单 位：
华中农业大学植物科学技术学院作物遗传改良国家重点实验室;长江大学农学院作物遗传育种研究所;长江大学园艺园林学院
关键词：
棉花MAGIC群体;赤霉素;缩节胺;生态响应;极端材料池
摘 要：
【目的】以70份棉花多基因型种群(MAGIC)后代株系为材料,研究株系主要性状对花铃期喷施缩节胺、缩节胺+赤霉素的生态响应,鉴定其敏感性。【方法】试验设缩节胺、缩节胺+赤霉素2个处理,每个处理1种浓度,即缩节胺(30 g/hm~2,兑水225kg/hm~2)、缩节胺+赤霉素(30 g/hm~2+0.5 g/hm~2,兑水225 kg/hm~2),以喷清水为对照。9月15日调查棉花株式图,测定单铃重、衣分、子指、理论皮棉产量。【结果】株高、5果枝长、10果枝长、顶部果枝长、单铃重、子指、皮棉产量较对照对缩节胺、缩节胺与赤霉素互作的响应达到极显著水平,与缩节胺处理相比,缩节胺与赤霉素互作对株高、果枝数、总果节、5果枝长、10果枝长的影响达到极显著水平,单株结铃数达到显著水平;除子指外,对其他10个指标均有促进作用。缩节胺与赤霉素互作可显著改变株高、果枝数、5果枝长和10果枝长的生态响应度,而对单株结铃数、单铃重、子指和皮棉产量的生态响应度无显著改变。基于表型生态响应度数据的聚类分析将群体分为3大类,并构建了3个材料池:钝感材料池、中间材料池、敏感材料池。【结论】在本试验条件下,棉花MAGIC群体后代株系性状对缩节胺、缩节胺与赤霉素互作产生了比较明显的响应,为生产中采用赤霉素缓和缩节胺对棉花的不良调控效应提供了依据。极端材料池的构建可以明确群体材料对环境的敏感性,为完善棉花生态响应机制奠定了基础。
译 名：
Ecological Response and Sensitive Identification of Descendant Lines of Cotton MAGIC Population to Interaction Effect of DPC and Gibberelin
作 者：
LI Min;SHI Zhi-peng;LIN Zhong-xu;LI Xiao-fang;LI Ding-guo;Institute of Crop Genetic and Breeding,College of Agriculture,Yangtze University;College of Horticulture and Gardening,Yangtze University;National Key Laboratory of Crop Genetic Improvement,College of Plant Science & Technology of Huazhong Agricultural University;
关键词：
Cotton MAGIC population;;Gibberelin;;DPC;;Ecological response;;Extreme material pools
摘 要：
【Objective】Using 70 cotton multi-parent advanced generation inter-cross( MAGIC) as tested materials,the ecological response of DPC spraying,combined of DPC and Gibberelin spraying during the flowering and boll-setting stage on cotton agronomic and yield-related traits were investigated.【Method】Two treatments with one concentration levels each,i. e. DPC 30 g/hm2 and watering 225 kg/hm2,combined of DPC 30 g/hm2 and Gibberelin 0. 5 g/hm2,watering 225 kg/hm2 were employed,and with spraying water as the control( CK). Cotton plant types were surveyed on September 15,and their single boll weight,lint percentage,seed index and lint yield were measured. 【Result】Compared with the controls,extremely significant response to DPC,combined of DPC and Gibberelin was observed in DPC-applied,combined of DPC and Gibberelin-applied cotton in terms of plant height,length of the 5th fruit branch,length of the 10 th fruit branch,length of the top fruit branch,single boll weight,seed index,lint yield. Compared with DPC,extremely significant response to combined of DPC and Gibberelin was observed in combined of DPC and Gibberelin-applied cotton in terms of plant height,fruit branch number,total boll-nodes,length of the 5th fruit branch,length of the 10 th fruit branch,significant response to combined of DPC and Gibberelin was observed in terms of boll number per plant. In addition to the seed index,the other 10 indicators were promoted. Significant change of ecological response degree of plant height, fruit branch number,length of the 5th fruit branch,length of the10 th fruit branch was observed by DPC and Gibberellin interaction,but the change of ecological response degree of boll number per plant,single boll weight,seed index,lint yield were not significant. Subject to the cluster analysis based on phenotype responsivity data,70 descendant lines of cotton MAGIC population were divided into 3 categories,and three material pools were finally constructed by reference to the screening results,including the sensitive material pool,theintermediate material pooland the insensitive material pool. 【Conclusion】Under this experimental condition,the ecological response of DPC spraying,combined of DPC and Gibberelin spraying on cotton agronomic and yield-related traits,were sharped,which could be used for reducing adverse regulatory effect by DPC. The construction of extreme material pools can clear the sensitivity of the population response to the environment,and lay the foundation for improving the ecological response mechanism of cotton.
