Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings
This study investigated the effects of nitrogen form on root activity and nitrogen uptake kinetics of <i>Camellia oleifera</i> Abel. seedlings, providing a scientific basis for improving nitrogen use efficiency and scientific fertilization in <i>C. oleifera</i> production. Ta...
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MDPI AG
2023-01-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/14/1/161 |
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| author | Rui Wang Zhilong He Zhen Zhang Ting Xv Xiangnan Wang Caixia Liu Yongzhong Chen |
| author_facet | Rui Wang Zhilong He Zhen Zhang Ting Xv Xiangnan Wang Caixia Liu Yongzhong Chen |
| author_sort | Rui Wang |
| collection | DOAJ |
| description | This study investigated the effects of nitrogen form on root activity and nitrogen uptake kinetics of <i>Camellia oleifera</i> Abel. seedlings, providing a scientific basis for improving nitrogen use efficiency and scientific fertilization in <i>C. oleifera</i> production. Taking one-year-old <i>C. oleifera</i> cultivar ‘Xianglin 27’ seedlings as subjects, 8 mmol·L<sup>−1</sup> of nitrogen in varied forms (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula>:<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> = 0:0, 10:0, 7:3, 5:5, 3:7, 0:10) was applied in this study as the treatment conditions to investigate the effects of different nitrogen forms on root activity and nitrogen uptake kinetics in <i>C. oleifera</i> seedlings. Comparing the performance of nutrient solutions with different <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula>:<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> ratios, the results showed that a mixed nitrogen source improved the root activity of <i>C. oleifera</i> seedlings based on total absorption area, active absorption area, active absorption area ratio, specific surface area, and active specific surface area. When <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula>:<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> = 5:5, the total absorption area and active absorption area of the seedling roots reached the maximum. The results of uptake kinetic parameters showed that Vmax <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> > Vmax <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula> and Km <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula> > Km <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula>, indicating that the uptake potential of ammonium–nitrogen by <i>C. oleifera</i> seedlings is greater than that of nitrate–nitrogen. The conclusion was that compared to either ammonium– or nitrate–nitrogen, the mixed nitrogen source was better for promoting the root activity of <i>C. oleifera</i> seedlings, and the best nitrate/ammonium ratio was 5:5. |
| first_indexed | 2024-03-09T12:40:49Z |
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| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-09T12:40:49Z |
| publishDate | 2023-01-01 |
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| series | Forests |
| spelling | doaj.art-5b8e04db1631460c9380151573c8bddd2023-11-30T22:18:35ZengMDPI AGForests1999-49072023-01-0114116110.3390/f14010161Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> SeedlingsRui Wang0Zhilong He1Zhen Zhang2Ting Xv3Xiangnan Wang4Caixia Liu5Yongzhong Chen6Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaResearch Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaResearch Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaResearch Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaResearch Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaResearch Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaResearch Institute of Oil Tea Camellia, Hunan Academy of Forestry, Shaoshan South Road, No. 658, Changsha 410004, ChinaThis study investigated the effects of nitrogen form on root activity and nitrogen uptake kinetics of <i>Camellia oleifera</i> Abel. seedlings, providing a scientific basis for improving nitrogen use efficiency and scientific fertilization in <i>C. oleifera</i> production. Taking one-year-old <i>C. oleifera</i> cultivar ‘Xianglin 27’ seedlings as subjects, 8 mmol·L<sup>−1</sup> of nitrogen in varied forms (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula>:<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> = 0:0, 10:0, 7:3, 5:5, 3:7, 0:10) was applied in this study as the treatment conditions to investigate the effects of different nitrogen forms on root activity and nitrogen uptake kinetics in <i>C. oleifera</i> seedlings. Comparing the performance of nutrient solutions with different <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula>:<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> ratios, the results showed that a mixed nitrogen source improved the root activity of <i>C. oleifera</i> seedlings based on total absorption area, active absorption area, active absorption area ratio, specific surface area, and active specific surface area. When <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula>:<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> = 5:5, the total absorption area and active absorption area of the seedling roots reached the maximum. The results of uptake kinetic parameters showed that Vmax <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula> > Vmax <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula> and Km <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></semantics></math></inline-formula> > Km <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msubsup><mrow><mi>NH</mi></mrow><mn>4</mn><mo>+</mo></msubsup></semantics></math></inline-formula>, indicating that the uptake potential of ammonium–nitrogen by <i>C. oleifera</i> seedlings is greater than that of nitrate–nitrogen. The conclusion was that compared to either ammonium– or nitrate–nitrogen, the mixed nitrogen source was better for promoting the root activity of <i>C. oleifera</i> seedlings, and the best nitrate/ammonium ratio was 5:5.https://www.mdpi.com/1999-4907/14/1/161<i>Camellia oleifera</i>root activitynitrate–nitrogenammonium–nitrogenuptake kinetics |
| spellingShingle | Rui Wang Zhilong He Zhen Zhang Ting Xv Xiangnan Wang Caixia Liu Yongzhong Chen Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings Forests <i>Camellia oleifera</i> root activity nitrate–nitrogen ammonium–nitrogen uptake kinetics |
| title | Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings |
| title_full | Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings |
| title_fullStr | Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings |
| title_full_unstemmed | Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings |
| title_short | Effects of Nitrogen Form on Root Activity and Nitrogen Uptake Kinetics in <i>Camellia oleifera</i> Seedlings |
| title_sort | effects of nitrogen form on root activity and nitrogen uptake kinetics in i camellia oleifera i seedlings |
| topic | <i>Camellia oleifera</i> root activity nitrate–nitrogen ammonium–nitrogen uptake kinetics |
| url | https://www.mdpi.com/1999-4907/14/1/161 |
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