| 遮荫条件下9个紫花苜蓿品种苗期形态及生长响应 |
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| 引用本文： | 覃凤飞,沈益新,周建国,王庆师,孙志成,王波.遮荫条件下9个紫花苜蓿品种苗期形态及生长响应[J].草业学报,2010,19(3):204-211. |
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| 作者姓名： | 覃凤飞 沈益新 周建国 王庆师 孙志成 王波 |
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| 作者单位： | 南京农业大学动物科技学院,江苏 南京,210095 |
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| 基金项目： | 南京农业大学青年科技创新基金，国家科技支撑计划项目 |
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| 摘 要： | 采用遮荫试验,研究了光对9个苜蓿品种苗期形态特征及生长动态的影响。结果表明,不同遮荫处理下苜蓿品种间株高变化有较大的差异,游客表现出最弱的耐阴性;随光照减弱,各品种根颈分枝数、主根粗、二级侧根数、根瘤数、叶片厚度和叶片数均显著下降,表现出较强光环境下更强的形态可塑性;各品种主根长无显著变化,总叶面积动态中新疆大叶、苜蓿王和德宝变化不显著,其他品种显著下降。各品种生物量随遮荫强度增加而显著下降,弱光下各品种生物量对根系的分配明显下降,对茎和叶的分配增加,叶面积比随光强减弱明显增大,相对生长速率随光强减弱显著下降。不同品种同一器官对光环境变化的反应程度不一致,反映了苜蓿各品种耐阴机制的差异。
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| 关 键 词： | 紫花苜蓿 苗期 遮荫 形态 生长响应 |
| 收稿时间： | 1900-01-01; |
Seedling morphology and growth responses of nine Medicago sativa varieties to shade conditions |
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| QIN Feng-fei,SHEN Yi-xin,ZHOU Jian-guo,WANG Qing-shi,SUN Zhi-cheng,WANG Bo.Seedling morphology and growth responses of nine Medicago sativa varieties to shade conditions[J].Acta Prataculturae Sinica,2010,19(3):204-211. |
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| Authors: | QIN Feng-fei SHEN Yi-xin ZHOU Jian-guo WANG Qing-shi SUN Zhi-cheng WANG Bo |
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| Institution: | College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: | The seedling morphological characteristics and growth dynamics of nine Medicago sativa varieties under shade were studied.The height of Eureka showed significantly less plasticity than other varieties under different levels of shading.All varieties showed a larger morphological plasticity at lower light intensities than at higher intensities:They developed distinctly fewer crown ramus,root nodes,leaves and secondary lateral roots,thinner leaves and taproots at lower intensities.Light intensity had little ef... |
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| Keywords: | Medicago sativa seedling shading morphology growth response |
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