| 曹芳,赵泽茹,魏永胜.钾水互作对烟草光合特性的影响[J].干旱地区农业研究,2010,28(5):138~142 |
| 钾水互作对烟草光合特性的影响 |
| Interactive effect of water and potassium on photosynthesis of tobacco |
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| DOI：10.7606/j.issn.1000-7601.2010.05.26 |
| 中文关键词: 钾水互作 烟草 光合特性 |
| 英文关键词:interactive of water and potassium tobacco photosynthetic characteristics |
| 基金项目:西北农林科技大学青年科学基金（04ZM049, 06ZR032） |
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| 中文摘要: |
| 为探讨钾水互作对烟草植株形态和光合特性的影响，以云烟89（Nicotiana tabacum L.）为材料，通过盆栽沙培试验测定不同水分和钾处理相互组合下烟草株高、叶长、叶宽、叶片数以及光合速率、蒸腾速率、气孔导度和胞间CO2浓度等指标。试验设置正常供水、轻度干旱胁迫和重度干旱胁迫3个水分处理，以及施K+浓度分别为2.4、5.4、9.9 mmol/L 3个钾处理。结果表明： 水分对株高和叶片数的影响显著；钾对叶长和叶宽的影响显著；水分和钾水互作对净光合速率及气体交换参数的影响显著。轻度水分胁迫下，高钾处理有利于烟草光合作用；重度水分胁迫下，高钾处理不利于烟草光合作用。低钾处理下，随着水分胁迫加重光合速率下降是由气孔因素引起的；高钾处理下，随着水分胁迫加重光合速率下降是由非气孔因素引起的。正常供水条件下，5.4 mmol/L的钾浓度是最佳浓度。 |
| 英文摘要: |
| The experiment of the interactive effect of potassium and water on tobacco（Nicotiana tabacum L.）over ground modality and photosynthesis was carried out in pots with sand. There were three water treatments and three potassium treatments. The plant height, total number of leaves, leaf length, leaf width and the photosynthetic rate, transpiration rate, intercellular CO2 concentration and stomatal conductance were measured. The results showed: The effect of water on plant height and total number of leaves are significant; The effect of potassium on leaf length and leaf width are significant; The interactive effect of water and potassium on photosynthesis are significant. Under light drought stress condition, high potassium treatment plays active role on photosynthesis; while under severe water deficiency condition, the effect of high potassium on photosynthesis is negative. Under low potassium condition, as water stress become severe, the net photosynthetic rate decreases because of stomatal factor; while under high pota
ssium treatment, it is non-stomatal factors that lead to the net photosynthetic rate decrease. Under normal water supply, 5.4 mmol/L potassium concentration is optimum. |
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