When the tuber of a potato begins to germinate the shoots which it puts out derive their food from the accumulated store of nutritive material which has been laid up in the cells of the tuber.
They soon acquire a cell-wall, and germinate without a period of rest.
Aplanospores would seem to represent zoospores arrested in their development; without reaching the stage of motility, they germinate within the sporangium.
Allowing for those which fail to germinate (perhaps 25%), loss in transplanting, weak and backward plants, &c., one ounce of seed should yield about 40,000 plants.
The spores germinate on a damp surface and enter the cortex through small cracks or wounds in the protecting layer.
Another parable compared the kingdom of God to seed which, when once planted, must inevitably germinate; the process was secret and slow, but the harvest was certain.
Tetraspores are at first naked, but soon acquire a cell-wall and germinate without a period of rest.
The lactic acid bacillus, always present in unboiled milk (to which the souring of milk is due), is easily destroyed by heat; but the bacillus mesentericus, often found in it, forms spores, which are not destroyed by ordinary boiling, and germinate when the milk is kept at a moderately warm temperature, producing a brisk fermentation whereby a large volume of gas is liberated.
During the middle of the 2nd century a number of varying christological views began to germinate, growing for a time side by side.
Zoospores are of two kinds: (I) Those which come to rest and germinate to form a new plant; these are asexual and are zoospores proper.
The only physiological peculiarity exhibited in common by all spores is that they germinate and initiate the production of a new fungus-plant.
They germinate only in the second year after sowing; in the course of their first year the seedlings attain a height of 6 to 12 in.
The sporangia may also germinate directly without undergoing division.
When the spores germinate the germ-tubes surround the algal cells, which now increase in size and become the normal gonidia of the thallus.
This stage in the life-history was formerly regarded as a distinct fungus with the name Roestelia cancellata; it is now known, however, that the spores germinate on young juniper leaves, in which they give rise to this other stage in the plant's history known as Gymnosporangium.
In these cases, however, the potential gametes may, failing conjugation, germinate directly, like the zoospores derived from unilocular sporangia.
This is in consonance with the facts already mentioned that zoospores germinate forthwith, and that the sexually-produced cell or zygote enters upon a period of rest.
They are characterized especially by the zygospores, but the asexual organs (sporangia) exhibit interesting series of changes, beginning with the typical sporangium of Mucor containing numerous endospores, passing to cases where, as in Thamnidium, these are accompanied with more numerous small sporangia (sporangioles) containing few spores, and thence to Chaetocladium and Piptocephalis, where the sporangioles form but one spore and fall and germinate as a whole; that is to say, the monosporous sporangium has become a conidium, and Brefeld regarded these and similar series of changes as explaining the relation of ascus to conidium in higher fungi.
The very large single spores of Pertusaria have been shown to contain numerous nuclei and when they germinate develop a large number of germ tubes.
Both aplanospores and akinetes may germinate with or without the formation of zoospores at the initial stage.
In favour of the conidial view is the fact that in the case of Collema and a few other forms the spermatia have been made to germinate in artificial cultures, and in the case of Calicium parietinum Moller succeeded in producing a spermogonia bearing thallus from a spermatium.
The conidia are fragrant and are carried by bees to the stigma of the bilberry; here they germinate with the pollen and the hyphae pass with the pollen tubes down the style; the former infect the ovules and produce sclerotia, therein reducing the fruits to a mummified condition.
(2) Those which are unable to germinate of themselves, but fuse with another cell, the product giving rise to a new individual; these are sexual and are zoogametes (Gr.
Gametes which fail to conjugate sometimes assume the appearance of zygospores and germinate in due course.
An epiphytic fungus is not necessarily a parasite, however, as many saprophytes (moulds, &c.) germinate and develop a loose mycelium on living leaves, but only enter and destroy the tissues after the leaf has fallen; in some cases, however, these saprophytic epiphytes can do harm by intercepting light and air from the leaf (Fumago, &c.), and such cases make it difficult to draw the line between saprophytism and parasitism.
It is known that zoogametes, which usually conjugate, may, when conjugation fails, germinate directly (Sphaerella).
