Journal of Environmental Biology

Inter-relationship between growth analysis and carbohydrate contents of sweet sorghum cultivars and lines

 

A.? Almodares*, R. Taheri and S. Adeli

*aalmodares@yahoo.com

Department of Biology, College of Science, University of Isfahan-81846-73441, Isfahan, Iran

(Received: January 06, 2006 ; Revised received: October 18, 2006 ; Accepted: November 11, 2006)

Abstract: The carbohydrate contents of sweet sorghum (Sorghum bicolor L. Moench) is an important industrial factor for crystal sugar or bioethanol production. In this study the relationship between growth analysis and carbohydrate contents were studied to recognize the best growth stages for sweet sorghum harvesting. Five sweet sorghum cultivars and four sweet sorghum lines were evaluated for leaf area index (LAI), net assimilation rate (NAR), relative growth rate (RGR) and stem crop growth rate (CGR) in relation to ?sucrose content, invert sugars and total sugar at booting, soft-dough, hard dough and post grain maturity. Except at post grain maturity stage, the correlations among LAI, NAR and RGR for sucrose content and total sugar were positive and for invert sugars were negative. The relationship between invert sugars including glucose, fructose, maltose and xylose at hard dough stage regarding LAI, NAR and GRG were negative. As plant grows LAI, NAR and RGR increases which consequently increases sucroses content and decrease invert sugar.

Key words:?? Sweet sorghum, LAI, NAR, RGR, CGR, Sucrose, Invert sugar

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