作物学报2016，Vol.42Issue(4)：561-573,13.DOI:10.3724/SP.J.1006.2016.00561
乙矮合剂对不同密度夏玉米花粒期不同部位叶片衰老特性的影响
Effects of Ethylene-Chlormequat-Potassium on Characteristics of Leaf Senes-cence at Different Plant Positions after Anthesis under Different Planting Den-sities
摘要
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 regula-tion technology in North China Plain, a field experiment was conducted using two types of maize hybrids (Zhongdan 909 and Xundan 20) 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 in-creased. The above indexes had differences among varieties and leaf 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, delayed and alleviated leaf senescence. Under the density of≥7.5×104 plant ha–1, the yield of Zhongdan 909 and Xundan 20, 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.关键词
夏玉米/乙矮合剂/种植密度/叶片衰老/抗氧化酶Key words
Summer maize/Ethylene-chlormequat-potassium/Planting density/Leaf senescence/Antioxidant enzyme引用本文复制引用
卢霖,董志强,董学瑞,李光彦..乙矮合剂对不同密度夏玉米花粒期不同部位叶片衰老特性的影响[J].作物学报,2016,42(4):561-573,13.基金项目
本研究由国家自然科学基金项目(31470087)和国家粮食丰产科技工程项目(2011BAD16B14,2012BAD04B01)资助。This study was supported by the National Natural Science Foundation of China (31470087) and the National Key Technology R&D Program of China (2011BAD16B14,2012BAD04B01) （31470087）
