Effects of Cadmium Stress on Yield and Cadmium Absorption of Agaricus blazei and Its Control Techniques

doi:10.3969/j.issn.1000-2561.2022.12.009

Abstract

Abstract:

Cadmium (Cd) accumulation is an important problem influencing Agaricus blazei industry. Therefore, breeding low-Cd content varieties and exploring Cd prevention and control technology in A. blazei were of great importance. In this study, the effect of Cd on their yield and cadmium absorption of two varieties of A. blazei J37 and J1 under Cd stress treatments were investigated. The effect of CaSO₄application on cadmium absorption of A. blazei also was investigated. The effects of different Cd stress treatments on the traits of fruit bodies of J37 and J1strains. With the increase of exogenous Cd concentration, the pileus weight, stipe weight, pileus thickness, pileus diameter, stipe length, and stipe diameter decreased, respectively. The yield of J37 under different Cd stress increased by 32.5%, 45.1%, 31.0%, 38.2% and 36.5% than those of J1 in the first tides, respectively. Moreover, the yield of J37 was also higher than that of J1 in the second and third tides. The sensitive Cd concentration on protein quality of J1 and J37 was 10 mg/kg and 20 mg/kg, respectively. Under 20 mg/kg Cd treatment, the polysaccharide content of J1 was 8.2% higher than that of J37. But the Cd accumulation in J1 was all higher than that of J37 with the increase of Cd stress. Under the conditions of 10 mg/kg and 20 mg/kg Cd stress, the effects of CaSO₄application with 45 mg/kg on cadmium poisoning of J1 and J37 were the most obvious. The average control rate of cadmium poisoning by applying calcium fertilizer was 36.2% and 47.6%, respectively. Under the conditions of this experiment, 20 mg/kg cadmium content in the culture was the sensitive node of A. blazei to tolerate cadmium poisoning, and the yield of A. blazei decreased by more than 40.0% in the first tide. When the Cd concentration in the culture was less than 10 mg/kg, A. blazei could tolerate Cd stress. Results also showed that the weight or cap diameter or stalk diameter might be used as a direct indicator for judging the Cd toxicity.

Key words: Agaricus blazei Murill, cadmium stress, sporocarp, agronomic trait, yield, cadmium content

CLC Number:

X173
S646

CHEN Hua, LIU Penghu, YE Jing, LIN Yi, WENG Boqi, WANG Yixiang. Effects of Cadmium Stress on Yield and Cadmium Absorption of Agaricus blazei and Its Control Techniques[J]. Chinese Journal of Tropical Crops, 2022, 43(12): 2471-2481.

Figures/Tables 7

Tab.1 Main agronomic characters of Agaricus blazei under Cd stress treatments at different concentration

Fig. 1 Yield of different tide fruit bodies of A. blazei under Cd stress treatments at different concentration A: The first tide; B: The second tide; C: The third tide. * indicates significant difference between varieties at the same treatment (P<0.05).

Fig. 2 Crude protein content of different tide fruit bodies of A. blazei under Cd stress treatments at different concentration A: The first tide; B: The second tide; C: The third tide. * indicates significant difference between varieties at the same treatment (P<0.05).

Fig. 3 Polysaccharide content of different tide fruit bodies of A. blazei under Cd stress treatments at different concentration A: The first tide; B: The second tide; C: The third tide. * indicates significant difference between varieties at the same treatment (P<0.05).

Fig. 4 Cd content of different tide fruit bodies of A. blazei under Cd stress treatments at different concentration A: The first tide; B: The second tide; C: The third tide. * indicates significant difference between varieties at the same treatment (P<0.05).

Fig. 5 Yield of A. blazei after Cd stress treatment with CaSO4 A: 10 mg/kg Cd stress treatment; B: 20 mg/kg Cd stress treatment. * indicates significant difference between varieties at the same treatment (P<0.05).

Fig. 6 Cd content of A. blazei after Cd stress treatment with CaSO4 A: 10 mg/kg Cd stress treatment; B: 20 mg/kg Cd stress treatment. * indicates significant difference between varieties at the same treatment (P<0.05).

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