早熟抗稻瘟病籼型水稻不育系荣丰A的选育与利用   总被引：3，自引：0，他引：3  

刘振荣  柳武革  王丰  廖亦龙  黄慧君  符福鸿  黄德娟  朱满山 《杂交水稻》2006,21(6):17-18

荣丰A是广东省农科院水稻研究所用优ⅠB/博B的F4代优良株系与优ⅠA测交并连续回交转育而成的早熟抗稻瘟病籼型不育系,2005年10月通过广东省技术鉴定。荣丰A表现株型紧凑,不育性稳定,配合力强,抗稻瘟病,柱头外露率高,异交结实率高,对“九二○”敏感,易于繁制种。利用该不育系初步测配出杂交早稻荣优2号、荣优3号和荣优4号,在区试和试种中均比对照增产。  相似文献   

花生新品种粤油5号的选育研究   总被引：1，自引：1，他引：0  

梁炫强  李少雄  李一聪  黎穗临  周桂元  郑广柔  黎秀英 《花生学报》2003,32(2):12-15

早熟、耐寒、高产、抗锈病花生新品种粤油5号是以“粤油116”作为高产亲本材料，以国际半干旱作物所的早熟品种“ICGV8641”为早熟亲本，以美国引进种质“P1381622”为耐寒亲本，通过有性复合杂交，多世代轮回交替选择、定向选择和多点鉴定等方法培育而成。该品种1998年通过广东省品种审定，1999年被列为广东省重大科技成果推广项目并获全国农牧渔业丰收三等奖，2000～2001年连续两年被国家科技部列为国家重大科技成果推广项目，2002年获广东省科技进步三等奖。  相似文献   

不同熟性棉花品种的器官发育规律研究     

潘学标  邓绍华  蒋国柱  崔秀稳  庞明雄 《棉花学报》1992,(Z1)

对中熟品种中棉12,中早熟品种中棉17、早熟品种中棉16分别在露地上进行春播、晚春播、夏播试验,研究其生长发育规律。结果表明,与中熟品种相比,早熟品种的株高生长、主茎叶节发生、果枝伸展、蕾铃发育的相对速率都较快,因而按播种后相同热量单位比较,叶片所占的比例较小,蕾铃所占比例较大,相同单株干重下亦都有类似趋势。但早熟品种的单株生物量和经济产量均相对较小。结果还表明,早熟品种的生长发育速率较高,如适当增加其播种密度,可一定程度上弥补因生长季热量限制与植株小之不足所造成的损失,从而仍获得较高的皮棉产量和霜前花率。文中还建立了一些关系方程,对不同熟性品种生育习性进行了数量分析。  相似文献   

中国木本植物结实规律综述     

谭宏超  赵思俊  谭汝强 《林业调查规划》2020,45(3):38-41

对《中国木本植物种子》一书及多篇文献进行总结归纳,综述了中国木本植物花期、果实成熟期、结果期、果实脱落期、果实成熟到果实脱落时间等方面的规律。木本植物经过长期的自然选择,为适应复杂多变的环境,从基因水平形成了自我调控机制,生长、发育、繁殖和分布规律均受内、外2方面因子影响。外界环境因子的复杂多样致使植物各时期的表现型也复杂多样。  相似文献   

长江滩地杨树人工林主伐年龄的研究   总被引：1，自引：0，他引：1  

黄庆丰  孙启祥  吴泽民  项艳 《林业科学》2002,38(6):154-158

198 9～ 1 991年在安徽省怀宁县南埂林场营造项目杨树试验林 2 2 0ｈｍ2 ,根据杨树的生长特点及当地经济的要求现已进入主伐利用阶段。目前长江滩地杨树主伐年龄的研究仍是空白。确定林分的主伐年龄要综合考虑数量成熟、工艺成熟和经济成熟等多种因素 (盛炜彤等 ,1 991 ;丁贵杰  相似文献   

A new dominant earliness character of CMS line Zaoxian A and its application value in rice (Oryza sativa L.)   总被引：1，自引：0，他引：1  

Junhua Peng  Yuezhong He  Biaoxi Liu 《Euphytica》1995,81(3):235-244

Summary A distant cross between a maintainer Zhenshan 97B and an early maturing F₂ palnt of O. longistaminata x O. rufipogon was made in 1985, and a new CMS line Zaoxian A was bred in 1989 through continuous backcross of new maintainer plants derived from the distant cross to the leading CMS line Zhenshan 97A. Several experiments were carried out in Sichuan during 1990–1992, to analyze the inheritance of earliness of Zaoxian A and its application value to hybrid rice production. The results showed that Zaoxian A was as early-maturing as Zhenshan 97A, the earliness of Zaoxian A was incompletely dominant to the lateness of restorer lines, and was different from the earliness of Zhenshan 97A which was suppressed by the lateness of restorer lines. The F₁ hybrids between Zaoxian A and late maturing restorers combined the early maturity and high yielding capacity, and significantly outyielded the provincial and national checks with same or longer growth duration, because the larger genetic distance between early and late maturing ecotypes remained unchanged and the new earliness could express in F₁ generation. Therefore, the new dominant earliness character of Zaoxian A could enhance the regional and seasonal adaptability of rice. It is also valuable to hybrid rice production and the formation of new cropping systems with high yielding capacity and high economical profit.  相似文献   

