Agricultural Outlook Forum Presented: February 17, 2006 STRATEGIES IN THE APPLICATION OF BIOTECH TO DROUGHT TOLERANCE
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1 Agricultural Outlook Forum Presented: February 17, 2006 STRATEGIES IN THE APPLICATION OF BIOTECH TO DROUGHT TOLERANCE Marc Albertsen Research Director Pioneer Hi-Bred International Incorporated
2 Strategies in the Application of Biotech to Drought Tolerance Marc C. Albertsen Director, Agronomic Traits Pioneer Hi-Bred Intl., Inc. 17 February 2006 USDA Agricultural Outlook Forum 2006
3 2 Drought Tolerance: Many Definitions Broad A recovery of yield normally lost under all levels of stress Moderate A recovery of yield normally lost under a limited range of drought stress Stage-Specific Greater tolerance for drought stress during specific development stages During pollination (Flowering Stress) During grain fill (Grain Fill Stress) At emergence and during early season growth
4 3 Flowering Stress Dryland *M* and *H* Source: Pioneer Hi-Bred International Inc.
5 4 Grain Filling Stress Dryland **M and **H Source: Pioneer Hi-Bred International Inc.
6 5 Drought Tolerance Why Be Concerned? Drought is a primary limiting factor in U.S. soils (Boyer, Science, 1982) and is a key limitation for 50% of the global corn market. Transient water deficits are common in the Corn Belt around pollination and during grain-fill. One year in five water acts as a significant limitation to yield. In the 90 s, FEMA estimated US drought losses at $6-8 billion/yr. Source: Pioneer Hi-Bred International Inc.
7 6 Estimated Yield Losses Est. average annual loss from FT stress = 41 bu/a (21%) on 11.8 million affected acres (16% of the acres). Est. average annual loss from GF stress = 29 bu/a (15%) on 25.2 million acres (34% of the acres). Est. average annual yield loss from drought stresses for all corn acres is 25 bu/a (13%).
8 7 Corn Yield Winners 2005 Corn Yield Winners 2004 Corn Yield Winners Non-Irrigated Class A Name State Yield Bu/A Name State Yield Bu/A B. Woodall TN 280 S. Santini, Jr. NJ 272 H.G. Everman NY 268 T.L. Snodgrass NE 272 M.A. Kennedy Farms NY 266 Seven Springs Farms KY 270 Non-Irrigated AA Name State Yield Bu/A Name State Yield Bu/A Mezera Farms WI 323 F.R. Childs IA 331 F.R. Childs IA 320 M. Dempsey IL 320 Mez-Farm WI 306 Mezera Farms WI 296 No Till/Strip Till Non-Irrigated A Name State Yield Bu/A Name State Yield Bu/A D.K. Hula VA 334 D.K. Hula VA 339 G. Swede Farms NY 265 Schwenke Bros. KY 291 H.D. Everman NY 264 T. Bishop MD 286 Source: National Corn Growers Association, The World of Corn 2005/2004.
9 8 Corn Yield Winners 2005 Corn Yield Winners 2004 Corn Yield Winners No Till/Strip Till Non-Irrigated AA Name State Yield Bu/A Name State Yield Bu/A J. Mezera WI 302 D. Hadden IL 280 J. Mezera WI 292 S. Williams IN 273 K. Klahn WI 280 R. Little IN 270 Ridge Till Non-Irrigated A Name State Yield Bu/A Name State Yield Bu/A M. Gorder ND 237 B. Anthony. NE 287 M. Moody NE 235 C. Santini NJ 258 B. Tanner TN 232 S. Santini NJ 248 Ridge Till Non-Irrigated AA Name State Yield Bu/A Name State Yield Bu/A G.N. Porter IA 276 G.N. Porter IA 279 Cox Farms MO 267 W. Tomhave IL 263 L. Porter MO 259 J. Cox MO 261 Source: National Corn Growers Association, The World of Corn 2005/2004.
10 9 Drought Tolerance is a Shifting Target Corn hybrids today are substantially more drought tolerant than those of the past Pollination during drought stress has been greatly improved Improved synchronization of pollen shed and silk exertion Improved duration of pollen shed Improved pollen heat tolerance Incremental improvement in drought tolerance has been an important part of increasing genetic yield gain But, there is still room for risk reduction Can we achieve step-changes in the future?
11 10 Drought Complexity: Mechanistic factors Precipitation Temperature Other Climate Factors YIELD Physiological Factors Soil Factors Agronomic Factors
12 11 Drought Well Watered Photosynthesis CHO Flux Severe Stress Decreased Yield
13 12 Drought Tolerance: How to approach? Yield and productivity remain the keys to successful drought tolerance Cactus-corn might be an interesting novelty but unlikely to generate much farmer interest!
