矮化中间砧红星苹果树各器官营养元素含量变化研究

研究表明,红星苹果树在年周期内各器官营养元素的含量变动很大,不同砧穗组合也有一定差异.矮化中间砧树叶片、果实和发育枝内多数营养元素含量高于乔砧树.红星苹果产量与叶内氮、磷的含量呈正相关,而与叶内钾的含量呈负相关.文中还讨论了营养元素在器官间存在的相关性.     

Cytological and genetical studies of a male sterile celery

Summary The inheritance and nature fo male sterility of a cerley (Apium graveolens L.) strain (MS1) is reported. Male sterility in MS1 is determined by a a recessive genotype for a single locus. Tests for linkage with the isozyme chromosome markers SDH-1 and PGM-1 were negative. MS1 male sterility was associated with a defective tapetum characterized by prominent vacuoles and premature degeneration. The stamens in the male sterile strain persisted in the flowers up to stigma receptivity, while in the male fertile plants they dropped before style expansion. The male sterile flowers produced normal amounts of nectar, resulting in cross pollination by various species of pollinators. It was estimated that the sterile strain produced 30% less seed than normal male fertile. Its possible use for hybrid celery seed production is discussed.Research supported by grants from the California Celery Research Board and BARD I-483-82.     

Cytoplasmic male sterility,resistance to gall mite and mildew,and season of leafing out in black currants

Summary Cytoplasmic male sterility (cms) is described in the F₁ hybrids Ribes × carrierei (R. glutinosum albidum × R. nigrum) and R. sanguineum × R. nigrum. In backcrosses to R. nigrum, progenies with R. glutinosum cytoplasm were either all male sterile, or segregated for full male fertility (F) and complete (S) and partial (I) male sterility. Ratios of F:I+S suggested that two linked genes controlled cms, F plants being dominant for one (Rf ₁) and recessive for the other (Rf ₂).Segregation for cms in relation to three linded genes, Ce (resistance to the gall mite, Cecidophyopsis ribes), Sph ₃(resistance to American gooseberry mildew, Sphaerotheca mors-uvae) and Lf ₁(one of two dominant additive genes controlling early season leafing out) indicated that Rf ₁and Rf ₂were in this linkage group. The gene order and approximate crossover values appeared to be: % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqef0uAJj3BZ9Mz0bYu% H52CGmvzYLMzaerbd9wDYLwzYbItLDharqqr1ngBPrgifHhDYfgasa% acOqpw0xe9v8qqaqFD0xXdHaVhbbf9v8qqaqFr0xc9pk0xbba9q8Wq% Ffea0-yr0RYxir-Jbba9q8aq0-yq-He9q8qqQ8frFve9Fve9Ff0dme% aabaqaciGacaGaamqadaabaeaafaaakeaacaWGdbGaamyzamaamaaa% baGaaiiiaiaacccacaGGWaGaaiOlaiaacgdacaGG0aGaaiiiaiaacc% caaaGaaiiiaiaacccacaGGGaGaamOuaiaadAgaliaaigdakmaamaaa% baGaaiiiaiaacccacaGGGaGaaiiiaiaaccdacaGGUaGaaiOmaiaacs% dacaGGGaGaaiiiaiaacccacaGGGaGaaiiiaaaacaWGsbGaamOzaSGa% aGOmaOWaaWaaaeaacaGGGaGaaiiiaiaacccacaGGGaGaaiiiaiaacc% cacaGGGaGaaiiiaiaacccaaaGaamitaiaadAgaliaaigdakmaamaaa% baGaaiiiaiaacccacaGGGaGaaiiiaiaacccacaGGGaGaaiiiaiaacc% cacaGGGaGaaiiiaiaacccacaGGGaaaaiaadofacaWGWbGaamiAaSGa% aG4maaaa!6E4D!\[Ce\underline { 0.14 } Rf1\underline { 0.24 } Rf2\underline { } Lf1\underline { } Sph3\]. Crossover values of 0.36 for Ce-Lf ₁, and 0.15 for Lf ₁-Sph ₃were estimated from the relative mean differences in season of leafing out between seedlings dominant and recessive for Ce and Sph ₃.It is suggested that competitive disadvantage of lf ₁-carrying gametes and/or zygotes at low temperatures may be implicated in the almost invariable deficit of plants dominant for the closely linked mildew resistance allele Sph ₃. Poor performance of lf ₁- (and possibly lf ₂-) carrying gametes and young zygotes during periods of low temperature at flowering might also account for the liability of some late season cultivars and selections to premature fruit drop (running off).     

