共查询到20条相似文献，搜索用时 750 毫秒
1.
2.
3.
杂交中稻再生力与头季稻农艺性状的相关性研究 总被引：6，自引：1，他引：6
为探明杂交中稻再生力与头季稻农艺性状的关系，给强再生力品种（组合）的选择提供依据，选用229个杂交组合，经3次试验，再生力与头季稻性状的相关及通径分析表明，⑴能体现碳水化合物遗留量的成熟期单茎茎鞘干重，对再生力的直接效应最大或接近最大，两者呈极显著正相关，且其回归方程具较好的预测功能，故可将茎鞘干重作为衡量杂交中稻组合再生力的重要指标。⑵对群体生态环境影响较大的穴有效穗数，与再生力的简单负相关均不显著，偏相关却均极显著，直接效应亦较大，显示其是影响再生力的重要性状。⑶与再生力呈负相关的株高、剑叶长度、穗着粒数、穗实粒重、成熟期以及呈正相关的分蘖力，3次试验的效应均不一致，说明它们对再生力的影响不够稳定。 相似文献
4.
再生稻高产种质资源是选育强再生力水稻品种的物质基础,缺乏具有强再生力的水稻品种是制约再生稻发展的重要因素之一。引进247份早抽穗水稻核心种质在江汉平原作再生稻种植,从中筛选高产再生稻种质资源,并探究高产再生稻产量形成的关键因素,为再生稻种质资源创新及新品种选育提供基础材料和理论依据。结果表明,247份核心种质在江汉平原两季稻均能正常抽穗成熟,各农艺性状变异系数在10.31%~51.83%,从中筛选出27份高产水稻种质资源。其中,4份双季高产种质两季总单株产量均超过60.00g,可作为亲本用于水稻再生力基因挖掘和再生稻高产育种。再生稻高产群体产量构成分析表明,提高再生稻产量的关键是提高其每穗颖花数和有效穗数;再生稻高产种质头季稻产量与再生季稻产量呈极显著负相关,表明再生稻高产育种方向应从追求单季高产转变为追求周年高产。 相似文献
5.
再生稻种植产量差形成的研究 总被引：3，自引：0，他引：3
为明确安徽省沿江地区再生稻种植产量差形成的原因,筛选出该地区适宜的再生稻种植品种,以9个杂交水稻品种为试材,比较分析了其头季和再生季生育期、再生力、产量及其构成因素等性状。结果表明,在产量构成因素中,造成不同品种头季稻产量差异的主要因素是单位面积上的有效穗数;导致再生季产量差异的主要因素是单位面积上有效穗数和每穗着粒数。准两优608再生季单产5.27 t/hm~2,2季综合产量高达13.59 t/hm~2,可作为该地区再生稻种植的优选品种;皖稻119和新两优6号头季产量高,再生力较强,再生季产量潜力大,可以作为该地区再生稻种植的候选品种。研究表明,生产中可通过增加单位面积上有效穗数,主攻大穗,并在维持较高结实率的基础上提高千粒质量以实现再生季产量增加和获得2季综合高产。 相似文献
6.
湖南双季稻区杂交中稻最佳播期初探 总被引：1，自引：0，他引：1
对汕优63等4个杂交中稻组合进行分期播种期试验,其结果表明：株高与播种期为二次曲线相关;颖花数与播种期呈负相关,单位面积产量与播种期用多项式逼近法模拟为一双峰曲线,以4月10日播种为最高点,5月28日播种为次高点。同时,对杂交稻组合的最佳播种期及湖南双季稻区杂交中稻高产最佳播种期进行了讨论,提出了4月10日是湖南双季稻区部分杂交中稻组合高产最佳播种期,5月28日为优质高产兼顾的最佳播种期。 相似文献
7.
利用杂交中稻培育再生稻是一种费省效宏的稻田种植制度,自1986年在四川省大面积推广以来,已取得了巨大的社会、经济效益。由于再生稻生育期短,再生芽的萌发及生长在很大程度上要依赖于头季稻母茎的养分贮藏,为了再生稻的稳产、高产,必须要种好头季稻,尤其是头季稻后期的生长发育。而赤霉素具有延长叶片功能期,提高光合强度,打破休眠,促进萌发等功效,如何把它应用于杂交中稻,使之 相似文献
8.
9.
再生稻高产栽培技术讲座：第二讲 再生稻高产栽培技术 总被引：1，自引：0，他引：1
再生稻高产的基础是种与头季稻中稻-再生稻这种制度的发展,要以两季高产稳产为目标。必须种好头季稻,不仅因为两季高产头季是关键,而且因为再生稻的生育是头季稻的延续,要使再生稻高产,必须以种好头季稻为基础。这里不去全面分析头季稻高产的原理与技术,面仅仅就与再生稻密切相关的几个方面加以讨论。 相似文献
10.
浅谈杂交中稻的再生利用 总被引：1，自引：0，他引：1
简述了杂交中稻再生利用的发展概况及发展前景，充分利用光、热、水、土、肥资源，提出了选用再生力强的高产品种。高产稳产途径为地膜育秧适期早播，做到头季避开伏旱，再生季躲过低温，保证两季高产；施好促芽肥，保证休眠芽成活与早生快发；高留稻桩，保留倒二、三节蘖芽再生利用。 相似文献
11.
G. H. Kroon 《Euphytica》1994,76(1-2):125-125
Summary
K x vadensis is a hybrid of K. blossfeldiana and K. marmorata obtained after doubling the number of chromosomes. 相似文献
12.
