| An experiment was carried out in winter wheat northward test base, Shenyang Agricultural University from 2007 to 2008. Breed selection of this group of P12, 138, M808 winter wheats varieties (lines). Seeds of drought-resistance tests conducted in the laboratory, through the determination of seed and seedling drought indicators of physiological indicators of drought compared P12, 138 and M808. Field experiments were set up to four irrigation treatments, respectively, do not water the whole growth period, irrigation winter time, the first irrigation at jointing stage, jointing stage and pick the flag of the irrigation period, Volume of water per 1m3, growth and development of winter wheat and physiological measurement, draw water for different drought resistance winter wheat and its laws. The main results were summarized as follow:Reduce the relative water abstraction of seeds under drought stress, parabola changes, the rate of reducing is 138>P12>M808. Seed germination rate and germination energy were significantly lower under 20%PEG-6000 treatment, the rate of reducing is P12>138>M808. Dry matter transport rate reduce M808>138>P12. Comprehensive analysis of seed germination rate, germination energy and dry matter transport rate such as drought indicators, under drought stress, drought resistance of the weak to the strong order of M808>P12>138.MDA content in leaves increased significantly of P12, higher than the CK 10.67%, M808 higher than the 1.52% in CK. Leaves the highest activity of POD, increased the most, ability to protect the most of M808. P12 and an increase of almost 138 of SOD activity, M808 is the highest. Comprehensive analysis the drought indicators under drought stress, drought resistance of the weak to the strong order is M808>P12>138.The plant height of winter wheat were the highest in the T3 treatment, T0 relative height increases P12 (9.15%) maximum. All varieties (lines) of the largest stem width under T2 treatment. Irrigation treatments on the SPAD of 138 the smallest change under T3 treatment. Trends of flag leaves net photosynthetic rate, transpiration rate, stomatal conductance is T3>T1>T2>T0, but trends of flag leaf intercellular CO2 concentration is T3 |
PDF Full Text Request