Welcome to Acta Agronomica Sinica,

Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (09): 1698-1709.doi: 10.3724/SP.J.1006.2012.01698


Effect of PASP-KT-NAA on Leaf Senescence and Grain Filling Rate during the Grain-Filling Period in Different Temperature Zones

XU Tian-Jun,DONG Zhi-Qiang*,GAO Jiao,CHEN Chuan-Xiao,JIAO Liu,XIE Zhen-Xing   

  1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/ Key Laboratory of Crop Eco-physiology and Cultivation, Beijing 100081, China
  • Received:2012-02-24 Revised:2012-06-06 Online:2012-09-12 Published:2012-07-03
  • Contact: 董志强, E-mail: dongzhiqiang@126.com, Tel: 010-82106043

Abstract: Field experiment was performed to investigate the effects of the chemical regulation of PASP-KT-NAA (PKN) on leaf senescence physiology and grain filling rate under different temperatures. The result showed that the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), chlorophyll concentration in ear leaves of two maize cultivars were declined, while malondialdehyde (MDA) content increased in three accumulate temperature zones with low temperature. In the same accumulated temperature zone, and in process of growth, SOD, POD, CAT activities showed the trend of a single peak curve with “first increase and then decrease”, and MDA content showed an opposite trend. PKN treatment increased SOD, POD, CAT activities and chlorophyll contents of ear leaves, while declined MDA content in ear leaves of Zhengdan 958 and Fengdan 3. From the first accumulated temperature zone to the third accumulated temperature zone, the grain weight of two maize cultivars show a S-shape increase in the “low-fast-low” type and the grain filling rate showed an “increased and then declined” trend. The grain weight and the grain filling rate of the first accumulated temperature zone were higher than those of the second and the third accumulated temperature zones. PKN treatment had higher grain weight and the grain filling rate compared with the control. In 2010 and 2011, the yield of two varieties of maize increased in the PKN treatment. The yield of Zhengdan 958 and Fengdan 3 in the third accumulated temperature zone was 2.58%, 1.17% and 2.04%, 1.48% higher than that in the first and second accumulated temperature zones, in 2010 and 8.2%, 5.1% and 3.4%, 0.8% higher than that in the first and second accumulated temperature zones in 2011. Thus, the chemical regulation in proved to have contributions to delaying the leaf senescence, improving the grain filling rate, and ultimately increasing the yield in maize.

Key words: Accumulated temperature zone, Grain-filling period, Leaf senescence, Grain filling rate, PKN

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