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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (10): 1920-1929.doi: 10.3724/SP.J.1006.2012.01920

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Differences of Starch Granules in Grains from Different Spikelet Positions and Their Correlation with Grain Weight in Winter Wheat

TAN Xiu-Shan1,3,BI Jian-Jie2,3,WANG Jin-Hua1,3,YE Bao-Xing1,3,*   

  1. 1 College of Life Science of Shandong Agricultural University, Tai’an 271018, China; 2 Agronomy College of Shandong Agricultural University, Tai’an 271018, China; 3 State Key Laboratory of Crop Biology, Tai’an 271018, China
  • Received:2012-03-21 Revised:2012-07-10 Online:2012-10-12 Published:2012-07-27
  • Contact: 叶宝兴, E-mail: yeb@sdau.edu.cn, Tel: 0538-8242561

Abstract:

The purpose of this study was to reveal the differences in development and size-distribution of starch granules in endosperm of wheat grains in different grain positions and spikelet positions. The endosperm cell size, and the number, volume and surface area distribution of starch granules in mature caryopsis, as well as the changes of starch granule number during endosperm development, were studied using wheat cultivar Jimai 20 grown in the field. The results showed that the development of starch granule was closely related with grain position and spikelet position. In the same spikelet position, starch grains formed 4–5 d earlier in superior grains (the first and the second grains) than in inferior grains (the third and the fourth grains).At the same grain position, starch granules developed first in the grains of the middle spikelets, and then in grains of upper and lower spikelets. The amount of starch granules was the highest in the middle spikelet grains all the time. The lower spikelet grains had the least starch granules at the beginning of grain filling, however, the number of starch granules increased gradually and surpassed that of the upper spikelet grainsas caryopsis matured. Correlation coefficients between grain weight and starch granule amount became more significant with grain filling, which reached 0.88** (large starch granule) and 0.78** (small starch granule) at mature stage. Correlation coefficients between grain weight and large starch granule amount were higher than 0.96**, and had no difference among different spikelet positions. Correlation coefficients between grain weight and small starch granule amount were higher than 0.93**, and had a trend of upper > lower > middle in different spikelet positions. The trend of size distribution was BL-type > BS-type > A-type. There were more BS-type granules in superior grains than in inferior grains. The number of BS-type granules increased with the spikelet position rising, whereas the number of BL-type granules showed a reverse trend. The size distribution of starch granules had similar changes to volume and surface area. The formation and size distribution of starch granules were affected significantly by grain position and spikelet position, and inferior grains had the potential of increasing grain weight through increasing the quantity of starch granules.

Key words: Winter wheat, Spikelet position, Endosperm, Starch, Size distribution

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