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连续回交在转育两用不育系中的应用 总被引:1,自引:0,他引:1
以安农S-1为不育基因供体,用常规水稻品种为轮回亲本连续回交,在F2中出现有较高频率的育性可转换的核不育株,不同的轮回亲本,F2代不育株对低温的敏感程度不同,转换为可育的时期不同。文章对水稻雄性核不育两用系的选择方法,常规水稻品种在转育两用不育系中的作用,进行了探讨。 相似文献
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以常规小麦为不育基因受体,用重庆温光型两用雄不育系C49-87为轮回亲本回交,通过调查B1F2、B2F2、B3F2的不育株率和回交后代B2F5中株系的育性表现,发现回交两次是转育小麦雄性不衣两用系的有效方法。 相似文献
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高异交率籼型三系不育系M98A的选育与利用 总被引:3,自引:3,他引:3
以保持龙特浦A的综合优良性状,改造其不育性稳定性和稻米品质为定向选育目标,用龙特浦B作母本,Ⅱ-32B作父本杂交,在F4代的优良株系中选株与龙特浦A测交并回交,经多代回交转育,育成高异交率籼型三系不育系M98A.M98A表现不育性稳定,异交结实率高,抗病性好,配合力强,2005年1月通过安徽省农作物品种审定委员会审定.用该不育系配组育成的杂交中籼组合,表现早熟、高产、抗病,其中明优98和农华优808已分别通过国家和安徽省品种审定. 相似文献
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“川苎8号”(原代号D-156)是我所用自育的优良雄不育系C26和恢复系B8配制而成的两系杂交苎麻组合。在1995—1997年四川省苎麻区域试验中平均原麻产量1957.8kg/hm^2,较对照红皮小麻增产41.85%,在组合比较试验中平均原麻产量2546.1kg/hm^2,较对照红皮小麻增产69.04%;两组试验增产均达极显著水平。该组合纤维品质优良,在苎麻区域试验中平均单纤维细度为1913支;在生产示范中,经达州市纤检局检测平均单纤维细度为1978支。该组合采用种子繁殖,后代在品质和经济性状上分离变异极小;植株高大、粗壮、经济性状优良,蔸型、株型理想,抗逆性强,高抗苎麻花叶病,抗旱、抗风力强。 相似文献
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利用石蜡切片显微观察、雄性不育基因遗传分析和缺体定位等方法.对兰州核不育小麦不育基因进行了遗传研究,以明确该不育基因的遗传学特性。显微观察发现,兰州核不育小麦不育系257A的不育花药各壁层组织在不同发育时期没有明显的结构发育异常现象,但不育花药的绒毡层及中层组织有延迟解体的趋势。257A与中国春等小麦品种的杂交F1结实率、F2和F1BC1代育性分离比率调查结果表明,该突变体材料不育性是受一对隐性核基因控制.不育性遗传稳定,不受小麦品种细胞质以及光、温等生态因子变化的影响。缺体分析将不育基因定位在4B染色体上。 相似文献
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国外优良亚麻种质资源的初步筛选 总被引:1,自引:0,他引:1
对从国外引进的74份亚麻种质资源进行农艺性状、产量性状、抗倒伏性等方面的观测和评价,筛选出早熟资源2份,单株纤维产量高的资源6份,单株种子产量高的资源3份,长势好的资源7份,可作为育种材料和经进一步试验后供生产上使用。 相似文献
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《Industrial Crops and Products》2005,21(3):369-378
A flax fiber pilot plant is needed to process small samples of flax straw into fibers to facilitate research on retting and fiber properties. Our objective was to develop and test a modular design for a flax processing pilot plant based on a commercial line that was capable of cleaning fiber and seed flax straw from unretted, dew-retted, and enzyme-retted samples. The USDA Flax Fiber Pilot Plant (Flax-PP), which is the only research facility of this type in the United States, was designed according to the commercial ‘Unified Line’ (Czech Flax Machinery), but smaller and constructed in four individual modules. The modules and their order for processing were as follows: 9-roller calender, top shaker, scutching wheel, top shaker, 5-roller calender, and top shaker. Illustrations and diagrams of the operating modules are presented. Unretted ‘Neche’ linseed flax, dew-retted ‘Natasja’, and enzyme-retted ‘Jordan’ fiber flax were processed, and the cumulative weight loss of material at successive processing steps was determined to assess the effectiveness of cleaning. Fiber strength, fineness, and elongation were determined for the retted samples after cleaning through all the steps in the Flax-PP. A yield of fine fiber from the retted stems processed through the Flax-PP was acquired from further cleaning and refining by passage through a Shirley Analyzer. The various samples behaved differently at different stages of processing and the resulting fibers had different properties. The dew-retted Natasja fibers were stronger and finer than the enzyme-retted Jordan flax after pilot plant processing, but the Jordan fibers appeared cleaner and better retted. The Flax-PP effectively processed samples of diverse characteristics and will facilitate integrated research on retting methods for fibers with tailored properties. 相似文献