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Optimal NH4+/NO3− ratios enhance the shade tolerance of soybean seedlings under low light conditions
Plant Biology ( IF 4.2 ) Pub Date : 2020-11-20 , DOI: 10.1111/plb.13219 A Raza 1, 2 , M A Asghar 3 , S Hussain 1, 2 , C Bin 1, 2 , I Shafiq 1, 2 , I Ahmad 1, 2 , A Ghafoor 2 , H Karim 4 , T Iqbal 5 , W Yang 1, 2 , L Weiguo 1, 2
中文翻译：
最佳 NH4+/NO3− 比例可增强弱光条件下大豆幼苗的耐荫性
更新日期：2020-11-20
Plant Biology ( IF 4.2 ) Pub Date : 2020-11-20 , DOI: 10.1111/plb.13219 A Raza 1, 2 , M A Asghar 3 , S Hussain 1, 2 , C Bin 1, 2 , I Shafiq 1, 2 , I Ahmad 1, 2 , A Ghafoor 2 , H Karim 4 , T Iqbal 5 , W Yang 1, 2 , L Weiguo 1, 2
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- In the maize–soybean intercropping system, shade is the major chronic restraint that affects normal growth of soybean. Different spatial patterns of this system affect the microclimate of soybean through shading from maize plants. However, the negative impacts of shading stress can be mitigated by providing optimal ratios of different fertilizers.
- Therefore, to test this hypothesis, soybean plants were grown under different light conditions (normal light or shade) to evaluate the response to varying NH4+/NO3− ratios. Seeds of soybean (Glycine max L. cv. Nan‐99‐6) were grown in nutrient solution with a total concentration of 5 mM N using different NH4+/NO3− ratios (T0 = 0:0, T1 = 0:100, T2 = 25:75, T3 = 50:50 and T4 = 75:25) for 40 days in a greenhouse at PPFD 320.95 μmol m−2 s−1 (low light) or 967.53 μmol m−2 s−1 (normal light).
- Under low light, growth and photosynthesis of soybean seedlings significantly decreased as compared to normal light conditions. However, the optimal ratios of NH4+/ NO3− improved growth and photosynthesis of soybean seedlings under both light conditions. Our results indicated that soybean seedlings supplied with optimal NH4+/NO3− ratios (25:75 and 50:50) have maximum biomass yield, chlorophyll pigments, leaf gas exchange, photochemical activity and root growth as compared to low and high NH4+/NO3− ratios (T1 and T4).
- High ratios of NH4+/NO3− (T4) resulted in reduced plant growth due to nutrient accumulation in plant tissues; therefore, we suggest that optimal ratios of NH4+/NO3− (T2 and T3) can enhance the shade tolerance of soybean seedlings.
中文翻译：
最佳 NH4+/NO3− 比例可增强弱光条件下大豆幼苗的耐荫性
在玉米-大豆间作系统中，遮荫是影响大豆正常生长的主要长期制约因素。该系统的不同空间格局通过玉米植物的遮荫影响大豆的小气候。然而，可以通过提供不同肥料的最佳比例来减轻遮荫压力的负面影响。
因此，为了检验这一假设，大豆植物在不同的光照条件（正常光照或阴影）下生长，以评估对不同NH 4 + /NO 3 -比率的响应。大豆种子 ( Glycine max L. cv. Nan-99-6) 在总浓度为 5 mM N 的营养液中生长，使用不同的 NH 4 + /NO 3 -比例（T 0 = 0:0，T 1 = 0:100、T 2 = 25:75、T 3 = 50:50 和 T 4 = 75:25）在温室中 PPFD 320.95 μmol m −2 s −1 （弱光）或 967.53 μmol m − 40 天2 s -1 （正常光）。
弱光条件下，大豆幼苗的生长和光合作用较正常光照条件显着下降。然而，NH 4 + / NO 3 -的最佳比例在两种光照条件下均改善了大豆幼苗的生长和光合作用。我们的结果表明，与低和高 NH 相比，提供最佳 NH 4 + /NO 3 -比例（25:75 和 50:50）的大豆幼苗具有最大的生物量产量、叶绿素色素、叶气体交换、光化学活性和根系生长4 + /NO 3 -比率（T 1和T 4 ）。
高比例的NH 4 + /NO 3 - (T 4 ) 由于植物组织中养分的积累而导致植物生长减缓；因此，我们建议NH 4 + /NO 3 - (T 2和T 3 )的最佳比例可以增强大豆幼苗的耐荫性。
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