14 13 Additional Strategies for Drought Tolerance Research: Association Mapping Molecular Breeding Map-Based Cloning Transgenics
15 BUT, without a repeatable, reliable testing regime in the specific crop of interest, success will be a random event 14
16 Managed Environment Research Site 15
17 Managed Environment Enables precise manipulation of flowering stress and/or grain-filling stress 16 Well-Watered 400 GDU Pre- Flowering Stress 700 GDU Pre- Flowering Stress
18 17 Managed Environment Techniques Plant Height Ear Size at 10 DAS Kernel no. at 35 DAS
19 18 Managed Environment Techniques Reproducible evaluation of performance under stress, using precision drip tape irrigation, carries through to harvest
20 19 Managed Environment Results 200 Yield Loss due to Drought Stress at Flowering Hybrid A vs. Hybrid B 180 Hy A 160 Hy B Yield (Bu/acre at 15% Mois) % Loss 62% Loss 20 0 Irrigated Drought Stress
21 Lessons Learned from Field-based Discovery Efforts 20 Used a stress-induced color-producing construct to visually monitor response to drought stress. Fully Irrigated Mild Water Stress Severe Water Stress Fully Irrigated Severe Water Stress 10 μm
22 A repeatable, controllable testing regime enables both conventional and molecularbased approaches to drought tolerance
23 22 Genetic Diversity Genetic mapping Map-based cloning A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D T G A T A C A A I/D T
24 23 Association Mapping Whole genome scan Scan haplotype diversity at frequent intervals across the whole genome Individual 1 Individual 2 Individual 3 Individual 4 Individual 5 Individual 6 Individual 7 Individual 8 Individual n SNPs /haplotypes A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T A A T A C G A T G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C G A T A C A A I/D C Δ Genome segments Haplotypes Phenotypes
25 24 With This Information We Have Two Choices Molecular breeding to move the identified chromosome segment into elite breeding lines OR Clone the gene in the segment that is actually responsible for the desired phenotype and manipulate through genetic engineering
26 25 Map-Based Cloning Phenotype Genetic Map Physical Map Genetic mapping defines and delimits the trait locus to a small interval Physical mapping provides genomic clones spanning the trait locus so that all the genes in that segment can be separated
27 26 Map-Based Cloning Genetic Map (SSRs, AFLPs, EST-SNPs) Fine Mapping Physical Map (Contig of BACs with mapped markers) Verification (Sequence diversity cosegregating with phenotype) Gene X M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 Gene X M5 M1a M2a M3a M4a M5a M6 M1a M2a DNA sequence candidate genes 5 A G AGGAG C T C T T C T A G AGG AG 3 - parent + parent Progeny SNP SNP SNP
28 Drought Tolerance Improvement Genes and Pathways Comparative Mapping Physiological Studies Gene Expression Profiling 27 Forward Genetics Drought Tolerance Reverse Genetics Map-based cloning Literature Natural Variation
29 Initial Evidence for Protection From Drought Stress in T0 s 28 Notice the lack of ear development on the plants on the right
30 29 Yield Stability of a Transgenic 250 Based on YS Regression Equations, Managed Stress Locs Sus Hybrid Transgenic TG Target Yield (bu/a) Bu 26 Bu 50 0 Irrigated Drought
31 Summary: Drought Tolerance Where Are We Today? Hybrid responses to drought can vary significantly depending upon the timing of the stress and the developmental stage. Experimental efforts have been aimed at understanding maize yielding ability under drought stress Starting to gain rudimentary understanding of crop productivity at the whole plant and molecular level Experiments to validate/refute hypotheses generated from a pathway perspective by testing in a managed environment are underway Single gene changes to a complex trait such as drought tolerance may result in genotype or environment specificity that can lack adequate robustness as a product Drought tolerance QTL s can be identified, and individual responsible genes can be cloned Whether manipulating genes in blocks or one at a time, effective plant breeding will be the key to success 30
32 Summary: Drought Tolerance Strategies for Success Early assessment of the traits associated with drought tolerance need to choose the relevant response e.g. the drought survival response likely not too relevant for practical application Effective phenotyping of the genetic modifications Experiment protocol and testing is critical Multi-disciplinary effort likely required Combination of conventional breeding, molecular breeding, genetic engineering Long-term research and development commitment Biotechnology and its technology may shorten the total time, but likely still ~10 years (paraphrased from Sinclair, et al., TIPS 9: ) 31
33 32 Acknowledgements Members of the Drought Team Antoni Rafalski Bailin Li Petra Wolters Carlos Leffler Carlos Messina Chris Zinselmeier Mike DeFelice Jeff Habben Jeff Schussler
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