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Analysis on Morphological Variations among Six Wild Groups of Anthocidaris crassispina from South China Sea

Agricultural Science & Technology 2015年第12期16卷 2774-2778,2808页

作者：罗虹霞陈丕茂黎小国袁华荣王莲莲冯雪中国水产科学研究院南海水产研究所/农业部南海渔业资源环境科学观测实验站/中国水产科学研究院海洋牧场技术重点实验室广东广州510300 上海海洋大学海洋与科学学院上海201306 大连海洋大学海洋科技与环境学院辽宁大连116023

In order to study the morphological variations among wild Anthocidaris crassispina groups in the southeast coast of China, six groups collected from Daya Bay, Egong Bay, Hailing Island, and Nan＇ao Island in Guangzhou Province, Weizhou Island in Guangxi Province and Ningde City in Fujian Province were analyzed in this paper. Six morphometric traits were measured and the degrees of morphological variations among wild Anthocidaris crassispina groups were compared using four multivariate analyses, one-way ANOVA analysis, variation coefficient method, cluster analysis and discriminant analysis. The results of one-way ANOVA analysis showed that there were significant differences in the six morphometric traits between Weizhou Island＇s population and the other five groups. The variation coefficient analysis showed that the difference between the Weizhou Island＇s population and Hailing Is- land＇s population reached the interspecific level. The results of cluster analysis showed that the morphometric characters of Daly Bay＇s population, Egong Bay＇s population and Nan＇ao＇s population were more similar, but the groups from Weizhou Island and Ningde City were the most divergent. The discriminant analysis showed that the identification accuracy of A. crassispina was 47.8%-86%, and the total dis- criminant accuracy was 65.3%. All the analysis results above suggest that certain morphological variation has been generated among A. crassispina groups from differ- ent origins due to geographical isolation and different environmental factors.

关键词： Anthocidaris crassispina Wild population Morphology Multivariate anal- ysis South China Sea

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Effects of Seed Rate on Root Twining Power and Seedling Quality of Machine-transplanted Super Rice

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Agricultural Science & Technology 2015年第12期16卷 2644-2648,2652页

作者：滕飞朱德峰陈惠哲蔡雪青徐一成中国水稻研究所/水稻生物学国家重点实验室浙江杭州310006 北京市农业机械试验鉴定推广站北京100079

In order to investigate the effects of seed rate on root twining power and seedling quality of machine-transplanted super rice cultivars, Yongyou 12 and Zhongzheyou No.l, total 6 seed rates were arranged, and the growth characteris- tics, quality and root twining power of machine-transplanted rice seedlings were studied. The results showed that seed rate had great effects on root twining power and qualityof rice seedlings; with the increase of seed rate, the root twining power of rice seedlings was increased, but the quality of rice seedlings was significantly reduced; under the condition of high seed rate, rice seedlings were weak with less accumulate dry matter and nonuniform growth, and the proportion of weak seedlings was higher. When the seed rate of both rice cultivars was reduced by 10 g/tray, the average seedling height was increased by 0.5 cm, leaf age was increased by 0.1, stem base diameter was increased by 0.1 cm, and root number per plant was increased by 0.3. When the seed rate was increased by 10 g/tray, the accumulated dry matter per plant was reduced by 5.1 mg. With the increase of seed rate, the seedling quality of Zhongzheyou No.1 was decreased rapidly, and the proportion of weak seedlings was increased rapidly. However, Yongyou 12 has a larger elasticity in seed rate. When the seed rate reached to 50 g/tray, blanket seedlings of Yongy- ou 12 were nursed with uniform growth and higher quality, but the shoots were sparse with lower leaf area index. However, when the seed rate was up to 50 g/tray, blanket seedlings of Zhongzheyou No.1 were nursed with uniform growth and higher quality, as well as higher-density shoots. From a comprehensive point of view, the optimum seed rates of Yongyou 12 and Zhongzheyou No.1 were 65 and 50 g/tray, respectively.

关键词： Rice Super rice Mechanical transplanting Seed rate Blanket seedling Seedling quality

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Breeding of Indica Rice CMS Line Renong 1A with Virescent-yellow Leaf

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Agricultural Science & Technology 2015年第6期16卷 1144-1146,1150页

作者：贺治洲谢振宇沈建凯王悦中国热带农业科学院热带作物品种资源研究所海南儋州571737 湖南农业大学农学院湖南长沙410128

Renong 1Ais a new indica CMS line with leaf color marker, developed by testcrossing and continuous backcrossing, using a spontaneous mutant with vires-cent-yel ow leaf isolated from the progenies of T98B /Jin 23B ×Yixiang 1B as the male parent, and Fengyuan A as the female parent. Al the chlorotic leaves of Renong 1A turn green in later developmental stages from leaf tip to base. This is the reason why Renong 1A is a new ideal leaf color marker material in indica rice. It shows apparent and stable leaf marker trait, good agronomic traits, high outcross-ing rate, complete pol en sterility, fine grain quality and high combining ability. Renong 1A has already been technical y identified and certified by Hainan Provincial Crop Variety Appraisal Committee in 2013.

关键词：热农1A Indica CMS line Renong 1A Leaf color marker Breeding

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