Physiological Response of Two Cotton Seedlings to Cadmium Stress Treated with Different Concentrations of Manganese

doi:10.7668/hbnxb.20194143

Abstract

Abstract:

To investigate the effects of Mn treatment on the growth,development and cadmium adsorption capacity of cotton under Cd stress.Different concentrations of Mn treatment(0,5,10,50 μmol/L)were applied to exploit changes of superoxide dismutase(SOD),catalase(CAT),malondialdehyde(MDA),free proline(Pro),Cd content,dry matter quality,and main root length of roots of cotton seedlings of Xiang C178 and Xiang FZ001 under Cd stress.The stress of 10 μmol/L Cd had a significant effect on the growth of cotton root.The physical barrier and antioxidant defense mechanism were constructed to reduce the damage of Cd to root cells,resulting in a decrease in SOD activity and an increase in CAT activity,MDA content and Pro content.And, adding Mn was observed to effect the physiological response to cadmium of cotton seedling roots. Low concentration of Mn treatment resulted in the decrease of Cd content,the increase in SOD activity and Pro content,the decrease in CAT activity and MDA content in the root of cotton seedlings,which effectively prevented the inhibition of Cd stress on the root growth of cotton seedlings.High concentrations of Mn could increase Cd content and SOD activity in cotton seedling roots, which affected the root growth of cotton seedlings.When using cotton to repair Cd-contaminated farmland,it can be less than 10 μmol/L Mn ion treatment is used to improve the Cd tolerance of cotton seedlings and ensure the normal growth of cotton plants.

Key words: Cotton seedlings, Manganese treatment, Cadmium stress, Roots, Growth

XIAO Caisheng, XIE Xin, LI Feng, GUO Lishuang, HE Lu, CHEN Haodong, LI Fei, KUANG Fengchun, ZHAO Yan, KUANG Zhengcheng. Physiological Response of Two Cotton Seedlings to Cadmium Stress Treated with Different Concentrations of Manganese[J]. Acta Agriculturae Boreali-Sinica, 2023, 38(6): 55-61. doi: 10.7668/hbnxb.20194143.

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Figures/Tables 7

Fig.1 Cadmium stress on the main root length in manganese-treated cotton seedlings Different lowercase letters represent significant difference(P<0.05).The same as Fig.2—7.

Fig.2 Effects of cadmium stress on the dry matter quality in manganese-treated cotton seedlings roots

Fig.3 Effects of cadmium stress on the activity of superoxide dismutase(SOD)in manganese-treated cotton seedlings roots

Fig.4 Effects of cadmium stress on the activity of catalase(CAT)in manganese-treated cotton seedlings roots

Fig.5 Effects of cadmium stress on malondialdehyde accumulation in manganese-treated cotton seedlings roots

Fig.6 Effects of cadmium stress on free proline accumulation in manganese-treated cotton seedlings roots

Fig.7 Effects of cadmium stress on cadmium accumulation in manganese-treated cotton seedlings roots

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