甘蓝型低芥酸黄籽油菜杂交种“黄杂2000-4”的特征特性研究

黄籽油菜含油量较黑籽油菜高,因而国内外都将黄籽油菜选育作为优质育种的目标之一[1,2,3,4]。我们课题组经过十多年的努力,在低芥酸黄籽油菜杂交种选育方面有了突破性进展,成功选育了甘蓝型低芥酸油菜杂交种黄杂2000—4。为了进一步明确该杂交种的推广利用价值,我们对黄杂2000-4的特征特性进行了研究。1材料与方法1.1材料黄杂2000-4属细胞质雄性不育三系杂交种,组合为1125A×1195C。其中1125A是由双低油菜D89与黄籽638杂交选育后代转育而成,1195C是由双低油菜84-16与黄籽油菜自交系杂交选育后代转育而成。1.2方法通过试验地和示范田的田间…     

Comparative Embryological Studies on Infertility of Interspecific Hybridizations Between Oryza sativa with Different Ploidy Levels and O. officinalis

As maternal parents, diploid (L202-2x) and autotetraploid (L202-4x) of Oryza sativa cv. L202 were crossed with O. officinalis. Embryo development and fertilization in these two crosses were comparatively studied. There were no mature hybrid seeds obtained because all the hybridized spikelets died 30 days after pollination. The main reasons for no seed set were abnormal fertilization and development of the embryos and endosperms in the interspecific hybrids. There were double- fertilization, egg cell single-fertilization and non-fertilization in these crosses. Although 59.45% and 54.87% of hybrid embryos produced in the crosses of L202-2x/O. officinalis and L202-4x/O. officinalis, respectively, hybrid embryos ceased to develop or degenerated and plenty of free endosperm nuclei were in disaggregating state without developing cellular endosperms three days after pollination. Besides, some embryological differences in these two crosses were found, that is, the rate of double-fertilization and total rate of double- and single-fertilization in L202-2x/O. officinalis were higher than those in L202-4x/O. officinalis. The embryo and endosperm of hybrids developed more slowly, and embryos and free endosperm nuclei were more severely degenerated in L202-4x/O. officinalis than in L202-2x/O. officinalis. Five days after pollination, a few of embryos in L202-2x/O. officinalis developed into pear-shaped ones, however, embryos in L202-4x/O. officinalis were all degenerated. Therefore, it is more difficult to obtain interspecific hybrids by wide crosses between autotetraploid of O. sativa and O. officinalis.     

如何选购肥育牛

1肉牛品种的选择选择原则:基于我国目前的市场条件,以生产产品的类型、可利用饲料资源状况和饲养技术水平为出发点。①选择生产性能高的肉用型品种。以生产小牛肉和高档牛肉为目的专业化规模肥育场,应尽量选择国外优良肉牛品种,或其一、二代杂交种,或三元、四元杂交种,或选择我国优良的黄牛品种如秦川牛、鲁西牛、南阳牛、晋南牛、延边牛、渤海黑牛等。不用回交牛和非优良的地方品种。有条件的企业也可组织杂交组合,或自行进行不同品种、杂交组合的肥育性能和肉质比较试验。成年牛肥育和     

高产高油抗病油葵杂交种晋葵5号的选育

晋葵5号是以雄性不育系76202－3A为母本，恢复系902－11R为父本组配选育而成，该杂交种抗旱、耐盐碱、耐瘠薄、耐菌核病能力强，含油率达51．44％，品种鉴定平均产量3823．5kg/hm^2，比对照品种汾葵杂3号增产13．9％，生产示范平均产量2056．5kg/hm^2，比对照品种晋葵2号增产17．0％，适宜高寒山区春播及麦茬复播。     

双低甘蓝型杂交油菜新品种华油杂62

介绍了双低甘蓝型油菜新品种华油杂62的品种来源、特征特性、产量表现及栽培技术要点。该品种2014年在民乐栽培面积达3200hm2,平均产量3975kg/hm2,表现综合性状优良,丰产性好。适宜在海拔2100~2600m的冷凉区种植。     

抗除草剂谷子杂交种长杂2号高产高效栽培技术研究

采用正交设计,对长杂2号的播期、施肥、留苗密度、种植方式4个因素的栽培技术进行了试验。结果表明,长杂2号在山西省中晚熟区取得高产的栽培方案是:最适播期5月20—25日,公顷留苗30万株左右,采用宽窄行种植方式。     

玉米新杂交种鲁单718的选育研究

简要介绍了玉米新杂交种鲁单718的选育背景、选育过程及品种特征特性等,对于鲁单718的成功选育提出了育种目标、选系技术与方法、杂种优势模式等方面的思路。     

黄金鲫健康养殖技术(上)

黄金鲫(图见彩中插2)属鲤形目、鲤科、鲤亚科、鲤属和鲫属的鲤、鲫杂交种。该品种外形如鲫鱼,体高,头小、头后背部隆起,体厚实丰满,有一对较短的吻须,无颌须,全身披鳞晶莹,排列整齐,侧线鳞31～34枚,体色金黄色,十分艳丽。我场自2001年以来历经7年推广试验,推广面积达6.3万亩,推广苗种5.1亿尾,在这几年的推广中已总结出一套较完     

高油早熟丰产油葵杂交种A15及制种技术

高油，早熟，丰产油葵杂交种A15是甘肃省农科院从法国引进，经多年试验示范，表现早熟，丰产，耐盐碱性强，含油率高。在1999-2001年的多点试验中，折合产量2899.5-4990.5kg/hm^2，较对照品种增产6.70%-56.40%。籽仁含油率64.03%。籽实（带壳）含油率52.93%，较抗霜霉病，锈病及白粉病，适宜在我省不同生态类型区与大多数中低秆作物间作套种，或在我省陇东，陇南等热量充足的地区复种，也适宜在内蒙古，宁夏，山西，新疆等油葵种植区种植。     

玉米自交系K12原种的保纯与创新

K12玉米自交系由西北农林科技大学农学院玉米所选育,其叶片上挺,综合性状优良,穗大,配合力和自身产量都较高.自育成以来,很快被各育种单位广泛应用.