Analysis of starch swelling power in Australian breeding lines of hexaploid wheat (Triticum aestivum L.)

作者：Ansari Omid; Baga Monica; Chibbar Ravindra N^*; Sultana Nilufa; Howes Neil K

来源：Field Crops Research, 2010, 115(2): 171-178.

DOI：10.1016/j.fcr.2009.11.001

• Starch swelling power
• Amylose
• Heritability
• Triticum aestivum L.

Starch is the major component of wheat (Triticum aestivum L.) grain and is composed of two large glucan molecules, amylose and amylopectin. The ratio between the two polymers types influences the water absorbing properties of starch upon heating, and thus affects the end-use of grain and purified starch. In this study, we evaluated the starch swelling power (SSP) values in seven wheat populations developed from crosses involving low-SSP lines. Analysis of starch produced by the F(2) generation plants showed that the largest SSP variation (11.4-16.2) and lowest SSP mean (13.9) was obtained for a population derived from doubled haploid lines SM1028 (SSP = 14.5) and VK306 (SSP = 13.6). The population of 360 lines was advanced by single seed descent to the following generations for further studies. Starch analysis of grain produced by F(4) generation lines in two field locations during 2006 and in a greenhouse environment during 2005 showed that SSP values were relatively stably inherited. The average broad-sense heritability was 73% and significant (P < 0.001) genotype x genotype and genotype x environ-environment interactions were seen. Starches with the highest and lowest SSP values were inversely related to amylose concentration determined by high pressure liquid chromatography (HPLC)-size exclusion chromatography (SEC) of debranched starch. Developed lines with the lowest SSP values surpassed 40% in apparent amylose concentration. The study illustrates that screening for SSP in early generations can be used to develop wheat lines with desired starch swelling characteristics.

• 出版日期2010-1-20