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Effect of super absorbent polymer and fiber on the growth of ryegrass in simulate loam under drought stress

JIN Xiang-yi, SUN Wei, LIU Bo, ZHANG Feng, LI Ming-tang

HUBEI AGRICULTURAL SCIENCES 2024, 63 (12): 129-134. DOI: 10.14088/j.cnki.issn0439-8114.2024.12.024

Abstract （124）

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The effect of super absorbent polymer and fibers on the growth of ryegrass in simulate loam under drought stress was investigated using a potted water control method. The experiment was divided into four groups, namely the control group （without addition）, 1% fiber group, 0.3% super absorbent polymer group, and 1% fiber+0.3% super absorbent polymer group. During the experiment, samples were taken and measured on the first day as a control, and then water was cut off to start the drought stress experiment. On the 5, 10, 15, 20, 25, and 30 d of the experiment, the growth characteristics of ryegrass were observed, and the relative water content, relative water deficit,relative conductivity,malondialdehyde,soluble sugar, proline and chlorophyll were recorded. The results showed that the drought resistance of ryegrass in each treatment was in the order of 0.3% super absorbent polymer+1% fiber group, 0.3% super absorbent polymer group, 1% fiber group, control group, from highest to lowest. Compared with the control, as the number of dry days increased, super absorbent polymer alone reduced the degree of wilting and yellowing of ryegrass in simulate loam; the degree of decline in the relative water content of ryegrass was slowed, resulting in a 25.38% increase in relative water content and a 28.57% reduction in relative water deficit; reduced the rate of increase in relative conductivity and malondialdehyde, resulted in a 23.57% reduction in relative conductivity and a 14.25% reduction in malondialdehyde content; slowed the degree of change in soluble sugar content was slowed and the rate of proline accumulation was reduced, resulting in a 13.06% reduction in soluble sugar accumulation and a 45.79% reduction in proline accumulation; the degree of decrease in chlorophyll SPAD value was slowed down, resulted in a 53.68% increase in chlorophyll SPAD value. The combined effect of super absorbent polymer and fiber was better than the effect of super absorbent polymer alone, compared to the control, the relative water content of ryegrass was increased by 36.09% and the relative water deficit was reduced by 40.62%; the relative conductivity and the malondialdehyde content were reduced by 26.69% and 31.69%; the accumulation of soluble sugars and proline was reduced by 16.91% and 65.42%; and the chlorophyll SPAD value was increased by 70.59%, which further extended the survival days of ryegrass under drought stress, and enhanced the drought tolerance of ryegrass.

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Acute toxicity test of peptides from monkfish meat in mice

SHEN Lu-jia, SHEN Meng-ran, HE Jia-wei, TANG Jing, ZHANG Xi, YANG Zui-su

HUBEI AGRICULTURAL SCIENCES 2024, 63 (12): 135-138. DOI: 10.14088/j.cnki.issn0439-8114.2024.12.025

Abstract （122）

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To investigate the acute toxicity of monkfish （Lophius litulon） polypeptides （LPs） in mice, eighteen healthy male ICR mice were randomly divided into three groups： control group, LPs low-dose group （2.5 g/kg）, and LPs high-dose group （10 g/kg）. Each mouse was administered with 20 mL/kg of LPs through gavage, and they were observed continuously for 14 days. The initial weight at the start of the experiment, weight on the 7th day, and weight on the 14th day were recorded. Signs of toxicity and mortality were also observed. At the end of the experiment, blood was collected from the mice’s eyeballs to test for liver and kidney function-related indicators. Heart, liver, kidney, spleen, and lungs were collected for external observation, and the tissues were subjected to HE staining for histological analysis. The results showed that no deaths occurred in any of the three groups of mice. Liver and kidney function-related indicators showed no significant differences compared to the control group （P>0.05）. The heart, liver, kidney, spleen, and lungs of mice in the high-dose and low-dose LPs group appeared normal, and microscopic examination of tissues stained with HE revealed clear structures without abnormal changes. Therefore, Lophius litulon polypeptides had no acute toxicity in mice.

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