共查询到19条相似文献，搜索用时 171 毫秒
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利用优质常规稻金麻粘转育优质杂交稻亲本的初步研究 总被引：4，自引：0，他引：4
利用优质常规稻品种金麻粘作为优质性状的基因供体,与两用核不育系安湘S杂交育成了两用核不育系611S,与恢复系HB85杂交育成了恢复系772。分别用611S和772配制的两系和三系杂稻组合的产量和米质性状达到和超过了优质米对照组合汕优63的水平。实践证明可通过育种手段转育优质米的优质性状至两用核不育系和恢复系上,从而选育出优质杂交水稻新组合。 相似文献
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安湘 S是国家杂交水稻工程技术研究中心郭名奇副研究员选育出的一个优质两用核不育系。 1994年通过了省级签定 ,1995年获科技术进步一等奖。为了摸索该不育系在我市的适用性及研究其利用价值 ,我公司 2 0 0 0年引进用安湘 S配组的 5个组合 ,并进行了安湘 S/早 2 5和安湘 S/ R66两个组合的试制 ,一共制5 2 .5亩 ,收获种子 4 80 0 kg,平均亩产 91.4 kg。现将其主要制种技术小结如下 :1 亲本特征特性安湘 S生育期属迟熟早稻类型的两用核不育系 ,通过 2 0 0 0年制种观察 ,在郴州 5月 2 0日至 6月 10日播种 ,播始历期 63～ 65 d。主茎叶片数 … 相似文献
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光敏、温敏核不育水稻核不育基因等位性及基因对数的研究 总被引：3，自引：0，他引：3
以光敏核不育系农垦58S及其衍生的光敏核不育系7001S、温敏核不育系W6154S、增矮64S，以及温敏核不育系安农S－1及其衍生的温敏核不育系810S、安湘S、香125S为材料进行相互杂交，在长日高温条件下观察F1的育性，根据其可育性和不育性确定核不育基因的等位性。结果表明：7001S、W6154S、培矮64S与核不育基因供体农垦58S之间有等位点的核不育基因；但温敏核不育系W6154S与培矮64S之间，不具等位点的温敏核不育基因。该结果说明光敏核不育系农垦58S至少存在一对光敏核不育基因和两对温敏核不育基因，而且各对温敏核不育基因可独立遗传，在夏季高温条件下其不育性得到充分表达。安农S－1与其衍生的不育系之间以及衍生的不育系与不育系之间都具有等位点的温敏核不育基因。农垦58S及衍生的核不育系与安农S－1及衍生的核不育系之间没有等位点的核不育基因。 相似文献
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水稻两用核不育系繁殖基地计算机选择系统研制与应用 总被引：2，自引：0，他引：2
为了解决水稻两用核不育系繁殖产量不高不稳、种子质量差、效益低的问题,利用全国740个气象站点50年的气象资料,应用计算机处理技术,开发了水稻两用核不育系繁殖基地计算机选择系统,并利用该系统筛选最适宜的水稻两用核不育系繁殖基地。该系统以同时满足不育系育性敏感安全期和抽穗扬花安全期光温条件为依据,采用Java语言编制而成。针对不育起点温度为22.0℃、22.5℃、23.0℃、23.5℃和24.0℃的水稻两用核不育系,分别筛选到24、29、20、21和22个安全系数优于海南三亚冬繁的基地,以上5种不育起点温度的水稻两用核不育系在最佳繁殖基地繁种成功概率分别可达83%、93%、100%、100%和100%。2010年,在应用本系统筛选到的云南保山繁种基地进行了不育起点温度为22.0℃的水稻两用核不育系C815S的繁殖,单产达8 437.5 kg hm-2,创造了我国水稻两用核不育系繁殖产量最高记录,证实采用该计算机系统选择两用不育系繁殖基地是有效的。因此,采用本系统筛选到的繁殖基地进行水稻两用核不育系繁殖,可望解决海南冬季繁殖风险大、产量不高、种子质量差以及冷水串灌繁殖产量不高不稳和效益低下的问题,值得推广应用。 相似文献
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随着水稻两用核不育系繁殖基地计算机选择系统的研制与应用,依据育性转换期和抽穗扬花期的温度,筛选出保山市为全国水稻两用核不育系最佳繁殖基地。分析了保山市水稻两用核不育系繁殖的有利条件,在繁殖实践的基础上提出了水稻两用核不育系安全高产栽培技术,同时对今后繁殖试验相关问题提出建议。 相似文献
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籼型水稻两用核不育系2136S的选育 总被引：4，自引：0，他引：4
在低纬度、高海拔的贵阳自然低温条件下,按照广适应性籼型水稻两用核不育系选育的光温指标进行严格鉴选,成功地选育出了具有起点温度低(23.5℃),稳定不育期长和可育期自交结实率高的籼型水稻两用核不育系2136S。本文报道了2136S的选育过程及其主要特性。 相似文献
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两系法杂交水稻应用研究概述 总被引：9，自引：0，他引：9
从两用核不育系育性转换规律、实用两用核不育系与广亲和系选育以及优势组合选配方面综述了两系法杂交水稻应用研究所取得的主要成就及最新进展。 相似文献
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几个温敏不育水稻品种组织培养特性的研究 总被引：3，自引：2，他引：1
以我国特有的温敏不育系籼稻品种安农S-1,及其转育的不育系安湘S和香125S为实验材料,对愈伤组织的诱导、继代和再生体系的建立进行了研究.结果表明:不同水稻品种和不同的外植体种类愈伤组织的诱导存在比较明显的差别:对成熟种子来说,安农S-1的愈伤组织诱导率最高;而对幼胚而言,香125S的诱导率最高.不同的水稻品种所适用的培养基不同,形成的愈伤组织的状态也存在差别,香125S所适用的培养基种类比较广泛,形成的胚性愈伤组织状态最好,也最容易形成.在愈伤组织的分化阶段,添加3 mg/L 6-BA 1 mg/L NAA分化成苗率最高;随继代时间的延长,愈伤组织的再生率下降,形成的幼苗的状态也存在明显的差别. 相似文献
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Developing rice lines possessing neutral alleles at sterility loci to improve the width of compatibility 总被引：3，自引：0，他引：3
To improve the width of compatibility for overcoming various sterilities in inter‐subspecific hybrid rice, some elite lines combining several sterility‐neutral genes were developed and the effects on mitigating various hybrid sterilities were tested. From Akihikari// IR36/Dular, neutral genes at ga11 and six sterility loci, S5, S7, S8, S9, S15 and S16, were combined and elite lines were obtained in their successive progeny. Four of the lines tested were confirmed to combine the neutral alleles S5‐n, S7‐n, S8‐n, S9‐n, S15‐n and S16‐n at the sterility loci and, among them, two harboured an additional gamete abortion‐neutral allele, ga11‐n. F1s, which used the lines and various testers as parents, mitigated the spikelet sterilities by six sterility loci and gamete abortion by a gametophyte gene, ga11. These lines could be selectively used as parents or donors to increase the width of compatibility of rice varieties for improving fertility in inter‐subspecific hybrid rice breeding. 相似文献
