转FBP7::iaaM基因陆地棉种质冀资139纤维品质性状杂种优势分析

提高棉花(Gossypium hirsutum)产量兼顾改良纤维品质是棉花育种的重要目标, 而优良种质创新是品种改良的基础。FBP7::iaaM基因能够调控棉花胚珠表皮细胞IAA的含量, 进而促进棉纤维发育的起始。利用含有FBP7::iaaM基因的种质IF1-1, 通过常规杂交育种手段实现了目的基因向骨干亲本的转移, 培育了优良陆地棉种质冀资139, 并用4个不同类型的陆地棉品系对冀资139纤维品质性状进行了杂种优势分析。结果表明, FBP7::iaaM基因及其调控的优良性状可以在骨干育种亲本中传递, 具有较高的育种价值; 转FBP7::iaaM基因的冀资139具有综合性状优良、优质和高衣分等特点; 纤维长度、比强度及马克隆值的遗传主要由基因加性效应控制, 这为其作为骨干亲本的应用提供了理论依据。

Heterosis Analysis of the Fiber Quality in Gossypium hirsutum Germplasm Jizi139 with FBP7::iaaM

The improvement of cotton yield and fiber quality has become an important goal of cotton breeding, and the innovation of elite germplasm is the basis of variety improvement. The FBP7::iaaM could promote the cotton fiber initiation by regulating the content of IAA in ovule epidermis. Using the transgenic line of IF1-1 (FBP7::iaaM) as the parent, we have transferred the target gene to backbone parents and developed an excellent upland cotton germplasm Jizi139 by conventional cross breeding, and analyzed the heterosis of fiber quality traits of Jizi139 by crossing with four different types of upland cotton lines. Our results showed that FBP7::iaaM gene and the fine traits regulated by FBP7::iaaM can be transferred to breeding backbone parents with high breeding value. Jizi139 with FBP7::iaaM showed high lint percentage, high fiber quality and excellent comprehensive characteristics. Also, it was found that additive effect was the genetic basis of the fiber length, fiber strength and micronaire, which provided a theoretical basis for the selection and application of parents.