Welcome to Acta Agronomica Sinica,

Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (05): 942-949.doi: 10.3724/SP.J.1006.2014.00942

• RESEARCH NOTES • Previous Articles    

Effects of Postponed Application of Nitrogen Fertilizer on Yield and Physiological Characteristics of Flag Leaf in Wheat under Post-Anthesis Heat Stress

JIANG Wen-Wen,YIN Yan-Ping*,WANG Zhen-Lin*,LI Yong,YANG Wei-Bing,PENG Dian-Liang,YANG Dong-Qing,CUI Zheng-Yong,LU Kun-Li,LI Yan-Xia   

  1. Agronomy College, Shandong Agricultural University / State Key Laboratory of Crop Biology, Tai’an 271018, China?
  • Received:2013-10-16 Revised:2014-01-12 Online:2014-05-12 Published:2014-02-17
  • Contact: 尹燕枰, E-mail: ypyin@sdau.edu.cn, Tel: 0538-8242458; 王振林, E-mail: zlwang@sdau.edu.cn, Tel: 0538-8241359

Abstract:

This study aimed to disclose the effect and physiological basis of postponed application of nitrogen fertilizer on alleviating the high-temperature damage after anthesis. In a two-year experiment from October 2011 to June 2013, winter wheat (Triticum aestivum L.) cultivars Shannong 16 and Jimai 22 were planted with three nitrogen treatments, namely T0 (total as basal fertilizer), T1 (a half of basal fertilizer and a half of nitrogen applied at jointing stage), and T2 (a half of basal fertilizer and a half applied at booting stage). High-temperature stress was simulated in plastic shed from 11 to 15 days after anthesis. Grain yield and its components, photosynthetic parameters of flag leaf, and activities of some important enzymes were compared among nitrogen treatments. The results indicated that T2 had higher 1000-grain weight and grain yield than T0 and T1 under heat stress. Besides, T2 had the effects on increasing glutamine synthetase (GS) activity, stomatal conductance, photosynthetic rate, and activities of hydrogen peroxidase (CAT) and peroxidase (POD) in flag leaf, stimulating translocation of pre-anthesis assimilate to grains, and increasing the contribution to grain of post-anthesis assimilate. Both cultivars had similar results. In an overall view, T2 is superior to T0 and T1 due to its significant effects on alleviating heat stress damage and increasing grain yield.

Key words: Wheat, Flag leaf, Heat stress, Postponed application of nitrogen fertilizer, Grain yield

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