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Registration of Durum Wheat Germplasm Lines with Combined Mutations in SBEIIa and SBEIIb Genes Conferring Increased Amylose and Resistant Starch.
Journal of Plant Registrations ( IF 0.8 ) Pub Date : 2014-08-01 , DOI: 10.3198/jpr2014.02.0007crg
Brittany Hazard 1 , Xiaoqin Zhang 1 , Mahmoudreza Naemeh 1 , Jorge Dubcovsky 1
Affiliation  

Durum wheat [Triticum turgidum L. subsp. durum (Desf.) Husn.], used in pasta, couscous, and flatbread production, is an important source of starch food products worldwide. The amylose portion of the starch forms resistant starch complexes that resist digestion and contribute to dietary fiber. Increasing the amount of amylose and resistant starch in wheat by mutating the STARCH BRANCHING ENZYME II (SBEII) genes has potential to provide human health benefits. Ethyl methane sulfonate mutations in the linked SBEIIa and SBEIIb paralogs were combined on chromosomes 2A (SBEIIa/b‐A; Reg. No. GP‐968, PI 670159), 2B (SBEIIa/b‐B; Reg. No. GP‐970, PI 670161), and on both chromosomes (SBEIIa/b‐AB; Reg. No. GP‐969, PI 670160) in the tetraploid wheat cultivar Kronos, a semidwarf durum wheat cultivar that has high yield potential and excellent pasta quality. These three double and quadruple SBEII‐mutant lines were compared with a control sib line with no SBEII mutations in two field locations in California. The SBEIIa/b‐AB line with four mutations showed dramatic increases in amylose (average 66%) and resistant starch (average 753%) relative to the control. However, the SBEIIa/b‐AB line also showed an average 7% decrease in total starch and an 8% decrease in kernel weight. The release by the University of California–Davis of the durum wheat germplasm combining four SBEIIa and SBEIIb mutations will accelerate the deployment of these mutations in durum wheat breeding programs and the development of durum wheat varieties with increased resistant starch.

中文翻译:

注册具有 SBEIIa 和 SBEIIb 基因组合突变的硬粒小麦种质系,这些突变赋予增加的直链淀粉和抗性淀粉。

硬粒小麦 [ Triticum turgidum L. subsp. 硬粒小麦(Desf.) Husn.] 用于意大利面、蒸粗麦粉和扁面包的生产,是全球淀粉食品的重要来源。淀粉的直链淀粉部分形成抵抗消化并有助于膳食纤维的抗性淀粉复合物。通过突变淀粉支化酶 II ( SBEII ) 基因来增加小麦中直链淀粉和抗性淀粉的含量,有可能为人类健康带来益处。连接的SBEIIaSBEIIb旁系同源物中的甲磺酸乙酯突变结合在染色体 2A(SBEIIa/b -A;注册号 GP-968,PI 670159)、2B(SBEIIa/b-B; 注册。No. GP-970, PI 670161),以及在四倍体小麦品种 Kronos 的两条染色体上( SBEIIa/b -AB;登记号 GP-969, PI 670160),Kronos 是一种具有高产潜力的半矮硬粒小麦品种优秀的意大利面质量。将这三个双重和四重SBEII突变品系与加利福尼亚州两个田间地点没有SBEII突变的对照同胞品系进行了比较。与对照相比,具有四个突变的 SBEIIa/b-AB 品系显示直链淀粉(平均 66%)和抗性淀粉(平均 753%)显着增加然而,SBEIIa/b‐AB 系还显示总淀粉平均减少 7%,仁重平均减少 8%。加州大学戴维斯分校发布的硬粒小麦种质结合了四种SBEIIaSBEIIb突变,将加速这些突变在硬粒小麦育种计划中的部署以及抗性淀粉含量增加的硬粒小麦品种的开发。
更新日期:2014-08-01
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