关键词:春玉米; 乙矮合剂; 聚糠萘合剂; 蔗糖; 蔗糖代谢关键酶 Effect of Plant Growth Regulators on Key Enzymes in Sucrose Metabolism of Ear Leaf and Grain at Filling Stage of Spring Maize LI Guang-Yan, WANG Qing-Yan, XU Yan-Li, LU Lin, Jiao Liu, DONG Xue-Rui, DONG Zhi-Qiang* Institute of Crop Science, Chinese Academy of Agricultural Sciences / Key Laboratory of Crop Ecophysiology and Cultivation, Beijing 100081, China Fund:This study was supported by the National Natural Science Foundation of China (31470087), the National Key Technology R&D Program of China (2012BAD04B01-07, 2012BAD4B02) and Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences AbstractIn order to explore the new cultivation techniques, chemical control was established in this study. We conducted a field experiment using two varieties of Zhongdan 909 and Jidan 35 with treatments of leaf-spraying ethylene-chlormequat-potassium (ECK) in V6 and PASP-KT-NAA (PKN) in V9. The results showed that ECK & PKN increased the activities of sucrose synthetase (SS) and sucrose phosphate synthetase (SPS) and sucrose content during early grain filling stage (10-20 d after anthesis) in ear leaf, and decreased sucrose content in ear leaf during late grain filling stages (30-50 d after anthesis), especially it improved the ability of sucrose synthesis at the late filling stage (50 d after anthesis). ECK & PKN also decreased SS (synthesis) activity in grain during middle and late grain filling stages and increased SS (resolving) activity, promoting sucrose decomposition ability, with less effect on SS (synthesis) and SPS activities in grain. The yields of Zhongdan 909 and Jidan 35 compared with their own control were respectively increased by 4.61% and 7.78%. The study indicated that ECK & PKN enhance sucrose synthesis in leaf and decomposition ability in grain, and promote the translocation of carbon assimilation to grain, resulting in high grain-filling rate, high grain weight, and high yield.
Keyword:Spring maize; ECK; PKN; Sucrose; Key enzymes of sucrose metabolism Show Figures Show Figures
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