中国农业科学2011，Vol.44Issue(21)：4537-4543,7.
不同类型甘薯品种块根淀粉粒粒度的分布特征
Starch Granule Size Distribution in Storage Roots of Different Types of Sweetpotato Cultivars
摘要
Abstract
[Objective] An experiment was conducted to clarify the starch granule size distribution and the relationship between starch granule size and starch quality properties in storage roots of different types of sweetpotato cultivars. [ Method ] Six starchy sweetpotato cultivars, five edible sweetpotato cultivars, and one dual-purpose sweetpotato cultivar were planted at Taian experimental site in Shandong Province, with randomized block design in 2009-2010 growing season. The volume distribution and number distribution of starch granule, and their relationship to the content of total starch and its components in storage root were determined. [Result] The starch granule in storage root was 0.39-55.14 μm in diameter, containing smaller type (diameter<3.36 μm), mid-type (diameter 3.36-19.76 μm) and larger type (diameter> 19.76 μm) granules. The distribution frequency showed typical two-peak curve in starch granule volume and number, and the grain diameters were all equal to 3.36 μm. The volume of smaller type granule accounted for 9.8%-18.5% of the total starch granule, and the number of smaller type granule accounted for 97.7%-99.1% of the total starch granule. The volume percentage of <3.36 μm starch granule and the number percentage of < l.00μm starch granule were higher in edible sweetpotato than in starchy sweetpotato. The contents of total starch , amylose and amylopectin were negatively correlated with the volume percentage of smaller type (r=-0.772**, -0.730**, -0.774** ) and middling type (r=-0.723**,-0.715**, -0.712**) starch granules, respectively, but positively correlated to larger type (r=0.746**, 0.729**, 0.738**) starch granule. The ratio of amylopectin to amylose was positively correlated with the volume percentage of smaller type (r=0.716**) and middling type (r=0.740**) starch granules, respectively, but negatively correlated to larger type (r=-0.745**) starch granule. [Conclusion] The rates of small starch grains in storage root of edible sweetpotato were higher, but the rates of big starch grains in storage root of starchy sweetpotato were higher.关键词
甘薯/块根/淀粉/粒度分布/品质Key words
sweetpotato/ storage root/ starch/ particle distribution/ quality引用本文复制引用
史春余,姚海兰,张立明,柳洪鹃,张超,刘桂玲..不同类型甘薯品种块根淀粉粒粒度的分布特征[J].中国农业科学,2011,44(21):4537-4543,7.基金项目
国家自然科学基金(31000689)、国家甘薯产业技术体系 （31000689）
