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Acta Agron Sin ›› 2007, Vol. 33 ›› Issue (04): 682-685.

• RESEARCH NOTES • Previous Articles     Next Articles

Characterization of Starch Accumulation and Activities of Enzymes Involved in Starch Synthesis in Grains of Wheat Cultivars Differing in Spike Types Field-Grown in Irrigation and Rainfed Conditions

DAI Zhong-Min12,WANG Zhen-Lin1,GAO Feng-Ju2,LI Wen-Yang1,YAN Su-Hui1,CAI Rui-Guo1,ZHANG Min1,YIN Yan-Ping1＊   

  1. 1 Agronomy College, Shandong Agricultural University /Key Laboratory of Wheat Cultivation Physiology and Genetic Improvement, Ministry of Agriculture / Shandong Provincial Key Laboratory of Crop Biology, Tai’an 271018, Shandong; 2Agricultural Sciences Research Institute of Dezhou City, Dezhou 253500, Shandong, China
  • Received:2006-05-29 Revised:1900-01-01 Online:2007-04-12 Published:2007-04-12
  • Contact: YIN Yan-Ping

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Abstract:

The study was carried out to characterize the starch accumulation and activities of some key enzymes in big-spike type cultivars, SN710331 and VM8, and poly-spike type cultivars, LM21 and JN17, under irrigated and rainfed conditions. Results showed that starch accumulation rate (SAR) and activities of SS, AGPase, SSS, GBSS, and SBE in big-spike type cultivars were significantly higher than those in poly-spike type cultivars. The soil water deficit led to the increases at early grain-filling period and decrease during late grain-filling, respectively, in SAR, accumulation duration and activities of the key enzymes above. Water deficit enhanced grain starch accumulation in poly-spike type cultivars. The simulation with Richards equation showed that starch accumulation duration and SAR determine the starch accumulation amount. The grains of big-spike type cultivars maintained longer filling duration, higher SAR and greater activities of related enzymes than those of poly-spike type cultivars during mid and late grain-filling.

Key words: Wheat (Triticum aestivum L.), Spike type, Starch synthesis, Irrigation, Rainfed cultivation

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