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Self Crosses Compared to Outcrossing Cannabis 4 года назад

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Self Crosses Compared to Outcrossing Cannabis
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Self Crosses Compared to Outcrossing Cannabis

Self Crosses Compared to Outcrossing Cannabis Research Article Kurtz, Lauren & Mahoney, Jonathan & Brand, Mark & Lubell, Jessica. (2020). Comparing Genotypic and Phenotypic Variation of Selfed and Outcrossed Progeny of Hemp. HortScience. 55. 1-4. 10.21273/HORTSCI15061-20. https://www.researchgate.net/publicat... Outcrossing vs. Self Crossing (Selfing) Outcrossing is when two unrelated (or distantly related) plants are bred (crossed) together Outcrossing increases the genetic variability Self crossing is when maternal and pollen parents are the same genotype. Goal is to reduce potential for genetic variability This is different then cloning which is asexual vegetative propagation When is Selfing Used? Feminized hemp seed producers often use selfing to maintain a strain name The process of selfing a cannabis plant may lead to inferior plants for cannabidiol (CBD) production. Selfed Progeny vs Outcrossed Progeny Selfed progeny were significantly smaller than outcrossed progeny for all measured traits Selfed progeny compared to outcrossed progeny… Half the height Had fewer nodes Reduced internode length Half the leaf area Half total dry weight Delayed by 7 days in flower development 63% less floral dry weight Equal CBD producers Both met the legal limit of 0.3% total THC Vegetative and Floral Growth and Yield These findings provide phenotypic and genotypic data to support that selfing in cannabis induces inbreeding depression Variegation Noticed All selfed progeny exhibited leaf variegation This is known to be a recessive genetic trait in higher plants. Variegation was first evident at the cotyledon growth stage For most plants the variegation persisted through day 35 However, three plants had variegated leaves until the end of the study Selfing in Cannabis Induces Inbreeding Depression Evidence of Inbreeding Depression in Selfed Cannabis… Selfed feminized seed had less vigorous plants and reduced yield. Increased homozygosity with negative recessive traits such as variegation observed which suggests inbreeding may occur more rapidly in hemp than other crops. Crossing Different Strains Can Increase Yields Crossing two different strains to maintain or increase heterozygosity could be a strategy to increase yields, and plants may be more uniform. If crossing within a strain is necessary growers should consider using two different genotypes of the strain to produce feminized seed and maintain strain name. Grower Suggestions Based on Research Hemp breeders may want to consider developing inbred parental lines to generate F1 feminized seed, which could produce plants that exhibit improved crop uniformity and hybrid vigor. It may be beneficial for feminized seed producers to use outcrossing instead of selfing to generate feminized seed for CBD production. Link to Lecture Slides: https://drive.google.com/file/d/1usR5... 420 Magazine Source Content by Slide Title: When is Selfing Used https://www.420magazine.com/community... Grower Suggestions https://www.420magazine.com/community... *Due to the description character limit the full work cited for "Self Crosses Compared to Outcrossing Cannabis" can be viewed at... https://drive.google.com/file/d/1OptN...

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