甜椒始花期氮素分配动态的研究   总被引：2，自引：1，他引：2  

隋方功  王运华  姚源喜  乌尼木仁  稻永醇二 《园艺学报》2002,29(3):238-242

 利用¹⁵N 示踪技术研究了营养液培养甜椒始花期吸收的氮素在体内的动态分配规律。结果表明: 根与果实中氮的含量在始采期以后保持稳定; 而叶片中氮的含量则随生育进程迅速下降, 盛采期时与果实和根相近, 且两倍高于茎和侧枝。始花期由根吸收的标记氮主要贮存在叶片中, 2 周后向新生器官的运转率高达50. 6%, 4 周后达到57. 1%, 6 周后为58. 0%, 说明越是新近吸收的氮素越容易被再度运转到其它器官, 随着在体内时间的延长, 氮的再运转能力逐渐降低。开花后2 周收获的果实中标记氮占始花期吸收总量的3. 24%, 第3、4、6 周分别为11. 12%, 9. 49%和4. 75%。果实是甜椒体内氮的强力库, 氮素竞争力最强。  相似文献   

Production of inter-section hybrids between Primula filchnerae and P. sinensis through ovule culture     

Junji Amano  Juntaro Kato  Masaru Nakano  Masahiro Mii 《Scientia Horticulturae》2006

Inter-section hybrids were obtained in the reciprocal crosses between Primula filchnerae (2n = 2x = 24) of Sect. Pinnatae and P. sinensis ‘Fanfare’ (2n = 2x = 24) of Sect. Auganthus by rescuing ovules on half-strength (1/2) Murashige and Skoog's (MS) medium supplemented with 50 g l⁻¹ sucrose, 2.5 g l⁻¹ gellan gum, 0.1 mg l⁻¹ α-naphthaleneacetic acid (NAA), 0.1 mg l⁻¹ 6-benzyladenine (BA) and 50 mg l⁻¹ gibberellic acid (GA₃). In ovule culture, germination occurred with radicle elongation but no plumule was observed. The radicle kept on the initial medium showed root proliferation with callus formation. When the calluses were transferred to (1/2)MS media containing 30 g l⁻¹ sucrose and 3 g l⁻¹ gellan gum, without plant growth regulators (PGRs) or with 1 mg l⁻¹ zeatin and 0.1 mg l⁻¹ NAA, plantlets were regenerated. The plants thus obtained were confirmed to be hybrids through flow cytometry (FCM) and random amplified polymorphic DNA (RAPD) analyses. The hybrid obtained when P. filchnerae was used as the maternal parent was diploid, whereas hexaploid hybrid was obtained when using P. sinensis as the maternal parent. The hexaploid hybrid might be produced through chromosome doubling of a triploid originated from the fertilization of P. sinensis with unreduced pollen of P. filchnerae.  相似文献   

Anti-allergic effects of the brown alga <Emphasis Type="Italic">Eisenia arborea</Emphasis> on Brown Norway rats     

Yoshimasa Sugiura  Kohji Matsuda  Takashi Okamoto  Makoto Kakinuma  Hideomi Amano 《Fisheries Science》2008,74(1):180-186

To investigate the anti-allergic effects of the brown alga Eisenia arborea. A strain of Brown Norway rats know to strongly respond to immunoglobulin E (IgE) were used as an allergy model animal. The rats were immunized with ovalbumin by oral administration. The levels of serum IgE and histamine were suppressed in the rats fed a diet supplemented with dried E. arborea powder. As for the cytokine pattern, the interferon-γ production in the spleens and mesenteric lymph nodes (MLN) was enhanced, and the interleukin-4 (IL-4) production in the spleens and/or IL-10 production in the spleens and MLN were suppressed. These results, together with the change in the Th1/Th2 balance, indicate that the rats fed with E. arborea became more anti-allergic, suggesting that E. arborea might possess anti-allergic effects.  相似文献   

沼泽地改造实验的调查与研究     

田树华  闫顺吉 《吉林林业科技》1994,(1):7-11,17

调查研究结果表明，实验所采取的各项措施是可行有效的，沼泽地生境发生了明显变化，地下水平均下降０．６－１．０ｍ，地温５－２０ｃｍ处提高６－８℃，土壤的理化性质得到明显改善，水、气、热趋于协调。林木生长良好，６年生落叶松树高、胸径生长量分别为０．４６ｍ和０．５０ｃｍ，已达到速生丰产林标准。  相似文献   

Growing situation of afforested trees and damage to lower-story trees caused by felling in multi-storied forest management in Peninsular Malaysia     

Isao Sawaguchi  Shunji Shimizu  Kouichi Ichihara  Katsumi Toyokawa  Osamu Ohkawabata 《Journal of Forest Research》1997,2(1):15-19

The growing condition of afforestation trees and damage to lower-story trees caused by felling and hauling of upper-story trees in a multi-storied forest in Peninsular Malaysia was surveyed. Seventy months have passed since the planting ofAcacia mangium upperstory trees, which have grown 233 m³/ha in volume. The growth ofShorea leprosula thirty-five months after planting of lower-story trees have reached 5.54 m in height. However, as the ratio of height to basal diameter exceeds 100:1, trees are tapering to a considerable degree. A backhoe was installed in order to fell the upper-story trees. From the results of logging, the damage ratio estimation of the lower-story trees was simulated by using the Monte Carlo method. The damage ratio differed considerably depending on planting patterns, height of upper-story trees and felling skills. The results of this survey proved that the felling and hauling of upper-story trees would be technically feasible in the future, except when one row upper-story trees and one row lower-story trees method were employed.  相似文献   

