AR Rice Performance Trials (ARPT) Color as a Quality Indicator. Functional Property Analyses. Cause of Chalkiness in Rice Kernels

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1 Chlk, Color, n Milling Qulity Trens in AR Rice Performnce Tril Dt Srh Lnning, Rusty Butist, Terry Sieenmorgen, Pul Counce, n Amogh Amrekr 1 Inustry Allince Meeting Center for Excellence in Poultry Science Auitorium University of Arknss My -7, 1 AR Rice Performnce Trils (ARPT) Fiel stuies conucte in,, n 9 Gol of quntifying milling n functionl properties of rice cultivrs Multiple cultivrs/loctions/hrvest moisture contents evlute ech yer Functionl Property Anlyses Color s Qulity Inictor Physicl Iniviul kernel MC Iniviul kernel imensions Chlky kernels Color Totl milling yiel He rice yiel Chemicl Surfce Lipi Content Totl Lipi Content Protein Pste viscosity Amylose Rheology/Texture Cooking Lightness, or whiteness, is use s gring criterion for rice qulity Preferre color is uniform, trnslucent white My e ffecte y genetics, growth conitions, elevte storge temperture/moisture, n DOM Chlkiness s Qulity Defect Opque sections of the kernel (core, ck, elly) Prone to rekge, cusing reuction in HRY Reuces commercil vlue of rice Affects processing functionlity Cuse of Chlkiness in Rice Kernels Depression of cell growth uring reprouctive growth stge Insufficient ccumultion of strch Loose pcking of enosperm, renering n opque ppernce 1

2 Current Stuy Ojectives Evlute milling qulity, color, n chlk trens in ARPT smples Unerstn the effects/interctions of prouction fctors n environmentl conitions Nighttime ir temperture Cultivrs Evlute ( n ) Long grins Cypress LGrue Wells XL3 Meium grins Bengl Jupiter Loctions Evlute Corning Newport Stuttgrt Rohwer Corning Pine Tree Stuttgrt Rohwer Metho of Chlk Anlysis Winseele Imge Anlysis System Brown Rice kernels HMC Rnge: 11.5-% Imge is scnne. Kernel imensions re cpture. Metho of Color Anlysis He Rice Color: Hunter Colorflex Colorimeter L* * * Color Scle L* = Drk to Light (Blck to White) Chlk is quntifie s the proportion of opque to trnslucent re within ech kernel, se on the kernel s imensions n pre-efine color clsses.

3 Yer Effect, Across All Cultivrs n Loctions Generlly, greter vriility in ll ttriutes Oservtions uring thn Pek HRYs were similr in n ; Averge HRY ws lower in Chlk ws more prevlent in L* (whiteness) vlues were greter in Chlkiness y Cultivr Chlk: Trens n Correltions Chlk, % c. Bengl Jupiter Cypress LGrue Wells XL3 Cultivr Chlkiness y Cultivr Chlkiness y Growing Loction Chlk, % % Chlk 8 c.. c c c Bengl Jupiter Cypress LGrue Wells XL3 Cultivr Corning Newport Stuttgrt Rohwer Growing Loction 3

4 Chlkiness y Growing Loction % Chlk Corning Pine Tree Rohwer Stuttgrt Growing Loction Reltionship Between Chlk n Hrvest Moisture Content Chlk, % Hrvest Moisture Content, % He rice yi iel, % Pek He Rice Yiel 8 Pek he rice yiel Hrvest moisture content, % Reltionship Between Chlk n Pek HRY Across ll Cultivrs n Loctions Pek HRY Y, % Averge Chlkiness, % Effect of Nighttime Air Temperture During Kernel-Filling Stge on Chlk ( Dt) Frequency LGrue, Newport, R Chlk =.% LGrue, Rohwer, R Chlk = 7.9% Color: Trens n Correltions Temperture, F

5 Men L* Vlues Among Cultivrs Men L* Vlues Among Cultivrs Bengl Jupiter Cypress LGrue Wells XL3 c e Bengl Jupiter Cypress LGrue Wells XL3 Cultivr Cultivr Effect of Loction on Whiteness Effect of Loction on Whiteness Corning Newport Stuttgrt Rohwer Cultivr Corning Pine Tree Stuttgrt Rohwer Cultivr Reltionship of Color to Chlk Reltionship Between Whiteness Surfce Lipi Content (i.e. DOM) L* 8 78 : R² =. : R² = % Chlk L* R² = Surfce Lipi Content, % L* R²= Surfce Lipi Content, % 5

6 Significnt Finings Cultivrs iffer in chlk susceptiility Growing conitions ffect chlk Chlk increses s HMC ecreses Color is ffecte y yer n cultivr Whiteness increses s DOM increses, to point Some correltion etween whiteness n chlk Chlk my impee color mesurement Work in Progress Anlysis of 9 Hrvest smples Preliminry t suggests moerte chlk levels Evlution of environmentl conitions uring hrvest sesons -9, esp. nighttime ir temperture Impct on physicl n chemicl properties of rice Acknowlegments The uthors re grteful to the Arknss Rice Reserch n Promotion Bor n the University of Arknss Rice Processing Progrm Inustry Allince Group for the finncil support of this project. Thnk you! Thnks to Neli Couch, Re Burgos, n Allen Busik for their ssistnce in processing the smples.