光敏核不育系轮回422S的选育     

李任华  王象坤  罗孝和  罗治华 《杂交水稻》1995,(6)

轮回４２２Ｓ（简称Ｎ４２２Ｓ）是从７００１Ｓ×轮回４２２的后代中系选而成的光敏核不育系。在北京、长沙以及连云港多年的观察表明，在长日低温条件下该不育系育性稳定，并且在北方具有３０ｄ以上的稳定不育期，由于该不育系在分类上属于粳亚种下的爪哇类型［２］，具有较理想的产量配合力，且杂种不落粒，在北方正在逐步替代偏籼的温敏不育系培矮６４Ｓ。  相似文献   

氮磷钾配施对鸦胆子养分吸收与分配的影响     

李林锋  吴小凤 《热带作物学报》2010,30(11):15-20

运用“3414”不完全正交回归设计,采用盆栽试验,研究了氮磷钾配施对鸦胆子养分吸收与分配的影响。结果表明,施氮处理显著提高了鸦胆子叶、茎、根氮浓度,其中叶氮浓度最高,但对磷和钾素的吸收影响不显著。土壤氮亏缺时,植物将较多的氮、磷和钾素分配到根部。供磷和供钾水平对鸦胆子氮、磷和钾素的吸收分配规律的影响均不显著,氮磷、氮钾和磷钾施肥处理之间的交互作用不明显,叶片氮、磷、钾浓度的大小受氮肥施用量的变化影响较大。不同施肥处理条件下,鸦胆子植株对磷的吸收量最多,钾次之,氮最少,其氮、磷、钾的吸收比例平均为1∶1.4  相似文献   

3种桉属植物乙醇抽提物对爪哇根结线虫的毒杀活性     

王惠惠  廖金铃  文艳华 《华中农业大学学报》2010,29(6):696-699

采用直接浸泡法,测定了桉属(Eucalyptus)植物柠檬桉(E.citriodora)、杂交桉(E.urophyla×E.grand)和尾叶桉(E.urophyla)小枝条乙醇抽提物对爪哇根结线虫(Meloidogyne javanica)卵孵化的抑制活性以及对2龄幼虫的毒杀活性。结果表明:柠檬桉、杂交桉和尾叶桉乙醇抽提物对爪哇根结线虫卵的孵化均有较强抑制活性,以20 mg/mL乙醇抽提物液处理24、48、72 h后,抑制孵化率均达94%以上;对爪哇根结线虫2龄幼虫也有较强的毒杀活性,3种桉属植物以20 mg/mL乙醇抽提物液处理2龄幼虫72 h后,线虫校正死亡率均达90%以上。将柠檬桉和杂交桉的茎、叶干粉分别拌土盆栽防治空心菜(Ipomoea aquatica)和黄瓜(Cucumis sati-vus)爪哇根结线虫病。结果表明:柠檬桉和杂交桉茎、叶干粉对爪哇根结线虫病均有较好的防治效果,植株根系的根结数、根结内雌虫数和雌虫产卵粒数均下降,植株地上部鲜质量增加,且均与对照差异显著。  相似文献   

鸦胆子组织培养技术研究     

李克烈  王荣香  陈伟  马千全  徐立 《热带农业工程》2011,(1):31-33

选用鸦胆子健壮幼嫩茎尖作为组培试验材料,进行组培快繁的研究。结果表明:诱导愈伤组织形成的培养基组合为MS+6-BA2mg/L+NAA0.2mg/L,有利于愈伤组织生长;不定芽分化的培养基为MS+6-BA0.5mg/L+NAA0.05mg/L,有利于不定芽的分化;1/2MS+NAA1mg/L有利于组培苗不定根的形成。  相似文献   

低钾逆境下根结线虫感染所诱导的番茄根巨型细胞的组织病理学反应   总被引：1，自引：0，他引：1  

袁林  方文珍  罗大民 《植物病理学报》2008,38(1):100-103

 Comparison of histopathological response and quantitative measurement of giant cell(GC) induced by Meloidogyne javanica in tomato root were studied under potassium-deficient(0.2 mmol/L K⁺) and replete conditions(control,6.0 mmol/L K⁺).K⁺-deficient stress did not impede the formation and maintenance of GC.The mean number of GC per feeding site as well as the mean diameter of GC did not differ between the treatments.However,the thickness of cell wall including components resulted from the accumulated polysaccharide and the length of cell-wall ingrowth increased 5-25 d after inoculation in K⁺-deficient as compared with K⁺-replete conditions.An increase of cell-wall ingrowth suggested a kind of compensational response to the potassium stress.  相似文献   

Antiphytoviral activity of bruceine-D from Brucea javanica seeds   总被引：1，自引：0，他引：1  

Shen JG  Zhang ZK  Wu ZJ  Ouyang MA  Xie LH  Lin QY 《Pest management science》2008,64(2):191-196

