Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply
The application of nitrogen fertilizer within a normal range has been found to increase the leaf nitrogen content and photosynthetic rate of canola plants (Brassica napus L.). Despite numerous studies on the separate effects of CO2 diffusion limitation and nitrogen allocation trade-off on photosynth...
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Frontiers Media S.A.
2023-05-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2023.1171331/full |
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| author | Jiahuan Liu Kangkang Zhang Junguo Bi Xinqiao Yu Lijun Luo Liyong Hu |
| author_facet | Jiahuan Liu Kangkang Zhang Junguo Bi Xinqiao Yu Lijun Luo Liyong Hu |
| author_sort | Jiahuan Liu |
| collection | DOAJ |
| description | The application of nitrogen fertilizer within a normal range has been found to increase the leaf nitrogen content and photosynthetic rate of canola plants (Brassica napus L.). Despite numerous studies on the separate effects of CO2 diffusion limitation and nitrogen allocation trade-off on photosynthetic rate, few have examined both these factors in relation to the photosynthetic rate of canola. In this study, two genotypes of canola with varying leaf nitrogen content were analyzed to determine the impact of nitrogen supply on leaf photosynthesis, mesophyll conductance, and nitrogen partitioning. The results showed that the CO2 assimilation rate (A), mesophyll conductance (gm), and photosynthetic nitrogen content (Npsn) increased with an increase in nitrogen supply in both genotypes. The relationship between nitrogen content and A followed a linear-plateau regression, while A had linear relationships with both photosynthetic nitrogen content and gm, indicating that the key to enhancing A is increasing the distribution of leaf nitrogen into the photosynthetic apparatus and gm, rather than just increasing nitrogen content. Under high nitrogen treatment, the genotype (QZ) with high nitrogen content had 50.7% more nitrogen than the other genotype (ZY21), but had similar A, which was primarily due to ZY21’s higher photosynthetic nitrogen distribution ratio and stomatal conductance (gsw). On the other hand, QZ showed a higher A than ZY21 under low nitrogen treatment as QZ had higher Npsn and gm compared to ZY21. Our results indicate that, in selecting high PNUE rapeseed varieties, it is important to consider the higher photosynthetic nitrogen distribution ratio and CO2 diffusion conductance. |
| first_indexed | 2024-04-09T13:56:05Z |
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| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-04-09T13:56:05Z |
| publishDate | 2023-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-ccc562c990b543e9aba6dd05525c62252023-05-08T04:58:44ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2023-05-011410.3389/fpls.2023.11713311171331Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supplyJiahuan Liu0Kangkang Zhang1Junguo Bi2Xinqiao Yu3Lijun Luo4Liyong Hu5Ministry of Agriculture and Rural Affairs (MARA) Key Laboratory of Crop Ecophysiology Farming System in the Middle Reaches of the Yangtze River, College of Plant Science Technology, Huazhong Agricultural University, Wuhan, ChinaShanghai Agrobiological Gene Center, Shanghai, ChinaShanghai Agrobiological Gene Center, Shanghai, ChinaShanghai Agrobiological Gene Center, Shanghai, ChinaShanghai Agrobiological Gene Center, Shanghai, ChinaMinistry of Agriculture and Rural Affairs (MARA) Key Laboratory of Crop Ecophysiology Farming System in the Middle Reaches of the Yangtze River, College of Plant Science Technology, Huazhong Agricultural University, Wuhan, ChinaThe application of nitrogen fertilizer within a normal range has been found to increase the leaf nitrogen content and photosynthetic rate of canola plants (Brassica napus L.). Despite numerous studies on the separate effects of CO2 diffusion limitation and nitrogen allocation trade-off on photosynthetic rate, few have examined both these factors in relation to the photosynthetic rate of canola. In this study, two genotypes of canola with varying leaf nitrogen content were analyzed to determine the impact of nitrogen supply on leaf photosynthesis, mesophyll conductance, and nitrogen partitioning. The results showed that the CO2 assimilation rate (A), mesophyll conductance (gm), and photosynthetic nitrogen content (Npsn) increased with an increase in nitrogen supply in both genotypes. The relationship between nitrogen content and A followed a linear-plateau regression, while A had linear relationships with both photosynthetic nitrogen content and gm, indicating that the key to enhancing A is increasing the distribution of leaf nitrogen into the photosynthetic apparatus and gm, rather than just increasing nitrogen content. Under high nitrogen treatment, the genotype (QZ) with high nitrogen content had 50.7% more nitrogen than the other genotype (ZY21), but had similar A, which was primarily due to ZY21’s higher photosynthetic nitrogen distribution ratio and stomatal conductance (gsw). On the other hand, QZ showed a higher A than ZY21 under low nitrogen treatment as QZ had higher Npsn and gm compared to ZY21. Our results indicate that, in selecting high PNUE rapeseed varieties, it is important to consider the higher photosynthetic nitrogen distribution ratio and CO2 diffusion conductance.https://www.frontiersin.org/articles/10.3389/fpls.2023.1171331/fullcanolagenotypephotosynthetic nitrogen use efficiencymesophyll conductanceN allocationphotosynthetic N |
| spellingShingle | Jiahuan Liu Kangkang Zhang Junguo Bi Xinqiao Yu Lijun Luo Liyong Hu Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply Frontiers in Plant Science canola genotype photosynthetic nitrogen use efficiency mesophyll conductance N allocation photosynthetic N |
| title | Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply |
| title_full | Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply |
| title_fullStr | Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply |
| title_full_unstemmed | Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply |
| title_short | Mesophyll conductance and N allocation co-explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply |
| title_sort | mesophyll conductance and n allocation co explained the variation in photosynthesis in two canola genotypes under contrasting nitrogen supply |
| topic | canola genotype photosynthetic nitrogen use efficiency mesophyll conductance N allocation photosynthetic N |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2023.1171331/full |
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