Jens Jensen 《Euphytica》1979,28(1):47-56
Summary The high-lysine gene in Risø mutant 1508 conditions an increased lysine content in the endosperm via a changed protein composition, a decreased seed size, and several other characters of the seed. The designation lys3a, lys3b, and lys3c, is proposed for the allelic high-lysine genes in three Risø mutants, nos 1508, 18, and 19. Linkage studies with translocations locate the lys3 locus in the centromere region of chromosome 7. A linkage study involving the loci lys3 and ddt (resistance to DDT) together with the marker loci fs (fragile stem), s (short rachilla hairs), and r (smooth awn) show that the order of the five loci on chromosome 7 from the long to the short chromosome arm is r, s, fs, lys3, ddt. The distance from locus r to locus ddt is about 100 centimorgans. 相似文献
13.
Hongyan WEI Jian ZHOU Jinguang LU Jingzheng SONG Qiongxi YU Zhihong JIANG 《Medicinal Plant》2019,(6):27-29
[Objectives]This study aimed to establish a QAMS(quantitative analysis of multi-components by single-marker)method for simultaneous determination of four phenol... 相似文献
14.
Summary Avoidance of rust fungi that was based on poor appressorium induction was previously found in Hordeum chilense. In the present study 95 accessions of Triticeae were screened for avoidance of Puccinia hordei. The percentage of appressorium formation per germinated spore ranged from 6 to 90%. On none of the 41 accessions of Aegilops, Agropyron, Elymus, Secale, Thinopyrum or Triticum studied was the rate of appressorium formation lower than 25%. Lower rates of appressorium formation were, however, found on accessions of wild barley species Hordeum brachyantherum, H. marinum, H. parodii and H. secalinum. Its implications in cereal breeding are discussed. 相似文献
15.
D. A. Bond G. J. Jellis G. G. Rowland J. Le Guen L. D. Robertson S. A. Khalil L. Li-Juan 《Euphytica》1993,73(1-2):151-166
Progress is being made, mainly by ICARDA but also elsewhere, in breeding for resistance to Botrytis, AScochyta, Uromyces, and Orobanche; and some lines have resistance to more than one pathogen. The strategy is to extend multiple resistance but also to seek new and durable forms of resistance. Internationally coordinated programs are needed to maintain the momentum of this work.Tolerance of abiotic stresses leads to types suited to dry or cold environments rather than broad adaptability, but in this cross-pollinated species, the more hybrid vigor expressed by a cultivar, the more it is likely to tolerate various stresses. 相似文献
16.
Chunli TANG Fengxian ZHAO Hongxia CHEN Jiabao MA Jiangcun WEI Meiyan QIU Zhen XIE 《Medicinal Plant》2019,(6):60-65
[Objectives]To optimize the water extraction process of Chinese Herbal Compound Man Gan Ning and establish a method for its extraction and content determination... 相似文献
17.
Mohammed Riyazaddin Polavarapu B. Kavi Kishor Are Ashok Kumar Belum V. S. Reddy Rajendra S. Munghate Hari C. Sharma 《Plant Breeding》2015,134(4):423-436
Sorghum shoot fly, Atherigona soccata, is one of the important pests of postrainy season sorghums. Of the 90 sorghum genotypes evaluated for resistance to this pest, RHRB 12, ICSV 713, 25026, 93046 and 25027, IS 33844‐5, Giddi Maldandi and RVRT 3 exhibited resistance in postrainy season, while ICSB 463, Phule Anuradha, RHRB 19, Parbhani Moti, ICSV 705, PS 35805, IS 5480, 5622, 17726, 18368 and 34722, RVRT 1, ICSR 93031 and Dagidi Solapur showed resistance in rainy season, suggesting season‐specific expression of resistance to A. soccata. ICSB 461, ICSB 463, Phule Yasodha, M 35‐1, ICSV 700, 711, 25010, 25019 and 93089, IS 18662, Phule Vasudha, IS 18551 and 33844‐5 and Barsizoot had fewer deadhearts than plants with eggs across seasons, suggesting antibiosis as one of the resistance mechanism. Five genotypes exhibited resistance with high grain yield across seasons. Correlation, path and stepwise regression analyses indicated that leaf glossiness, seedling vigour, trichome density, oviposition and leaf sheath pigmentation were associated with the expression of resistance/susceptibility to shoot fly, and these can be used as marker traits to select and develop shoot fly‐resistant sorghums. 相似文献
18.
E. Keep 《Euphytica》1986,35(3):843-855
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). 相似文献
19.
[Objectives] To determine the optimum extraction technology for total phenols of leaves in Acanthopanax giraldii Harms.[Methods]The single factor test and ortho... 相似文献
20.
Summary
Hordeum chilense is a wild barley extensively used in wide crosses in the Triticeae. It could be a valuable source of resistance to Fusarium culmorum and Septoria nodorum. Some H. chilense x Triticum spp. amphiploids, named tritordeums, were more resistant than the parental wheat line to these diseases, others were not. Average contents of ergosterol and deoxynivalenol (DON) suggested that resistance to colonization by Fusarium was the highest for Hordeum chilense, followed by tritordeum and wheat in decreasing order. In particular, the H. chilense genotypes H7 and H17 enhanced the wheat resistance to F. culmorum in its tritordeum offsprings. Resistance to S. nodorum in tritordeum was not associated with tall plant height. There is sufficient genetic variation for resistance to F. culmorum and S. nodorum among tritordeum to allow the breeding of lines combining short straw and resistance to both diseases. 相似文献