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NGUYEN HUU HONG TRAN DANG XUAN TSUZUKI EIJI MITSUHIRO MATSUO OGUSHI YUICHI 《Weed Biology and Management》2002,2(3):143-147
Kava is a perennial pepper plant from the Oceanic region, which is commonly used as a drink by natives and for pharmacological purposes. Results of this study concluded that Kava has allelopathic potential and suppressed germination and growth of lettuce ( Lactuca sativa L), barnyardgrass ( E. crus-galli Beauv var. formosensis Ohwi.), and duck-tongue weed ( M. vaginalis Presl var. plantaginea Solms-Laub.) Moreover, Kava inhibited emergence of weeds in paddy soils. The inhibition of Kava became stronger as the applied concentration increased. In a greenhouse experiment, Kava had the greatest inhibition on emergence and weed growth in paddy soils when a dose of 1 ton ha−1 of Kava was divided and applied at 3, 16, and 23 days after watering. Inhibition by Kava varied among weed species. Results from this study suggest that Kava might be useful for weed control in rice or reduce dependence on herbicide. 相似文献
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多花黑麦草遗传连锁图的构建 总被引：6，自引：0，他引：6
利用多花黑麦草(Loliummu ltiflorum)细胞质雄性不育(CMS)F1群体(124个个体),以来自父本和母本的分离位点采用SSR、AFLP、EST-CAPS(表达序列标签酶切扩增多态性)和RGA-CAPS(抗病基因类似物酶切扩增多态性)等标记方法进行多态性的选择并对父、母本分别构建遗传连锁图。母本连锁图包含362个标记位点,分别包含SSR标记240个、AFLP标记84个、EST-CAPS标记24个和RGA-CAPS标记14个,由7个连锁群组成,覆盖全长776.4cM,各连锁群长度在85.8至135cM之间,相邻标记之间的平均距离为2.14cM;父本7个连锁群,包含376个标记,其中SSR标记252个、AFLP标记82个、EST-CAPS标记29个和RGA-CAPS标记13个,连锁图全长710.0cM,相邻标记之间的平均距离为1.89cM;标记密度高、标记分布均匀、连锁图长度中等。 相似文献
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Utilization of dissolved organic phosphorus by the two toxic dinoflagellates,
Alexandrium tamarense and Gymnodinium catenatum (Dinophyceae) 总被引：2，自引：0，他引：2
SEOK JIN OH TAMIJI YAMAMOTO YUKIHIRO KATAOKA OSAMU MATSUDA YUKIHIKO MATSUYAMA YUICHI KOTANI 《Fisheries Science》2002,68(2):416-424
ABSTRACT: The utilization of dissolved organic phosphorus (DOP) by the two toxic dinoflagellates Alexandrium tamarense (Lebour) Balech and Gymnodinium catenatum Grahamm which were isolated from Hiroshima Bay, Japan, was studied. Alexandrium tamarense grew poorly on fructose-6-phophate, glucose-1-phosphate, glycerophosphate, and ribose-5-phosphate with a phosphomonoester bond, although it grew well on the nucleotides adenosine-5-diphosphate (ADP) and adenosine triphosphate (ATP), as well as on dissolved inorganic phosphorus (DIP; as metaphosphate, pyrophosphate, tripolyposphate and orthophosphate). The results imply that A. tamarense was able to utilize DOP and DIP from ambient water using nucleotidase, pyrophosphatase and poly-phosphatase, which hydrolyze phosphodiesters. In contrast, G. catenatum was able to utilize DOP compounds of various molecular weights and structures as well as DIP. In time-course experiments, alkaline phosphatase activity (APA) was induced at orthophosphate concentrations of 0.43 mmol/L and 3.3 mmol/L for A. tamarense and G. catenatum , respectively, and APA increased with orthophosphate depletion. The experiments also demonstrated that APA was maximum at the optimum temperatures for the growth of A. tamarense and G. catenatum ; that is, 15°C and 25°C, respectively. These results suggest that the DIP-depleted conditions in Hiroshima Bay might have led to the outbreaks of noxious dinoflagellates in recent years. 相似文献
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Distribution and abundance of resting cysts of the toxic Alexandrium spp. (Dinophyceae) in sediments of the western Seto Inland Sea, Japan 总被引：1，自引：0，他引：1
MINEO YAMAGUCHI SHIGERU ITAKURA KEIZO NAGASAKI YUICHI KOTANI 《Fisheries Science》2002,68(5):1012-1019
Sediment samples were collected from 135 stations in the western part of the Seto Inland Sea (Iyo Nada, Suo Nada, Beppu Bay, Tokuyama Bay, Hiroshima Bay, Aki Nada, Hiuchi Nada and Bingo Nada) to determine the horizontal distribution and abundance of resting cysts of Alexandrium spp. ( A. tamarense + A. catenella ). Enumeration of the cysts was performed using the primuline-staining direct count method. Cysts of Alexandrium spp. were rarely found in Iyo Nada, Suo Nada and Beppu Bay, but were widely distributed in Tokuyama Bay, Hiroshima Bay, Aki Nada, Hiuchi Nada and Bingo Nada. Cyst concentrations ranged from not detected (ND) to 14, ND to 17, ND to 4, 93 to 8137, 8 to 4454, ND to 6, ND to 18 and 4–29 cysts/cm3 wet sediment in Iyo Nada, Suo Nada, Beppu Bay, Tokuyama Bay, Hiroshima Bay, Aki Nada, Hiuchi Nada and Bingo Nada, respectively. The majority of cysts occurred in Tokuyama Bay and Hiroshima Bay, where higher densities were observed in the inner bay and along the coastal margin. Relatively higher cyst concentrations were observed at stations with a higher mud content. The abundance of Alexandrium spp. cysts in western Seto Inland Sea is lower than in the eastern Seto Inland Sea, except for Tokuyama Bay and Hiroshima Bay. However, because sporadic blooms of Alexandrium have been observed, continuing monitoring is necessary to prevent paralytic shellfish poisoning outbreaks in this area. 相似文献
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与多花黑麦草抗灰叶斑病相关基因紧密连锁的RGA-CAPS标记筛选 总被引：4，自引：0，他引：4
以多花黑麦草抗灰叶斑病品种Sach iaoba、感病品种M inam iaoba及其杂种F1分离群体为材料,采用接种鉴定和分群分析法(BSA)进行抗病基因类似物限制性内切酶酶切多态性(RGA-CAPS)筛选。得到与多花黑麦草抗灰叶斑病相关基因紧密连锁的RGA-CAPS标记,该标记与灰叶斑病抗性相关基因紧密连锁,连锁距离为4.94cM。测序和BLASTX查询结果显示,该RGA与水稻的1个NBS-LRR类抗性蛋白(Genbank/NCB I:AAT81729.1)同源性高达67%,序列分析结果显示,对应于抗、感病性的该RGA片段长度均为361 bp,两片段之间存在多个单核苷酸差异(SNPs)。利用SNPs重新设计引物,并应用新设计引物成功地将RGA-CAPS标记转换成共显性STS标记。 相似文献
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