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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (09): 1596-1604.doi: 10.3724/SP.J.1006.2010.01596

• RESEARCH ACTIVITIES • Previous Articles     Next Articles

Difference of Endogenous Hormones in Leaves between Main Stem and Tillers and Its Effect on Spike Formation in Large Spike Winter Wheat Cultivar LanKao Aizao 8 under Different Plant Densities

XU Li-Na1,2,FENG Wei1,**,SHENG Kun1,3,ZHU Yun-Ji1,MA Dong-Yun1,GUO Tian-Cai1,*   

  1. 1 National Engineering Research Center for Wheat/Henan Agricultural University, Zhengzhou 450002, China; 2 College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; 3 Xinxiang Academy of Agricultural Sciences, Xinxiang 453000, China
  • Received:2009-12-29 Revised:2010-04-21 Online:2010-09-12 Published:2010-07-05
  • Contact: GUO Tian-Cai,E-mail:tcguo888@sina.com; Tel: 0371-63558201

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Abstract: Contents of indoleacetic acid (IAA), zeatin riboside (ZR), and abscisic acid (ABA) were determined in the first fully expanded leaves of the first and the second tillers, and the main stem of Lankao Aizao 8 under different planting densities. The contents of IAA and ZR were higher in the main stem than in tillers, and the content of ABA was higher in tillers than in the main stem. The time of initiated increasing for content differences between the main stem and tillers was since early jointing stage for IAA and ZR and 6 to 12 d later for ABA. These differences on hormone contents enhanced with the growing of planting density, leading to senescence of tillers ultimately. Compare with single hormone content, the balance of endogeneous hormones was more important for the formation of spike in tillers. The leaf ZR/ABA value and tiller/stem ratio for IAA/ABA and ZR/ABA made the judgment for the critical period of tiller senescence and development advanced to double-ridge telophase, and 6 to 22 d earlier than that based on single hormone content.

Key words: Winter wheat, Large spike-type, Endogenous hormones, hormone balance, Formation of spike in tillers

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