Abstract: The effects of roots-cutting in double ridge stage on the photosynthetic rate and later growth in two winter wheat varieties of different root systems were investigated. The results showed that both primary roots-cutting and partial adventitious roots-cutting increased the photosynthetic rate in the two winter wheat varieties. In dry land variety Jinmai 47 which had a little root system, primary roots-cutting treatment resulted in more significantly increased photosynthetic rate compared to the control than partial adventitious roots-cutt ing treatment. In winter wheat variety Shi 4185 which had a huge root system, removing of partial adventitious root led to a higher photosynthetic rate compared to the control than primary roots-cutting treatment. After the roots- cutting treatment, dry weight of root system, biomass above the ground,and yield of maturity were all reduced in both winter wheat varieties. Further more, yield of dry land variety Jinmai 47 was reduced, partial advent itious roots-cutting increased the yield of Shi 4185 while primary roots-cutting decreased its yield. Our study indicated that primary roots-cutting had a more significantly effect in winter wheat.

Key words: Roots-cutting, Double ridge stage, Photosynthetic rate, Water use efficiency, Winter wheat

CLC Number: 

• S512.1