短季棉花黄萎病田间分布型初步研究     

简桂良  马存 《棉花学报》1995,(2)

通过对短季棉重病田的研究表明，棉花黄萎病株在田间呈正态分布，对棉株产量影响大的重病株则呈负正态分布，而几乎绝产的枯死病株也呈负二项分布，说明危害棉花产量大的病株在田间呈聚集状态。  相似文献   

Resistance to late blight (Phytophthora infestans) in ten wild Solanum species     

L. T. Colon  D. J. Budding 《Euphytica》1988,39(Z3):77-86

Nineteen accessions of the tuber-bearing species Solanum berthaultii, S. chacoense, S. leptophyes, S. microdontum, S. sparsipilum, S. sucrense, S. venturii, S. vernei and S. verrucosum were tested for their resistance to late blight in two years of field experiments. Plants were artifically inoculated with zoospores of race 1.2.3.4.5.7.10.11 and the development of the disease was followed. Resistance ratings, calculated as the areas under the disease progress curves (ADPC), demonstrated a high resistance in all accessions except in S. sparsipilum, S. leptophyes and their interspecific hybrid. Segregations suggest that major genes for resistance are present in S. sucrense and S. venturii, and may also play a role in S. verrucosum. It is not yet certain wether the resistance of the other accessions is comparable to the partial and durable resistance of S. tuberosum cultivars like Pimpernel, as inheritance and mechanism have yet to be established. However, segregations suggesting the presence of single major genes with complete dominance were not found in these other accessions. Tuber initiation in the field occurred in only one accession, S. tuberosum ssp. andigena, and maturity of the clones was not related to their resistance. In the other accessions maturity types could not be assessed, as the clones require short day conditions for tuber initiation.  相似文献   

Recurrent selection for maturity and percent seed protein in Glycine max based on S0 plant evaluations     

Hongjun Xu  J. R. Wilcox 《Euphytica》1992,62(1):51-57

Summary Progress was evaluated after four cycles of recurrent selection among S₀ plants of Glycine max (L.) Merr. in which selection was either for maturity (MAT) or seed protein (PRO). The two populations, MAT and PRO, were developed from an initial population that was a combination of a line with 48.4% seed protein and two F₂ populations segregating for male sterility. Intermating was facilitated by genetic male-sterility and the selection intensity was 20% in each cycle of the two populations. Selection for early maturity advanced the average maturity a significant 2.7±0.34 days cycle^–1 and reduced seed yield a non-significant 9.1±2.95 g plant^–1 cycle^–1. Selection increased mean seed protein a significant 0.8±0.15 percentage points cycle^–1 and decreased percent seed oil a non-significant 0.5±0.17 percentage points cycle^–1. Correlation coefficients between seed protein and seed yield varied from 0.18 to –0.21 in the four cycles indicating plants with favorable combinations of seed yield and seed protein could be identified. Selection in these two populations would be effective for early maturity and for increased seed protein.  相似文献   

Alternative strategies of recurrent selection for seed yield of soybean     

Elcio P. Guimaraes  Walter R. Fehr 《Euphytica》1989,40(1-2):111-120

Summary Recurrent selection programs can be manipulated by varying either the extensiveness of testing used to identify superior lines or the number of intermating generations conducted among the superior lines between cycles of selection. The research was conducted to compare the performance of soybean (Glycine max (L.) Merr.) lines derived from populations developed by recurrent selection for seed yield using a factorial arrangement that combined one or two stages of replicated yield testing to identify superior lines with one or three generations of intermating among the selected lines. The base population AP6, which was used for this evaluation of alternative strategies of recurrent selection, was derived from 40 high-yielding strains of Maturity Groups 0 to IV. For this study, the 40 original parents of AP6 and the lines used as the parents for the most advanced cycle of selections for each of the strategies were evaluated in four Iowa environments. The number of cycles of selection completed for the strategies under evaluation varied from two to five. Strategies with two stages of replicated yield testing to select superior lines resulted in a larger number of high-yielding lines than when only one stage of testing was conducted. A larger number of high-yielding lines was obtained from strategies with one generation of intermating than when three generations were used. With the procedures used for the one-stage and two-stage tests in this study, the results indicated that an appropriate strategy for recurrent selection of seed yield in soybean would involve two stages of replicated yield testing to identify superior lines and one generation of intermating among the selected lines to form a new population.Journal Paper no. J-12025 of the Iowa Agriculture and Home Economics Experiment Station, Projekt 2475, Ames, IA.  相似文献