Dwindling supplies of bamboo resources and the increase in the demand for bamboo ha</span></span><span><span><span style="font-family:"">ve</span></span></sp...Dwindling supplies of bamboo resources and the increase in the demand for bamboo ha</span></span><span><span><span style="font-family:"">ve</span></span></span><span><span><span style="font-family:""> led to the need for better propagation techniques. This is the only way to ensure the sustainability of the bamboo resource base and improve livelihoods. Thus, this study was carried out to examine the different growth parameters of culm cuttings of <i>Bambusa vulgaris</i> in propagation beds with a substrate consisting of dark soil, manure (compost) and sand in a ratio of 1:1:1. Data on different growth parameters was collected on a daily basis over a three week period and analyzed using appropriate descriptive and inferential statistics. It was found that the different growth parameters (diameter, height, leaves and sheaths) of culm cuttings of <i>B. vulgaris</i> evolved in like manner in three propagation beds. Descriptive statistics for growth parameters of culm cuttings of <i>B. vulgaris</i> showed little or no differences across three shelter/propagation beds (shelter bed 1, shelter bed 2 and shelter bed 3) with 1.4675 ± 1.6172 cm, 93 ± 112 cm, 22 ± 30 leaves, and 4 ± 6 sheaths being the mean diameter, height, number of leaves and number of sheaths for all three propagation beds, respectively. ANOVA test showed no statistically significant variation (<i>p</i> > 0.05) between growth parameters of culm cuttings of <i>B. vulgaris</i> across the three propagation beds, implying that the different growth parameters were relatively similar. Pearson correlation showed the existence of direct and inverse relationships between the different growth parameters of culm cuttings of bamboo. The existence of these direct and inverse relationships could be attributed to the rapid growth rate of bamboo, the substrate used, and the species of bamboo used (<i>B. vulgaris</i>). The study recommends more large-scale propagation projects of this bamboo species in order to ensure the sustainability of the bamboo resource base and improve livelihoods of bamboo dependent rural communities.展开更多
The leafing rates of fourteen rice varieties were measured in a sowing-time experiment, and a rapid leafing genotype at the vegetative growth stage was discovered in an indica variety Yanhui 559. The leaf number on th...The leafing rates of fourteen rice varieties were measured in a sowing-time experiment, and a rapid leafing genotype at the vegetative growth stage was discovered in an indica variety Yanhui 559. The leaf number on the main culm of Yanhui 559 was always 4-5 leaves more than that of Lemont, and the leafing rate of Yanhui 559 was significantly higher than that of Lemont based on similar growth durations from sowing to heading. Furthermore, the difference of the leafing rate was significant at the vegetative growth stage, but not distinctive at the panicle initiation stage. Genetic analysis of the leafing rates in the two backcross populations of Yanhui 559 and Lemont showed that major and quantitative genes controlled the expression of rapid leafing character. Based on results of investigation for some plants with similar growth durations in the backcrossing populations, the rapid leafing genotypes exhibited earlier tillering and more tiller numbers per plant, and its yield components including the number of panicles per plant and number of grains per panicle were superior to those of the slow leafing genotypes. Further research and application feasibility of the rapid leafing genotype in breeding were discussed.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
文摘Dwindling supplies of bamboo resources and the increase in the demand for bamboo ha</span></span><span><span><span style="font-family:"">ve</span></span></span><span><span><span style="font-family:""> led to the need for better propagation techniques. This is the only way to ensure the sustainability of the bamboo resource base and improve livelihoods. Thus, this study was carried out to examine the different growth parameters of culm cuttings of <i>Bambusa vulgaris</i> in propagation beds with a substrate consisting of dark soil, manure (compost) and sand in a ratio of 1:1:1. Data on different growth parameters was collected on a daily basis over a three week period and analyzed using appropriate descriptive and inferential statistics. It was found that the different growth parameters (diameter, height, leaves and sheaths) of culm cuttings of <i>B. vulgaris</i> evolved in like manner in three propagation beds. Descriptive statistics for growth parameters of culm cuttings of <i>B. vulgaris</i> showed little or no differences across three shelter/propagation beds (shelter bed 1, shelter bed 2 and shelter bed 3) with 1.4675 ± 1.6172 cm, 93 ± 112 cm, 22 ± 30 leaves, and 4 ± 6 sheaths being the mean diameter, height, number of leaves and number of sheaths for all three propagation beds, respectively. ANOVA test showed no statistically significant variation (<i>p</i> > 0.05) between growth parameters of culm cuttings of <i>B. vulgaris</i> across the three propagation beds, implying that the different growth parameters were relatively similar. Pearson correlation showed the existence of direct and inverse relationships between the different growth parameters of culm cuttings of bamboo. The existence of these direct and inverse relationships could be attributed to the rapid growth rate of bamboo, the substrate used, and the species of bamboo used (<i>B. vulgaris</i>). The study recommends more large-scale propagation projects of this bamboo species in order to ensure the sustainability of the bamboo resource base and improve livelihoods of bamboo dependent rural communities.
文摘The leafing rates of fourteen rice varieties were measured in a sowing-time experiment, and a rapid leafing genotype at the vegetative growth stage was discovered in an indica variety Yanhui 559. The leaf number on the main culm of Yanhui 559 was always 4-5 leaves more than that of Lemont, and the leafing rate of Yanhui 559 was significantly higher than that of Lemont based on similar growth durations from sowing to heading. Furthermore, the difference of the leafing rate was significant at the vegetative growth stage, but not distinctive at the panicle initiation stage. Genetic analysis of the leafing rates in the two backcross populations of Yanhui 559 and Lemont showed that major and quantitative genes controlled the expression of rapid leafing character. Based on results of investigation for some plants with similar growth durations in the backcrossing populations, the rapid leafing genotypes exhibited earlier tillering and more tiller numbers per plant, and its yield components including the number of panicles per plant and number of grains per panicle were superior to those of the slow leafing genotypes. Further research and application feasibility of the rapid leafing genotype in breeding were discussed.
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。
