| 半干旱区春小麦不同年代品种根系生长冗余的比较实验研究 |
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| 引用本文： | 张荣,张大勇.半干旱区春小麦不同年代品种根系生长冗余的比较实验研究[J].植物生态学报,2000,24(3):298-303. |
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| 作者姓名： | 张荣 张大勇 |
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| 作者单位： | [1]兰州大学干旱农业生态国家重点实验室 [2]北京师范大学生态学研究所 |
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| 基金项目： | 国家自然科学基金!( No.3 9670 14 0 ) |
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| 摘 要： | 研究了半干旱区几个春小麦品种的籽实产量、根量与根茎比的关系。表明在开花期地方品种和尚头较之现代品种有更大的根量和根茎比。产量因降水条件而不同：极端干旱的1995年，大根系品种与现代品种产量无显著差异(p>0.05)；在降水分配较为均匀的1996年，无论有、无灌溉条件，具较大根系的地方品种与现代品种的产量均最低(p<0.05)，而根量与品种产量及地上生物量呈显著的负相关。表明大根系品种在根系上存在着冗余，减少根系冗余可望成为半干旱区小麦高产育种的一条有效途径。
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| 关 键 词： | 春小麦 根系冗余 自然选择 产量 育种 |
| 修稿时间： | 1998-03-30 |
A COMPARATIVE STUDY ON ROOT REDUNDANCY IN SPRING WHEAT VARIETIES RELEASED IN DIFFERENT YEARS IN SEMI-ARID AREA |
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| ZHANG Rong,and ZHANG Da Yong.A COMPARATIVE STUDY ON ROOT REDUNDANCY IN SPRING WHEAT VARIETIES RELEASED IN DIFFERENT YEARS IN SEMI-ARID AREA[J].Acta Phytoecologica Sinica,2000,24(3):298-303. |
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| Authors: | ZHANG Rong and ZHANG Da Yong |
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| Affiliation: | ZHANG Rong 1 and ZHANG Da Yong 2 |
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| Abstract: | The relationships among grain yield, root size and root: shoot ratio were studied for spring wheat in semi-arid area. Our results demonstrate that the old landrace has higher root biomass and root: shoot ratios than modern varieties at the flowering stage. In the severe drought year of 1995, there was no significant difference in grain yield between the landrace and modern varieties(p>0.05). In 1996, with more normal rainfall, the landrace was the lowest productive variety, irrespective of whether it was irrigated or not. Negative correlations between root weight and yield, and between root weight and above-ground biomass were observed. Root redundancy is suggested since the landrace produced lower yield under conditions of favorable rainfall. Reduction of root system to a reasonable size may be an effective way to improve the yield of spring wheat in semi-arid areas. |
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| Keywords: | Spring wheat Root system redundancy Natural selection through competition Evolution and breeding |
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