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Objectives The objectives of the meeting are to: (i)examine the current physiological understanding of the mechanisms underlying leaf-area expansion and.

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Presentation on theme: "Objectives The objectives of the meeting are to: (i)examine the current physiological understanding of the mechanisms underlying leaf-area expansion and."— Presentation transcript:

1 Objectives The objectives of the meeting are to: (i)examine the current physiological understanding of the mechanisms underlying leaf-area expansion and its response to abiotic factors (ii)compare methodologies used in current maize models to model leaf-area expansion and senescence. Abiotic factors that require special attention in modeling leaf-area expansion and senescence are: – Water stress – N stress – Temperature – Plant density – Soil compaction

2 Agenda TimeDescription 00:00 – 00:10Introduction 00:10 – 00:40Physiology of leaf-area expansion – François Tardieu 00:40 – 00:50Questions and discussion 00:50 – 01:05Modeling leaf-area expansion and senescence at the canopy level – Armen Kemanian & Claudio Stöckle 01:05 – 01:10Questions and discussion on how other canopy-level models differ 01:10 – 01:25Modeling leaf-area expansion and senescence at the leaf level – Jon Lizaso 01:25 – 01:30Questions and discussion on how other leaf-level models differ 01:30 – 01:50Available data sets to evaluate leaf-area expansion and senescence routines and evaluation methodologies. 01:50 – 02:00Next steps…

3 Participation Last Name First Name Institute/company Andrade Fernando INTA, Balcarce, Argentina x Boote Ken Univ. of Florida, Gainesville, FL Cairns Jill CIMMYT, Harare, Zimbabwe x Castiglioni Paolo Dow AgroSciences, Davis, CA Edmeades Greg New Zealand x Hammer Graeme Univ. of Queensland, Brisbane, Australia x Hatfield Jerry USDA-ARS, Ames, IA x Holland Jim USDA-ARS, NC State Univ., Raleigh, NC Hoogenboom Gerrit Washington State Univ., Prosser, WA x Jones Jim Univ. of Florida, Gainesville, FL x Kemanian Armen PennState, University Park, PA x Kim Soo Univ. of Washington, Seattle, WA Kiniry Jim USDA-ARS, Temple, TX x Kumudini Saratha Monsanto Co., RTP, NC x Lizaso Jon Univ. of Madrid, Madrid, Spain Nendel Claas Leibniz, Germany Otegui Maria Univ. of Buenos Aires, Buenos Aires, Argentina. x Sala Rodrigo Monsanto, Jerseyville, IL Singh Upendra IFDC, Muscle Shoals, AL x Stöckle Claudio Washington State Univ., Pullman, WA x Tardieu François INRA, Toulouse, France x Timlin Dennis USDA-ARS, Beltsville, MD x Tollenaar Thijs Monsanto Co., RTP, NC x Vyn Tony Purdue Univ., West Lafayette, IN Wallach Daniel INRA, Toulouse, France Westgate Mark Iowa State Univ., Ames, IA x Yang Haishun Univ. of Nebraska, Lincoln, NE

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5 Next Steps 1.Evaluation of leaf area routines (how?)

6 Data SourceGenetic materialYear(s)Publication USDA, Collins, DEPioneer 33B532006-2007Kim et al., 2012 USDA, Wye, MD Pioneer 34M91 and Pioneer 37Y14 2006-2008Kim et al., 2012 Grignon, FranceDEA (Pioneer hybrid)1994-1995Lizaso et al., 2011 East Lansing, MIGL 4201991Lizaso and Ritchie, 1997 Manchester, IAPioneer 33P672002Yang et al., 2004 Lincoln, NE Pioneer 33A14 and Pioneer 33P67 1999-2001Yang et al., 2004 Urbana-Champaign, ILPioneer and Dekalb2007-2008Dohleman and Long, 2009 Gainesville, FLMcCurdy1982Bennett et al., 1986 Guelph, Ontario, Canada Pioneer 3902, Pioneer 3851, and Pride 5 1999-2001Valentinuz and Tollenaar, 2004 Leaf Area Evaluation Data sets

7 Leaf Area Expansion and Senescence – Plant Density Effect Data from Yang et al., 2004

8 Next Steps Evaluation of leaf area routines - E valuate leaf area routines in various models similar to AgMIP maize pilot project?

9 Next Steps 1.Evaluation of leaf area routines (how?) 2.Report on analyses of the temperature response for anthesis/silking and GFP 3.Photoperiod response to time to anthesis/silking and duration of the GFP

10 Data SourceDescriptionYearPublication Balcarce, Argentina many hybrids (Monsanto/Pioneer) multiple planting dates (Sept. to Jan.) various plant densities 1989-2012Andrade et al. (many) Paysandu, Uruguay 2 hybrids 3 planting dates ( Nov. to Jan) 2009-2010Kemanian and Mazilli Indiana and Ohio 3 Pioneer hybrids 3 planting dates (April to June) 4 locations 1994-1994Nielsen et al., 2002 IA 2 hybrids2010-2012Hatfield Missouri 3 hybrids 2 planting dates 2 locations 1978-1979Kiniry and Keener, 1982 NE and IA 2 hybrids 3 plant densities 2 locations 1999-2002Yang et al., 2004 Monsanto >3,000 hybrids (RM75 – RM120) 1 location 2007-2012 Monsanto various hybrids (RM75 – RM120) 45 locations 2007-2011 Phenology Data Sets

11 N N N N N N N Association between planting-anthesis interval and photoperiod at four leaf-tip stages in four data sets (N = slope is negative)

12 Association between duration of GFP and photoperiod at four leaf-tip stages in four data sets (N = slope is negative) N N NN N N N

13 Next Steps 1.Evaluation of leaf area routines (how?) 2.Report on analyses of the temperature response for anthesis/silking and GFP 3.Photoperiod response to time to anthesis/silking and duration of the GFP 4.Leaf and canopy photosynthesis routine

14 Model Evaluation with Public Data: Leaf Appearance and Leaf Area Expansion and Senescence


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