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为研究因子分析法在棉花区试中应用可行性,探讨湖北省麦后棉育种发展趋势.以近年参加湖北省区试麦后棉品种为实验材料,利用因子分析法和聚类分析法对14个品种的17个性状进行分析.通过因子分析,提取6个公因子,可解释全部性状信息的92.041％.其中第一、第四公因子为品质因子,第二公因子为生育期因子,第三公因子为株型因子,第五、第六公因子为产量因子.通过计算各品种的因子得分,发现虽然不同品种因子得分有正负差异,但是均为了提高产量或者改善品质.通过聚类分析,发现14个品种可以分为4个类群,第一类群为EZ12,ZS07,ZS03品种,这3个品种马克隆值均较低,纤维细度较好;第二类群为GB521,冈棉11号和华棉1543品种,这3个品种早熟性、产量及纤维品质等表现较好,综合性状表现较好;第三类群为荆棉93、晶华棉116、中棉所99001和福隆棉316品种,这4个品种丰产性好,有高产潜力;第四类群为荆PC10、荆棉94、中棉所94A1822和中9705品种,这4个品种早熟性好,株型较好,纤维品质较好.综合评价认为中9705、冈棉11号、ZS03、华棉1543的早熟性好、丰产、优质,是适应在湖北麦后棉推广的品种.湖北省麦后棉育种在关注产量同时,要协调产量与早熟、产量与品质、品质与早熟之间的矛盾,同时重视抗病性、抗逆性等性状. 相似文献
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转Bt基因抗虫棉中棉所30的产量及其构成因素研究 总被引：11，自引：1，他引：10
在稀植条件下(4.8万株·hm-2),与轮回亲本中棉所16相比,转Bt基因抗虫棉中棉所30的内围铃和下位铃比例较高,单株和单位面积的结铃数变化不大,但由于中棉所30的果节数减少,其单株成铃率增加。中棉所30下位铃的铃重略高于中棉所16,但上位铃和外围铃的铃重下降,全株平均铃重显著低于中棉所16。因此,中棉所30的子棉产量显著降低,而由于该品种的衣分大幅度提高,其皮棉产量与中棉所16持平。适当增加种植密度、“促源保库”是进一步提高Bt棉中棉所30产量的关键措施。 相似文献
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Systemic and asymptomatic Neotyphodium fungal endophytes infect numerous species of the Poaceae. The frequencies of Neotyphodium endophyte infection in Finland were investigated among and within seven Nordic cultivars of meadow fescue, Schedonorus pratensis (Huds.) P. Beauv., which is a widely grown pasture and forage grass species in Scandinavia. The cultivars were Kasper, Salten, Antti, Fure, Ilmari, Inkeri and Kalevi. Frequencies of infection of cultivars varied from endophyte-free cultivar Fure to highly infected cultivar Inkeri [mean (standard deviation of mean) of 0·95 (0·023)]. Mean frequencies of infection of three cultivars remained lower than 0·10, and two of the cultivars, Kasper and Salten, were intermediately infected. In most of the cultivars, frequencies of infection varied only slightly among seed lots. In cultivar Kasper, however, the frequency of endophyte infection was highly variable (0–0·96) among the 45 seed lots examined. The relative importance of cultivar, seed lot and infection by Neotyphodium endophyte to the aphid Rhopalosiphum padi L. was studied experimentally, using both endophyte-free and endophyte-infected plants of four seed lots of the two intermediately infected cultivars. Endophyte infection increased plant resistance to R. padi , overriding the influences of seed lot and cultivar. It is proposed that variation caused by endophyte infections in cultivars of meadow fescue should be taken into account in assessing plant breeding programmes in Europe. 相似文献
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Quynh-Hoa Pham Xuan-An Tran Thi-Nha-Trang Nguyen Thi-Thuy-Anh Tran Hai-Yen Hoang Thi-Hong-Van Nguyen Thi-Hanh Tang Thi-Phuc Do 《水稻科学》2016,23(6):334
Rice(Oryza sativa) is sensitive to salinity, but the salt tolerance level differs among cultivars, which might result from natural variations in the genes that are responsible for salt tolerance. High-affinity potassium transporter(HKTs) has been proven to be involved in salt tolerance in plants. Therefore, we screened for natural nucleotide polymorphism in the coding sequence of Os HKT1, which encodes the HKT protein in eight Vietnamese rice cultivars differing in salt tolerance level. In total, seven nucleotide substitutions in coding sequence of Os HKT1 were found, including two non-synonymous and five synonymous substitutions. Further analysis revealed that these two non-synonymous nucleotide substitutions(G50T and T1209A) caused changes in amino acids(Gly17Val and Asp403Glu) at signal peptide and the loop