NIAB - National Institute of Agricultural Botany

Trait information

Trait: Determinancy of flowering

Faba bean plants fall into three distinct flowering habits dictated by whether they produce a terminal inflorescence or not.

So-called determinate types produce a genetically determined number of axillary flowering trusses (inflorescences) until the apical meristem switches from the vegetative state and produces a terminal inflorescence. This termination to apical growth hastens pod fill and after-ripening and can be an advantageous trait where the length of the productive season is limited by daylight or intense heat.

The fully indeterminate types on the other hand continue to produce leaf node after leaf node as long as environmental conditions allow them to do so. Such plants are tall, and in long season environments may produce a yield advantage to the developing pods.

Most faba bean lines are semi-determinate – that is, although genetically indeterminate, the apical meristem becomes progressively less vigourous in its production of leaf nodes and eventually aborts in the vegetative state.

Marker list - assay descriptive names from dB