Genetic analysis of safflower domestication

Area of Science:

• Plant genetics
• Crop domestication
• Comparative genomics

Background:

• Safflower (Carthamus tinctorius L.) is a valuable oilseed crop.
• Domestication of safflower and sunflower (Helianthus annuus L.) within the Asteraceae family was analyzed.
• Quantitative trait loci (QTL) for domestication traits were investigated.

Purpose of the Study:

• To analyze the genetic architecture of safflower domestication.
• To compare safflower domestication genetics with that of sunflower.
• To identify instances of quantitative trait loci (QTL) colocalization between safflower and sunflower.

Main Methods:

• Mapping of 61 quantitative trait loci (QTL) in safflower progeny.
• Analysis of 24 domestication-related traits.
• Comparative mapping of safflower QTL against previously identified sunflower QTL.

Main Results:

• 61 QTL were mapped, mostly with minor to moderate effects; two major QTL for flower color and leaf spininess.
• 14 safflower QTL colocalized with sunflower QTL for the same traits.
• Three traits (days to flower, achene length, selfed seed number) showed cultivar alleles with similar effects in both species.

Conclusions:

• Safflower domestication genetics are complex, similar to sunflower.
• Significant QTL colocalization between safflower and sunflower suggests parallel evolution.
• Shared underlying genes may have driven parallel trait transitions during domestication in both species.