QUALITATIVE AND QUANTITATIVE THYROID IMAGING IN FELINE HYPERTHYROIDISM USING TECHNETIUM-99M AS PERTECHNETATE

Thyroid imaging using technetium-99m as pertechnetate (^99mTcO₄) was carried out in five healthy, euthyroid and 37 hyperthyroid cats using both pinhole and parallel-hole collimators. Images of greater resolution, necessary to distinguish bilateral lobe involvement, were obtained using the pinhole collimator. Per cent thyriod ^99mTcO₄ - uptake was calculated in each cat and was significanly (P < 0.001) higher in hyperthyroid compared with euthyroid cats. In the hyperthyroid cats, per cent thyroid uptake was significantly correlated with serum total thyroxine (T4) and triiodothyronine (T3) Concentrations. Per cent thyroid ^99mTcO₄ - uptake is increased in feline hyperthyrodism and may be calculated using a pinhole collimator alone at the time of qalitative assessment of the extent of thyroid tissue involvement.     

Die Ontogenese von Zea mays L. und ihre Beeinflußbarkeit durch Wachstumsregulatoren

The ontogenesis of Zea mays L. and their modification by plant growth regulators
During a period of 2 years with the maize variety Santos , the effects of the plant growth regulators CCC and RSW 0411 upon vegetative and generative development were tested by pot experiments. The experiments were carried out to optimize the PGR application to maize and to interpret possible PGR effects. The application shah improve the resistance to lodging by a reduction of ear–and plant height as well as by an increase of stalk diameter. At the same time, the sink-capacity of the ear shah increase because this is lucrative to all specializations of corn production.
The PGR RSW strongly reduced the stem elongation during the growing season after an application in ES 21. The basal stem diameter increased highly significant. The PGR CCC did not obviously effect the vegetative development of maize.
RSW suppressed the branching of the tassel after an application in ES 21. Later applications did not disturb the tassel development, because the tassel were completely differentiated at the application time in ES 31/32 and ES 34/35. High application rates of CCC, applied in ES 31/32 and ES 34/35, increased significantly the grain yield by a higher number of kernels per ear. The 1000 kernels weight remained unchanged. The results of the ear ontogenesis indicated, that the PGR CCC lessened the reduction of female spikelets in the ear during the post-silking period.     

重庆市粮食作物单产预测

本文分析了几种常用粮食作物单产预测方法的利弊,选用成长曲线作为重庆市粮食作物单产预测模型,并利用历史资料,建立了各粮食作物单产水平预测公式,对各粮食作物在1990年、1995年、2000年的单产水平给出了定量的估计。     

水稻边际优势利用栽培增产的生态原因研究

对大小垄栽培群体和30cm等行距栽培群体不同层次的光照强度、群体行间温、湿度等生态因子及每穴穗数、每穗实粒数和单穴生产力三个产量性状和不同分蘖时期每穴茎数的边际效应指数进行了研究。结果表明,大小垄栽培群体下部的光照强度和透光率显著增加,行间温、湿度降低,使群体内部的光、温条件得到改善。每穴穗数、每穗实粒数和单穴生产力及不同分蘖时期每穴茎数的边际效应指数降低,说明实行大小垄种植后,群体内部的长势与边行的差距缩小,群体内部个体的生长优势得到发挥,达到了利用边际优势增产的目的。     

不同种植密度对遵义地区玉米主推品种产量及相关性状的影响

运用裂区设计,研究不同密度对遵义地区玉米主推品种的产量及其相关性状的影响。结果表明:适当提高玉米生产上推广的密度,有利于产量的提高;而且密度对穗粗、穗长、秃尖的影响较为明显,在较高密度下穗粗、穗长明显低于低密度的处理,而高密度的处理秃尖明显大于低密度的处理。综合考虑:适当地增加密度是提高遵义地区玉米产量的有效途径。     

