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WANG Xin-e ZHANG Cheng-he XUAN Shu-xin MAN Hong LIU Hai-he SHEN Shu-xing 《中国农业科学(英文版)》2008,7(6):656-663
Interspecific alien addition lines have played significant roles in gene mapping, intergenomic gene transfer and chromosomal homoeological identification between closely related species. Selection of alien addition lines was conducted by karyotype analysis and morphological observation with the reference of parents. Triploid interspecies hybrid （AAC, 2n = 3x = 29） was obtained from Brassica campestris ssp. chinensis var. parachinensis Qinglu 9601 （tetraploid, AAAA, 2n = 4x = 40） x B. oleracea var. alboglabra Baihua 9705 （diploid, CC, 2n = 2x = 18） by immature hybrid embryo culture in vitro. Five different alien monosomic addition lines （AA ＋ C2, AA ＋ C3, AA ＋ C4, AA ＋ C6, AA ＋ C7） were obtained from the backcross progenies of AAC x AA. Each alien monosomic addition line has some specific morphological characters. It is feasible to obtain alien addition lines from the progenies of AAC × AA by karyotype analysis and morphological observation based on the reference of parents 相似文献
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本试验通过对向日葵品种的染色体核型分析,得出2n=34=24m+6Sm(4SAT)+4St(4SAT)的结果。同已报道的某些向日葵品种染色体核型相比,最显著的差异表现在随体染色体数目上,本试验首次发现向日葵有4对染色体带有随体。 相似文献
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不同育苗基质对叶用莴苣（L.sativa var.crispa L.）苗生长的影响 总被引：7，自引：0，他引：7
系统地评价了蛭石，珍珠岩，砂，砻糠灰，煤渣，醋糠，木屑等基质在不同配合和配比条件下的有关基质处理在叶用莴苣育苗上的各自不同效果。研究结果表明，不同基质处理对出苗，成苗以及苗生长发育的影响具有显著的差异。 相似文献
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采用地理分布方法研究我国萝卜品种现状,结果表明:栽培萝卜品种和不完全显性性状主要分布在第Ⅲ栽培区(山东省、江苏省、安徽省及河南省)。通过分析酯酶同工酶酶谱及萝卜肉质根颜色性状变异最大的地区,表明第Ⅲ栽培区属于遗传变异中心。根据上述理由,依据瓦维洛夫的观点初步推断萝卜起源于黄淮平原和山东丘陵一带。 相似文献
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自然高温下耐热散叶莴苣（Lactuca sativa var.Creispa L.）品种的筛选 总被引：2，自引：0，他引：2
根据盛夏季节田间植株生长势以及抽薹性的表现状况，对有关国内外散叶莴苣种质进行了为期３年的观察比较研究，成功地筛选出了耐热与抗抽薹性部显著优于目前国内及本市主栽品种“广东软尾”与“翠叶”，并具有较高产量水平和增产作用十分显著的２个国内散叶莴苣品种－９５４７与９５４２，品比试验的研究结果表明，９５４７与９５４２具有高温下的长势旺，不易抽薹且产量水平较高的特性。 相似文献
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The methanol extract of Ficus sarmentosa var. henryi （King） Corner was found to detect potent inhibitory activities against 6 crop pathogenic fungi, Fusarium graminearum, Pumpkin fusarium Wilt, Curvularia lunata （Wakker） Boed, Septoria zeicola Stout, Botrytis cinerea, and Rhizoctonia solani. Four flavonoids were isolated from the extract of F. sarmentosa var. henryi by activity-guided fractionation and they were identified as eriodictyol （1）, homoeriodictyol （2）, dihydroquercetin （3）, and luteolin （4） by spectroscopic means and displayed excellent inhibitory activity against F. graminearum and S. zeicola. Among them, luteolin （4） showed the strongest inhibitory activity with IC50 values of 56.38 and 81.48 mg L^-1, to the fungi, respectively. The in vitro inhibitory activity of F. sarmentosa var. henryi （King） Corner was reported for the first time and the inhibitory action mechanism of luteolin （4） was worthy of further research. 相似文献
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西藏雅鲁藏布江中部流域发现的古青稞（Hordeun vulgare L.var … 总被引：5，自引：2，他引：3
本文报道了在西藏雅鲁藏布江中部流域昌果沟遗址发现的距今3500年新石器时代晚期的古青稞炭化粒,并对此进行了相关的讨论。 相似文献
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榛属（Corylus L.）植物抗寒性研究 总被引：3，自引：0，他引：3
应用电解质渗出率法、恢复生长法和组织褐变法对榛属４７份试材的抗寒性进行了分析研究。根据抗寒性和恢复生长后的萌芽百分率，筛选出１０个较抗寒的杂交品系，为杂交品系的区域试验和推广提供了依据。 相似文献
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在小麦及其亲缘属物种中进行赤霉病（Fusarium graminearum Schw.）抗性鉴定的结果表明，纤毛鹅观草[Roegneria ciliaris Trin （Nevski）（Agropyron ciliare Franchet，2n=28，SSYY]和鹅观草[R. Kamoji Ohwi （Agropyron tsukushiense（Honda）Ohwi var. Transiens （Hack.）Ohwi，2n=42，SSHHYY]是迄今为止筛选出的对赤霉病抗性最高的物种。为将这一抗性转移到普通小麦中去，进行了它们与普通小麦的属间杂交。运用杂种幼胚培养技术，成功地获得了纤毛鹅观草（♀）×普通小麦品种中国春（♂）、中国春（♀）×鹅观草（♂）以及鹅观草（♀）×中国春（♂）3个组合的属间杂种，其中后两个组合为迄今首次成功的报道。根尖细胞染色体计数表明前两个组合F#-1均具有预期的染色体数（分别为2n=35和2n=42），而在鹅观草（♀）×中国春（♂）F#-1中，除2n=42的预期类型外，还发现有2n=63的异常类型。预期类型F#-1形态均呈中间型，2n=63异常类型偏向于中国春。所有
