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在棉花苗期沙培盆栽条件下,以棉株生物量、吸钾量、钾利用指数及地上部干物质质量4项指标对38份棉花材料进行了耐低钾材料的评价与筛选。结果表明,各材料耐低钾能力存在较大差异,其中D5、D13、D37材料在低钾胁迫下表现干物质积累多、吸钾量高及钾利用指数高等特点,这3个材料在低钾环境下仍能很好地生长发育,属于耐低钾型材料;而D7、D16、D28、D35、D38等材料则表现恰恰相反,4指标综合表现较差,表明这些材料对土壤缺钾比较敏感,属于低钾敏感型材料。筛选出的耐低钾型材料将作为棉花耐低钾遗传改良的种质资源,也为开展棉花钾营养高效机理的研究提供基础材料和数据。
Under the condition of sand culture and potting in cotton seedling stage, 38 cotton materials were evaluated and screened for their low potassium content based on four indexes of cotton plant biomass, potassium uptake, potassium utilization index and aboveground dry matter quality. The results showed that there was a great difference in the ability of each material to tolerate low potassium. Among them, D5, D13 and D37 exhibited more dry matter accumulation, higher potassium uptake and higher potassium utilization index under low K stress. Under the environment can still grow well, are resistant to low-potassium materials; and D7, D16, D28, D35, D38 and other materials, the performance is just the opposite, the four indicators of the overall poor performance, indicating that these materials are more sensitive to potassium deficiency , Are low-potassium-sensitive materials. The selected low-K-tolerant materials will serve as germplasm resources for genetic improvement of cotton with low potassium tolerance, and provide the basic materials and data for carrying out the research on the efficient mechanism of potassium nutrition in cotton.