萝卜淀粉酶活性的配合力分析及遗传参数的估计

以大青皮萝卜(P1)、青萝卜(P2)、灯笼红(P3)、满堂红(P4)和浙大长(P5)为杂交亲本,按5×5完全双列交配设计,对萝卜淀粉酶活性进行了配合力分析和遗传参数的估算。结果表明:亲本P3和P5的淀粉酶总活性一般配合力较高,分别为9.243和0.829,为优良亲本可直接利用;杂交组合P2×P4、P5×P3、P1×P2和P4×P5的总酶活性特殊配合力较高,分别为11.983,7.250,3.983和1.343,有增加淀粉酶活性的潜力。α-淀粉酶活性、β-淀粉酶活性和总酶活性狭义遗传力分别为23.85%、44.27%和38.47%,β-淀粉酶活性和总酶活性遗传力较高,可在早代开始选择;而α-淀粉酶活性遗传力较低,受周围环境影响大,可于晚期世代选择。     

Characterization of near-isogenic lines carrying QTL for high spikelet number with the genetic background of an indica rice variety IR64 (Oryza sativa L.)

Total spikelet number per panicle (TSN) is one of the most important traits associated with rice yield potential. This trait was assessed in a set of 334 chromosomal segment introgression lines (ILs: BC₃-derived lines), developed from new plant type (NPT) varieties as donor parents and having the genetic background of an indica-type rice variety IR64. Among the 334 ILs, five lines which had different donor parents and showed significantly higher TSN than IR64 were used for genetic analysis. Quantitative trait locus (QTL) analysis was conducted using F₂ populations derived from crosses between IR64 and these ILs. As a result, a QTL for high TSN (one from each NPT donor variety) was detected on common region of the long arm of chromosome 4. The effect of the QTL was confirmed by an increase in TSN of five near-isogenic lines (NILs) developed in the present study. The variation in TSN was found among these NILs, attributing to the panicle architecture in the numbers of primary, secondary and tertiary branches. The NILs for TSN and the SSR markers linked to the TSN QTLs are expected to be useful materials for research and breeding to enhance the yield potential of rice varieties.     

广西油茶不同种源蒴果质量和种粒数变异

研究分析了广西18个油茶种源的蒴果质量和种粒数的变异及其相关性,结果表明:蒴果质量和种粒数在不同种源间分别存在极显著差异和显著差异,其变异系数分别为25.41%和33.13%;种源间的表型分化系数分别为28.63%和12.38%,蒴果质量和果粒数呈极显著的正相关,最后根据蒴果质量和种粒数的信息将18个种源通过聚类分析分为3类。     

Detection and verification of QTLs associated with heat-induced quality decline of rice (Oryza sativa L.) using recombinant inbred lines and near-isogenic lines

Decline in the apparent quality of rice (Oryza sativa L.) grain due to high temperatures during ripening recently became a major concern in many areas in Japan. The occurrence of white-back kernels (WBK) is one of the main problems of heat-induced quality decline. We identified QTLs associated with the occurrence of WBK using recombinant inbred lines (RILs) and verified their effects using near-isogenic lines (NILs). The QTL analysis used F₇ and F₈ RILs derived from ‘Hana-echizen’ (HE), which is tolerant to high temperature, × ‘Niigata-wase’ (NW), which is sensitive to high temperature. Four QTLs were identified on chromosomes 3, 4, 6, and 9 (qWB3, qWB4, qWB6 and qWB9). To verify the effects of qWB6 and qWB9, we developed two NILs in which qWB6 or both were introduced from HE into the NW background. The HE allele at qWB6 significantly decreased WBK under multiple environments. The combination of qWB6 and qWB9 in an F₂ population derived from a cross between a NIL and NW showed that the NW allele at qWB9 significantly decreased WBK if the qWB6 allele was HE. These results will be of value in marker-assisted selection for the breeding of rice with tolerance to heat-induced quality decline.     

山西省粮食单产波动与气象灾害的相关分析

根据山西省60多年来的粮食产量统计资料,对山西省粮食单产及主要粮食品种单产的波动性进行了分析,并进一步分析了粮食单产波动与气象灾害的相关性。结果表明,山西省粮食单产波动频繁;在主要粮食品种中,大豆单产波动最大,玉米单产波动最小。进一步的相关分析显示,自然灾害,尤其是旱灾,是山西省粮食单产波动的主要影响因素;在主要粮食品种中旱灾对玉米单产波动的影响最大;旱灾对粮食单产波动的影响有加大的趋势。