Chunyou 284 is a medium- japonica hybrid combination,as well as an indica-japonica subspecific hyrbid with super-high yield,which was developed from Chunjiang 23A,a thermo-sensitive CMS line with very early anthesis t...Chunyou 284 is a medium- japonica hybrid combination,as well as an indica-japonica subspecific hyrbid with super-high yield,which was developed from Chunjiang 23A,a thermo-sensitive CMS line with very early anthesis time,and C84,an indica-japonica intermediate type restorer line with wide compatibility.This combination has the advantages of high yield potential,early maturity,excellent comprehensive agronomic traits and wide adaptability.It was approved by Jiangsu Provincial Crop Variety Approval Committee in June,2018.The breeding process,main characteristics,cultivation techniques and seed production points of the combination were introduced.展开更多
[ Objective ] The paper was to study the density restriction effects of reproductive rate of rice brown planthopper （BPH） population in super indiea and japonica hybrid rice Yongyou 6. [Method] Different amounts of ...[ Objective ] The paper was to study the density restriction effects of reproductive rate of rice brown planthopper （BPH） population in super indiea and japonica hybrid rice Yongyou 6. [Method] Different amounts of rice brown planthoppor were released to super indiea and japonica hybrid flee Yongyou 6 during fillering, booting and gain filling stage, respectively. The reproductive rate and variation dynamics of rice brown planthoppor in super rice was also investigated and analyzed. [Result] Tillering stage： the population quantity of rice brown planthoppor during booting and gain filling stage gradually increased with the increasing basal amount of its population during tillering stage; when the population density of rice brown planthopper during grain filling stage reached a certain limit （ 〉 250 head/cluster）, the population density during milking stage showed decrease trend with the increasing of such density; the development of rice brown planthoppor population in super rice Yongyou 6 showed the characteristics of fast in middle and slow in two ends. Booting stage： the development of rice brown planthopper pop- ulation from booting to gain filling stage increased with the increasing basal amount of density, and their correlation during milking stage was not significant; flee brown planthopper population still had high reproduction capacity in the middle and late stage of super rice, which had latent risk on rice yield. Gain filling stage ： when population density of rice brown planthopper 〈 70 head/cluster, the development of it population increased with the increase of basal amount of density, which had great threat to yield. [ Conclusion] The result provided theoretical basis for establishment and improvement of monitoring early warning system, cost-ef- fective control of occurrence and damage of rice brown planthopper, and improvement of the sustained control ability against rice brown planthopper.展开更多
japonica rice is mainly distributed in Northeast China and accounts for 44.6% of the total cultivated area of japonica rice in China. The comprehensive using of inter-subspecies heterosis is the main breeding mode of ...japonica rice is mainly distributed in Northeast China and accounts for 44.6% of the total cultivated area of japonica rice in China. The comprehensive using of inter-subspecies heterosis is the main breeding mode of super japonica rice varieties in this region. Improving rice quality at relative high yielding level is the current research focus. Performing crosses between indica and japonica lines allows for the recombination of regulatory genes and genetic backgrounds, leading to complicated genetic rice quality characteristics, which can be used to explore patterns of quality improvement. In the present study, we utilize recombinant inbred lines （RILs） derived from indica-japonica hybridization to analyze the effect factors of rice quality derived from genetic factors, which contain both regulatory genes concerning rice quality and genetic backgrounds＇ random introduction frequency coming from indica （Di value）, and the improvement strategy was further discussed. The regulatory genes involved in amylase content （Wx） and nitrogen utilization efficiency （NRT1.1B） were the major factors affecting the amylose content （AC） and protein content （PC） in RILs, respectively. Both the Di value and the major grain width gene （GS5） had regulatory effects on milled rice width （MRW） in RILs, and their interaction explained the major variance of MRW in the RILs. With the mediation of MRW and chalkiness degree （C）, Di value had a further impact on head rice rate （HR）, which was relatively poor when the Di value was over 40%. In Northeast China, the Di value should be lowered by backcrossing or multiple crosses during the breeding of indica-japonica hybridization to maintain the whole better HR and further to emphasize the use of favorable genes in individual selection.展开更多
在大田条件下比较了5个超级稻品种和对照汕优63的物质生产及氮素吸收利用特性。结果表明,超级稻物质生产与积累优势始于拔节期,并随着生育进程而扩大,抽穗以后的干物质量积累优势明显。超级稻对氮素的吸收积累总量达196.5（184.3-200.8...在大田条件下比较了5个超级稻品种和对照汕优63的物质生产及氮素吸收利用特性。结果表明,超级稻物质生产与积累优势始于拔节期,并随着生育进程而扩大,抽穗以后的干物质量积累优势明显。超级稻对氮素的吸收积累总量达196.5（184.3-200.8）kg hm^-2,较对照的176.5kg hm^-2增加20.0kg hm^-2,其中拔节前与对照相当,拔节至抽穗期增加9.2kg hm^-2,抽穗至抽穗后25d增加4.9kg hm^-2,抽穗后25d至成熟期增加4.3kg hm^-2。氮素吸收速率拔节至孕穗阶段达最高峰,超级稻为3.68（3.44-3.96）kg N hm^-2d^-1,对照为3.55kg N hm^-2d^-1;孕穗期以后吸氮速率随着生育进程而逐渐下降,抽穗25d以后,对照基本不具再吸收能力,而超级稻仍具一定吸收能力（0.36kg N hm^-2d^-1）。超级稻生育中、后期氮素吸收利用能力的提高促进了抽穗和灌浆结实期植株特别是叶片含氮率的提高,孕穗期、抽穗期、抽穗后25d、成熟期叶片含氮率均与相应生育阶段的干物质积累量显著相关,与最终总生物量极显著相关。超级稻在10.5t hm^-2产量水平下的百千克籽粒吸氮量在1.83kg左右。展开更多
基金Supported by National Key R&D Program of China(2017YFD0100405)the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-ASTIP-201X-CNRRI)+3 种基金Independent Research Project of State Key Laboratory of Rice Biology(2017ZZKT10204)the Major Scientific Technological Project of New Varieties of Agriculture(Grain)of Zhejiang Province(2016C02050-5-1)the Fundamental Research Fund for China National Rice Research Institute(2017RG003-1)Breeding of High-yield Genetically Modified Rice Varieties(2016ZX08001004-001)
文摘Chunyou 284 is a medium- japonica hybrid combination,as well as an indica-japonica subspecific hyrbid with super-high yield,which was developed from Chunjiang 23A,a thermo-sensitive CMS line with very early anthesis time,and C84,an indica-japonica intermediate type restorer line with wide compatibility.This combination has the advantages of high yield potential,early maturity,excellent comprehensive agronomic traits and wide adaptability.It was approved by Jiangsu Provincial Crop Variety Approval Committee in June,2018.The breeding process,main characteristics,cultivation techniques and seed production points of the combination were introduced.
