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Differences of the basal culms anatomical characteristics.and the responses to nitrogen with different high-yielding rice populations

Differences of the basal culms anatomical characteristics an...

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2014年中国作物学会学术年会

作者： Jun Zhang Yunpan Song Yanfeng Ding Weijian Zhang Chengyan Zheng Zhenghui Liu Chengqiang Ding She Tang Shaohua Wang Ganghua Li Jiangsu Key Laboratory for Information Agriculture/National Engineering and Technology Center for Information/Key Laboratory of Crop Physiology and Ecology in Southern China Nanjing Agricultural University Institute of Crop Science Chinese Academy of Agricultural Sciences

Rice stem breaking resistance primarily depends on the basal culms *** main objectives of this study were to investigate the correlation between the basal culms bending strength and the anatomical characteristics.of high-yielding rice populations at different eco-sites and its responses to *** experiments were conducted at Taoyuan(a special high-yield eco-site) in Yunnan province and Danyang(representative eco-site of the middle and lower Yangtze) in Jiangsu province,China,in 2011 and *** super indica hybrid rice called ’Y Liangyou 2’ was grown at both eco-sites with N rate *** breaking strength at Taoyuan eco-site was significant higher than that of at *** greater structural carbohydrate concentration(*** and lignin) was primarily responsible for the higher bending stress at Taoyuan *** numbers of the sclerenchymatous cell layer of primarily vascular bundles(PVB),secondary vascular bundles(SVB) and mechanic tissue(MT) of the rice basal culms at Taoyuan eco-site enhanced the basal culms stiffness and strength via the deeper lignifications,The intensive degree of PVB and SVB were higher at Taoyuan than that at Danyang,which primarily caused by the weaker culms diameter and wall ***,the distance between the PVB and SVB to the periphery at Taoyuan eco-site was nearer,which increased the stem stiffness and the outer fibers endure maximal *** N input increased,the radial direction length,circumferential direction length,the numbers of sclerenchymatous cell layer of PVB and SVB increased significantly at Taoyuan,which strengthened the cellulose and ***,all of these varied slightly at Danyang,the cellulose and lignifications content decreased with the increasing *** results suggested that the response to nitrogen on the culms mechanical strength primarily reflected on the NSC varies,and the steadily improvement of basal culms mechanical strength in the high-yield rice

关键词： High-yielding population Rice Carbohydrate anatomical characteristics.

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