Application of modal analysis by transfer function to nondestructive testing of wood II: modulus of elasticity evaluation of sections of differing quality in a wooden beam by the curvature of the flexural vibration wave   总被引：1，自引：0，他引：1  

X.?Yang  T.?Amano  Y.?IshimaruEmail author  I.?Iida 《Journal of Wood Science》2003,49(2):140-144

 The shape of the flexural vibration wave of wooden beams at the first mode was detected using the transfer function. The dynamic modulus of elasticity (MOE) of beam sections of differing quality was estimated from the ratio of the curvature of the wave shape in this section to that of a clear beam. The results were as follows: (1) If a section with a lower dynamic MOE was introduced into a clear wooden beam, the curvature of the wave shape in that section became higher. (2) The ratio of the MOE and the reciprocal of the curvature ratio were highly correlated. (3) The MOE of a defect could be estimated, and the position of the defect could be determined accurately by examining the curvature of the flexural vibration wave shapes. Received: March 22, 2002 / Accepted: May 15, 2002 Part of this report was presented at the 50th Annual Meeting of the Japan Wood Research Society, Kyoto, April 2000. This article is translated from the Japanese version, which was published in Mokuzai Gakkaishi 47(5), 2001 Correspondence to:Y. Ishimaru  相似文献   

Distribution of free L-cysteine and glutathione in seaweeds   总被引：1，自引：0，他引：1  

Makoto Kakinuma  Chan Sun Park  Hideomi Amano 《Fisheries Science》2001,67(1):194-196

  相似文献   

Inhibitory effects of seaweeds on histamine release from rat basophile leukemia cells (RBL-2H3)     

Yoshimasa Sugiura  Yoshirou Takeuchi  Makoto Kakinuma  Hideomi Amano 《Fisheries Science》2006,72(6):1286-1291

ABSTRACT:   The effects of 80% methanol extracts from frozen samples of 41 macroalgae and one sea grass collected in the Ise-Shima region of Japan were investigated on histamine release from rat basophile leukemia cells (RBL-2H3) sensitized with antidinitrophenyl (DNP) IgE and stimulated with DNP-BSA. Of the 21 brown algae, five green and 15 red algae, and one sea grass tested, only extracts from seven brown algae suppressed histamine release from RBL cells, as determined by high-performance liquid chromatography (HPLC) analysis. When the cytotoxic effects of the seven brown algal extracts were investigated by Trypan blue staining, only Eisenia arborea and Sargassum thunbergii did not show cytotoxic effects. Therefore, we conclude that E. arborea and S. thunbergii may contain compounds that have antiallergic effects without inducing cell death.  相似文献   

The maturation of the salmon GnRH system and its regulation by gonadal steroids in masu salmon     

M. Amano  K. Ikuta  S. Kitamura  K. Aida 《Fish physiology and biochemistry》1997,17(1-6):63-70

Pituitary gonadotropin (GTH) secreting cells and brain gonadotropin-releasing hormone (GnRH) secreting neurons are known to be subjected to feedback control by gonadal steroid in teleosts. In masu salmon, Oncorhynchus masou, salmon GnRH (sGnRH) neurons in the ventral telencephalon (VT) and the preoptic area (POA) are involved in the control of GTH cells because sGnRH synthesis in these areas is activated with gonadal maturation. In this study, we attempted to clarify mechanisms of feedback control of sGnRH neurons by gonadal steroids. We examined the effects of 17-methyltestosterone (MT) on sGnRH synthesis in yearling and 2-year-old female fish (which were immature during experimentation in May), and the effects of castration on sGnRH synthesis in underyearling precocious male fish in August. sGnRH synthesis in the POA, but not in the VT, was increased by MT administration in 2-year-old females only, indicating higher sensitivity to MT in the preoptic sGnRH neurons. Castration increased sGnRH synthesis in the VT but not in the POA. These results suggest that sGnRH neurons in the VT and those in the POA are differentially regulated by gonadal steroids.  相似文献   

Distribution of three GnRHs in the brain and pituitary of the wild Japanese flounder Paralichthys olivaceus   总被引：1，自引：1，他引：1  

Ky Xuan Pham  Masafumi Amano  Noriko Amiya  Yutaka Kurita  Kunio Yamamori 《Fisheries Science》2006,72(1):89-94

ABSTRACT:   Wild adult maturing and immature female Japanese flounder Paralichthys olivaceus were collected in June 2004 and January 2005, respectively, to clarify a possible role of gonadotropin-releasing hormones (GnRHs) in reproduction. Levels of salmon GnRH (sGnRH), chicken GnRH-II (cGnRH-II) and sea bream GnRH (sbGnRH) in the brain and pituitary were examined by time-resolved fluoroimmunoassay. Three forms of GnRHs were detected in the discrete brain at various levels. In the pituitary of both maturing and immature fish, sbGnRH was abundant together with a pronounced amount of sGnRH, whereas cGnRH-II was almost below the detectable limit. In maturing fish, levels of sbGnRH were high in the telencephalon, hypothalamus and pituitary, while levels of sbGnRH of immature fish were very low in these regions. These results indicate that sbGnRH is mainly responsible for gonadotropin secretion, and that sbGnRH in the anterior part of the brain is associated with gonadal maturation in the Japanese flounder.  相似文献