Effects of antimony stress on leaf anatomical structure of different clones of Catalpa bungei
Four concentrations of antimony stress were applied to 10 clones of Catalpa bungei in indoor pot,and the contentsof antimony were 0,600,1 200 and 2 000 mg·kg-1,respectively.The anatomical structure of leaves was observed by paraffin section method,and the effect of antimony stress on the anatomical structure of leaves of C.bungei was studied.The results showed that the antimony content in leaves of 10 C.bungei clones increased with the increase of antimony stress concentration under 0～2 000 mg·kg-1 antimony stress,except 2 clones No.2-8 and No.1-1 decreased under 2 000 mg·kg-1 antimony stress.Under different concentrations of antimony stress,the leaf thickness of 2 clones No.5-8 and No.0 showed no significant difference,and the other clones showed different changes with the increase of antimony stress concentration.As the concentration of antimony stress increases,the leaf thickness of different C.bungei clones shows different patterns of change.The thickness of upper epidermis and lower epidermis of leaves of 10 C.bungei clones presented a pattern of first increasing and then decreasing changes.Under different concentrations of antimony stress,there were some differences in leaf structure of 10 clones.In 600～2 000 mg·kg-1 antimony stress,average C.bungei clone grid ratio of fence tissue to sponge tissue was No.5-8(0.99)＞No.1(0.91)=No.2-8(0.91)＞No.0(0.90)＞No.5-2(0.89)＞No.8402(0.88)=No.72(0.88)＞No.1-1(0.86)=No.20-01(0.86)＞No.63(0.71).Under 0～2 000 mg·kg-1 antimony stress,antimony stress did not significantly damage the leaf structure of C.bungei clones,and showed a certain tolerance to antimony.
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