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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (04): 561-573.doi: 10.3724/SP.J.1006.2016.00561

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Ethylene-Chlormequat-Potassium on Characteristics of Leaf Senescence at Different Plant Positionsafter Anthesis under Different Planting Densities

LU Lin,DONG Zhi-Qiang*,DONG Xue-Rui,LI Guang-Yan   

  1. Institute of Crop Science, Chinese Academy of Agricultural Sciences / Key Laboratory of Crop Ecophysiology and Cultivation, Beijing 100081, China
  • Received:2015-07-13 Revised:2016-01-11 Online:2016-04-12 Published:2016-01-26
  • Contact: 董志强, E-mail: dongzhiqiang@caas.cn, Tel: 010-82106043 E-mail:932197016@qq.com
  • Supported by:

    This research was supported by the National Natural Science Foundation of China (31470087) and the National Key Technology R&D Program of China (2011BAD16B14, 2012BAD04B01).

Abstract:

In order to explore the effects of ethylene-chlormequat-potassium(ECK) on leaf aging and early senescence in summer maize, and provide a theoretical basis for high and stable yields of summer maize under high planting density by chemical regulation technology in North China Plain,a field experimentwas conducted using two types of maize hybrids (Zhongdan909 and Xundan20)with treatments of ethylene-chlormequat-potassium under different planting densities. The results showed that the increased planting density significantly decreased leaf area (LA) per plant and increased LA reduction rate. With the increase of planting density decreased SPAD value, soluble protein content, and activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) of ear leaf, the third leaf above ear, and the third leaf below ear,while malondialdehyde (MDA) content increased. The above indexes had differences among varieties andleaf positions. ECK treatment significantly increased activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), SPAD value and soluble protein content in leaves at different positions, decreased LA reduction rate, delayedand alleviatedleaf senescence. Under the density of ≥7.5×104 plant ha-1, the yield of Zhongdan909 and Xundan20, compared with their own controls, increased by 5.59%−6.63% and 6.73%−8.10%, respectively. ECK treatment significantly prevented early senescence under higher planting densities, therefore increased yield. Thus, adopting an appropriate planting density combined with ECK application could be an important technique for achieving high grain yield in summer maize production in North China Plain.

Key words: Summer maize, Ethylene-Chlormequat-Potassium, Planting density, Leaf senescence, Antioxidant enzyme

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