| 1 | Environmental factors on crop breeding and seed production. | |
| 2 | At the same time, the artificial populations should be expanded from seeds collected in years of high seed set. | |
| 3 | Progenies were produced by each mother tree with 19 male trees. | |
| 4 | Self-incompatability and male-sterility in seed production. | |
| 5 | In practice, seeds should not be stored dry but stratified on removal from the fruit. |