Abstract
Despite global warming, the response of rice yield to long-term warming in cool regions and its physiological mechanisms remain unknown. This study used the widely cultivated japonica rice Jiyang100 in Northeast China. Taking rice grown under natural temperatures as a control (CK), field warming treatments were conducted at the tillering-panicle initiation (T1), whole growth (T2), and grain-filling (T3) stages. The positive effects of T1, T2, and T3 on the total number of spikelets per hole increased the yield in both years, with average increases of 11.5%, 9.9% and 6.5% compared to CK, respectively. Warming treatments improved the stay-green traits, photosynthesis, sucrose synthesis, and nitrogen metabolism of rice. The yield was positively correlated with the relative chlorophyll content (SPAD), soluble sugar content, sucrose content, and the activities of sucrose phosphate synthase (SPS), nitrate reductase (NR), glutamine synthetase (GS), glutamine oxoglutarate aminotransferase (GOGAT) in flag leaves. In addition, SPAD had a positive correlation with soluble sugar content, soluble protein content, and the activities of NR, GS, GOGAT, glutamate dehydrogenase (GDH), but a negative correlation with acid invertase (AI) activity. The stay-green ability was positively correlated to the net photosynthetic rate (Pn), soluble sugar content and soluble protein content. The coupling interactions of stay-green traits, nitrogen and carbon metabolism increased the yield potential and yield supply capacity, increased yield under long-term warming conditions in the cool regions. Under gradual warming, the physiological response of rice in cool regions promotes plant growth and development, thereby increasing yield.
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Abbreviations
- SPAD:
-
Relative chlorophyll content
- Pn :
-
Net photosynthetic rate
- SPS:
-
Sucrose phosphate synthase
- SS:
-
Sucrose synthase
- AI:
-
Acid invertase
- NR:
-
Nitrate reductase
- GS:
-
Glutamine synthetase
- GOGAT:
-
Glutamine oxoglutarate aminotransferase
- GDH:
-
Glutamate dehydrogenase
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This study was supported by an earmarked fund for the Jilin Provincial key research and development project (20230202009NC).
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Ma, K., Zhou, Y., Ma, Y. et al. Increased Rice Yield by Improving the Stay-green Traits and Related Physiological Metabolism under Long-term Warming in Cool Regions. Int. J. Plant Prod. 18, 175–186 (2024). https://doi.org/10.1007/s42106-024-00284-5
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DOI: https://doi.org/10.1007/s42106-024-00284-5