Pretreatment with Silver Thiosulfate Increases the Auxin-Inductive Effect for Rooting Mature Chestnut Shoots

Area of Science:

• Plant Biotechnology
• Forestry Science
• Molecular Biology

Background:

• Chestnut (Castanea spp.) is ecologically and economically important.
• Optimizing vegetative propagation for mature chestnut material is challenging due to recalcitrance.
• Current biotechnological applications are limited by inefficient propagation methods.

Purpose of the Study:

• To investigate the role of ethylene in adventitious root formation in mature chestnut microshoots.
• To improve rooting responses in recalcitrant mature chestnut explants.
• To elucidate the molecular mechanisms underlying ethylene's effect on rooting.

Main Methods:

• Application of silver thiosulfate (ethylene signaling inhibitor) as a pretreatment.
• Auxin induction for adventitious root formation.
• Transcriptomic analysis and real-time PCR to study gene expression.

Main Results:

• Silver thiosulfate pretreatment significantly enhanced the rooting rate of mature chestnut microshoots.
• Ethylene negatively influences adventitious root induction in mature chestnut.
• Ethylene appears to repress the expression of auxin transport genes, impacting rooting.

Conclusions:

• Ethylene signaling plays a crucial inhibitory role in adventitious rooting of mature chestnut.
• Modulating ethylene signaling can improve vegetative propagation of mature chestnut.
• Further research is needed to characterize the roles of other hormones in chestnut rooting.