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亚种间杂交稻结实特性研究进展 总被引:1,自引:0,他引:1
亚种间杂种优势的利用为水稻的产量进一步提高开辟了一条崭新的道路,但在生产中亚种间杂交稻常表现结实不良。本文综述了近年来亚种间杂交稻结实的遗传学、细胞学、生理生态学的研究进展,并指出了今后的研究方向。 相似文献
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两系亚种间杂交稻抑制型高产栽培法的初步研究Retardingcultureoftwo-linesystemintersubspecifichybridrice马国辉(湖南杂交水稻研究中心410125)两系亚种间杂交稻具有穗大、营养生长旺盛的显著特点,... 相似文献
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两系亚种间与品种间杂交稻籽粒充实度的比较研究 总被引:3,自引:0,他引:3
对两系杂交水稻的20个亲本材料、21个品种间杂种材料和53个亚种间杂种材料籽粒充实度方差分析结果表明:各类材料的籽粒充实度间的差异都达到极显著水平:谷粒充实率的变异系数为:两系亚间间杂种F1最大,亲本材料次之,两系品种间杂种F1最小;亲本材料的平均谷粒充实率显著小于亚种间杂种F1和品种间杂种F1的平均谷粒充实率,亚种间杂种F1的平均谷粒充实率与品种间杂种F1的平均谷粒充实率的差异不显著,并对解决两系灿粳亚种间杂交稻籽粒充实不良的途径进行了讨论。 相似文献
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选育水稻亚种间杂交组合的策略 总被引:55,自引:8,他引:55
选育水稻亚种间杂交组合的策略袁隆平(国家杂交水稻工程技术研究中心,长沙410125)选育高产亚种间杂交稻,从根本上说,就是要应用育种艺术,克服各种障碍,将水稻亚种间强大的生物杂种优势协调地转化为经济产量优势,特别是要把解决杂种结实率低而不稳和籽粒充实... 相似文献
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亚种间杂交稻大穗形成机理研究:颖花的形成特点 总被引:1,自引:0,他引:1
比较了亚种间杂交稻赣化7号与品种间杂交稻汕交优63的枝梗和颖花扮化及发育特性,分析了颖花的分析,发育及一、二次枝梗对大穗形成的作用,提出了增加颖花数的主攻方向。 相似文献
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籼粳亚种间杂交稻根系伤流强度的变化规律及其与叶片生理状况的相 … 总被引:5,自引:0,他引:5
对籼粳亚种间杂交稻Ⅱ优2070、Ⅱ优419及其恢复系2070、中419始穗后伤流液的变化进行了分析,结果表明亚种间杂交稻具有料高的要系活力,突出表现在始穗期至乳熟期,其后伤流液量明显下降且幅度较大,这种变化趋势与地上部不同叶位叶片光合速率、叶绿素含量和绿叶面积的变化相一致。 相似文献
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对亚种间杂交水稻广亲和系选育中的一些问题的讨论 总被引:9,自引:2,他引:7
对广亲和系的亲和谱和亲和力,亚种间杂种的育性稳定性和优势等问题进行了讨论,并阐述了广亲和系在亚种杂交稻上的应用途径。 相似文献
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Seventeen rice varieties and hybrids of different types (indica, japonica, javanica, indica hybrid, japonica hybrid and inter-subspecific hybrid) were evaluated to determine the effect of temperature on pollen fertility in inter-subspecfic hybrids. The pollen fertility of inter-subspecific hybrids was greatly reduced when average daily temperature dropped to 22.0 - 23.0℃ at meiosis stage, and the extent of pollen fertility reduction varied greatly with respect to different hybrids. However, the pollen fertility reduction of indica and japonica hybrids and conventional varieties was not obvious under the same regime of temperature conditions. When the average daily temperature dropped to 20℃, the pollen development of conventional varieties and hybrids was also affected. Correlation analysis revealed that there existed a positive correlation between pollen fertility and average daily temperature. A significant difference (P<0.01) was also found between the two correlation coefficients i.e. inter-subspecific hybrids and conventional varieties. Temperature at meiosis stage of pollen mother cell was a key factor in pollen developing, and the pollen fertility of inter-subspecific hybrids was more sensitive to low temperature than that of traditional variety. 相似文献
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Seventeen rice varieties and hybrids of different types (indica, japonica, javanica, indica hybrid, japonica hybrid and inter-subspecific hybrid) were evaluated to determine the effect of temperature on pollen fertility in inter-subspecfic hybrids. The pollen fertility of inter-subspecific hybrids was greatly reduced when average daily temperature dropped to 22.0 - 23.0℃at meiosis stage, and the extent of pollen fertility reduction varied greatly with respect to different hybrids. However, the pollen fertility reduction of indica and japonica hybrids and conventional varieties was not obvious under the same regime of temperature conditions. When the average daily temperature dropped to 20℃, the pollen development of conventional varieties and hybrids was also affected. Correlation analysis revealed that there existed a positive correlation between pollen fertility and average daily temperature. A significant difference (P<0.01) was also found between the two correlation coefficients i.e. inter-subspecific hybrids and conventional varieties. Temperature at meiosis stage of pollen mother cell was a key factor in pollen developing, and the pollen fertility of inter-subspecific hybrids was more sensitive to low temperature than that of traditional variety. 相似文献
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以籼稻保持系珍汕97B和粳稻保持系辽91B为亲本,构建了一个包含176个单株的F2群体及123个SSR标记的遗传图谱,在3种环境下联合检测控制花粉育性和小穗育性的QTL。共检测到3个控制花粉育性的主效应(加性效应和显性效应)QTL(qPF3、qPF5和qPF6)和4个控制小穗育性的主效应QTL(qSF3、qSF5、qSF6和qSF8),其中qPF5与qSF5、qPF6与qSF6均为同一个QTL,为重要的育性QTL。另外,检测到3对花粉育性和4对小穗育性QTL间互作,说明上位性效应对籼粳杂交后代的育性具有重要作用。 相似文献
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温度对亚种间杂种花粉育性的影响 总被引:12,自引:0,他引:12
以17个不同类型的籼、粳、爪哇型品种及其杂种为材料,通过分期播种,研究了温度变化对花粉育性的影响。结果表明,当花粉母细胞减数分裂期的日平均气温低于22~23℃时,亚种间杂种的花粉育性显著降低,不同组合花粉育性存在明显差异,而品种间杂种和常规品种的花粉育性受影响较小;当花粉母细胞减数分裂期的日平均气温低于20℃时,常规品种和品种间杂种的花粉发育也受到不同程度的影响,不同品种与组合间存在差异。花粉母细胞减数分裂期的日平均温度与花粉育性的相关性分析表明,温度与花粉育性呈显著正相关,亚种间杂种与常规品种的相关系数存在极显著差异。说明减数分裂期的花粉育性受温度影响,温度对亚种间杂种花粉育性的影响较常规品种大。关键词 相似文献
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水稻籼粳核质核杂种研究初探 总被引:2,自引:0,他引:2
籼质粳核核质杂种配普通籼稻,粳质籼核核质杂种配普通粳稻,以及这两种核质杂种互交F1,称之为核质核杂种.研究表明,核质核杂种既保持了或基本保持了籼粳稻亚种间的杂种优势水平,又克服了籼粳稻亚种间不亲和的问题、植株超高问题和不能正常抽穗等问题.探索了一条亚种间杂种优势利用的新途径. 相似文献