光照强度对苗期大豆叶片气孔特性及光合特性的影响

doi:10.3864/j.issn.0578-1752.2019.21.006

Abstract

Abstract:

【Objective】 To reveal the response mechanism of photosynthetic and stomatal characteristics of soybean leaves to shade, it analyzed the stomatal characteristics, photosynthesis and carbohydrate changes of soybean leaves in seedling stage under different light intensity. 【Method】 A pot experiment was conducted to analyze the impact of four light-intensity levels including CK (normal light), LS (light shading, 20% shading), MS (medium shading, 40% shading) and SS (severe shading treatment, 75% shading) on stomata characteristics of upper and lower epidermis, photosynthetic fluorescence parameters, soluble sugar and starch content of two soybean varieties (Nandou-12, weak shade-sensitive and Guixiadou-7, high shade-sensitive).【Result】 Results revealed that the maximum number of stomata on the upper and lower epidermis of soybean leaves was observed with Nandou-12. Among shading treatments, LS and MS treatments significantly increased the number of stomata on the upper (by 26.9% and 18.5%) and lower (by 13.9% and 39.2%) epidermis as compared with CK. And between soybean varieties, the highest rate of photosynthesis was measured under LS treatment, whose average was 14.33 μmol CO₂·m ^-2·s ^-1. In addition, the highest values of stomatal conductance in Nandou-12 (0.57 mm·m ^-2·s ^-1) and Guixiadou-7 (0.30 mm·m ^-2·s ^-1) were measured under LS treatment, and the maximum concentration of carbon dioxide under LS and SS treatments with Nandou-12 was significantly higher than that under CK. These results implied that increasing light intensity decreased the actual quantum yield, however, the actual quantum yield of Nandou-12 was significantly higher than that of Guixiadou-7. In contrast, the non-photochemical quenching coefficient of Nandou-12 and Guixiadou-7 was enhanced with a decline in light intensity. Moreover, the starch content of Nandou-12 and Guixiadou-7 was decreased by 59.0%, 77.8%, and 95.8%, and 47.5%, 67.3%, and 87.8%, respectively, under LS, MS, and SS treatments. Whereas, light shading (LS) significantly increased (72.7%) the soluble sugar content of Nandou-12 as compared with the corresponding values of Guixiadou-7.【Conclusion】 Overall, our results confirmed that shading conditions directly affect the stomata and photosynthetic characteristics of soybean leaves. However, by maintaining appropriate shading, the net photosynthetic rate of soybean leaves could be increased by increasing the rate of stomatal opening, which was conducive to increase the accumulation of carbohydrates and thus enhance the shade resistance of soybeans.

Key words: soybean, shade, stoma characteristics, photosynthetic characteristics, carbohydrate

CHEN JiYu,FENG LingYang,GAO Jing,SHI JianYi,ZHOU YuChen,TU FaTao,CHEN YuanKai,YANG WenYu,YANG Feng. Influence of Light Intensity on Stoma and Photosynthetic Characteristics of Soybean Leaves[J].Scientia Agricultura Sinica, 2019, 52(21): 3773-3781.

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References 40

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处理 Treatment	荫蔽程度 Shading level	光照强度 Light intensity (μmol·m^-2·s^-1)	红光/ 远红光比值 Red/Far-red
CK	正常光照 (Normal light)	400±3.6	3.8±0.2
LS	遮光20% (20% shading)	320±1.8	3.9±0.3
MS	遮光40% (40% shading)	240±2.9	3.8±0.2
SS	遮光75% (75% shading)	100±1.5	3.9±0.4

处理 Treatment	净光合速率 Pn (μmol CO₂·m^-2·s^-1)		气孔导度 Gs (mm·m^-2·s^-1)		胞间二氧化碳浓度 Ci (μmol)		蒸腾速率 Tr (g·m^-2·h^-1)
处理 Treatment	南豆12 Nandou12	桂夏豆7号 Guixiadou7	南豆12 Nandou12	桂夏豆7号 Guixiadou7	南豆12 Nandou12	桂夏豆7号 Guixiadou7	南豆12 Nandou12	桂夏豆7号 Guixiadou7
CK	12.25±1.71b	10.08±1.14c	0.18±0.04cd	0.16±0.01d	424.66±10.08d	438.21±12.17c	2.10±0.42c	1.98±0.08cd
LS	14.12±1.20a	14.54±0.50a	0.57±0.31a	0.30±0.04bc	449.65±18.87b	425.31±2.98d	4.18±1.37a	2.92±0.24b
MS	12.29±1.16b	11.96±0.29b	0.16±0.02d	0.20±0.04c	370.37±3.61e	433.35±2.08cd	1.98±0.22cd	3.79±0.17a
SS	10.49±0.15c	5.82±1.47d	0.39±0.02b	0.11±0.04d	500.23±2.53a	450.47±7.98b	3.68±0.13a	1.39±0.45d

Influence of Light Intensity on Stoma and Photosynthetic Characteristics of Soybean Leaves

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