High frequency transformation ofKalanchoe laciniata

Area of Science:

• Plant biotechnology
• Molecular biology
• Agrobacterium-mediated transformation

Background:

• Kalanchoe laciniata is a valuable ornamental plant.
• Efficient genetic transformation methods are crucial for its improvement.
• Agrobacterium tumefaciens is a common tool for plant genetic engineering.

Purpose of the Study:

• To optimize the cocultivation period for Agrobacterium-mediated transformation of Kalanchoe laciniata.
• To evaluate the effect of different Agrobacterium strains and cocultivation durations on transformation efficiency.

Main Methods:

• Leaf explants of Kalanchoe laciniata were cocultivated with Agrobacterium tumefaciens strains (A208SE, GV3111SE, EHA101) carrying the binary vector pROA93.
• Cocultivation periods varied from 2 to 8 days.
• Transformation efficiency was assessed by GUS gene transient expression and stable transformation frequency.

Main Results:

• Prolonged cocultivation (6 days) significantly increased GUS gene transient expression (up to 100% explants, ~50% area).
• Cocultivation for 6-7 days led to a dramatic increase in stable transformation frequency (75-80% of explants produced transgenic plants).
• The nopaline strain A208SE, with 7 days of cocultivation, yielded up to 10 transgenic plants per explant.

Conclusions:

• Cocultivation duration is a critical factor for successful Agrobacterium-mediated transformation in Kalanchoe laciniata.
• A 6-7 day cocultivation period is optimal for achieving high frequencies of stable transformation.
• This optimized protocol can facilitate the genetic improvement of Kalanchoe laciniata.