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High temperature‐induced grain sterility in rice is becoming a serious problem in tropical rice‐growing ecosystems. We studied the mechanism of high temperature‐induced grain sterility of different rice (Oryza sativa L) cultivars at two relative humidity (RH) levels. Four varieties of Indica and Japonica rice were exposed to over 85 % RH and 60 % RH at 36/30 °C, 34/30 °C, 32/24 °C and 30/24 °C day/night air temperatures from late booting to maturity inside sunlit phytotrons. Increasing both air temperature and RH significantly increased spikelet sterility while high temperature‐induced sterility decreased significantly with decreasing RH. Neither Indica nor Japonica rice types were superior to the other in the response of their spikelets to increased air temperature and RH. Increased spikelet sterility was due to increased pollen grain sterility which reduced deposition of viable pollen grains on stigma. Reduction in sterility with decreased RH was more due to decreased spikelet temperature than to air temperature. Thus the impact of RH should be considered when interpreting the effect of high temperature on grain sterility. Spikelet fertility was curvilinearly related to spikelet temperature. Grain sterility increased when spikelet temperature increased over 30 °C while it became completely sterile at 36 °C. The ability of a variety to decrease its spikelet temperature with decreasing RH could be considered as avoidance while the variability in spikelet sterility among varieties at a given spikelet temperature could be considered as true tolerance. 相似文献
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应用花培技术育成粳稻光敏核不育系1647S 总被引：1，自引：0，他引：1
用杂交育种和花药培养相结合的方法育成的光敏核不育系１６４７Ｓ，在北京平原地区有明显的育性转换期，在１５ｈ长光照条件下不育性稳定。该品系株型好，米质优良，配组优势较强，花培效率高，可以在华北平原北部稻区扩大配组试用，也宜作为优良的中介亲本应用。 相似文献
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Two species in genus Oryza, O. glaberrima and O. glumaepatula, are valuable and potential sources of useful genes of interest for rice improvement. However, the hybrid sterility between O. sativa and these two species is a main reproduction barrier when transferring the favorable traits/genes to mbox{O. sativa.} To overcome it, the nature of hybrid sterility should be understood further. The objective in the report is to map a new hybrid sterility gene as a Mendelian factor from O. glaberrima and analyze the co-linear of hybrid sterility S loci mbox{between} mbox{O. glaberrima} and mbox{O. glumaepatula} via comparative mapping approach. A BC2F2 population, derived from a single semi-sterility plant of BC2F1 of WAB56-104/ WAB450-11-1-2-P41-HB (WAB450-6) //WAB56-104///WAB56-104 was employed to map this pollen killer in O. glaberrima since WAB450-6 is a progeny of interspecific hybrid between O. sativa and O. glaberrima. A new pollen killer locus, S29(t) in O. glaberrima, was identified and mapped to interval between SSR marker RM7033 (1.1 cM) and RM7562 (1.3 cM) on rice chromosome 2. Comparative mapping indicated that S29(t) closely corresponded to S22 which is also a pollen killer gene in O. glumaepatula and is tightly linked with RFLP marker S910 on the short arm of rice chromosome 2. The good co-linear between S29(t) and S22 implied that there might exist common (orthologous) hybrid sterility loci controlled the reproduction barrier among AA genome species of genus Oryza, which will contribute significantly to our understanding of speciation and operation of hybrid sterility between O. sativa and its AA genome relatives. 相似文献
