Chin J Plant Ecol ›› 2010, Vol. 34 ›› Issue (4): 444-451.DOI: 10.3773/j.issn.1005-264x.2010.04.010

• Research Articles • Previous Articles     Next Articles

Evolvement of harvest index and water-use efficiency in diploid, tetraploid and hexaploid wheats during grain-filling stage under different water treatments

ZHAO Zi-Ping*(), DENG Xi-Ping**(), WANG Zheng-Hong, LIU Bin-Bin   

  1. State Key Laboratory of Soil Erosion and Dryland Farming on LoeSD Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China
  • Received:2008-12-15 Accepted:2009-11-03 Online:2010-12-15 Published:2010-04-01
  • Contact: DENG Xi-Ping


Aim Our objective was to understand differences in grain yield and water-use efficiency among wheats of different ploidy.

Methods We conducted experiments on six wheat varieties: diploid species (Triticum boeoticum, T. monococcum), tetraploid species (T. dicoccoides, T. dicoccon) and hexaploid species (T. aestivum Changwu 134 and Shaan 253). These were treated with different water conditions in the grain-filling stage, and we determined root biomaSD, aboveground biomaSD, grain yield, water consumption for transpiration and water-use efficiency.

Important findings There were significant differences in biomaSD, grain yield and water-use efficiency among different wheat varieties with different diploid chromosomes under each water treatment. In the evolution of wheat from diploid to hexaploid, dry weight of root system increased first and then decreased; aboveground biomaSD, 1 000-kernel weight, grain number per spike, grain yield, harvest index and water-use efficiency increased gradually. With the aggravation of drought, harvest index of wheat increased first and then decreased; values of harvest index were 41.26%, 42.28% and 38.19%, respectively. Water-use efficiency for biomaSD gradually increased; values were 2.39, 2.43 and 2.53 g·kg-1, respectively. Values for water-use efficiency for grain yield were 1.05, 1.10 and 1.04 g·kg-1, respectively. Therefore, water condition was a key factor influencing harvest index and water-use efficiency during grain-filling stage, and moderate water streSD is helpful to improve water-use efficiency for crops. Water deficit during the grain-filling stage could improve the harvest index of hexaploid wheat as well as biomaSD water-use efficiency of tetraploid wheat, and moderate water deficit may increase yield water-use efficiency of both tetraploid and hexaploid wheat.

Key words: grain-filling stage, grain yield, harvest index, water deficit, water-use efficiency, wheat of different ploidy