In 1876, however, Cohn had seen the spores germinate, and Koch, Brefeld, Pratzmowski, van Tieghem, de Bary and others confirmed the discovery in various species.
These teleutospores remain inactive on the straw until spring, when they germinate in manure heaps or on moist ground and produce minute sporidia, which are conveyed by air currents to the alternate host, in this case a barberry.
Fungus spores will not germinate without moisture, and attention to drainage helps to keep down this and other fungus pests.
In rare cases the oosphere has been known to germinate without fertilization (Oedogonium, Cylindrocapsa).
Fertilization has been observed at Naples; but it apparently depends on climatic conditions, as at Plymouth the oospheres have been observed to germinate parthenogenetically.
The gelatinous, generally reddish-brown masses of spores - the teleutospores - formed on the juniper in the spring germinate and form minute spores - sporidia - which give rise to the aecidium stage on the pear.
The spores of the fungus remain in the soil or in manure-heaps until spring, when they germinate and attack the first green leaves of the host plant.
Ericaceae, Pyrolaceae, Gentianaceae, Orchidaceae, ferns, &c. Recent experiments have shown that the difficulties of getting orchid seeds to germinate are due to the absence of the necessary fungus, which must be in readiness to infect the young seedling immediately it emerges from the seed.
It is therefore obvious that, if the tubers are exposed to the air where they are liable to become slightly cracked by the sun, wind, hail and rain, and injured by small animals and insects, the spores from the leaves will drop on to the tubers, quickly germinate upon the slightly injured places, and cause the potatoes to become diseased.
The fungus-spores, from some diseased plant, alight on the stigma of the flower, and germinate there along with the pollen-grains.
The spores, which are set free by the rotting of the sporangial wall, germinate much as in the case of Selaginella, though the similarity may be a case of independent resemblance.
there is no warrant for the popular notion that genuine "mummy wheat" will germinate; on the other hand some seeds lose vitality in little more than a year.
The spores formed on the delicate grey mould are carried during the summer from one plant to another, thus spreading the disease, and also germinate in the soil where the fungus may remain passive during the winter producing a new crop of spores next spring, or sometimes attacking the scales of the bulbs forming small black hard bodies embedded in the flesh.
In lepto and micro forms both aecidiospores and uredospores are absent, the sporidia producing a mycelium which gives rise directly to teleutospores; in the lepto forms the teleutospores can germinate directly, in the micro forms only after a period of rest.
These zoospores escape and swim about in any film of moisture, and on going to rest take a spherical form, germinate and produce threads of mycelium as at K.
Amid such conditions the idea of railways would have been slow to germinate had not a catastrophe furnished some impetus.
Further, several spores will be likely to germinate together owing to their elaters becoming entangled; a fact of some importance, since the antheridia and archegonia, though occurring sometimes on the same prothallus, are more often borne on separate individuals.
It is essential that the grains on the maltster's floor should germinate simultaneously, hence at the time of reaping, the whole crop must be as nearly as possible in the same stage of maturity.
germinate in late spring.
germinate best on the soil surface or in the upper 10 mm layer of soil.
germinate, plant in trays.
germinate when conditions are favorable.
They discussed what seeds need to germinate and planted runner beans and cress.
rumen digestion alone left 27% of seeds still able to germinate.
erratic to germinate.
germinate more readily than large ones.
The spores then germinate, and the growing bacteria produce the deadly botulism toxin.
germinate immediately, it needs sun ripening.
germinate well in areas covered in moss.
It consists of loose cellular tissue, and secretes a viscid matter which detains the pollen, and causes it to germinate.
The spores germinate in the large intestine and, once colonized, toxin is produced and absorbed into the infant's body from the entire intestinal tract.
germinate mainly in the autumn or over winter.
It takes only a few days for mold spores to germinate, and only a few weeks to extend hyphae and grow extensively.
In winter little winged nutlets with tiny airbags fly off in the wind and float down stream to germinate somewhere on another bank.
pansy seeds are eaten readily by chaffinches and a small number survive passage through the digestive system to germinate in the droppings.
ribwort plantain seeds may germinate in the autumn of production or early the following year.
