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以温度弱敏感性棉花品种(科棉1号)和温度敏感性棉花品种(苏棉15)为材料,在人工气候室模拟自然温周期设置高温(34℃[38/30℃],HT)和对照(26℃[30/22℃],CK)2个温度处理,研究了花铃期不同时段进行高温胁迫后纤维发育重要相关物质的变化及其与纤维品质的关系.结果表明:在花后不同时间开始高温胁迫持续处理5 d,苏棉15纤维长度、纤维比强度、马克隆值响应高温胁迫的关键时间窗口分别为花后0~18.3 d,花后10.9~26.1d和花后10.5~34.0 d.因此,花后11~18 d左右是棉花综合纤维品质形成响应高温胁迫的关键时间窗口.在关键时间窗口对棉花进行高温处理5 d后,苏棉15纤维中的蔗糖含量相对常温条件下呈先降低后增加的变化趋势,胼胝质含量上升,纤维素含量下降4.2%,纤维长度变短(最大变幅为23.3%),纤维比强度上升(最大变幅为4.3%),马克隆值下降(最大变幅为10.5%)并偏离最适范围,纤维品质变差.科棉1号的上述纤维发育主要相关物质含量及纤维品质与苏棉15变化趋势一致、最敏感时间相近,仅变化幅度相对较小.
The temperature (34 ℃ [38/30 ℃], HT) was set in the artificial climate chamber to simulate the natural temperature cycle with the weak temperature sensitive cotton variety (Kemian 1) and the temperature sensitive cotton variety (Sumian 15) (26 ℃ [30/22 ℃], CK) were used to study the changes of fiber-related substances and their relationship with fiber quality at different stages of flower-boll stage under high temperature stress.The results showed that after flowering The key time window of high fiber stress, fiber length, fiber specific strength and micronaire in response to high temperature stress for 5 days after high temperature stress treatment started at different times were 0 ~ 18.3 days after anthesis, 10.9 ~ 26.1 days after anthesis and 10.5 ~ 34.0 d.Therefore, about 11 ~ 18 d after anthesis was the key time window for the formation of cotton comprehensive fiber quality in response to high temperature stress.When the cotton was subjected to high temperature treatment for 5 days in the key time window, The content of callose increased, the content of cellulose decreased by 4.2%, the length of fiber became shorter (the maximum amplitude was 23.3%), and the fiber specific strength increased (the maximum amplitude was 4.3%). The micronaire Value drops (maximum amplitude 10.5%) and deviates from the optimum range for fibers Qualitative difference. Section No. 1 consistency of cotton fiber development primarily related to the above-described concentrations and variation in the fiber 15 and Sumian quality trends similar to the most sensitive time, only a relatively small variation range.