Flower-inducing technology facilitates speed breeding in cassava

Area of Science:

• Agricultural Science
• Plant Breeding
• Horticulture

Background:

• Cassava is a vital tropical crop, essential for global food security, providing carbohydrates to over 800 million people.
• Developing improved cassava cultivars is crucial for enhancing yield, disease resistance, and food quality to combat hunger and poverty.
• Current cassava breeding programs face challenges due to difficulties in inducing flowering and obtaining sufficient seeds from desired parental lines.

Purpose of the Study:

• To evaluate and validate flower-inducing technologies for cassava breeding.
• To improve the efficiency of developing new farmer-preferred cassava cultivars through accelerated breeding.
• To identify optimal methods for early flowering and increased seed production in cassava.

Main Methods:

• Assessed the effectiveness of photoperiod extension, pruning, and plant growth regulators (PGRs) on 150 cassava breeding progenitors.
• Investigated the impact of 6-benzyladenine (synthetic cytokinin) and silver thiosulfate on flowering and seed production.
• Combined photoperiod extension with pruning and specific PGRs to optimize flower and fruit yields.

Main Results:

• Photoperiod extension significantly reduced flowering time in all progenitors, particularly late-flowering types (from 6-7 months to 3-4 months).
• A combination of pruning and 6-benzyladenine with photoperiod extension markedly increased fruit and seed production compared to other treatments.
• Silver thiosulfate showed no significant effect on fruit or seed yield when used with pruning.

Conclusions:

• A validated protocol for flower induction in cassava breeding programs was established.
• The findings support the implementation of early flowering and increased seed production techniques for speed breeding in cassava.
• Optimized flower induction is critical for accelerating the development of superior cassava varieties to address food security challenges.