title: Determination of amylopectin structure and physicochemical properties in rice endosperm starch of mutant lines derived from Malaysian rice cultivar MR219.
abstract: BACKGROUND
  Characterization of starch properties and functionality can apply breeding program selection for desirable traits such as eating, cooking and processing qualities to meet consumer preference. Low amylose content is generally preferred in Malaysia because of cohesive, tender and glossy cooked rice. Rice high in short-chain amylopectin has a lower transition temperature of starch gelatinization. In the continuing search for improved starch quality in rice cultivars a study was carried out with new mutant lines MR219-4 and MR219-9, derived from MR219.
  
  
  RESULTS
  MR219 and its mutant lines contain L-type amylopectin, being high in amylopectin of intermediate chain length with degree of polymerization 12-21. The apparent amylose content (AAC) in MR219-4 had lower AAC value (19.2%) compared to other lines. A strongly negative correlation was found between chain-length fraction of amylopectin and transition temperatures-onset temperature peak temperature, and conclusion temperature (0.992, 0.958, 0.950; P < 0.01)-with fraction b1 (fb1), respectively.
  
  
  CONCLUSIONS
  The Malaysian lines studied contain L-type amylopectin and offer a better understanding of grain quality improvement in terms of starch properties and functionality. This information will be directly applicable to select for desirable traits in future breeding programs.
authors: Institute of Bioscience, Universiti Putra Malaysia, Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia.
authors: Nyo Nyo
authors: NN
authors: Mar
authors: Takayuki
authors: T
authors: Umemoto
authors: Maznah
authors: M
authors: Ismail
authors: Siti Nor Akma
authors: SN
authors: Abdullah
authors: Mahmood
authors: M
authors: Maziah
mesh_terms: D000687:Amylopectin / Q000737:chemistry / Q000235:genetics*; D000688:Amylose / Q000235:genetics / Q000378:metabolism; D056625:Endosperm / Q000378:metabolism*; D063427:Food Quality; D006801:Humans; D008296:Malaysia; D009154:Mutation; D012275:Oryza / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D013213:Starch / Q000737:chemistry / Q000235:genetics*; D013696:Temperature
chemical_list: D013213:Starch; D000688:Amylose; D000687:Amylopectin