Meni
Forumi
Nove poruke
Sve teme
Najnovije teme
Nove poruke
♫ Radio
Dnevnici
Dnevnici Vanjskog Uzgajanja
Dnevnici Unutrašnjeg Uzgajanja
Završeni Vanjski Dnevnici
Završeni Unutrašnji Dnevnici
Novo
Popularne teme
Nove poruke
Najnovije aktivnosti
Članovi
Trenutno prisutni
Forumi
Prijava
Registracija
Nove poruke
Sve teme
Najnovije teme
Nove poruke
Meni
Install the app
Install
Objavite odgovor
Forumi
Marihuana
Obrazovanje
Marijuana Botany by Robert Connel Clark
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
Koristite zastareli pregledač. Možda neće pravilno prikazivati ove ili druge veb stranice.
Trebali biste nadograditi ili koristiti
alternativni pregledač
.
Poruka
<blockquote data-quote="cannebosanac" data-source="post: 20015" data-attributes="member: 1357"><p>poglavlje 2 nastavak</p><p></p><p>These seeds are of unknown par- </p><p>entage, the product of natural selection or of breeding by </p><p>the original farmer, Certain basic problems affect the </p><p>genetic purity and predictability of collected seed. </p><p>1 - If a Cannabis sample is heavily seeded, then the </p><p>majority of the male plants were allowed to mature and </p><p>release pollen, Since Cannabis is wind-pollinated, many </p><p>pollen parents (including early and late maturing stami- </p><p>nate and hermaphrodite plants) will contribute to the seeds </p><p>in any batch of pistillate flowers. If the seeds are all taken </p><p>from one flower cluster with favorable characteristics, then </p><p>at least the pistillate or seed parent is the same for all those </p><p>seeds, though the pollen may have come from many differ- </p><p>ent parents. This creates great diversity in offspring. </p><p>2 - In very lightly seeded or nearly sinsemilla Can- </p><p>nabis, pollination has largely been prevented by the removal </p><p>of staminate parents prior to the release of pollen. The few </p><p>seeds that do form often result from pollen from hermaph- </p><p>rodite plants that went undetected by the farmer, or by </p><p>random wind-borne pollen from wild plants or a nearby </p><p>field. Hermaphrodite parents often produce hermaphrodite </p><p>offspring and this may not be desirable. </p><p>3 - Most domestic Cannabis strains are random hy- </p><p>brids. This is the result of limited selection of pollen par- </p><p>ents, impure breeding conditions, and lack of adequate </p><p>space to isolate pollen parents from the remainder of the </p><p>crop. </p><p>When selecting seeds, the propagator will frequently </p><p>look for seed plants that have been carefully bred locally </p><p>by another propagator. Even if they are hybrids there is a </p><p>better chance of success than with imported seeds, pro- </p><p>vided certain guidelines are followed: </p><p>1 - The dried seeded flower clusters are free of </p><p>staminate flowers that might have caused hermaphrodite </p><p>pollinations. </p><p>2 - The flowering clusters are tested for desirable </p><p>traits and seeds selected from the best. </p><p>3 - Healthy, robust seeds are selected. Large, dark </p><p>seeds are best; smaller, paler seeds are avoided since these </p><p>are usually less mature and less viable. </p><p>4 - If accurate information is not available about the </p><p>pollen parent, then selection proceeds on common sense </p><p>and luck. Mature seeds with dried calyxes in the basal por- </p><p>tions of the floral clusters along the main stems occur in </p><p>the earliest pistillate flowers to appear and must have been </p><p>pollinated by early-maturing pollen parents. These seeds </p><p>have a high chance of producing early-maturing offspring. </p><p>By contrast, mature seeds selected from the tips of floral </p><p>clusters, often surrounded by immature seeds, are formed </p><p>in later-appearing pistillate flowers. These flowers were </p><p>likely pollinated by later-maturing staminate or hermaphro- </p><p>dite pollen parents, and their seeds should mature later and </p><p>have a greater chance of producing hermaphrodite off- </p><p>spring. The pollen parent also exerts some influence on the </p><p>appearance of the resulting seed. If seeds are collected </p><p>from the same part of a flower cluster and selected for </p><p>similar size, shape, color, and perianth patterns, then it is </p><p>more likely that the pollinations represent fewer different </p><p>gene pools and will produce more uniform offspring. </p><p>5 - Seeds are collected from strains that best suit the </p><p>locality; these usually come from similar climates and lati- </p><p>tudes. Seed selection for specific traits is discussed in detail </p><p>in Chapter III. </p><p>6 - Pure strain seeds are selected from crosses between </p><p>parents of the same origin. </p><p>7 - Hybrid seeds are selected from crosses between </p><p>pure strain parents of different origins. </p><p>8 - Seeds from hybrid plants, or seeds resulting from </p><p>pollination by hybrid plants, are avoided, since these will </p><p>not reliably reproduce the phenotype of either parent. </p><p>Seed stocks are graded by the amount of control ex- </p><p>erted by the collector in selecting the parents. </p><p>Grade #1 - Seed parent and pollen parent are known and </p><p>there is absolutely no possibility that the seeds resulted </p><p>from pollen contamination. </p><p>Grade #2 - Seed parent is known but several known stami- </p><p>nate or hemaphrodite pollen parents are involved. </p><p>Grade #3 - Pistillate parent is known and pollen parents </p><p>are unknown. </p><p>Grade #4 - Neither parent is known, but the seeds are col- </p><p>lected from one floral cluster, so the pistillate seed parent- </p><p>age traits may be characterized. </p><p>Grade #5 - Parentage is unknown but origin is certain, </p><p>such as seeds collected from the bottom of a bag of im- </p><p>ported Cannabis. </p><p>Grade #6 - Parentage and origin are unknown. Asexual Propagation </p><p>Asexual propagation (cloning) allows the preservation </p><p>of genotype because only normal cell division (mitosis) </p><p>occurs during growth and regeneration. The vegetative </p><p>(non-reproductive) tissue of Cannabis has 10 pairs of </p><p>chromosomes in the nucleus of each cell. This is known as </p><p>the diploid (2n) condition where 2n = 20 chromosomes. </p><p>During mitosis every chromosome pair replicates and one </p><p>of the two identical sets of chromosome pairs migrates to </p><p>each daughter cell, which now has a genotype identical to </p><p>the mother cell. Consequently, every vegetative cell in a </p><p>Cannabis plant has the same genotype and a plant resulting </p><p>from asexual propagation will have the same genotype as </p><p>the mother plant and will, for all practical purposes, de- </p><p>velop identically under the same environmental conditions.</p></blockquote><p></p>
