title: Differences of starch granule distribution in grains from different spikelet positions in winter wheat.
abstract: Wheat starch development is a complex process and is markedly difference by changes in spikelet spatial position. The present study deals with endosperm starch granule distribution and spatial position during filling development. The study was conducted with pure starch isolated from wheat (Triticum aestivum L.), Jimai20 and Shannong1391, at 7-35 days after anthesis (DAA). The results showed that grain number, spikelet weight and grain weight per spikelet in different spatial position showed parabolic changes. Upper spikelets had highest starch and amylose content followed by basal spikelets, then middle spikelets. The paper also suggested the volume percents of B-type and A-type granule in grain of middle spikelets were remarkably higher and lower than those of basal and upper spikelets, respectively. However, no significant difference occurred in the number percents of the two type granule. The ratio of amylase to amylopectin was positively correlated with the volume proportion of 22.8-42.8 µm, but was negatively related to the volume proportion of <9.9 µm. The results indicated that the formation and distribution of starch granules were affected significantly by spikelet position, and grains at upper and basal spikelet had the potential of increasing grain weight through increasing the volume of B-type granules.
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China; Agricultural Products Quality Inspection Center of Jining, Jining, Shandong, P. R. China.
authors.forename: Anling
authors.initials: A
authors.lastname: Yu
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Agricultural Bureau of Rencheng District, Jining City of Shandong Province, Jining, Shandong, P. R. China.
authors.forename: Yingli
authors.initials: Y
authors.lastname: Ni
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Weibing
authors.initials: W
authors.lastname: Yang
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Dongqing
authors.initials: D
authors.lastname: Yang
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Zhengyong
authors.initials: Z
authors.lastname: Cui
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Zhenlin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: National Key Laboratory of Crop Biology, Ministry of Science and Technology, Agronomy College of Shandong Agricultural University, Tai'an, Shandong, P. R. China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Yin
mesh_terms: D000681:Amylases / Q000032:analysis; D000687:Amylopectin / Q000032:analysis; D000688:Amylose / Q000032:analysis; D010316:Particle Size; D012639:Seeds / Q000737:chemistry*; D062206:Spatial Analysis; D013213:Starch / Q000032:analysis*; D013472:Sunlight; D013696:Temperature; D014908:Triticum / Q000737:chemistry*
chemical_list: D013213:Starch; D000688:Amylose; D000687:Amylopectin; D000681:Amylases