Cleaved AFLP (cAFLP), a modified amplified fragment length polymorphism analysis for cotton

Area of Science:

• Plant genetics and genomics
• Molecular marker technology
• Agricultural biotechnology

Background:

• Amplified fragment length polymorphism (AFLP) has limited utility in cotton due to low polymorphism levels.
• Developing high-resolution genetic maps and accurate fingerprinting is crucial for cotton breeding and research.

Purpose of the Study:

• To introduce and evaluate cleaved amplified fragment length polymorphism (cAFLP) as an improved molecular marker technique for cotton.
• To assess the efficacy of cAFLP in generating more polymorphic markers compared to traditional AFLP.
• To explore the combined use of AFLP and cAFLP for enhanced genome-wide mapping and fingerprinting.

Main Methods:

• Developed cleaved amplified fragment length polymorphism (cAFLP) by using frequent restriction enzymes to cleave AFLP fragments.
• Applied cAFLP and AFLP to four Upland cotton (Gossypium hirsutum) and three Pima cotton (Gossypium barbadense) genotypes.
• Proposed pooling AFLP and cAFLP amplicons for analysis using capillary-based DNA sequencing.

Main Results:

• cAFLP generated 67% more polymorphic markers in Upland cotton and 132% more in Pima cotton compared to AFLP.
• cAFLP yielded an average of 15.5 (Upland) and 25.5 (Pima) polymorphic markers per primer combination, versus 9.1 and 11.0 for AFLP.
• Pooled AFLP and cAFLP analysis produced an average of 18.5 (Upland) and 31.0 (Pima) polymorphic markers per primer pair.

Conclusions:

• cAFLP significantly enhances marker density and discriminatory power for cotton genetic studies.
• The combined AFLP and cAFLP approach offers a high-resolution, potentially unlimited marker system for genome-wide mapping.
• This refined technique is valuable for advancing cotton genetics, breeding, and molecular fingerprinting.