Time of Application of Desiccant Herbicides Affects Photosynthetic Pigments, Physiological Indicators, and the Quality of Cowpea Seeds

被引:0
作者
Coelho, Ester dos Santos [1 ]
Ribeiro, Joao Everthon da Silva [1 ]
Lopes, Welder de Araujo Rangel [1 ]
de Oliveira, Anna Kezia Soares [1 ]
Oliveira, Pablo Henrique de Almeida [1 ]
dos Santos, Gisele Lopes [1 ]
Barbosa, Ewerton da Silva [2 ]
Santos e Silva, Valecia Nogueira [1 ]
Lins, Hamurabi Anizio [1 ]
Benedito, Clarisse Pereira [1 ]
da Silveira, Lindomar Maria [1 ]
Filho, Antonio Cesar de Araujo [1 ]
Silva, Daniel Valadao [1 ]
Barros Junior, Aurelio Paes [1 ]
机构
[1] Fed Rural Univ Semiarid Reg, Agr Sci Ctr, BR-59625900 Mossoro, Brazil
[2] Univ Fed Paraiba, Agr Sci Ctr, BR-58397000 Areia, Brazil
关键词
Vigna unguiculata (L.) Walp; physiological quality; germination; toxicity; WHEAT SEEDS; YIELD; TRANSLOCATION; GLYPHOSATE; HARVEST; L;
D O I
10.3390/jox14030074
中图分类号
R99 [毒物学(毒理学)];
学科分类号
100405 ;
摘要
Chemical desiccation is widely used in agriculture to anticipate harvest and mitigate the effects of adverse environmental conditions. It is applied to both grains and seeds. Although this practice is widely used, there are still significant gaps in understanding the effects of different herbicide application times on seed quality and plant physiological responses. The objective of this study was to evaluate the effects of different herbicide application times on cowpea, focusing on seed quality, physiological responses, and biochemical composition, including chlorophylls, carotenoids, sugars, and proline, under nocturnal desiccation. In the first experiment, eight herbicides and two mixtures were applied at night: diquat, flumioxazin, diquat + flumioxazin, glufosinate ammonium, saflufenacil, carfentrazone, diquat + carfentrazone, atrazine, and glyphosate. All of the tested herbicides caused a reduction in normal seedling formation, with the diquat + carfentrazone combination resulting in 100% abnormal seedlings. A significant decrease in chlorophyll levels (chlorophyll a: 63.5%, chlorophyll b: 50.2%) was observed using diquat, which indicates damage to photosynthetic processes, while the carotenoid content increased. Total soluble sugars and proline were also negatively impacted, reflecting physiological stress and metabolic changes in seedlings. In the second experiment, three application times were tested with diquat, diquat + flumioxazin, and diquat + carfentrazone. Nocturnal application showed the most significant reduction in chlorophyll levels and increased carotenoid levels. Application at noon and late afternoon also significantly changed the soluble sugar and proline levels. These results indicate that the herbicide application time directly influences the seeds' physiological quality.
引用
收藏
页码:1312 / 1331
页数:20
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