[QUOTE="cannebosanac, post: 20015, member: 1357"] poglavlje 2 nastavak These seeds are of unknown par- entage, the product of natural selection or of breeding by the original farmer, Certain basic problems affect the genetic purity and predictability of collected seed. 1 - If a Cannabis sample is heavily seeded, then the majority of the male plants were allowed to mature and release pollen, Since Cannabis is wind-pollinated, many pollen parents (including early and late maturing stami- nate and hermaphrodite plants) will contribute to the seeds in any batch of pistillate flowers. If the seeds are all taken from one flower cluster with favorable characteristics, then at least the pistillate or seed parent is the same for all those seeds, though the pollen may have come from many differ- ent parents. This creates great diversity in offspring. 2 - In very lightly seeded or nearly sinsemilla Can- nabis, pollination has largely been prevented by the removal of staminate parents prior to the release of pollen. The few seeds that do form often result from pollen from hermaph- rodite plants that went undetected by the farmer, or by random wind-borne pollen from wild plants or a nearby field. Hermaphrodite parents often produce hermaphrodite offspring and this may not be desirable. 3 - Most domestic Cannabis strains are random hy- brids. This is the result of limited selection of pollen par- ents, impure breeding conditions, and lack of adequate space to isolate pollen parents from the remainder of the crop. When selecting seeds, the propagator will frequently look for seed plants that have been carefully bred locally by another propagator. Even if they are hybrids there is a better chance of success than with imported seeds, pro- vided certain guidelines are followed: 1 - The dried seeded flower clusters are free of staminate flowers that might have caused hermaphrodite pollinations. 2 - The flowering clusters are tested for desirable traits and seeds selected from the best. 3 - Healthy, robust seeds are selected. Large, dark seeds are best; smaller, paler seeds are avoided since these are usually less mature and less viable. 4 - If accurate information is not available about the pollen parent, then selection proceeds on common sense and luck. Mature seeds with dried calyxes in the basal por- tions of the floral clusters along the main stems occur in the earliest pistillate flowers to appear and must have been pollinated by early-maturing pollen parents. These seeds have a high chance of producing early-maturing offspring. By contrast, mature seeds selected from the tips of floral clusters, often surrounded by immature seeds, are formed in later-appearing pistillate flowers. These flowers were likely pollinated by later-maturing staminate or hermaphro- dite pollen parents, and their seeds should mature later and have a greater chance of producing hermaphrodite off- spring. The pollen parent also exerts some influence on the appearance of the resulting seed. If seeds are collected from the same part of a flower cluster and selected for similar size, shape, color, and perianth patterns, then it is more likely that the pollinations represent fewer different gene pools and will produce more uniform offspring. 5 - Seeds are collected from strains that best suit the locality; these usually come from similar climates and lati- tudes. Seed selection for specific traits is discussed in detail in Chapter III. 6 - Pure strain seeds are selected from crosses between parents of the same origin. 7 - Hybrid seeds are selected from crosses between pure strain parents of different origins. 8 - Seeds from hybrid plants, or seeds resulting from pollination by hybrid plants, are avoided, since these will not reliably reproduce the phenotype of either parent. Seed stocks are graded by the amount of control ex- erted by the collector in selecting the parents. Grade #1 - Seed parent and pollen parent are known and there is absolutely no possibility that the seeds resulted from pollen contamination. Grade #2 - Seed parent is known but several known stami- nate or hemaphrodite pollen parents are involved. Grade #3 - Pistillate parent is known and pollen parents are unknown. Grade #4 - Neither parent is known, but the seeds are col- lected from one floral cluster, so the pistillate seed parent- age traits may be characterized. Grade #5 - Parentage is unknown but origin is certain, such as seeds collected from the bottom of a bag of im- ported Cannabis. Grade #6 - Parentage and origin are unknown. Asexual Propagation Asexual propagation (cloning) allows the preservation of genotype because only normal cell division (mitosis) occurs during growth and regeneration. The vegetative (non-reproductive) tissue of Cannabis has 10 pairs of chromosomes in the nucleus of each cell. This is known as the diploid (2n) condition where 2n = 20 chromosomes. During mitosis every chromosome pair replicates and one of the two identical sets of chromosome pairs migrates to each daughter cell, which now has a genotype identical to the mother cell. Consequently, every vegetative cell in a Cannabis plant has the same genotype and a plant resulting from asexual propagation will have the same genotype as the mother plant and will, for all practical purposes, de- velop identically under the same environmental conditions. [/QUOTE]
Verifikacija
Objavite odgovor
Forumi
Marihuana
Obrazovanje
Marijuana Botany by Robert Connel Clark
Top
Bottom