摘要
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.
By taking two cotton cultivars with different temperature-sensitivity（ Sumian 15,temperature-sensitive cultivar and Kemian 1,temperature-insensitive cultivar） as materials,an experiment with two temperature regimes（ high temperature： 34 ℃[38 /30 ℃ ],HT and control： 26 ℃[30 /22℃ ],CK） were set in climate chamber to study the change of key matters in different genotypes cotton in response to high temperature and their relationships with fiber quality. The results showed that as treated in the 34. 0 ℃ high-temperature regime for 5 days at different DPA（ days past anthesis）,significant change in fiber quality was observed in the temperature-sensitive cultivar Sumian15. The key time window for fiber length,fiber strength and Micronaire in response to the high temperature stress was from 0 to 18. 3 DPA,10. 9 to 26. 1 DPA,and 10. 5 to 34. 0 DPA,respectively.So,it could be concluded that the key time window of cotton fiber development in response to high temperature stress was around 11 to 18 DPA. After treated under high temperature stress at the key time window for 5 days,the content of sucrose decreased firstly then increased compared with that in the control,the content of callose increased and the content of cellulose decreased by 4. 2% in maximum. The fiber length decreased（ by 23. 3% in maximum）,fiber strength increased（ by 4.3% in maximum）,Micronaire decreased（ by 10. 5% in maximum）,and the general fiber quality deteriorated. Similar changes and trends were also observed in the temperature-insensitive cultivar Kemian 1 except that the variation degree was comparatively lower.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第8期2428-2436,共9页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(31271654)
江苏省自然科学基金项目(BK20131318)资助
关键词
棉花
关键时间窗口
高温胁迫
纤维品质
cotton
key time window
high temperature stress
fiber quality
作者简介
郭林涛，男，1989年生，硕士研究生．主要从事作物生理生态研究．E—mini：glt3023@qq．com
通讯作者．E-mail：w-youhua@njau．edu．cn
