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141.
Kenji Asano Etsuo Shimosaka Yoko Yamashita Takashi Narabu Satoshi Aiba Itaru Sakata Kotaro Akai Satoshi Okamoto Seiji Tamiya 《Breeding Science》2021,71(3):354
Occurrence of pale potato cyst nematode, Globodera pallida (Stone) Behrens, was first recorded in Japan in 2015. Among several control measures, cultivation of resistant potato (Solanum tuberosum L.) varieties is the most effective in cost and environmental impact. As no G. pallida-resistant varieties have yet been developed in Japan, great emphasis is being placed on screening of germplasm possessing the resistance and development of the resistant varieties. In this study, we first improved previously reported DNA markers linked to the G. pallida resistance loci (GpaIVsadg and Gpa5) and then used these to screen more than 1,000 germplasms to select several candidate germplasms with resistance. We performed inoculation testing on the selected candidates and identified several resistant germplasms to the Japanese G. pallida population. Furthermore, we developed a simultaneous detection method combining three DNA markers linked to G. pallida and Globodera rostochiensis (Wollenweber) Behrens resistance loci. We validated the ability of C237-I marker to select resistant allele of GpaIVsadg and predict the presence of resistance in a Japanese breeding population. Resistant germplasms identified in this study could potentially be used to develop G. pallida-resistant varieties. The marker evaluation methods developed in this study will contribute to the efficient development of resistant varieties. 相似文献
142.
Mitsuhiro Nakaya Taizo Morioka Kyouhei Fukunaga Naoto Murakami Takashi Ichikawa Sachio Sekiya Satoshi Suyama 《Fisheries Science》2010,76(1):45-53
This study details the growth and maturation processes of Pacific saury Cololabis saira from eggs to first spawning under laboratory conditions. They were reared at 20°C, and fed almost to satiation every day. There was no significant difference in the knob length (KnL) between males and females, and so data for both sexes were combined in the following Gompertz growth formula: KnL t = 277.1 exp[?exp(?0.015 (t ? 83.8))]. The first spawning was observed 243 days after hatching (DAH). At the beginning of spawning, when the mean KnL was about 250 mm, only several hundred eggs were spawned at most. The spawning continued, and the number of spawned eggs increased notably after 260 DAH. Correlation and stepwise multiple regression analysis of the gonad somatic index (GSI) of Pacific saury versus KnL, CF, and DAH revealed that only DAH (R = 0.88 and 0.72 for males and females, respectively) was significantly correlated with GSI of Pacific saury (P < 0.001). This result suggests that DAH is one of the most influential factors for maturation in this species. 相似文献
143.
Satoshi Hashimoto Kenichi Ueno Kenichi Takahashi Toshiyuki Suzuki Yutaka Itabashi 《Fisheries Science》2010,76(3):529-536
Photosensitivity was observed in the mice used in bioassays of diarrhetic shellfish poisoning. The mice were intraperitoneally
injected with the extracts from the midgut glands of cultured scallops Patinopecten yessoensis gathered in early spring in Funka Bay, Hokkaido, Japan. The injections induced atypical symptoms in the mice within 24 h.
The symptoms included piloerection, substantial eye discharge, swelling of the ears and head, and ear scratching. They were
similar to those reported in studies of photosensitivity caused by pyropheophorbide in the midgut glands of abalones, which
are herbivorous gastropods. The problematic scallops also accumulated a large amount of pyropheophorbide-a. The amount determined with high-performance liquid chromatography was 300–530 μg per 1 g of the homogenate of the midgut
glands. The dose of pyropheophorbide sufficient to cause photosensitivity in a mouse is estimated to be 0.99–2.3 mg per mouse
with 20-g body weight. Moreover, comparative tests in mice showed that the onset of the symptoms required light and a substantial
amount of pyropheophorbide. Therefore, we determined that the observed symptoms were photosensitivity caused by pyropheophorbide.
Scallops, which are suspension-feeding bivalves, can accumulate a large amount of pyropheophorbide in the midgut glands depending
on the habitat environment. 相似文献
144.
Toshihiro Onitsuka Tomohiko Kawamura Shunsuke Iwanaga Satoshi Ohashi Toyomitsu Horii 《Fisheries Science》2010,76(4):619-623
The dietary value of juvenile stages (gametophyte and juvenile sporophyte) of the brown macroalga Eisenia bicyclis for post-larval and juvenile abalone Haliotis diversicolor of 2.0–6.5 mm in shell length (SL) was examined and compared with that of a benthic diatom, Nitzschia sp., in laboratory experiments. Most abalone actively fed on these diets, but there were large variations in the growth rate
among the diets and among the growth stages of abalone. Growth rates of abalone fed on Nitzschia sp. were highly variable within each growth stage, but showed no clear differences among growth stages. In contrast, in abalone
fed gametophytes or juvenile sporophytes, growth rates linearly increased as abalone grew. Growth rates of >60 μm SL/day were
observed in juveniles of >3 mm SL fed gametophytes, and juveniles of >5 mm SL fed juvenile sporophytes. These results indicate
that the dietary value of the juvenile stages of E. bicyclis for the abalone changes as they grow, and with growth juvenile abalone begin to efficiently utilize gametophytes and juvenile
sporophytes in that order. 相似文献
145.
Vongvichith Bounsong Morioka Shinsuke Sugita Tsuyoshi Phousavanh Nokjalia Phetsanghanh Norkeo Chanthasone Phonaphet Pommachan Phoutsamone Nakamura Satoshi 《Fisheries Science》2020,86(1):145-151
Fisheries Science - The growth of the climbing perch Anabas testudineus reared on lower protein feeds with the replacement of fishmeal (FM) by prepupae of the black soldier fly (BSF) Hermetia... 相似文献
146.
