| Interactive effect of water and potassium on photosynthesis of tobacco |
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| DOI：10.7606/j.issn.1000-7601.2010.05.26 |
| Key Words: interactive of water and potassium tobacco photosynthetic characteristics |
| Author Name | Affiliation | | CAO Fang | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHAO Zeru | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | WEI Yongsheng | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| 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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