共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
果用桑品种DL—1的育成 总被引:1,自引:0,他引:1
桑果以其独特的色泽口感和丰富的营养价值深受消费者喜爱.云南有丰富的桑属(Morus)植物种质资源,桑属植物19个种及变种中云南有12个种的分布.从1990至2000年,云南省蚕桑研究所利用野生的长果桑(M.laevigata Wall.)、广东桑(M.atropurpurea Roxb.)、白桑(M.alba Linn.)、滇桑(M.yunnanensis Koidz.)等资源进行杂交育种选育产果专用桑品种,于1998年在单株选择中选出果形整齐、口感好、成熟整齐、叶型小、果实产量高的单株DL-1号,经近年的观察遗传性状稳定,是一个值得在水果产业上推广的新品种.本文介绍DL-1号的选育经过、生物学特性及性状、品质初分析、产果量对比、丰产栽培技术、开发前景探讨. 相似文献
4.
5.
6.
果桑“大十”是果叶兼用的桑树品种,既可收获果实食用,又可收获桑叶养蚕。该品种产桑果果型大,无核,成熟后酸甜可口,营养丰富,并有极高的药用价值。现已作为第三代水果资源之一被开发利用,宜兴市部分农户也引进了果桑栽植,通过几年的栽培管理现已摸索到果桑“大十”的丰产丰收技术,供同仁作参考。 相似文献
7.
8.
以优质、高产、抗逆性强,果用性状好为引种育种目标,从引进品种中筛选出若干优良的叶果兼用桑品种,其中人工三倍体桑品种丰田16号的中试结果表明:与标准二倍体对照种荷叶白相比,全年单位桑园面积产叶量增加29.8%,桑叶养蚕的万头蚕茧层量提高6.5%,100kg桑产茧量提高8.1%;与三倍体叶果兼用桑品种大10相比,单位桑园面积产果量增加9.5%,产叶量提高24.7%,表现出三倍体桑叶片肥大,桑果大,生长旺盛,品质优,抗性强等优良特性,是一个叶果综合经济性状和抗逆性良好的高效桑品种。 相似文献
9.
10.
为了筛选适宜于新疆荒漠化治理种植的生态桑品种,对来自新疆野生资源中抗逆性较好的优良植株以及国内抗性较好的生态桑品种进行了水分、盐分胁迫试验。结果表明:10个新疆地方生态桑品种的抗旱、抗盐碱较好,相比国内其他生态桑品种其抗逆性差异达显著水平,说明这10个新疆地方品种可作为新疆抗逆性桑树种质资源材料进行利用。 相似文献
11.
12.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
13.
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
16.
17.
18.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
19.
乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献