During fruit development,
| the: | egg | zygote | central cell | integument | ovule | ovary wall |
|---|---|---|---|---|---|---|
| becomes the: | Zygote | Embryo | Endosperm | Seed Coat | Seed | Fruit |
| The hormone | Ethylene | initiates the ripening response in fruit tissue: |
| Unripe Fruit | Enzyme Produced | Ripe Fruit | ||
|---|---|---|---|---|
| physical condition | chemical cause | chemical cause | physical condition | |
| green | chlorophyll | hydrolase | anthocyanin | red |
| hard | pectin | pectinase | less pectin | soft |
| sour | acid | kinase | neutral | neutral |
| mealy | starch | α-amylase | sugar | sweet+juicy |
| odorless | large organics | hydrolases | small organics | fragrance |
| The process above, occurring in a layer in a pedicel, causes | fruit | abscision. |
| The process above, occurring in a leaf blade, causes | leaf | senescence. |
| The process above, occurring in a layer in a petiole, causes | leaf | abscission. |
| The three fundamentally-different parts of a seed are: | ||
| seed coat | storage tissue | embryo |
| These functions: | occur in these parts of the embryo: |
|---|---|
| growth of the shoot | shoot apex |
| photosynthesis (and storage) | cotyledon |
| lifting the shoot above the soil | hypocotyl |
| producing lateral roots | radicle |
| penetrating the soil | root apex |
This page © Ross E. Koning 1994.
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