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水稻形态学
Table Of Contents
Table Of Contents 1
Morphology of the Rice Plant 2
Germinating seed 2
Seedling 4
Tiller 6
Culm 8
Leaf 12
Panicle and Spikelets 18
Floret 24
Flower 27
Rice grain 29
Print Version 31
Index 32
Morphology of the Rice Plant
Germinating seed
When the seed germinates in well-drained and well-aerated soil, the coleorhiza, a covering enclosing the radicle or primary root, protrudes first.
Fig. 1 - The coleorhiza protrudes first.
Shortly after the coleorhiza appears, the radicle or primary root breaks through the covering.
Fig. 2 - Radicle or primary root breaks through the covering.
Two or more sparsely branched seminal roots follow. These roots eventually die and are replaced by many secondary adventitious roots.
Fig. 3 - Seminal roots
If the seed germinates in water, the coleoptile, a covering enclosing the young shoot, emerges ahead of the coleorhiza. The coleoptile emerges as a tapered cylinder.
Fig. 4 - Coleoptile emerging as a tapered cylinder.
Seedling
The mesocotyl or basal portion of the coleoptile elongates when the seed germinates in soil, and in darkness. It pushes the coleoptile above the soil surface.
Fig. 5 - Mesocotyl pushing the coleoptile above the soil surface.
The first seedling leaf, or primary leaf, emerges from the growing seed. It is green and shaped like a cylinder. It has no blade. The second leaf is a complete leaf. It is differentiated into a leaf blade and a leaf sheath.
Fig. 6 - First and second seedling leaf.
Tiller
The seedling will grow and develop branched tillers. Parts of the rice tiller include the roots, culm and leaves. Mature roots of the rice plant are fibrous and produce smaller roots called rootlets. All roots have root hairs to absorb moisture and nutrients.
Fig. 7 - Parts of the rice tiller.
There are two kinds of mature roots:
secondary adventitious roots
adventitious prop roots prop roots.
Fig. 8 - Types of roots.
Secondary adventitious roots are produced from the undergroun
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