International Journal of
Plant Physiology and Biochemistry

  • Abbreviation: Int. J. Plant Physiol. Biochem.
  • Language: English
  • ISSN: 2141-2162
  • DOI: 10.5897/IJPPB
  • Start Year: 2009
  • Published Articles: 100

Full Length Research Paper

Effect of cassava brown streak disease (CBSD) on cassava (Manihot esculenta Crantz) root storage components, starch quantities and starch quality properties

Nuwamanya Ephraim
  • Nuwamanya Ephraim
  • National Crops Resources Research Institute (NaCRRI), Root crops program, Biosciences Section, Kampala-Uganda.
  • Google Scholar
Baguma Yona
  • Baguma Yona
  • National Crops Resources Research Institute (NaCRRI), Root crops program, Biosciences Section, Kampala-Uganda.
  • Google Scholar
Atwijukire Evans
  • Atwijukire Evans
  • National Crops Resources Research Institute (NaCRRI), Root crops program, Biosciences Section, Kampala-Uganda.
  • Google Scholar
Acheng Sharon
  • Acheng Sharon
  • National Crops Resources Research Institute (NaCRRI), Root crops program, Biosciences Section, Kampala-Uganda.
  • Google Scholar
Alicai Titus
  • Alicai Titus
  • National Crops Resources Research Institute (NaCRRI), Root crops program, Biosciences Section, Kampala-Uganda.
  • Google Scholar


  •  Received: 13 February 2015
  •  Accepted: 19 March 2015
  •  Published: 29 April 2015

Abstract

Effect of cassava brown streak disease on cassava root storage components were studied on four Ugandan varieties with varying levels of tolerance. Significant differences (P<0.05) were observed with reductions of 30% in amylose content and 50% in amylopectin content of diseased compared to healthy plots. Average dry matter content of diseased plots was 25% higher as much as starch yield and starch content reduced by 40 and 15% respectively in diseased plots compared to healthy plots. Susceptible varieties had lower protein and higher cyanide contents in diseased state compared to tolerant varieties. On pasting, mixed reactions were observed but importantly there were significant differences (P<0.05) in the starch pasting properties of starch from diseased compared to healthy plots. Plants with similar reactions to viral attack at the phenotypic level had different reactions when the levels of particular metabolite components (especially cyanide and starch constituents) were quantified.  The results point to hijacking of plant carbohydrate and nitrogen metabolic processes for viral metabolic gains. In turn, this affects the use of cassava for food and other applications but also points to possible use of metabolite based selections for tolerant varieties rather than mere root and stem phenotypic observations. 
 
Key words: Brown streak disease, Cassava, metabolism, starch, plant virus.