germination

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germination

 [jer″mĭ-na´shun]
the sprouting of a seed, spore, or plant embryo.

germination

/ger·mi·na·tion/ (jer″mĭ-na´shun) the sprouting of a seed, spore, or plant embryo.ger´minative

germination

[jur′minā′shən]
Etymology: L, germen, sprout
1 the initial growth and development of an organism from the time of fertilization to the formation of the embryo.
2 the sprouting of a spore or the seed of a plant. germinate, v.
Germinationclick for a larger image
Fig. 171 Germination . A typical seedling.

germination

the beginning of the growth of a seed, spore or other structure that is dormant. Seed DORMANCY can be broken by several factors, depending on the species:
  1. the removal of a germination inhibitor which can be leached out by water.
  2. a period of cold temperature (STRATIFICATION).
  3. exposure to the correct wavelength of light to stimulate PHYTOCHROMES in the seed, for example, lettuce seeds require red light for germination and are inhibited by far-red light.
  4. rupture of a thick testa by (i) microbial breakdown, (ii) abrasive action of soil (as in desert plants), (iii) heat from bush fires, (iv) the effect of digestive juices (as when eaten by birds), (v) the softening action of water. Once dormancy is broken a regular sequence of events takes place: water is imbibed which hydrates the tissues increasing enzymic action in the ALEURONE layer (when present), a process aided by the release of GIBBERELLIN from the embryo; food stores are mobilized by production of enzymes in the ENDOSPERM or within the COTYLEDONS; AUXINS and CYTOKININS are formed which promote cell division and enlargement, causing the embryo to grow and burst through the testa. See Fig. 171 .

There are two main types of germination, depending on whether the seed cotyledons are carried above the soil (EPIGEAL) or remain below ground (HYPOGEAL).

germination

the sprouting of a seed or spore or of a plant embryo.
References in periodicals archive ?
But in the practice, period of four months is often not sufficient for the seed of perennial forage legumes to increase the germination rate to sufficient level (higher than 75%) to meet legal regulations for market, or to have high seeds germination rate allowing reduction of sowing rates and high seedling vigour.
Effects of GA3 Treatment on Seed Germination Rate using the Different Storage Methods
When the seeds were kept inside the fruit for storage, it can be verified, when maintained at room temperature, similar germination rates until six days of storage and, when using the cold chamber, until three days of storage (Table 4).
In summary, the results show that seed germination rate is significantly affected by three variables: seed sowing sites (in situ vs.
It seems that most everyone from beginning gardener to pro is getting great results and enjoying higher germination rates than we advertise.
faba seeds and the germination rate decreases gradually as the number of larvae developed within the seed increases.
It can work with both, but the technique too often fails to produce close to the same germination rates as when the seeds are drilled into the soil.
b) Germination rate index (GRI): expresses the rate of germination according to the total number of seeds that germinate in a time interval, it is calculated by the formula: GRI = G1/T1 + G2/T2 + G3/T3 + .
The plastic petri dish were incubated at 201 C for 16-36 h and then the leaves were washed with deionized water for germination rate examination.
2008), information regarding the positive characteristics about seed germination, through which it is possible to achieve a higher germination rate, although essential, is scarce in the literature.