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<blockquote data-quote="zlavjestica" data-source="post: 221425" data-attributes="member: 28551"><p><strong><strong>What should I look for in an IBL? </strong></strong></p><p><strong></strong>First define your goals. Are you growing for yourself or for commercial production? Indoors or out? Mostly sativa or mostly indica? Keep only the plants that have the qualities you want, and mercilessly kill the rest. </p><p>Select plants that don't fall over; if you have to prop them up with toothpicks, you might as well cull them. Keep the ones that are free from abnormalities and hermaphroditism. Hopefully you've got enough many <a href="http://www.rollitup.org/marijuana-seeds.php" target="_blank">seeds</a> to be ruthless. Keep the ones that show better resistance to disease and pests. Even though the progeny performance is more important than the individual, there is a positive relationship between the overall vigour of an IBL and the yield of its hybrids. If they produce vigourous plants they are more likely to pass these traits on. </p><p></p><p><strong><strong>What is recurrent selection?</strong></strong></p><p><strong></strong>Recurrent selection refers to selecting for certain traits generation after generation. </p><p></p><p>With the interbreeding of reselected plants, the breeder can access favorable <a href="http://www.overgrow.com/faq/browse.php?qa=759" target="_blank">recombinations</a> as well as stabilize traits within the genepool. Select your <a href="http://www.overgrow.com/faq/browse.php?qa=761" target="_blank">ideotype</a> in each IBL, but don't be totally reliant on the phenotype because its not always indicative of the actual genotype. Make yield and quality trials with test crosses and select the best ten lines. Intercross and repeat. </p><p></p><p>After recurrent selection is done, select new individuals to be the new parents of IBLs. These are then recurrently selected for four or five generations. After recurrent selection has been done in two seperate programs, an F1 single cross of the two lines (A X B) is then produced. </p><p></p><p>In reciprocal recurrent selection (RRS), pollen of multiple A males is used to pollinate ideal B females and pollen of B used to pollinate ideal plants of A. Thus A is used as a tester to select for the <a href="http://www.overgrow.com/faq/browse.php?qa=48" target="_blank">combining ability</a> of B plants, and B is a tester for A. At the same time,inbred seedlots(A X A) and (B X B) are made,using mixed male pollen and the best females of each population. Store the resulting seed-- the seedlines with the best combining ability will be used as parents of the next RRS cycle. </p><p></p><p>The (A X B) hybrid progeny are simply used as visual indicators of the combining ability that lies in the saved <a href="http://www.rollitup.org/marijuana-seeds.php" target="_blank">seeds</a>.These specific inbred parental lines are kept in reserve until the <a href="http://www.overgrow.com/faq/browse.php?qa=758" target="_blank">progeny testing</a> of the different (A X B) hybrids has shown which has better <a href="http://www.overgrow.com/faq/browse.php?qa=48" target="_blank">SCA</a> and will make the better hybrids. Since this is such a complicated strategy, good note taking and organization are definitely required.</p></blockquote><p></p>
[QUOTE="zlavjestica, post: 221425, member: 28551"] [B][B]What should I look for in an IBL? [/B] [/B]First define your goals. Are you growing for yourself or for commercial production? Indoors or out? Mostly sativa or mostly indica? Keep only the plants that have the qualities you want, and mercilessly kill the rest. Select plants that don't fall over; if you have to prop them up with toothpicks, you might as well cull them. Keep the ones that are free from abnormalities and hermaphroditism. Hopefully you've got enough many [URL="http://www.rollitup.org/marijuana-seeds.php"]seeds[/URL] to be ruthless. Keep the ones that show better resistance to disease and pests. Even though the progeny performance is more important than the individual, there is a positive relationship between the overall vigour of an IBL and the yield of its hybrids. If they produce vigourous plants they are more likely to pass these traits on. [B][B]What is recurrent selection?[/B] [/B]Recurrent selection refers to selecting for certain traits generation after generation. With the interbreeding of reselected plants, the breeder can access favorable [URL="http://www.overgrow.com/faq/browse.php?qa=759"]recombinations[/URL] as well as stabilize traits within the genepool. Select your [URL="http://www.overgrow.com/faq/browse.php?qa=761"]ideotype[/URL] in each IBL, but don't be totally reliant on the phenotype because its not always indicative of the actual genotype. Make yield and quality trials with test crosses and select the best ten lines. Intercross and repeat. After recurrent selection is done, select new individuals to be the new parents of IBLs. These are then recurrently selected for four or five generations. After recurrent selection has been done in two seperate programs, an F1 single cross of the two lines (A X B) is then produced. In reciprocal recurrent selection (RRS), pollen of multiple A males is used to pollinate ideal B females and pollen of B used to pollinate ideal plants of A. Thus A is used as a tester to select for the [URL="http://www.overgrow.com/faq/browse.php?qa=48"]combining ability[/URL] of B plants, and B is a tester for A. At the same time,inbred seedlots(A X A) and (B X B) are made,using mixed male pollen and the best females of each population. Store the resulting seed-- the seedlines with the best combining ability will be used as parents of the next RRS cycle. The (A X B) hybrid progeny are simply used as visual indicators of the combining ability that lies in the saved [URL="http://www.rollitup.org/marijuana-seeds.php"]seeds[/URL].These specific inbred parental lines are kept in reserve until the [URL="http://www.overgrow.com/faq/browse.php?qa=758"]progeny testing[/URL] of the different (A X B) hybrids has shown which has better [URL="http://www.overgrow.com/faq/browse.php?qa=48"]SCA[/URL] and will make the better hybrids. Since this is such a complicated strategy, good note taking and organization are definitely required. [/QUOTE]
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