We analyzed the relationship between internode number and intemode length for one of the largest bamboo, Phyllostachys pubescens Mazel ex Houz. For 50 sample culms with various sizes felled in a pure stand of P. pubes...We analyzed the relationship between internode number and intemode length for one of the largest bamboo, Phyllostachys pubescens Mazel ex Houz. For 50 sample culms with various sizes felled in a pure stand of P. pubescens, the intemode number was assigned from base to tip and the length for each internode was directly measured. The result indicated that the intemode length should be cumulated from base to tip, and then the cumulated internode length should be relativized by the total culm length. It was inappropriate to relativize the internode length by the maximum intenode length. In addition, the relationship between the relative internode number （the intemode number relativized by the total number of intemodes） and the relative cumulated internode length should be described not by a power function but by a sigmoid function such as the third-order function. The determined function enabled us to estimate the actual internode length, with the root mean squared error being 4 cm. In conclusion, the mathematical expression presented here, i.e., the relativization of the cumulated internode length by the total culm length and the application of the sigmoid function, will be useful in describing the relationship between internode number and internode length for P. pubescens.展开更多
在杭州进行的以二棱皮大麦浙农大3号(Hordeum distichum L. var. Z. A. U no.3)和四棱皮大麦威24(H. vulgare L. var V24)为材料的田间试验结果显示,选用的5种植物生长调节剂(组合)中,GR90—2、GR90—4和GR90—5在孕穗期一次性叶面喷播...在杭州进行的以二棱皮大麦浙农大3号(Hordeum distichum L. var. Z. A. U no.3)和四棱皮大麦威24(H. vulgare L. var V24)为材料的田间试验结果显示,选用的5种植物生长调节剂(组合)中,GR90—2、GR90—4和GR90—5在孕穗期一次性叶面喷播可有效地降低收获期的植株高度,且除GR90—5处理的行粒产量显著低于对照外,其它处理的籽粒产量与对照均无显著差异。对主茎各节间长度的分析表明:除GR90—1外,生长调节剂处理均使植株的穗下节和倒二节节间显著缩短,其中处理GR90—5还显著缩短了基部第二节间的长度。鉴此,作者认为,通过调整喷播时期和剂量,可望获得能有效控制冬大麦节间长度、增强植株抗倒伏能力,在正常生长条件下对产量无不良影响的生长调节剂配方。展开更多
基金supported in part by the fiscal 2010 special grant from the president of the Prefectural University of Kumamoto
文摘We analyzed the relationship between internode number and intemode length for one of the largest bamboo, Phyllostachys pubescens Mazel ex Houz. For 50 sample culms with various sizes felled in a pure stand of P. pubescens, the intemode number was assigned from base to tip and the length for each internode was directly measured. The result indicated that the intemode length should be cumulated from base to tip, and then the cumulated internode length should be relativized by the total culm length. It was inappropriate to relativize the internode length by the maximum intenode length. In addition, the relationship between the relative internode number （the intemode number relativized by the total number of intemodes） and the relative cumulated internode length should be described not by a power function but by a sigmoid function such as the third-order function. The determined function enabled us to estimate the actual internode length, with the root mean squared error being 4 cm. In conclusion, the mathematical expression presented here, i.e., the relativization of the cumulated internode length by the total culm length and the application of the sigmoid function, will be useful in describing the relationship between internode number and internode length for P. pubescens.
文摘在杭州进行的以二棱皮大麦浙农大3号(Hordeum distichum L. var. Z. A. U no.3)和四棱皮大麦威24(H. vulgare L. var V24)为材料的田间试验结果显示,选用的5种植物生长调节剂(组合)中,GR90—2、GR90—4和GR90—5在孕穗期一次性叶面喷播可有效地降低收获期的植株高度,且除GR90—5处理的行粒产量显著低于对照外,其它处理的籽粒产量与对照均无显著差异。对主茎各节间长度的分析表明:除GR90—1外,生长调节剂处理均使植株的穗下节和倒二节节间显著缩短,其中处理GR90—5还显著缩短了基部第二节间的长度。鉴此,作者认为,通过调整喷播时期和剂量,可望获得能有效控制冬大麦节间长度、增强植株抗倒伏能力,在正常生长条件下对产量无不良影响的生长调节剂配方。