Ryo TAKEUCHI Satoshi TAKAGI Kenji HOSOYA Hiroshi OHTA Takaharu ITAMI Masahiro OKUMURA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(11):1740
Canine gastroesophageal intussusception (GEI) is a rare and life-threatening condition that requires prompt diagnosis and treatment. A 19-day-old Siberian Husky with a 4-day history of regurgitation was diagnosed with GEI based on the findings of computed tomography (CT) performed without anesthesia. Endoscopic reduction of intussusception was impossible; thus, surgical reduction by traction of the duodenum was performed. CT revealed improvement of megaesophagus 82 days postoperatively. Eleven months postoperatively, fluoroscopy showed recovery to nearly normal esophageal motility. Two years postoperatively, no clinical signs were reported. CT is useful to diagnose GEI in neonate puppies with poor abdominal fat and to assess the gastric edema and the anatomical association of stomach with other organs. Fluoroscopy is helpful for evaluating postoperative esophageal motility. 相似文献
147.
Suitable culture conditions for Rhodomonas sp. Hf-1 strain were examined for high productivity. Hf-1 strain was grown in an incubator for 7 days. The factorial experimental design investigated the following 19 variables: temperature (12, 16, 20, 24 and 28 °C), salinity (7, 14, 21, 28 and 35 psu), light intensity (20, 35, 50, 65 and 80 μmol m?2 s?1), light color (white, red, green and blue lights), and 3 factorial designs of photoperiod (24L:0D, 16L:8D and 12L:12D light:dark cycle). The cell density and specific growth rates (SGR) were analyzed. The best cell growth was observed under the following culture conditions: temperature of 24 °C, salinity of 21 psu, light intensity of 80 μmol m?2 s?1, and white light. In the photoperiod test, the highest cell density of 4.7?×?106 cells ml?1 was obtained at 24L:0D light:dark cycle, and the SGR was 0.57 μ day?1 at this time. We found that the Hf-1 strain was able to be cultured in extremely wide culture conditions. These results are expected to serve as a baseline study for culturing the Hf-1 strain in the laboratory and for its use in aquaculture. 相似文献
148.
Akira Miyazaki Akiko Ikeda Junichi Yonemaru Satoshi Morita Yoshinori Yamamoto 《Plant Production Science》2018,21(3):225-232
The occurrence of chalky kernels in rice is causally related to kernel size and endosperm morphology. This study aimed to investigate the occurrence of chalky kernels by analyzing kernel size, and the number and area of endosperm cells. Spikelets were sampled from upper and middle primary branches and lower secondary branches in a panicle, and divided into four categories: upper, middle, and lower perfect (PF) kernels and lower milky-white (MW) kernels. On the lower secondary branches, there was a higher percentage of chalky kernels, with smaller kernel lengths, widths and thicknesses, than the kernels on the upper and middle primary branches. MW kernels were smaller in size than PF kernels even on the same lower secondary branches. Regardless of grain appearance quality traits, the total areas of endosperm cross sections in lower kernels were significantly smaller than in upper kernels owing to the decreased cell area, and there was a significant negative correlation between the number of cells and average cell area. When the numbers and the areas of cells were analyzed using angular 30° intervals from the line connecting the center point and the dorsal vascular bundle, the MW kernels had significantly less cells than PF kernels near the ventral side at 120–180°. Thus, the decrease in the number of cells near the ventral side was a main causal factor in the decrease in MW kernel widths compared with PF kernel widths, and this suggested that cell division in MW kernels was inhibited at the early grain-filling stage. 相似文献
149.
150.
Miyuki Nakajima Shuirong Tang Yasuaki Hori Eiko Yaginuma Satoshi Hattori 《Soil Science and Plant Nutrition》2016,62(1):90-98
Submerged rice paddies are a major source of methane (CH4) which is the second most important greenhouse gas after carbon dioxide (CO2). Accelerating rice straw decomposition during the off-rice season could help to reduce CH4 emission from rice paddies during the single rice-growth season in cold temperate regions. For understanding how both temperature and moisture can affect the rate of rice straw decomposition during the off-rice season in the cold temperate region of Tohoku district, Japan, a modeling incubation experiment was carried out in the laboratory. Bulk soil and soil mixed with 2% of δ13C-labeled rice straw with a full factorial combination of four temperature levels (?5 to 5, 5, 15, 25°C) and two moisture levels (60% and 100% WFPS) were incubated for 24 weeks. The daily change from ?5 to 5°C was used to model the freezing–thawing cycles occurring during the winter season. The rates of rice straw decomposition were calculated by (i) CO2 production; (ii) change in the soil organic carbon (SOC) content; and (iii) change in the δ13C value of SOC. The results indicated that both temperature and moisture affected the rate of rice straw decomposition during the 24-week aerobic incubation period. Rates of rice straw decomposition increased not only with high temperature, but also with high moisture conditions. The rates of rice straw decomposition were more accurately calculated by CO2 production compared to those calculated by the change in the SOC content, or in its δ13C value. Under high moisture at 100% WFPS condition, the rates of rice straw decomposition were 14.0, 22.2, 33.5 and 46.2% at ?5 to 5, 5, 15 and 25°C temperature treatments, respectively. While under low moisture at 60% WFPS condition, these rates were 12.7, 18.3, 31.2 and 38.4%, respectively. The Q10 of rice straw decomposition was higher between ?5 to 5 and 5°C than that between 5 and 15°C and that between 15 and 25°C. Daily freezing–thawing cycles (from ?5 to 5°C) did not stimulate rice straw decomposition compared with low temperature at 5°C. This study implies that to reduce CH4 emission from rice paddies during the single rice-growth season in the cold temperate regions, enhancing rice straw decomposition during the high temperature period is very important. 相似文献