油菜双隐性基因细胞核+广恢型细胞质雄性不育三系的选育方法及其遗传学基础

甘蓝型油菜双隐性基因细胞核 广恢型细胞质雄性不育(RRGCMS)三系综合了RM 5637A细胞质雄性不育和双隐性基因细胞核不育的优点.本文详细讨论了RRGcMS三系选育,繁殖和杂种生产的方法及其遗传学基础.     

矮败小麦群体改良的方法与技术

矮败小麦是具有矮秆基因标记的太谷核不育小麦. 根据轮回选择的基本原理和方法, 结合矮败小麦的特点, 我们逐步建立起一套简单易行的群体改良方法. 其主体技术包括组建一个好的基础群体, 利用控制授粉向群体引进优良基因, 通过开花前不良可育株的淘汰提高优良基因的频率, 借助于可育株与不育株的异交使基因重组, 以及正确地选     

小麦质核互作型雄性不育系线粒体DNA变异性的RAPD分析(英文)

在杂交小麦选育中,为了更好地利用细胞质雄性不育性,研究与不断挖掘新的不育细胞质类型及其对应育性恢复基因以改良现有不育资源至关重要.基于这一目的,本文对具有山羊草属细胞质的四类不育系线粒体DNA(mtDNA)进行了RAPD分析,分别比较了具有同一细胞质背景的山羊草、雄性不育系,以及该类不育系与恢复系组配的可育杂种F1的mtDNA的变异性.结果显示,供试山羊草与其对应细胞质雄性不育系在mtDNA上存在明显多态性,表明不育系在质核互作的影响下很可能已导致mtDNA发生变异:而不育系与对应的可育杂种F1在mtDNA上也存在多态性,同样表明育性恢复核基因对不育系进行育性恢复的过程中亦可能引起mtDNA发生相应变异;mtDNA变异很可能涉及到不育系育性本质的改变.     

高产优质甘蓝型核不育杂交种双油杂1号的选育

双油杂1号是河南省农业科学院经济作物研究所选育的高产优质半冬性隐性核不育甘蓝型油菜两系杂交种。该品种农艺性状优良、抗寒、抗倒伏、较耐菌核病、抗病毒病。在2年河南省油菜区域试验中平均单产2731.2kg/hm2,比对照杂98009增产8.58%。在河南省油菜生产试验中,双油杂1号平均单产2489.1kg/hm2,比对照杂交种杂98009增产3.93％。品质优良,芥酸含量0.1％,硫甙含量18.85μmol/g饼,含油量40.96％,品质符合国家标准。     

D2型细胞质光敏雄性不育小麦的初步研究

通过春季在田间分期播种,冬季在温室中不补光种植,研究了具有D2型细胞质(胞质供体为粗厚山羊草Ae.crassa)的Norin 26异质系在呼和浩特自然光生长条件下的育性表现.结果表明:(1)不同播期的Norin 26异质系在田间的不育株率均达到了100%;不育性在形态上表现为雄蕊心皮化.(2)三个播期的自交结实率分别为:3月28日播种的为40.85%(半不育),4月7日播种的为18.72%(高不育),4月17日播种的为0(全不育).(3)冬季不补光种植在温室中的Norin 26异质系的育性及自交结实均表现正常.     

偏型、粘型和易型小麦雄性不育系的初步研究

调查了10种不同山羊草(Aegilops)细胞质的异质小麦品种 Chris 与1B /1R 小黑麦易位系77(2)杂交 F_1及回交后代的育性表现,结果表明:1.在同核背景下,山羊草不同种的细胞质在对77(2)的育性反应上明显不同,依此差异进行特定的质核组配,能得到更宜于培育杂种小麦的新型不育系;2.不同的不育胞质在同核背景下虽都能产生雄性不育,但     

Genetic studies on the interspecific cytoplasm substitution lines of an Asian perennial strain of Oryza rufipogon Griff. and O. glaberrima Steud.

Summary It is shown that the restorer gene Rf _j extracted from the Japanese rice variety Akebono is effective on pollen restoration in the cytoplasm substitution line having the nucleus of Oryza glaberrima and japonica or indica cytoplasm of O. sativa, and is of the sporophytic type.The Asian perennial type of the wild rice species O. rufipogon is considered to be the progenitor of O. sativa. Two substitution lines having the cytoplasm of a perennial strain of O. rufipogon from Sri Lanka and the nucleus of O. glaberrima with or without the gene Rf _j in homozygous condition have been bred by means of successive backcrosses. These lines have now reached the BC₅ generation. Plants of the lines resemble morphologically the recurrent parent, but do not show pollen restoration, indicating that the cytoplasm of the rufipogon strain induced male sterility and that the gene Rf _j does not act as the restorer.