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Diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response of six parental lines of maize released in three eras

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Journal of Integrative Agriculture 2019年第12期18卷 2732-2741页

作者： LI Cong-feng DONG Shu-ting LIU Rui-xian REN Hong DING Zai-song ZHAO Ming Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of Agriculture and Rural AffairsBeijing 100081P.R.China College of Agriculture Shandong Agricultural University/State Key Laboratory of Crop BiologyTai'an 271018P.R.China Jiangsu Academy of Agricultural Sciences Nanjing 210014P.R.China

Over the past seven decades, the grain yield of maize(Zea mays L.) has increased continuously in China, mostly due to hybridization innovations, particularly recent genetic improvements in photosynthesis. In order to reveal photosynthetic characters of elite inbred lines in different ears, a field experiment was conducted at the North China Plain of Shandong Province in China. Six parental lines of maize introduced in three eras(the 1960 s, 1980 s, and 2000 s) were investigated diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response characteristic at the grain filling stage. Compared to earlier parental lines, the 2000 s parental lines always had higher net photosynthetic rate(Pn) throughout the day, especially at noon, and a mid-day depression in Pn did not occur in all hybrids parental lines. Moreover, the stomatal conductance(Gs) and water use efficiency(WUE) of the 2000 s’ lines showed higher value than those of the 1960 s’ and 1980 s’ lines. The inbred lines differences in photosynthetic parameters were partly owing to their different quantum carboxylation efficiencies and light synthase activities. Simultaneously, the 2000 s parental lines exhibited lower light and CO2 compensation points, and their higher apparent quantum yield, and carboxylation efficiency. These suggested that the modern parental lines required lower light intensity and less CO2 to maintain a relatively high photosynthetic capacity, substantially increasing leaf physical quality and stress resistance. It provided crucial information of high photo-efficiency and stress-resistance breeding in maize.

关键词： maize pare ntal in bred lin es diur nal variati on photosynthetic resp on se three eras

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Research on the Optimal Dose of FSH for Superovulation of Mongolian Cattle

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Agricultural Biotechnology 2014年第6期3卷 31-33,37页

作者： Lidong HAN Feng WANG Shenyuan WANG Dong ZHANG Chunhua HUANG Gang ZHONG Xianbao ZHANG Lijun ZHOU Zhichao ZHAO Yingchun XU Li ZHANG College of Life Science Inner Mongolia Agricultural University Inner Mongolia Key Laboratory of Bio-manufacturing College of Life Sciences Nankai University Inner Mongolia Livestock Improvement Station Baotou Livestock Improvement Station

In this study, purebred Mongolian cattle were treated with a series of technical means including superovulation, artificial insemination, non-surgical embryo flushing, embryo grading and embryo cryopreservation, aiming at exploring a set of mature, stable production and breeding program for purebred Mongolian cattle embryos. The results showed that the optimal dose of FSH for superovulation of bred Mongolian cattle was 410 IU; the optimal dose of FSH for superovulation of muhiparous Mongolian cattle was 440 IU. bred Mongolian cattle exhibited higher average number of available embryos and embryo utilization rate compared with muhiparous Mongolian cattle, but the latter exhibited higher average number of embryos recovered.

关键词： Mongolian cattle Superovulation bred Multiparous FSH

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RED改进技术概述

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中国新通信 2007年第19期9卷 53-56页

作者：郑云平北京交通大学北京100044

RED技术的产生为解决网络的拥塞提供了良好的办法,但随着网络的发展、业务的丰富,RED技术的缺点也越来越明显。这种缺点的显现也推动了一系列的改进算法的产生,本文概述了各种改进算法之间的关系和各种算法的技术特点。

关键词： RED WRED FRED ARED bred CRED DWRED QPRED

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