Abstract:
Under soil water stress,osmotic adjustment ability of wheat cultivars with strong drought resistant was 0.41MPa-0.60MPa stronger than that of wheat cultivars with weak drought resistant.Dropping percentage of rilative water content and dropping value of water potential were 6.39-10.74 percentage point and 0.19MPa-0.63MPa less than that of weak drought resistant cultivars.Meanwhile,Photosynthetic capacity was inhibited under soil water stress.However,the degree of inhibition of photosynthetic rate and stomatal conductance of strong drought resistant cultivars were 17.7%-22.5% and 21.06%-23.75% less than that of weak drought resistant cultivars,respectively.Ultrastructure changes of wheat mesophyll cell chloroplast F2 cultivars were examined under soil water stress.The more severe the soil water stress was,the greater the changes of chloroplast ultrastructure were.The changes were negative correlation with cultivars'drought resistant and osmotic adjustment ability.The morphology of chloroplast under soil water stress changed into circlar.Thylakoid of chloroplast became swollen,matrix lamella became obscure,ultimately,the chloroplast were disintegrated.
Key words:
Soil water stress,
Osmotic adjustment in winter wheat leaf,
Chloroplast ultrastructure
CLC Number:
WU Yuye, LI Dequan. Effects of Soil Water Stress on Osmotic Adjustment and Chloroplast Ultrastructure of Winter Wheat Leaves[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2001, 16(2): 87-93. doi: 10.3321/j.issn:1000-7091.2001.02.017.