Journal
FRONTIERS IN PLANT SCIENCE
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2022.906537
Keywords
soybean; shade stress; NH4+; NO3-; lignin enzymes; stem lodging resistance
Categories
Funding
- National Key Research and Development Program of China [2018YFD1000905]
- Sichuan Innovation Team Project of National Modern Agricultural Industry Technology System [SCCXTD-2020-20]
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The study showed that, under shade conditions, the optimum NH4+/NO3- ratios can enhance the lodging resistance of soybean stem by improving photosynthetic activity, biomass accumulation, carbohydrate content, and lignin-related enzyme activity.
Shading is one of the most chronic restrains which can lead to the lodging of intercropped plants. In order to increase the soybean stem lodging resistance, a 2-year field trial was conducted to evaluate the impact of different ratios and concentrations of NH4+/NO3- on the morpho-physiological and biochemical characteristics of soybean stem under shade conditions. The total 5 ratios of NH4+/NO3- were applied as follows: T0 = 0/0 (control), T1 = 0/100 (higher ratio), T2 = 25/75 (optimum), T3 = 50/50 (optimum), and T4 = 75/25 (higher ratio) as a nitrogen source. Our findings displayed that the T2 (25/75) and T3 (50/50) treatments alleviated the shading stress by improving the photosynthetic activity, biomass accumulation, carbohydrates contents, and lignin related enzymes (POD, CAD, and 4Cl) which led to improvement in stem lodging resistance. The correlation analysis (p <= 0.05, p <= 0.01) revealed the strong relationship between lodging resistance index and stem diameter, stem strength, lignin content, photosynthesis, and lignin related enzymes (POD, CAD, and 4CL) evidencing the strong contribution of lignin and its related enzymes in the improvement of lodging resistance of soybean stem under shade conditions. Collectively, we concluded that optimum NH4+/NO3- ratios (T2 and T3) can boost up the lodging resistance of soybean stem under shade stress.
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