冬小麦突变新品系‘白鹿181’的遗传构成、品质分析及栽培技术

Genetic composition, quality analysis, and cultivation techniques of a new winter wheat line ‘Bailu 181’

  • 摘要: 为了选育高产优质小麦新品种, 服务国家粮食安全, 本研究以‘小偃22’为试验材料, 采用CO2激光致死剂量辐射小麦品种‘小偃22’的种子, 筛选突变株, 检验其稳定性, 分析其产量和品质, 并探讨突变株‘白鹿181’新品系的栽培技术。结果表明: 1)通过小麦660K芯片对‘小偃22’的突变株‘白鹿181’新品系进行遗传构成鉴定, 共检测出630 517个单核苷酸多态性(SNPs)位点, 其中有1个不确定SNP位点, 无差异SNPs位点442 859个(占70.24%), 差异SNPs位点187 657个(占29.76%)。以‘小偃22’为模板, 发现缺失和变异主要集中在AA、AC、AG、AT、CC、CG、GG、TC、TG和TT单核苷酸多态性(SNPs)上, 其中AA、CC、GG和TT分别占19.23%、23.50%、23.40%和19.46%。2)与‘小偃22’相比, 激光诱变产生的突变株‘白鹿181’的千粒重和产量3年平均增幅分别为9.31%和5.10%。3) ‘白鹿181’的17种氨基酸含量均高于‘小偃22’, 籽粒容重增加7.3%, 湿面筋指数增加15.4%, 稳定时间延长11.0%, 最大拉伸阻力增加34.8%。4)不同施肥量和播种量对‘白鹿181’产量和千粒重均有不同程度的影响。从产量和千粒重综合考虑, 在施750 kg∙hm−2氮肥条件下, 每公顷播种180 kg种子的效益可实现最大化。研究结果表明, ‘白鹿181’较适宜于关中平原等黄河中游地区种植, ‘白鹿181’新品系的培育, 为丰富我国小麦种质资源以及选育优质高产新品种提供了新材料。

     

    Abstract: The frequency of extreme weather events, such as low and high temperatures, flood and droughts, has increased in recent years, negatively impacting the production, yield, and quality of wheat worldwide. With the rapid socioeconomic development and population growth in China, the demand for wheat is constantly increasing. Therefore, cultivating wheat varieties with a high yield, good quality, and strong resistance is crucial for ensuring national food security. In an attempt to cultivate new varieties of wheat showing adaptability and resistance to adverse weather conditions, the wheat variety ‘Xiaoyan 22’ was radiated with a lethal dose of CO2 laser to create mutant lines. The resulting mutant lines were screened for their stability, yield, and quality, and assessed against a range of cultivation techniques. ‘Bailu 181’ was selected as the new line most suitable for field environment. The test results showed that: 1) The genetic composition of the mutant strain ‘Bailu181’ from ‘Xiaoyan 22’ was analyzed using the Wheat 660K microarray, identifying 630 517 single nucleotide polymorphisms (SNPs), including 1 indeterminate SNP, 442 859 non-differential SNPs (70.24%), and 187 657 differential SNPs (29.76%). Compared with ‘Xiaoyan 22’, the genetic mutations of ‘Bailu 181’ mainly occurred in the SNPs of AA, CC, GG, and TT (19.23%, 23.50%, 23.40%, and 19.46%, respectively). 2) The 1000-grain weight and yield of ‘Bailu 181’ were significantly greater than those of ‘Xiaoyan 22’, with a mean increase of 9.31% and 5.10%. 3) The contents of 17 amino acids were higher in the seeds of ‘Bailu 181’ than in those of ‘Xiaoyan 22’. Compared with ‘Xiaoyan 22’, the grain bulk density and wet gluten index of ‘Bailu 181’ increased by 7.3% and 15.4%, respectively, while the stability time and maximum tensile resistance increased by 11.0% and 34.8%, respectively. 4) Different fertilization and sowing amounts had varying degrees of impact on the number of grain number per spike, 1000-grain weight, spike number and yield of ‘Bailu 181’. Taking into account both the yield and 1000-grain weight, the economic benefits were maximized under sowing 180 kg of seeds per hectare and applying 750 kg of nitrogen fertilizer per hectare. The results showed that ‘Bailu 181’ was more suitable for planting in the Guanzhong Plain and the Middle Reaches of the Yellow River Region. Approximately 30% of the genes in ‘Bailu 181’ were found to change after irradiation, providing breeding materials for enriching China’s wheat germplasm resources and breeding new varieties of wheat with high yield.

     

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