F#-1均完全雄性不育。离体鉴定表明它们对赤霉病仍然表现高抗。花粉母细胞减数分裂中期Ⅰ平均染色体配对构型分别为：（纤毛鹅观草×中国春）F#-1，30.47Ⅰ+2.22Ⅱ+0.01Ⅲ；（中国春×鹅观草）F#-1，39.82Ⅰ+1.09Ⅱ；（鹅观草×中国春）F#-1预期类型（2n=42），39.76Ⅰ+1.09Ⅱ+0.10Ⅲ；异常类型（2n=63），27.11Ⅰ+17.63Ⅱ+0.09Ⅲ+0.08Ⅳ。用中国春回交，所有F#-1均获得了回交后代。 相似文献
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Effects of Chlorine Dioxide Gas on Postharvest Physiology and Storage Quality of Green Bell Pepper （Capsicum frutescens L. var. Longrum） 总被引：1，自引：0，他引：1
The effects of treatment of chlorine dioxide (ClO2) gas on postharvest physiology and preservation quality of green bell peppers were studied. Green bell peppers were collected in bags and treated with 0, 5, 10, 20, and 50 mg L-1 ClO2 gas at 10 ± 0.5℃ for over 40 d, and the changes in postharvest physiology and preservation quality of the peppers were evaluated during the storage. The inhibition of rot of the peppers was observed for all the tested ClO2 gas treatments. The rot rates of the treated samples were 50% lesser than those of the control after day 40 of storage. The highest inhibitory effect was obtained after 50 mg L-1 ClO2 gas treatment, where the peppers did not decay until day 30 and showed only one-fourth of the rot rate of the control at day 40 of storage. The respiratory activity of the peppers was significantly (P ＜ 0.05) inhibited by 20 and 50 mg L-1 ClO2 treatments, whereas no significant effects on respiratory activity were observed with 5 and 10 mg L-1ClO2 treatments (P＞ 0.05). Except for 50 mg L-1 ClO2, malondialdenyde (MDA) contents in the peppers treated with 5,10, or 20 mg L-1 ClO2 were not significantly (P＞0.05) different from those in the control. Degradation of chlorophyll in the peppers was delayed by 5 mg L-1 ClO2, but promoted by 10, 20, or 50 mg L-1 ClO2. The vitamin C content, titratable acidity,and total soluble solids of the peppers treated by all the tested ClO2 gas did not significantly change during the storage.The results suggested that ClO2 gas treatment effectively delayed the postharvest physiological transformation of green peppers, inhibited decay and respiration, maintained some nutritional and sensory quality, and retarded MDA accumulation. 相似文献
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YU Xiao-xia ZHAO Ning LI Hui JIE Qin ZHAI Hong HE Shao-zhen LI Qiang LIU Qing-chang 《农业科学学报》2014,13(2):310-315
Sweetpotato （Ipomoea batatas （L.） Lam.） breeding is challenging due to its genetic complexity. In the present study, interval mapping （IM） and multiple quantitative trait locus （QTL） model （MQM） analysis were used to identify QTLs for starch content with a mapping population consisting of 202 F1 individuals of a cross between Xushu 18, a cultivar susceptible to stem nematodes, with high yield and moderate starch, and Xu 781, which is resistant to stem nematodes, has low yield and high starch content. Six QTLs for starch content were mapped on six linkage groups of the Xu 781 map, explaining 9.1-38.8% of the variation. Especially, one of them, DMFN 4, accounted for 38.8% of starch content variation, which is the QTL that explains the highest phenotypic variation detected to date in sweetpotato. All of the six QTLs had a positive effect on the variation of the starch content, which indicated the inheritance derived from the parent Xu 781. Two QTLs for starch content were detected on two linkage groups of the Xushu 18 map, explaining 14.3 and 16.1% of the variation, respectively. They had a negative effect on the variation, indicating the inheritance derived from Xu 781. Seven of eight QTLs were co-localized with a single marker. This is the first report on the development of QTLs co-localized with a single marker in sweetpotato. These QTLs and their co-localized markers may be used in marker-assisted breeding for the starch content of sweetpotato. 相似文献