temperature as a marker for drought resistance Low WUE Wheat High WUE Susceptible Resistant From Rebetzke et al. (CSIRO Presentation)

  8. Droughtresistantgenotypeshavelow WUE

  9. Genetic Improvement of Water-use and not WUE drove biomass and yield improvement in wheat. (Mean values for wheat grown in NW Mexico, 2010 and 2011) Pask, AJD and MP Reynolds. 2013. Breeding for yield potential has increased deep water extraction capacity in irrigated wheat. Crop Sci. 53:2090–2104 (2013)

  10. Most genetic variations in WUE are driven by variations in WU and not by variations in productivity • Selection for high WUE is a proxy for low WU and it generally resulted in early flowering plants of reduced growth, smaller plant size and lower yield potential. • Under conditions of limited stored soil moisture conditions selection for high WUE (lower water-use at midseason) may result in better yield because this might avoid a terminal desiccation at grain filling. • Under well watered conditions selection for high WUE can result in higher potential yield • Drought resistant varieties developed under classical selection programs tend to express low WUE.

  11. “… genotypes able to sustain a higher water use and stomatal conductance were the most productive and best adapted “ (Abstract)

  12. To download the pdf look for this title at Plantstress/Breeding/drought

  13. “What is the difference between WUE and Water Productivity?” Answer: WUE is a mathematically defined ratio whereas Water Use (or transpiration) and Productivity (or assimilation) are both quantifiable. Water productivity is a vague, undefined and an unquantified term which is used loosely in discussions about water and dryland farming .

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