Effects of Maize Shading on Photosynthetic Characteristics, Vein and Stomatal Characteristics of Soybean
LI ShengLan, TAN TingTing, FAN YuanFang, YANG WenYu,, YANG Feng,College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture/Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130
Abstract 【Objective】 The aim of this study was to explore the effects of maize shading on the photosynthetic characteristics, leaf veins and stomatal characteristics of soybean during the symbiosis period under the maize-soybean intercropping system. 【Method】 Two factors were used in a completely randomized pot experiment under natural light, strong shade tolerant Nandou 12 and light shade tolerant Guixia 3, including the T1 (intercropping of 2 rows of maize and 2 rows of soybean), T2 (intercropping of 1 row of maize and 1 row of soybean) and CK (net for soybean) three treatments, respectively, to analyze photosynthetic parameters, veins and the porosity characteristic parameters’ responding under shading. 【Result】 By contrast with the net treatment, the far-red spectral irradiance of soybean canopy increased significantly under the shade of maize, and the light intensity under T1 and T2 treatment decreased by 48.62% and 77.39%, respectively. Photosynthetic rate, stomatal conductance, leaf vein density and stomatal density of soybean under maize shading were significantly less than those under CK (P<0.05), and the decrease rate increased with the increase of shade (from T1 to T2). Compared with CK, the net photosynthetic rate of Nandou 12 decreased significantly by 41.00% and 44.15% respectively under T1 and T2 treatment, the net photosynthetic rate of Guixia 3 decreased significantly by 44.62% and 47.93%, respectively, while stomatal conductance of Nandou 12 decreased significantly by 29.19% and 39.69%, and that of Guixia 3 decreased significantly by 26.83% and 49.50%, respectively. The vein density and stomatal density of Nandou 12 decreased by 14.99%, 20.01% and stomatal density decreased by 12.79%, 18.27% respectively under T1 and T2 treatment compared with CK; The vein density and stomatal density of Guixia 3 decreased by 10.38%, 27.62% and stomatal density decreased by 15.77%, 22.46% respectively under T1 and T2 treatment compared with CK. The net photosynthetic rate of soybean had significant positive correlation (P<0.05) with stomatal conductance, vein closure, stomatal density as well as vein density, and extremely negative correlation (P<0.01) with vein distance. In addition, there was an extremely significant positive correlation (P<0.01) between vein density and stomatal density. The vein density, vein length, veins closure, and the distance between the veins of Nandou 12 under maize shading were better than those of Guixia 3. In addition, the shade degree under T1 treatment was higher, while transpiration rate and vein closure, photosynthetic, vein and stomatal parameters of strong shade tolerant Nandou12 all change were less than those of Guixai 3, and Nandou had higher photosynthetic rate.【Conclusion】 In the maize-soybean intercropping system, the changes of canopy light environment, leaf vein and stomatal characteristics of soybean could reduce the photosynthetic ability of soybean, but the response of leaf vein and stomatal characteristics of different shade-tolerant soybean varieties to shading was different. Keywords:intercropping;soybean;photosynthetic characteristics;veins;stomatal
PDF (2276KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 李盛蓝, 谭婷婷, 范元芳, 杨文钰, 杨峰. 玉米荫蔽对大豆光合特性与叶脉、气孔特征的影响[J]. 中国农业科学, 2019, 52(21): 3782-3793 doi:10.3864/j.issn.0578-1752.2019.21.007 LI ShengLan, TAN TingTing, FAN YuanFang, YANG WenYu, YANG Feng. Effects of Maize Shading on Photosynthetic Characteristics, Vein and Stomatal Characteristics of Soybean[J]. Scientia Agricultura Sinica, 2019, 52(21): 3782-3793 doi:10.3864/j.issn.0578-1752.2019.21.007
A是9:00时的光谱辐照度;B是11:00时的光谱辐照度;C是13:00时的光谱辐照度;D是15:00时的光谱辐照度;E是17:00时的光谱辐照度;F是大豆冠层9:00到17:00的PPFD Fig. 1Spectral irradiance and PPFD of soybean canopy under monoculture and maize shading
A shows the spectral irradiance at 9:00; B shows the spectral irradiance at 11:00; C shows the spectral irradiance at 13:00; D shows the spectral irradiance at 15:00; E shows the spectral irradiance at 17:00; F shows the PPFD of the soybean canopy from 9:00 to 17:00
Table 1 表1 表1净作和玉米荫蔽下大豆叶片光合参数 Table 1Photosynthetic parameters of soybean leaves under monoculture and maize shading
品种 Variety
处理 Treatment
净光合速率 Pn (μmol·m-2·s-1)
气孔导度 Gs (μmol·m-2·s-1)
胞间CO2浓度 Ci (μmol·m-2·s-1)
蒸腾速率 Tr (g·m-2·h-1)
南豆12 Nandou 12
CK
27.93±0.82a
0.45±0.01a
243.00±6.53a
5.15±0.08b
T1
16.73±0.66b
0.32±0.02b
237.33±8.06a
6.16±0.27a
T2
15.60±0.99b
0.27±0.02c
251.67±20.17a
3.06±0.22c
桂夏3号 Guixia 3
CK
27.67±1.52a
0.43±0.02a
230.67±5.56a
4.40±0.14b
T1
15.10±1.49b
0.32±0.05b
209.00±36.51a
5.33±0.32a
T2
14.20±1.07b
0.22±0.02c
251.33±5.73a
2.78±0.05c
F
品种Variety
2.64
8.96
0.30
38.56**
处理Treatment
289.39**
84.23**
2.84
93.37**
品种×处理Variety×Treatment
1.78
1.36
5.11
2.01
Values followed by different lowercases within the same column are significantly different at 0.05 probability level. * means significant difference at 0.05 level,and ** means significant difference at 0.01 level. The same as below 同列不同小写字母表示0.05水平差异显著。*表示在0.05水平上差异显著,**表示在0.01水平上差异显著。下同
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