Leave shed seeds on the soil surface to germinate, die or suffer predation.
B, spores germinate away from a living root hair (rh ).
The Royal Botanic Garden Edinburgh also has facilities to germinate seed to test for viability.
Oospores germinate in wet soils to produce a sporangium which then rapidly differentiates to release zoospores.
When these spores germinate they must find a suitable photosynthetic partner in order to re-establish the lichen symbiosis.
Oospores germinate to release motile zoospores that are readily carried in soil water and thus spread the disease within the crop.
Eventually, the resting spores germinate to release haploid zoospores which repeat the infection cycle. [© Jim Deacon] Fig.
The acorns should be sown in November on well-prepared ground, and covered to a depth of i a or 2 in.; the seeds germinate in the spring, and the seedlings are usually transplanted when one or two years old to nursery-beds, where they are allowed to grow from two to four years, till required for the plantation.
They are attracted to the flower by its colour or its perfume; they seek, collect or feed on its honey, and while so doing they remove the pollen from the anther and convey it to another flower, there to germinate on the stigma when its tubes travel down the style to the ovary where their contents ultimately fuse with the "oosphere" or immature egg, which becomes in consequence fertilized, and forms a seed which afterwards develops into a new plant (see article Angiosperms).
seeds take a year to germinate, unless the edges near the end bearing the caruncular projecting are rasped off.
The disease is peculiarly contagious and infectious, owing to the development of the fungus through the skin, whence spores are freed, which, coming in contact with healthy caterpillars, fasten on them and germinate inwards, giving off corpuscles within the body of the insect.
The other genera are more purely parasitic; the mycelium usually sends haustoria into the cells of the host and puts out branched, aerial conidiophores through the stomata, the branches of which abstrict numerous "conidia"; these either germinate directly or their contents break up into zoospores (fig.
When the latter germinate a slender "promycelium" is put out; in Ustilago and its allies this is transversely septate, and bears lateral conidia (sporidia); in Tilletia and its allies non-septate, and bears a terminal tuft of conidia (sporidia) (fig.
Childish ineptitudes are mingled with intuitions of maturest wisdom, and seeds of future thought germinate in the decaying refuse of past systems.
B, spores germinate away from a living root hair (rh).
To secure a good display of flower, however, the best time to sow is in August, and the soil should be a light one, where the seed can germinate freely, and where the plants will not become too robust before winter sets in.
Increase by layers and by seeds-which, however, do not germinate freely.
Seeds germinate readily in a cold frame, but a few years elapse between sowing and flowering.
The seeds often remain dormant for some time before vegetating; those of A. umbellata germinate readily.
Seeds germinate freely in a hot-bed in early spring.
My plant has finally seeded (en mass!) and I would love to know how to germinate the seeds.
If the seeds don't germinate, you can still have more plants, because jasminum mesnyi is extremely easy to propagate by layering or cuttings.
Celmisia seed should usually be sown directly after harvest, when it is fresh, although seed will not germinate until after it has experienced winter conditions.
Seeds germinate at irregular intervals over an extended period of time.
Seeds will usually begin to germinate in about 14 days after chilling.
Using the same example of cucumbers, the seeds take eight days to germinate.
Gently keep your seeds moist so they can germinate properly.
Once they germinate, the plastic can be removed.
As many gardeners who've used wood chips will attest, even when using landscape fabric pesky weeds find a way to germinate.
If the seeds don't germinate in two weeks, dig a bit to see if they're still there.
You may also wish to sow lettuce seeds, which need cool temperatures and moisture to germinate.
This will retain heat and moisture and allow bulbs to germinate.
Some seeds germinate better if started directly in the garden soil; they dislike being moved.
Most seeds need warmth to germinate, and they may simply rot in the ground before sprouting if planted too soon.
Some flower seeds need to be buried to a certain depth, while others must be left near the surface of the soil so sunlight helps the seeds germinate.
In all cases, flower seeds must be kept moist in order to germinate.
This is desirable because it speeds up the process and kills any seeds that might be waiting to germinate.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.