文摘[ Objective ] The paper was to study the density restriction effects of reproductive rate of rice brown planthopper （BPH） population in super indiea and japonica hybrid rice Yongyou 6. [Method] Different amounts of rice brown planthoppor were released to super indiea and japonica hybrid flee Yongyou 6 during fillering, booting and gain filling stage, respectively. The reproductive rate and variation dynamics of rice brown planthoppor in super rice was also investigated and analyzed. [Result] Tillering stage： the population quantity of rice brown planthoppor during booting and gain filling stage gradually increased with the increasing basal amount of its population during tillering stage; when the population density of rice brown planthopper during grain filling stage reached a certain limit （ 〉 250 head/cluster）, the population density during milking stage showed decrease trend with the increasing of such density; the development of rice brown planthoppor population in super rice Yongyou 6 showed the characteristics of fast in middle and slow in two ends. Booting stage： the development of rice brown planthopper pop- ulation from booting to gain filling stage increased with the increasing basal amount of density, and their correlation during milking stage was not significant; flee brown planthopper population still had high reproduction capacity in the middle and late stage of super rice, which had latent risk on rice yield. Gain filling stage ： when population density of rice brown planthopper 〈 70 head/cluster, the development of it population increased with the increase of basal amount of density, which had great threat to yield. [ Conclusion] The result provided theoretical basis for establishment and improvement of monitoring early warning system, cost-ef- fective control of occurrence and damage of rice brown planthopper, and improvement of the sustained control ability against rice brown planthopper.
基金sponsored by the National Natural Science Foundation of China(31371587,31430062)the Cultivation Plan for Youth Agricultural Science Technology Innovative Talents of Liaoning Province,China(2015035,2015036)the Program for Changjiang Scholars and Innovative Research Team in University,China(IRT13079)
文摘japonica rice is mainly distributed in Northeast China and accounts for 44.6% of the total cultivated area of japonica rice in China. The comprehensive using of inter-subspecies heterosis is the main breeding mode of super japonica rice varieties in this region. Improving rice quality at relative high yielding level is the current research focus. Performing crosses between indica and japonica lines allows for the recombination of regulatory genes and genetic backgrounds, leading to complicated genetic rice quality characteristics, which can be used to explore patterns of quality improvement. In the present study, we utilize recombinant inbred lines （RILs） derived from indica-japonica hybridization to analyze the effect factors of rice quality derived from genetic factors, which contain both regulatory genes concerning rice quality and genetic backgrounds＇ random introduction frequency coming from indica （Di value）, and the improvement strategy was further discussed. The regulatory genes involved in amylase content （Wx） and nitrogen utilization efficiency （NRT1.1B） were the major factors affecting the amylose content （AC） and protein content （PC） in RILs, respectively. Both the Di value and the major grain width gene （GS5） had regulatory effects on milled rice width （MRW） in RILs, and their interaction explained the major variance of MRW in the RILs. With the mediation of MRW and chalkiness degree （C）, Di value had a further impact on head rice rate （HR）, which was relatively poor when the Di value was over 40%. In Northeast China, the Di value should be lowered by backcrossing or multiple crosses during the breeding of indica-japonica hybridization to maintain the whole better HR and further to emphasize the use of favorable genes in individual selection.
文摘在大田条件下比较了5个超级稻品种和对照汕优63的物质生产及氮素吸收利用特性。结果表明,超级稻物质生产与积累优势始于拔节期,并随着生育进程而扩大,抽穗以后的干物质量积累优势明显。超级稻对氮素的吸收积累总量达196.5（184.3-200.8）kg hm^-2,较对照的176.5kg hm^-2增加20.0kg hm^-2,其中拔节前与对照相当,拔节至抽穗期增加9.2kg hm^-2,抽穗至抽穗后25d增加4.9kg hm^-2,抽穗后25d至成熟期增加4.3kg hm^-2。氮素吸收速率拔节至孕穗阶段达最高峰,超级稻为3.68（3.44-3.96）kg N hm^-2d^-1,对照为3.55kg N hm^-2d^-1;孕穗期以后吸氮速率随着生育进程而逐渐下降,抽穗25d以后,对照基本不具再吸收能力,而超级稻仍具一定吸收能力（0.36kg N hm^-2d^-1）。超级稻生育中、后期氮素吸收利用能力的提高促进了抽穗和灌浆结实期植株特别是叶片含氮率的提高,孕穗期、抽穗期、抽穗后25d、成熟期叶片含氮率均与相应生育阶段的干物质积累量显著相关,与最终总生物量极显著相关。超级稻在10.5t hm^-2产量水平下的百千克籽粒吸氮量在1.83kg左右。
