| Effects of fertilizer ratio on the photosynthetic rate and the nitrogen metabolism of grape under water stress |
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| DOI：10.16302/j.cnki.1000-7601.2015.01.005 |
| Key Words: centennial seedless grape water and fertilizer ratio photosynthetic rate NR GS GPT |
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| Abstract: |
| To investigate the effects of fertilizer ratio on leaves area, chlorophyll content, and key enzymes of nitrogen metabolism under water stress in grape, Centennial Seedless was used with three different water treatment levels and three kinds of fertilizer ratios. The results showed that at the germination and fruit-set stages, a water treatment using 55%～60% that of the field capacity and a fertilizer ratio of N∶P∶K=2∶5∶3 could effectively increase the leaves area and the chlorophyll content of grape leaves, and could also effectively improve the photosynthetic rate. At the color-changing and post-harvesting stages, maintenance of normal water content and proper increase of potassium could improve photosynthetic rate. A water treatment using 55%～60% that of the field capacity and a fertilizer ratio of N∶P∶K=2∶5∶3 could effectively enhance the NR activity and promote the absorption and utilization of nitrogen fertilizer. The GS activity became increased first and was then decreased by water stress, whereas the GPT activity kept increased. At mild stress level, increase of potassium fertilizer could lead to the elevation of NR, GPT and GS activities, improving the transformation and utilization of nitrogen fertilizer. |
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