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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 33B Kim et al., 2012 USDA, Wye, MD Pioneer 34M91 and Pioneer 37Y Kim et al., 2012 Grignon, FranceDEA (Pioneer hybrid) Lizaso et al., 2011 East Lansing, MIGL Lizaso and Ritchie, 1997 Manchester, IAPioneer 33P672002Yang et al., 2004 Lincoln, NE Pioneer 33A14 and Pioneer 33P Yang et al., 2004 Urbana-Champaign, ILPioneer and Dekalb Dohleman and Long, 2009 Gainesville, FLMcCurdy1982Bennett et al., 1986 Guelph, Ontario, Canada Pioneer 3902, Pioneer 3851, and Pride Valentinuz 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 Andrade et al. (many) Paysandu, Uruguay 2 hybrids 3 planting dates ( Nov. to Jan) Kemanian and Mazilli Indiana and Ohio 3 Pioneer hybrids 3 planting dates (April to June) 4 locations Nielsen et al., 2002 IA 2 hybrids Hatfield Missouri 3 hybrids 2 planting dates 2 locations Kiniry and Keener, 1982 NE and IA 2 hybrids 3 plant densities 2 locations Yang et al., 2004 Monsanto >3,000 hybrids (RM75 – RM120) 1 location Monsanto various hybrids (RM75 – RM120) 45 locations 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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