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Improving the identification, handling and storage of “difficult” seeds ...

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5.3. GROUP 2 report<br />

Group members<br />

▪ Samuel Bennett-Lartey<br />

▪ Peterson Wambugu<br />

▪ Sebili Naha<br />

▪ Jose Menezes<br />

1. Reasons for “difficult” <strong>seeds</strong><br />

▪<br />

▪<br />

▪<br />

▪<br />

Andre Lezar<br />

Frank Sichone<br />

Eduardo Morillo<br />

Robin Probert<br />

Species<br />

Reason<br />

Cleome gyn<strong>and</strong>ra ▪ Dormancy<br />

Amaranthus sp. ▪ Some are dormant<br />

Corchorus sp. ▪ Dormancy<br />

Gossypium sp. ▪ Oil content?<br />

▪ Climate cool <strong>and</strong> moist<br />

▪ Immature<br />

▪ Storage<br />

Helianthus annuus ▪ Oil content?<br />

▪ Climate cool <strong>and</strong> moist<br />

▪ Immature<br />

▪ Storage<br />

Avena sp.<br />

Dormancy<br />

Abelmoschus esculentus<br />

Physical dormancy<br />

Vigna subterranean<br />

Immaturity (leave in pods)<br />

Arachis hypogaea<br />

Immaturity (leave in pods)<br />

Allium Isp.<br />

Inherently short lived, small embryo<br />

Daucus carota<br />

Variation in seed maturity<br />

Oryza sp.<br />

Dormancy<br />

Research needed into underst<strong>and</strong>ing natural dormancy breaking – ecosystems.<br />

2. Training priorities<br />

▪ Seed physiology<br />

- Specialized training in seed physiology<br />

▪ Seed dormancy studies<br />

- Species by species on how to h<strong>and</strong>le each<br />

- Include basic principals on what to do for species that are not in such a manual.<br />

▪ Purity <strong>of</strong> samples<br />

- Removing immature, damaged <strong>and</strong> empty <strong>seeds</strong><br />

▪ Equipment <strong>of</strong>ten supplied without technical support<br />

- Training or sharing <strong>of</strong> laboratory management skills (knowledge <strong>of</strong> equipment <strong>and</strong><br />

available expertise) <strong>and</strong> quality assurance<br />

▪ Risk associated with conservation <strong>of</strong> recalcitrants in field gene banks<br />

- Cryo-<strong>storage</strong> training for SADC gene banks. University <strong>of</strong> KZN = Darwin funding for<br />

training<br />

▪ On-farm approach<br />

- Need social skills to succeed, learn from NGO’s<br />

Training recommendations:<br />

▪ Training need to be h<strong>and</strong>s-on, practical <strong>and</strong> extensive<br />

▪ Level 1: training <strong>the</strong> trainers – Kew<br />

▪ Level 2: training <strong>of</strong> technicians - regional

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