Scientia Agricultura Sinica ›› 2018, Vol. 51 ›› Issue (7): 1272-1282.doi: 10.3864/j.issn.0578-1752.2018.07.005

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effects of Intercropping on the Transformation of Carbohydrate Related Substances in Stem of Soybean Seedling Stage and Its Relationship with Leaf Photosynthesis

REN ShengMao1, 2, DENG YuChuan1, 2, WEN FengJun2, Sajad Hussain1, Pu QuanMing2, YU XiaoBo2, LIU WeiGuo1, YANG WenYu1   

  1. 1College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu 611130; 2Nanchong Academy of Agriculture Sciences, Nanchong 637000, Sichuan
  • Received:2017-08-25 Online:2018-04-01 Published:2018-04-01

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Abstract: 【Objective】The purpose of this study was to clarify the mechanism of photosynthetic morphology of soybean at seedling stage in maize/soybean intercropping from the perspective of transformation of related sugars and cellulose synthesis.【Method】 Under soybean monoculture and maize/soybean intercropping systems, the strong shade tolerant soybean (Nandou12) and weak shade tolerant soybean (Nan 032-4) were used as the experimental materials. The photosynthetic rate of leaf and the total carbon, cellulose, soluble sugar, sucrose, and β-1, 3-glucan of stem were measured and analyzed. 【Result】 Compared with soybean monoculture, the leaf photosynthetic rate of intercropping soybean was significantly decreased due to maize shading, but the degree of response was different with different soybean cultivar. In intercropping system, the decreasing degree of strong shade tolerance soybean Nandou 12 was relatively small, and Nandou 12 showed stronger photosynthetic ability than Nan 032-4. The total carbon contents in the leaf and stem of shaded soybean decreased, but the reduction degree of Nandou12 was significantly lower than that of Nan 032-4. Correlation analysis showed that the photosynthetic rate of leaf was highly significantly positive correlation with the total carbon content in the leaf and stem, and the cellulose content in the stem (r=0.952, 0.935, 0.825, respectively, P＜0.01). The result explained that shade of intercropping affected the photosynthesis rate, reduced the accumulation and distribution of photosynthetic products in the stem. Finally, the cellulose content in soybean stem was decrease. But the strong shade tolerance soybean Nandou 12, with the higher photosynthetic rate and accumulation of photosynthetic product, was more suitable planting in intercropping. At seedling stage, the soluble sugar content of intercropping soybean stem was significantly lower than that of monoculture soybean. The contents of β-1, 3-glucan and sucrose in intercropped soybean stem from 30-51 d after germinating were significantly higher than that in monoculture, and in intercropping the carbohydrate conversion rate of two soybean was significantly different. Under the same planting pattern, the content and transformation rate of soluble sugar, sucrose and β-1,3-glucan of soybean stem with strong shade tolerance soybean Nandou 12 were significantly higher than those in Nan 032-4. The analysis of cellulose deposition modes showed that, for the same soybean material, the rapid accumulation time and accumulation rate in monoculture system were higher than that in intercropping system. In the same planting pattern, the cellulose accumulated rate in the stem of Nandou 12 was shorter than that of Nan 032-4, but the difference was small, and the accumulation rate was higher than that in Nan 032-4. It resulted in that the cellulose content in the stem of Nandou12 was significantly higher than that in Nan 032-4.【Conclusion】Shading from maize in intercropping system decreases the photosynthetic capacity of soybean leaves, slow the transportation of photosynthate from leaf to stem, and reduce content of stuffing in stem stuffing. Shading changes the accumulation modes of cellulose in soybean stem, and makes the cellulose content decrease. In intercropping system, the strong shade tolerance soybean Nandou12 can maintain higher photosynthetic capacity and stronger cellulose synthesis ability in the stem, so its’ lodging resistance is strong.

Key words: intercropping soybean, photosynthetic rate, total carbon, cellulose, soluble sugar, sucrose, β-1, 3- glucan

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