Relation of Root Growth of Rice Seedling with Nutrition and Water Use Efficiency Under Different Wat

来源 :Rice Science | 被引量 : 0次 | 上传用户:zhuobin0904
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Water deficiency is one of the primary yield-limiting factors in rice. In plants, the nutrition and water use efficiency depend on root growth efficiency under different water supply conditions (WSC). Three rice genotypes, Azucena (an upland japonica), IR1552 (a lowland indica) and Jia 9522 (a lowland japonica), were grown under different WSC with 0 cm (submerged), 40 cm and 80 cm groundwater levels below the soil surface to investigate the root parameters, water use efficiency, nitrogen, phosphorous and potassium contents, net photosynthetic rate and transpiration rate of the rice plant. The relative parameters were defined as the ratio of the parameters under submerged conditions (0 cm groundwater level below soil surface) to these under upland conditions (40 cm and 80 cm groundwater levels below soil surface). The results indicated that different genotypes showed different relative root parameters and relative nutrition content and water use efficiency under different WSC. The length and number of adventitious root are more important than seminal root length in water and nutrition uptake, and maintaining the grain yield and increasing dry matter, but the adventitious root number could not be served as an index for screening drought-resistant genotypes. Furthermore, different drought-resistant genotypes have been also found, and Azucena was resistant to drought, IR1552 sensitive to drought and Jia 9522 neither sensitive nor resistant to drought. Water deficiency is one of the primary yield-limiting factors in rice. In plants, the nutrition and water use efficiency depend on root growth efficiency under different water supply conditions (WSC). Three rice genotypes, Azucena (an upland japonica), IR1552 ( a lowland indica) and Jia 9522 (a lowland japonica), were grown under different soil moisture content to 0 cm (submerged), 40 cm and 80 cm groundwater levels below the soil surface to water use efficiency, nitrogen, phosphorous and The relative parameters were defined as the ratio of the parameters under submerged conditions (0 cm groundwater level below the soil surface) to these under upland conditions (40 cm and 80 cm groundwater levels below soil surface). The results indicated that different genotypes showed different relative root parameters and relative nutrition content and water use efficiency under different WSC. The lengt h and number of adventitious root are are important than seminal root length in water and nutrition uptake, and maintain the grain yield and increasing dry matter, but the adventitious root number could not be served as an index for screening drought-resistant genotypes. different drought-resistant genotypes have been found, and Azucena was resistant to drought, IR1552 sensitive to drought and Jia 9522 neither sensitive nor resistant to drought.
其他文献
高校在开展体育课中难免会出现学生运动损伤事故,依据损伤的分类、损伤的原因做重点分析。从医学院角度出发,提出预防运动损伤的建议,目的是使大学生掌握科学的体育锻炼方法
经颅重复磁刺激是近年来在经颅磁刺激的基础上发展起来的一种新的神经电生理技术。临床应用方面从单纯的诊断、评估扩大到治疗。本文就其基本原理、安全性能及临床应用进展进
随着美术基础教育的改革,肩负着培养中小学美术教育师资的高师美术教育也面临着严峻的挑战。高师教育和美术基础教育犹如鱼和水的关系,密不可分。教师队伍的素质直接关系到基
目的为提高水下获取的结构物表面缺陷图像的对比度和清晰度,便于缺陷区域的分割、提取和识别工作,提出了一种基于改进的湍流模型和引导滤波平滑的retinex的图像增强方法。方法将光照不均的水下图像转换到Lab空间,对亮度空间进行自适应直方图均衡的匀光处理,根据暗通道先验理论估算匀光图像的透射率,结合大气湍流通用模型模拟退化图像,通过调整透射率系数获得退化图像。采用维纳滤波过滤图像噪声,将滤波后的图像作为
目的行人再识别是指在一个或者多个相机拍摄的图像或视频中实现行人匹配的技术,广泛用于图像检索、智能安保等领域。按照相机种类和拍摄视角的不同,行人再识别算法可主要分为基于侧视角彩色相机的行人再识别算法和基于俯视角深度相机的行人再识别算法。在侧视角彩色相机场景中,行人身体的大部分表观信息可见;而在俯视角深度相机场景中,仅行人头部和肩部的结构信息可见。现有的多数算法主要针对侧视角彩色相机场景,只有少数算法
伴随着国家房地产调控政策持续细化,2013年我国房地产行业正式步入“政策性调整和市场化竞争双轨并行”的新时期。在抑制房产市场投机和扩大保障房建设的背景下,作为房地产政
基于传统的多媒体教学方式,构建新的交互式多媒体课堂教学模式,以改变传统教学方式及学习方式,并对该教学模式的特征、教学方法、评价标准等问题进行了系统阐述,同时给出了交互式
目的人脸识别技术在很多领域起着重要作用,但大量的欺诈攻击对人脸识别产生了威胁,比如打印攻击和重放攻击。传统的活体检测方法是以手工方式提取特征且缺乏对时间维度的考虑,导致检测效果不佳。针对以上问题,提出一种结合混合池化的双流活体检测网络。方法对数据集提取光流图像并进行面部检测,得到双流网络的两个输入;在双流网络末端加入空间金字塔和全局平均混合池化,利用全连接层对池化后的特征进行分类并进行分数层面的融
目的虹膜作为一种具有高稳定性与区分性的生物特征,使得虹膜识别在应用场景中十分普及,但很多虹膜识别系统在抵御各类演示攻击时无法保证十足的可靠性,导致虹膜识别在高级安全场景中的应用受限,使得虹膜活体检测成为生物识别技术中亟需解决的问题之一。现有的区分真实与假体虹膜最先进的算法主要依靠在原始灰度空间中提取的虹膜纹理深度特征,但这类特征差异不明显,只能辨别单源假体虹膜。为此,提出一种基于增强型灰度图像空间
随着分子农业(molecular pharming)研究领域的不断扩大,利用植物生产免疫球蛋白、酶、病毒样颗粒和疫苗的研究已成为主要焦点.2012年9月21日,由EuroSciCon主办的”分子农业——利用植物生产药物的最新进展”会议在英国召开.这次会涉及生物制药的各个研究热点,包括单克隆抗体、病毒样颗粒(如登革病毒和人乳头瘤病毒)在叶绿体表达系统瞬时表达、红花籽生产载脂蛋白、新型生产平台(如通过