Empowering the thirsty plants ways for drought tolerance
- Slides: 15
Empowering the “thirsty” plants - ways for drought tolerance In|es Modesto “Plants for Life” International Ph. D Program – 2016 (course “Plant Biotechnology for Sustainability and Global Economy”)
World Population Growth Increasing food demand Increasing water demand
World Population Growth => Water demand Less water available for agriculture
Groundwater – a vital source 30% of all liquid freshwater is groundwater (below the soil surface) Groundwater is the main source of water in low income countries This groundwater is highly exploited for agriculture, mainly in Asia (e. g. India, China) In India, a new tube well is sunk every 6 seconds!
Groundwater at risk Water used for other purposes Overexloitation Water depletion High population density Water contamination Less water available for agriculture
In large areas of the globe, agriculture is rainfed 75% in Near East and North Africa 95% in Sub. Saharan Africa 90% in Latin America 65% in East Asia 60% in South Asia
Rainfed agriculture Very uncertain Severely affected by climate change
Challenges in agriculture “More Crop per Drop” Plants that use water more efficiently Plants that can endure periods wihout water
Most drought-tolerant plants are not crops Agave “resurrection plant” Torrey yucca Desert marigolds Cactus
Diversity of mechanisms to avoid water shortage Strategy Benefits Drought avoidance Extensive root system Increases water uptake Early reproduction Avoids late season water deficit Drought tolerance Cellular protectants Avoid cell death under severe drought
Biotechnology tools => searching for solutions - (1) Rice Molecular Markers for tolerance (QTLs) x Drought-tolerant rice Select plants Elite quality rice similarity Drought tolerance QTLs Steele et al. 2006, Theor. Appl. Genet. 112, 208 -221 Elite quality rice … Drought-tolerant elite rice x
Biotechnology tools => searching for solutions - (2) Maize Trehalose Engineering trehalose biosynthesis Protects from desiccation Bacteria where the resistance genes were found “resurrection plant”, in drought (above) or watered + 31 -123 % yield Susceptible maize Nuccio et al. 2015, Nat. Biotechnol. , 33: 8, 862 -869 Drought-tolerant maize
Take-home messages Drought and water scarcity are serious threats for food security We need drought-tolerant crops for rainfed regions Plant biotechnology provides more tools for crop improvement
Recommended References Ø http: //www. iwmi. cgiar. org/ Ø Sasson, Albert (2009) The Global Food Crisis: Causes, Prospects, Solutions. Agri-Bys Ø A Fita, A Rodrigues-Burruezo, M Boscaiu, J Prohens and O Vicente (2015) Breeding and Domesticating Crops Adapted to Drougth and Salinity: A New Paradigm for Increasing Food Production. Frontiers in Plant Science, 6: 978 Ø RR Mir, M Zaman-Allah, N Sreenivasulu, R Trethowan and RK Varshney (2012) Integrated genomics, physiology and breeding approaches for improving drought tolerancein crops. Theoretical and Applied Genetics, 125: 625 -645 Ø M Ashraf (2010) Inducing drought tolerance in plants: Recent advances. Biotechnology Advances, 28: 169 -183
TH NK YOU!
- Unilateral tolerance and bilateral tolerance
- Cellular and molecular immunology
- Romans 3:10
- Aleph toolbox
- Vermont drought monitor
- Drought in a sentence
- Drought present tense
- Jordan drought
- Drought presentation
- Utah drought map
- Types of drought
- Drought and desertification
- Anasazi drought
- Drought stopper system
- Concept of sustainable development
- What are solutions of drought