Development and Identification of Introgression Lines from Cross of Oryza sativa and Oryza minuta

Introgression line population is effectively used in mapping quantitative trait loci(QTLs),identifying favorable genes,discovering hidden genetic variation,evaluating the action or interaction of QTLs in multiple conditions and providing the favorable experimental materials for plant breeding and genetic research.In this study,an advanced backcross and consecutive selfing strategy was used to develop introgression lines(ILs),which derived from an accession of Oryza minuta(accession No.101133) with BBCC genome,as the donor,and an elite indica cultivar IR24(O.sativa),as the recipient.Introgression segments from O.minuta were screened using 164 polymorphic simple sequence repeat(SSR) markers in the genome of each IL.Introgressed segments carried by 131 ILs covered the whole O.sativa genome.The average number of homozygous O.minuta segments per introgression line was about 9.99.The average length of introgressed segments was approximate 14.78 cM,and about 79.64% of these segments had sizes less than 20 cM.In the genome of each introgression line,the O.minuta chromosomal segments harbored chromosomal fragments of O.sativa ranging from 1.15% to 27.6%,with an overall average of 8.57%.At each locus,the ratio of substitution of O.minuta alleles had a range of 1.5% 25.2%,with an average of 8.3%.Based on the evaluation of the phenotype of these ILs,a wide range of alterations in morphological and yield-related traits were found.After inoculation,ILs 41,11 and 7 showed high resistance to bacterial blight,brown planthopper and whitebacked planthopper,respectively.These O.minuta-O.sativa ILs will serve as genetic materials for identifying and using favorable genes from O.minuta.     

一种恢复渠道中线测量的快捷方法

渠道是农田水利建设的一个重要工程，渠道测量在渠道兴、改、扩建中具有重要的地位和作用。仅就施工过程中如何快捷恢复渠道中线的测量方法作了探讨，并对恢复中线的精度作了相应分析。     

胡萝卜新品种杂交一代红参的选育

红参胡萝卜是用完全瓣化型雄性不育系培育的杂交一代新品种.该品种肉质根长圆柱形,韧皮部和木质部均为橙红色,个体整齐度高,春播平均单根质量200.5 g,产量450 002kg/hm2;秋播平均单根质量290.5 g,产量64 500 kg/hm2.β胡萝卜素含量110.0 mg/kg,商品率高,叶幅小,成形早,抗抽薹,适合春、秋种植.     

丝瓜自交系主要经济性状配合力及遗传参数分析

按双列杂交设计,用Griffing分析方法,对6个丝瓜自交系的10个主要经济性状的配合力及遗传参数进行分析.结果表明:各性状的一般配合力方差和特殊配合力方差均达到极显著水平.P3和P6自交系的综合性状较优,可在育种中直接利用;P3×P4等4个组合具有较强的杂种优势,有一定的增产潜力.在育种工作中,对丝瓜第1雌花节位等3个性状宜早代选择,而对可溶性糖含量等其它性状应进行晚代选择.     

苹果可溶性固形物含量的检测方法——基于可见光近红外光谱技术

为了快速检测苹果的可溶性固形物(SSC)含量,采用可见光近红外光谱技术,结合主成分分析(PCA)和BP神经网络技术,来建立苹果SSC的预测模型.获取苹果样本在345～1039 nm波段的漫反射光谱,采用DPS数据处理系统对其进行主成分分析,并提取出累计可信度大于95 %的5个新主成分.建立一个3层的BP神经网络模型,并将这5个新的主成分作为BP神经网络模型的输入量,其结果是98 %以上预测样本的预测相对误差在5 %以下.该研究表明,采用近红外光谱技术来建立苹果可溶性固形物的预测模型是可行的.     

降低农村电网线损的措施

从改善电力网络功率分布、合理安排经济运行方式、加强农村电网改造等角度,论述了降低技术线损的措施;从制定线损指标计划、加强计量管理和抄收管理、建立管理线损考核制度和约束机制等方面入手,提出降低管理线损的具体措施。     

水稻光温敏两系不育系15S特征特性及繁殖技术

介绍了水稻光温敏两系不育系15S的形态特征和生育特性,提出了繁殖地点选择,生育期安排,培育壮秧,落地谷的处理等繁殖高产优质不育系种子的技术措施.     

高速公路的建设对沿线经济发展影响的研究——以赣粤高速公路江西段为例

以赣粤高速公路建设对江西省经济发展影响为例,阐明了高速公路对沿线经济发展的深刻影响.分析了高速公路建设对江西省区位优势改变、产业结构和产业布局的影响,从而提出了构建沿线经济带的设想.