两个水稻DH群体发芽期和幼苗前期耐碱性状QTL定位比较

利用两个不同的加倍单倍体群体,在0.15%Na2CO3胁迫下,以发芽期和幼苗前期的发芽势（GE）等10个性状碱害相对值作为耐碱指标,进行耐碱性状QTL定位比较。碱害相对值相关分析表明,多个性状的碱害相对值存在显著或极显著相关。采用QTLMapper1.6统计软件对碱害相对值进行QTL分析。DH-1群体定位到10个主效QTL和15个上位性QTL,DH-2群体定位到14个主效QTL和15个上位性QTL。两群体定位列线比对发现：1个控制相对根长的QTL,qRRL3-1,两群体定位在第3染色体对应的区域（CT339-G62和RM7-RM3280）。其他性状两群体没有定位在相同的区域,但存在多个重要的数量基因座位,如CT158-CT550、RM3755-RM418和RM1349-RM1061等区域。在这些相同基因座位上两群体都检测到控制不同性状的主效QTL或上位性QTL,耐碱性QTL可能存在多效性、连锁性,在不同遗传背景下加性效应和上位性效应可以相互转化。多个QTL不仅与水稻耐碱性有关,还与多种抗逆性有关。这些结果将有利于耐碱性分子机制的剖析和强耐碱性水稻品种的选育。     

张家川县放牧补饲条件下的肉牛增重试验

经对12—18月龄西杂一代阉牛10头,采取以放牧为主、夜间补饲,育肥90d,试验表明试验组平均总增重86.4±44.4kg,平均日增重0.96±0.69kg,12月龄的6头日增重1kg,育肥效果显著。     

甜樱桃休眠期枝条SOD·POD酶活性变化研究

[目的]研究甜樱桃枝条休眠期内SOD、POD酶活性的变化规律,探讨其抗寒性。[方法]以4个甜樱桃品种1年生枝条为试材,测定不同时期的SOD、POD酶活性变化。[结果]试验表明,甜樱桃4个品种的SOD、POD酶活性随温度的降低而升高,随气温的回升而降低,1月份达到最高值。4个品种的SOD、POD酶活性均为龙冠较高,显著高于其他3个品种,表现出较强的抗寒性;龙宝、红蜜次之;龙丹的SOD、POD酶活性均低于其他3个品种,抗寒性较弱。[结论]甜樱桃4个品种的抗寒性大小排序为：龙冠〉龙宝〉红蜜〉龙丹。     

抗战时期贵州茶政及其影响研究

贵州省境温暖湿润,素号山国,历史上茶业经济发达.1840年后,由于列强入侵,社会动荡,茶树多被放置或采伐,导致茶叶产量顿减.民国时期抗战军兴,茶叶成了政府维护国家安全和换取外汇的重要输出产品,在此前提下,民国政府积极要求发展茶叶.贵州省府采取了促进茶树栽培、改良制茶法,开办茶叶讲习所,以及与高校院所及研究机构合作等积极...     

不同饲养水平对瑶山鸡生产性能和胴体品质的影响

文章旨在研究不同饲养水平对瑶山鸡生产性能和胴体特征的影响.试验将400只平均体重一致的1日龄瑶山鸡随机分为2组,每组4个重复,每个重复50只.2组分别饲喂代谢能水平为3155 Kcal/kg、粗蛋白质水平为225 g/kg的高能高蛋白日粮和代谢能水平为2965 Kcal/kg、粗蛋白质水平为195 g/kg的低能低蛋白...     

First feeding of diploid and triploid yellowtail tetra Astyanax altiparanae: An initial stage for application in laboratory studies

In this study, the aim was to establish a protocol for first feeding of diploid and triploid yellowtail tetra Astyanax altiparanae in laboratory conditions. The fry were fed with five different diets: (i) Artemia franciscana nauplii, (ii) plankton, (iii) dry food, (iv) Artemia franciscana nauplii + plankton, and (v) Artemia nauplii + plankton + dry food. Additionally, the growth and survival rates of diploid and triploid individuals were also evaluated. On day 10, the length of the fish between the treatments differed significantly (p = .0001) and ranged from 4.07 ± 0.06 mm (dry food) to 8.50 ± 0.64 mm (plankton + Artemia). The sizes of the fish increased with time, except for the fish fed with dry food. The survival rates were similar for the fish fed with the four diets and ranged from 80.7 ± 5.4% (dry food + plankton + Artemia to 92.0 ± 1.6% (plankton + Artemia), but differed from the fish fed with dry food (17.7 ± 5.8%, p = .0017). Diploids and triploids did not present differences on day 0 (p = .2252) and on day 10 (p = .4844) when the fish presented 6.77 ± 0.25 mm and 6.54 ± 0.15 mm respectively. Survival of diploids (87.3 ± 5.13%) and triploids (74.67 ± 2.30%) were also similar (p = .0285). These data are innovative and useful for establishing protocols for this species in both academic and applied sciences.     

中南地区甜玉米丰产栽培技术

本文从土地选择、品种选择、怖种与育苗、田间管理、病虫害防治、适时收获等六个方面,总结了中南地区甜玉米的丰产栽培技术.     

高粱生育期遗传模型测验

采用增广ＮＣⅡ设计，对高粱生育期遗传模型进行了测验。结果表明，高粱生育期的遗传不符合加性──显性模型，基因的显性效应不明显．但上位性效应却比较明显；控制生育期的增效、减效等位基因在不育系和恢复系的分配比率，有极显著差异；生育期的遗传．增效等位基因即晚熟基因为显性．且这种显性为超显性。     

Rearing of pike-perch larvae using formulated diets – first success with starter feeds

The present study evaluated the performance of two commercial diets: AgloNorse (AN) and BioKyowa (BK), and two experimental, formulated diets based on casein (C) or casein plus casein hydrolysates (CH) in rearing of pike‐perch larvae (Sander lucioperca L.). All fish were 5 day old and control group was fed live Artemia nauplii. Fish were sampled periodically for histological comparison of morphological changes in the digestive tracts. Survival of fish fed Artemia nauplii, BK and AN was similar: 54.4%, 50.8% and 52.4%, respectively, while the fish fed formulated diets C and CH showed considerably lower survival: 28.4% and 21.6% respectively. After 5 weeks of rearing, the average body mass of fish ranged from 212±32 mg in Artemia fed group to 53.8±6.8 mg in C diet fed group. A considerable vacuolization of supranuclear zone in enterocytes of posterior intestine was observed in the larvae fed commercial diets. No anomalies in liver development were found. Hepatocytes of fish fed BK diet showed larger glycogen storage areas, compared with those occupied by lipids. The highest zymogen accumulation of pancreatic cytoplasm was observed in fish fed Artemia. In fish fed C and CH diets, anomalies in digestive system development were indicated by lower and less numerous intestinal folds, smaller hepatocytes, retarded development of gastric glands, and in CH group – also local fatty degeneration of liver.