Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying
文献类型：期刊论文
| 作者 | Xu B. -C. ; Deng X. -P. ; Zhang S. -Q |
| 刊名 | PHOTOSYNTHETICA
 |
| 出版日期 | 2010 |
| 卷号 | 48期号:8页码:481-487 |
| 关键词 | hydraulic root signal root:shoot ratio nonhydraulic root signal water stress |
| 通讯作者 | Xu, BC |
| 英文摘要 | This study compared physiological and growth responses to water stress of two legume species during the seedling stage. Potted alfalfa (Medicago sativa L. cv. Algonquin) and milkvetch (Astragalus adsurgens Pall. cv. Pengyang earlymaturing vetch) seedlings were grown under well-watered [soil water content (SWC) maintained at 14.92% daily] or water-stressed conditions (drying) for 15 days. Net photosynthetic rate (P (N)), transpiration rate (E) and stomatal conductance (g (s)) of both species decreased parabolically. When SWC decreased to 7.2% and 10.3%, g (s) values for alfalfa and milkvetch were significantly different from those of the respective well-watered plants (p < 0.05). When SWC decreased to 6.6% for alfalfa and 6.8% for milkvetch, leaf water potentials (psi(L)) were significantly different from those of the well-watered plants (p < 0.05). Thus the difference between the SWC thresholds for a nonhydraulic root signal (nHRS) and a hydraulic root signal (HRS) were 0.6% and 3.5% for alfalfa and milkvetch, respectively. Milkvetch had a lower g (s) than alfalfa for a given SWC (p < 0.05). Although alfalfa seedlings had a higher dry mass (DM) and root:shoot ratio (R/S) than milkvetch in both treatments (p < 0.05), we concluded that milkvetch seedlings had greater drought tolerance than alfalfa. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2012-06-04 |
| 源URL | [http://ir.iswc.ac.cn/handle/361005/4734]  |
| 专题 | 水土保持研究所_水保所知识产出(1956-2013) |
| 推荐引用方式 GB/T 7714 | Xu B. -C.,Deng X. -P.,Zhang S. -Q. Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying[J]. PHOTOSYNTHETICA,2010,48(8):481-487. |
| APA | Xu B. -C.,Deng X. -P.,&Zhang S. -Q.(2010).Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying.PHOTOSYNTHETICA,48(8),481-487. |
| MLA | Xu B. -C.,et al."Biomass partition, leaf gas exchange and water relations of alfalfa and milkvetch seedlings in response to soil drying".PHOTOSYNTHETICA 48.8(2010):481-487. |
入库方式： OAI收割
来源：水土保持研究所
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