摘要
探明氮高效水稻品种的冠层特征,对于培育和筛选氮高效品种具有重要意义。以2个氮高效品种武运粳30号和连粳7号及2个氮低效品种扬粳4038和宁粳1号作为材料进行大田试验,观察了两类水稻品种的冠层特征及其与产量和氮肥利用率间的关系。结果表明,与氮低效品种相比,氮高效品种总颖花量、结实率、产量和氮肥利用率较高;氮高效品种抽穗期具有较高的单茎茎鞘重、光合速率、光合氮素利用效率、剑叶厚度、比叶重、中上层冠层的光截获量及冠层顶部比叶氮含量、氮消减系数和光氮匹配度,上述主要冠层特征与产量及氮素籽粒生产效率呈显著或极显著正相关。这些冠层特征可作为筛选和培育氮高效水稻品种以及培育高产高效群体的重要指标。
Elucidating the canopy characteristics for nitrogen(N)-efficient rice varieties has great significance for screening N-efficient varieties.In this study,two N-efficient rice varieties Wuyunjing 30 and Lianjing 7 and two N-inefficient rice varieties Yangjing 4038 and Ningjing 1 were used and grown in the paddy field.The canopy characteristics of the two types of varieties and their relationships with grain yield and nitrogen use efficiency were investigated.Results showed that compared with N-inefficient varieties,N-efficient varieties had a higher grain yield and nitrogen use efficiency,mainly due to a larger number of total panicles and a greater filled-grain percentage,the N-efficient varieties showed greater stem-sheath weight per tiller,higher photosynthetic rate and photosynthetic nitrogen use efficiency(NUE),higher leaf thickness,specific leaf weight of the flag leaf,greater light interception rate in the middle and upper layer of a canopy,higher canopy top specific leaf N content,greater N extinction coefficient,better N-light matching degree,above-mentioned canopy traits were significantly and positively correlated with the grain yield and internal nitrogen use efficiency.These canopy traits could be considered as indexes for breeding and screening N-efficient rice varieties and for cultivating a population with high grain yield and high NUE.
作者
申勇
谢昊
潘竹栋
朱宽宇
王志琴
杨建昌
Shen Yong;Xie Hao;Pan Zhudong;Zhu Kuanyu;Wang Zhiqin;Yang Jianchang(Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Agricultural College,Yangzhou University,Yangzhou 225009,Jiangsu,China)
出处
《作物杂志》
北大核心
2021年第1期90-97,共8页
Crops
基金
国家重点研发计划(2018YFD0300800,2016YFD0300206-4)。
关键词
籽粒产量
氮肥利用率
叶片厚度
比叶重
光截获
氮消减系数
Grain yield
Nitrogen use efficiency
Leaf thickness
Specific leaf weight
Light interception
Nitrogen extinction coefficient