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Jiying Zhao Jing Li Peng Xu Jiawu Zhou Fengyi Hu Xianneng Deng Wei Deng Dayun Tao 《Euphytica》2012,187(3):339-344
Oryza longistaminata is an excellent gene pool to improve Asian cultivated rice Oryza sativa. However, hybrid sterility between O. longistaminata and O. sativa hinders application of desirable genes in rice production. In order to further understand the nature of interspecific hybrid sterility between these two species, near isogenic lines (NILs) were raised with RD23, an indica cultivar from Thailand, as background and an accession of O. longistaminata as donor. Using two NIL/RD23 F2 populations, a new pollen sterility gene, denoted as HYBRID STERILITY 44(t) or S44(t) in abbreviation, was mapped between simple sequence repeat markers RM5814 and RM20695 on the long arm of rice chromosome 6. The genetic pattern of S44(t) follows one-locus allelic interaction model. The interaction between S44(t)-sativa and S44(t)-longistaminata leads to partial abortion of male gametes carrying the allele of S44(t)-sativa in the heterozygotes, but the spikelet fertility is not affected by S44(t). 相似文献
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以克服亚种间杂种不育来充分发掘亚种间杂种优势是提高水稻单产的一条有效途径。本研究,从一套以日本晴为背景,9311为供体的染色体片段代换系中鉴定出一个系T9424,其与日本晴配置的F1植株小穗与花粉育性较双亲显著降低,双亲间存在不亲和。重测序结果表明T9424在第1、第4和第5染色体上导入9311片段。日本晴/T9424 F2群体内单株基因型及育性鉴定结果表明,T9424与日本晴间杂种不育基因位于第5染色体上。利用F2群体内790株单株将该杂种不育基因定位于第5染色体分子标记PSM8与A14之间110kb的物理区段内。对日本晴/T9424 F1植株花粉与胚囊育性鉴定结果表明该杂种不育基因同时控制雌、雄配子败育,将该基因暂命名为S39(t)。相关结果有助于加深对水稻亚种间杂种不育现象的认识,为该基因克隆及其育种利用奠定基础。 相似文献
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C. Ye S. Fukai I. D. Godwin H. Koh R. Reinke Y. Zhou C. Lambrides W. Jiang P. Snell E. Redoña 《Euphytica》2010,176(3):291-301
Low temperature is a major abiotic stress for rice cultivation, causing serious yield loss in many countries. To identify
QTL controlling low temperature induced spikelet sterility in rice, the progeny of F2, BC1F1 and BC2F1 populations derived
from a Reiziq × Lijiangheigu cross were exposed to 21/15°C for 15 days at the booting stage, and spikelet sterility was assessed.
For genotyping, 92 polymorphic markers from 373 SSR and 325 STS primer pairs were used. A major QTL was initially indentified
on the short arm of chromosome 10 by selective genotyping using highly tolerant and susceptible progeny from F2 and BC1F1
populations. The QTL (qLTSPKST10.1) was validated and mapped by genotyping the entire F2 (282 progeny) and BC1F1 (84 progeny)
populations. The results from the F2 population showed that qLTSPKST10.1 could explain 20.5% of the variation in spikelet
sterility caused by low temperature treatment with additive (a = 14.4) and dominant effect (d = −7.5). From the analysis of
98 selected BC2F1 progeny, the QTL located in the 3.5 cM interval between S10010.9 and S10014.4 was further confirmed. Based
on the studies of 3 generations in 2 years, it was clear that the QTL on chromosome 10 is a major determinant of the control
of low temperature induced spikelet sterility at booting stage. 相似文献