耐迟播弱筋小麦主要品质评价指标与优异种质筛选OA

In order to screen the quality evaluation indexes of late-sowing tolerance and excellent weak gluten wheat germplasms,and to guide the breeding and production of weak gluten wheat in the middle and lower reaches of the Yangtze River,eighteen weak gluten varieties(lines)were used as materials in this experiments,and three sowing dates were set for two years.12 quality indexes such as grain hardness,sodium dodecyl sulfate(SDS)sedimentation value,solvent retention capacity(SRC)and biscuit quality of each line were determined.The results showed that water SRC,sodium carbonate SRC,biscuit diameter and biscuit thickness were relatively stable among yearsand between sowing dates.SDS sedimentation values were stable among years.Grain hardness was unstable among years and between sowing dates,while sucrose SRC varied greatly among years.The grain protein content was less affected by sowing dates,while biscuit diameter thickness ratio was greatly affected by sowing dates.Grain hardness,flour protein content,and SDS sedimentation value increased significantly with the delay of sowing date,but the grain hardness index was within the range of AACC55-31 soft wheat index.The sowing date significantly affected four SRCs.Compared with normal sowing date,delayed sowing for 14 days could significantly reduce the sodium carbonate SRC and lactate SRC,and increased the biscuit diameter and diameter thickness ratio.And low grain hardness index,protein content,SDS sedimentation value and water SRC were significantly correlate with high-quality biscuit indicators.Therefore,grain hardness,SDS sedimentation value,water SRC,lactate SRC,and sodium carbonate SRC were suitable as evaluation indexes for the quality of late-sowing weak gluten wheat.Through principal component and cluster analysis,it was found that the three sowing dates of eight varieties(lines)such as Ning 17157(L11),Ning 17158(L12),Ning 17160(L14)and Ning 17164(L20)were clustered into one group,which belonged to the excellent germplasm of late sowing tolerance.The germplasm and evaluation indexes of late-sowing weak gluten wheat screened in this study provide theoretical basis and resource support for the cultivation and improvement of late-sowing weak gluten wheat varieties.