基于ITS模型的短波宽带移动信道建模与仿真

短波宽带移动信道模型是远程机动平台移动通信系统性能分析评估的基础,现有短波宽带信道模型不能有效表征机动平台移动信道快时变多普勒效应,难以适应机动平台短波移动通信需要。鉴于此,在分析机动平台行为模式与信道时变多普勒效应的映射关系基础上,推导出了机动平台移动信道冲激响应表达式,基于ITS(international telecommunication society)模型提出了一种适用于固定与机动不同场景、不同传播模式、宽窄带融合的短波通信信道模型。利用信道冲激响应与信道散射函数从时域色散、频域色散两个维度对本文信道模型的有效性进行了验证。结果表明,该信道模型能够基于机动平台运动轨迹实现时变多普勒效应传播复现与信道模拟;也能在运动轨迹未知情况下,基于飞行器种类、机动频率等先验信息,实现具有各态历经性的机动平台短波宽带信道仿真,对机动平台短波移动通信系统效能评估有重要意义。

粒度及粒重对“云谷1号”黑米总花色苷含量的影响

【目的】研究粒度及粒重对"云谷1号"黑米总花色苷含量的影响。【方法】利用萃取法提取黑米花色苷,用pH示差法测定溶液吸光度值,用统计学方法进行分析。【结果】云谷1号总花色苷的含量与粒度和粒重极显著正相关(P<0.001)。粒厚、粒重和粒宽是影响总花色苷含量的重要因素,粒厚超过1.80 mm后,总花色苷含量的差异不显著,厚度1.70~1.80 mm的籽粒处于中间过渡态。利用偏最小二乘分析提取一个新的综合变量,分别解释了96.3%的自变量变异和78.8%的因变量变异,预测率为77.1%。【结论】粒度和粒重不仅影响稻米的外观品质和物理特性,而且还与某些营养成分的含量密切相关。

Evaluation of the Pathotypes of Xanthomonas oryzae pv. oryzae and Preliminary Analysis of the Resistant Reactions of Main Japonica Rice in the Yunnan Plateau, China

The pathogenicity of 36 isolates of Xanthomonas oryzae pv. oryzae （Xoo）, which were collected from japonica rice varieties in the Yunnan Plateau, China, was evaluated. It was evaluated on 29 rice varieties including a set of seven varieties to identify pathogenicity, i.e., Haonuoyang, TN1, Kogyoku, Zhenzhu＇ai, IR26, Nanjing 33, and Kinmaze, which may be considered as a set of differential varieties for Xoo races from Yunnan japonica rice. The efficiency of the seven varieties was further confirmed. The results showed reversible and specific interactions between isolates and varieties. The isolates were classified into nine pathotypes from pathotyp Ⅰ to Ⅸ according to their pathogenic reactions on the seven rice varieties. The pathotype V was the epidemic, whereas pathogen Ⅶ was the most pathogenic. Most japonica varieties grown in the Yunnan Plateau were susceptible to Xoo. The rice lines IRBB21 （Xa-21）, Zhachanglong （Xa-22,, Xa- 24,）, and IR1545-339 （xa-5）, which were resistant to all the isolates tested, can be used as donors of resistant genes for bacterial blight in japonica rice breeding in the Yunnan Plateau.

QTL Analysis of Some Agronomic Traits in Rice Under Different Growing Environments

The culm length, panicle length, spikelets per panicle and panicle exsertion were evaluated by using F2：3 population including 200 lines derived from the cross of indica and japonica Milyang 23/Jileng 1 under five different environments of Beijing （natural normal growing environment）, Kunming （natural cold environment）, Gongzhuling of China （cold water irrigation） and Chuncheon of Korea （natural normal growing environment and cold water irrigation）, and QTLs of these traits were analyzed by using SSR markers. The results showed that 44 QTLs related to these agronomic traits were detected under five different growing environments, and these QTLs have been located on 11 chromosomes except chromosome 9. The QTLs for qCLla, qCL1b, qCL5a, qCL6b, qPLla, qPL3a, qPL6b, qPL6c, qPL7b, qSP8b, qSPlc, qSP11a, qSP12, and qPE1 have been detected under more than two growing environments, and those that were little affected by environments, were stable QTLs. Among them, qCLla, qCLlb, qPLla, qSPlc, and qPE1 explained 24.2-55.2%, 22.7-39.9%, 12.5-27.7%, 14.4-33.5%, and 26.6-28.7% of observed phynotypic variation, respectively, which were major genes mainly appearing as overdominance. These QTLs cause the increase in action to culm length, panicle length, spikelets per panicle, and panicle exsertion under cold environment, showing that these QTLs were correlated with cold tolerance.

基于高密度SNP标记的云南元阳红米种质资源遗传多样性分析

为了明确云南元阳红米地方品种种质资源的遗传背景及遗传多样性,给当地红米种质资源保护与开发利用提供理论依据,对元阳梯田地区的红米种质资源进行了全面收集,并利用分布于水稻12条染色体53032个SNP标记的水稻50K液相基因芯片对155份红米材料进行全基因组基因型检测,通过群体结构和聚类分析,评价红米种质资源的遗传背景和多样性。通过计算最小等位基因频率(MAF)、核苷酸多态性(pi)、多态性信息含量(PIC)等多个多态性指标,发现元阳红米品种间的位点遗传多样性较低。通过群体结构分析,可将供试材料分为9大类,9个类群之间基因交流不频繁,类群内遗传背景单一,少部分材料具有混合的遗传背景。NJ聚类分析可将供试材料分为明显的籼、粳2大类,其中籼稻类涵盖的材料有140份,占供试材料总数的90%。本研究利用高密度SNP基因型数据揭示了云南元阳地方红米品种的遗传多样性水平较低、种质资源遗传背景单一等特点,通过精准鉴定去除了品种重复,为当地红米种质资源的保护与利用提供理论依据。