BACKGROUND: Brucea javanica (L.) Merr. is widely distributed throughout the southern parts of China and has been used in traditional medicine to treat a variety of diseases. The objective of the present study was to identify the active antiphytoviral compound in the seeds of B. javanica and evaluate the inhibitory activity of the compound against plant virus. RESULTS: Bioassay-guided fractionation of the most active extract from the seeds led to the isolation of an antiphytoviral compound which was identified as bruceine-D by conventional spectroscopy methods. The compound exhibited significant inhibitory activity against the infection and replication of tobacco mosaic virus (TMV), with IC(50) values of 13.98 and 7.13 mg L(-1) respectively. The compound also showed a strong inhibitory effect on the infectivity of potato virus Y (PVY) and cucumber mosaic virus (CMV). Furthermore, the compound could effectively inhibit systemic TMV infection in the host tobacco plant under glasshouse conditions.CONCLUSION: The results suggested that bruceine-D from Brucea javanica may have the potential to be used as a natural viricide, or a lead compound for new viricides.  相似文献   

低温下水芹对生活污水中氨氮、正磷酸盐的去除效果   总被引：1，自引：0，他引：1  

樊均德  陈靖  邓霞  许勤智  梅杰  胡亚超 《湖北农业科学》2016,(1)

通过设置3组不同浓度(100%、75%、50%)的生活污水,考察水芹(Oenanthe javanica)对污水中氨氮与正磷酸盐的去除效果。结果表明,在9~12℃的低温下,培养6 d时水芹对3种不同浓度污水中的氨氮和正磷酸盐的去除率分别为47.86%、59.34%、55.56%和44.42%、41.74%、32.95%。表明低温下水芹对生活污水中氨氮和正磷酸盐均有较好的去除效果。  相似文献   

秋水仙碱处理对鸦胆子幼苗生长的影响     

邓宇豪  曾国亮  李林锋 《安徽农业科学》2017,45(2)

[目的]探讨秋水仙碱处理诱导鸦胆子多倍体的可能性。[方法]以二倍体鸦胆子[Brucea javanica(L.)Merr.]为材料,用0.1%、0.3%、0.5%和1.0%的秋水仙碱对幼苗茎尖生长点进行点滴处理,研究其对鸦胆子生长的影响。[结果]0.1%、0.3%、0.5%、1.0%秋水仙碱处理不同程度地抑制了鸦胆子幼苗植株的生长速度,与对照植株相比,分别平均降低8.3%、36.4%、37.0%和55.4%。各处理鸦胆子幼苗叶片气孔保卫细胞纵径、横径、周长、等视野气孔数及叶绿粒数间存在显著差异;随处理浓度的增加,叶片气孔保卫细胞数减少,气孔变大,叶绿粒数增多。秋水仙碱顶芽生长点诱变处理后形成的瘤块严重影响诱变新梢次年生长。[结论]鸦胆子幼苗生长点秋水仙碱诱变处理获得多倍体植株的途径不可行。  相似文献   

Effect of soil sterilisation on biological control of Fusarium oxysporum f. sp. lycopersici and Meloidogyne javanica by antagonistic fungi and organic amendment in tomato crop     

M. W. Mwangi  W. M. Muiru  R. D. Narla  J. W. Kimenju  G. M. Kariuki 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2018,68(7):656-661

One of the major challenges in the application of biological control agents into the soil is their inability to withstand competition from natural microflora. In this study a management programme involving fungal biological control agents Trichoderma harzianum (TH) and Purpureocillium lilacinium (PL), and the organic amendment neem was carried out for the control of Meloidogyne javanica and Fusarium oxysporum f. sp. lycopersici (FOL). The experiment was carried out in sterile and non-sterile soil in order to test the efficacy of biological control in natural soil conditions. This experiment was repeated twice. A Wilcoxon's Signed-Rank test indicated there were no significant (P?<?0.05) differences in fusarium wilt control in sterile and non sterile soils in the treatments PL neem and TH neem, but there was significantly (P?<?0.05) higher control of M. javanica in the same treatments in sterile soils compared to non sterile soils. The combinations of fungal antagonists and neem were effective in non sterile as in sterile soils in the control of fusarium wilt, while being less effective in the control of M. javanica. Thus the biological control agents can be very effective in the control of fusarium wilt in natural conditions where the soil is not sterilised, but be less effective in the control of M. javanica in the same conditions. There is therefore potential of integrated management of fusarium wilt and root-knot nematodes (RKN) by these biological control agents in natural soil field conditions as an alternative to using chemicals.  相似文献   

鸦胆子提取物对菜青虫幼虫蛋白酶活性和蛋白质含量的影响   总被引：5，自引：0，他引：5  

曾涛  黎柳峰  韦德卫  陈海珊  刘演 《植物保护》2006,32(5):58-60

鸦胆子氯仿和乙酸乙酯提取物对菜青虫幼虫蛋白酶的活性和蛋白质含量均有明显影响。测定结果表明,在10 mg/mL浓度处理下,氯仿和乙酸乙酯提取物处理8～20 h蛋白酶比活力均明显低于对照组。24 h时氯仿提取物的蛋白酶比活力(0.306 92μg/mg.min)为对照组(0.187 75μg/mg.min)的1.634 3倍;乙酸乙酯提取物的蛋白酶比活力(0.100 06μg/mg.min)为对照组(0.390 12μg/mg.min)的0.256 5倍。24 h时氯仿提取物的蛋白质含量(44.403 mg/mL)为对照组(81.457 mg/mL)的0.5 451倍;乙酸乙酯提取物的蛋白质含量(64.500 mg/mL)为对照组(205.495 mg/mL)的0.3 139倍。  相似文献