of the sixth transmembrane domain, respectively. To assess the potential effect of these substitutions on the protein function, the 3D structure of HKT protein variants was modelled by using PHYRE2 webserver. The results showed that no difference was observed when compared those predicted 3D structure of HKT protein variants with each other. In addition, the codon bias of synonymous substitutions cannot clearly show correlation with salt tolerance level. It might be interesting to further investigate the functional roles of detected non-synonymous substitutions as it might correlate to salt tolerance in rice. 相似文献
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马铃薯试管苗组织培养及微型薯诱导技术的研究 总被引：9，自引：2，他引：9
通过加入不同浓度的BA、NAA和KT,以探讨外源激素对马铃薯试管苗生理性状的影响,发现低浓度的外源激素较适合用来进行试管苗的增殖。本试验利用香豆素进行微型薯的诱导,结果表明低浓度的香豆素对提高薯重和大薯率有利,而高浓度有利于提高微型薯的结薯数量。 相似文献
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Russell Pressey 《American Journal of Potato Research》1969,46(8):291-297
Freshly harvested potatoes contain low levels of total invertase and high levels of invertase inhibitor. Total invertase increases sharply when potatoes are placed in cold storage, but the inhibitor is not depleted in all varieties. The absence of basal invertase activity in Norchip tubers indicates that an excess of invertase is not required for reducing sugar formation. Analyses of 37 varieties and seedlings after 3 months cold storage revealed that the reducing sugar content is not proportional to the invertase activity. High sugar contents are associated with low inhibitor levels, but low sugars are not necessarily associated with high inhibitor levels. The results indicate that invertase participates in reducing sugar formation, but other factors are responsible for the regulation of starch-sugar conversion in potatoes during cold storage. 相似文献
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Soomro MT Zahir E Mohiuddin S Khan AN Naqvi II 《Pakistan journal of biological sciences: PJBS》2008,11(2):285-289
In present study, Mn, Fe, Zn, Cu, Co, Pb, Cr, Ni and Cd were analyzed by FAAS in green and black tea samples of locally available in the Pakistani market. Na and K were also determined by Flame Photometer. Tea leaves can be the source of mineral components and trace elements, as well as some undesirable substances due to exposure to the environment. Among the metals tested, K was the most abundant one followed by Na, Mn and Fe. Fortunately, toxic heavy metals, Pb and Cd, had the lowest contents in tea samples and also in tea aqueous extracts. Concentration of heavy metals in tea aqueous extract was markedly lower than their total contents except that of K. The solubility of studied metals in tea aqueous extract varied widely and ranged from 0.0-95%. The lowest ranges of solubility were listed for toxic heavy metals Pb and Cd. The possible uptake of metals by the human body from tea aqueous extract has also been determined. The amounts of metals that one may take up through consumption of tea aqueous extract were found to match the acceptable daily intake even taking into account exposure from air, food and drinking water. 相似文献
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我国发展能源油料作物的策略分析 总被引：10，自引：5，他引：5
分析了国内外植物油脂的供需形势、我国耕地和边际地利用潜力、油脂植物资源的种属分布特点等,提出发展我国能源油料作物和生物柴油产业的3点建议：加大对边际地、油脂植物资源的调查等基础平台性研究,为政府决策和产业服务;加强产学研结合,形成研究、推广、产业的良性循环;制定能源植物推广应用优惠政策、推动能源油料作物生产发展。 相似文献
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我国香蕉深加工问题探讨 总被引：1，自引：0，他引：1
发展香蕉深加工是发展香蕉产业的重要途径。本文阐述香蕉的营养价值和经济价值，综述香蕉深加工研究进展，指出香蕉深加工中存在的问题，并提出发展对策。 相似文献