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| Changes and evaluation of cotton fiber quality and cottonseed oil quality under cadmium stress |
| Received:November 08, 2023 |
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| KeyWord:cadmium pollution;substitute plantation;cotton growth;fiber quality;cottonseed oil |
| Author Name | Affiliation | E-mail | | ZHOU Chengxuan | College of Agriculture, Hunan Agricultural University, Changsha 410128, China | | | ZENG Zouguo | College of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China | | | WEN Yujiao | College of Mechanical and Electrical Engineering, Hunan Agricultural University, Changsha 410128 | | | ZHOU Nan | College of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China | | | ZHOU Zhonghua | College of Agriculture, Hunan Agricultural University, Changsha 410128, China | | | ZHOU Zhi | College of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China | zhouzhi@hunau.edu.cn | | LUO Wei | College of Agriculture, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| In order to explore the effect of Cd pollution on cotton fiber quality and cottonseed oil quality, and clarify the quality change rule of cotton product. The experiment used the cotton variety medium cotton house 65 as the material and set up a concentration gradient for six soil cadmium masses：0.97 mg·kg-1（Cd1）, 11.21 mg·kg-1（Cd11）, 14.26 mg·kg-1（Cd14）, 23.30 mg·kg-1（Cd23）, 49.36 mg·kg-1（Cd49）, and 77.11 mg·kg-1（Cd77）. The cadmium content in various organs of cotton, some agronomic characteristics, fiber quality, and cottonseed oil quality under different cadmium concentrations were compared and analyzed, and the cadmium ion concentration in cotton fiber and cottonseed oil was evaluated. The effect of cadmium stress on cotton plant height was significant. Compared with the Cd1 treatment, the total biomass of cotton treated with Cd11 was significantly increased. But under Cd23 treatment, the total biomass of cotton decreased significantly. In addition, petioles, stems, and roots were the main cotton organs to concentrate cadmium, and they had different enrichment abilities under various soil cadmium pollution concentrations. With the increase in soil cadmium concentration, the average length, uniformity index, fiber elongation, and spinning uniformity index of the upper part of cotton fiber decreased significantly, but the specific breaking strength and micronization value were not significantly affected. Under Cd49 and Cd77 cadmium stress treatment conditions, the cadmium ion concentration in cotton fiber exceeds the total cadmium concentration specified in GB/T 18885—2020, and cotton fiber use has risks. No cadmium ion was detected in cottonseed oil, and the effect of cadmium stress on the peroxide value of cottonseed oil was not significant. As the cadmium ion concentration increased, the cottonseed oil quality declined. This was evident in two ways：first, the oil's acidity（measured by acid value）steadily increased, and second, the oil's volume initially increased before ultimately decreasing. Cotton has excellent cadmium tolerance and accumulation ability. Cadmium stress significantly decreased the average length of the top half of cotton fiber, uniformity index, fiber elongation, and spinning uniformity index, as well as the yield of cottonseed oil, but increased the acid value of cottonseed oil. |
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