# US 11,432,487 B2 · Systems, methods and kits for micropropagation of Cannabis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,432,487 B2 - Document ID: US11432487B2 - Status: Granted - Kind: B2 - Application number: 17/050,940 - Filed: 2019-05-10 - Published: 2021-07-29 - Granted: 2022-09-06 - Earliest claimed: 2018-05-11 - Assignees: Front Range Biosciences, Inc. - Applicants: Front Range Biosciences, Inc. - Inventors: Carmen Cecilia Zapata Carrero; Carolina Sarmiento; Jonathan David Vaught - Web page: https://patentgrep.com/patent/US11432487B2 ## CPC - A01H 4/005: {Methods for micropropagation; Vegetative plant propagation using cell or tissue culture techniques} - A01H 4/008: {Methods for regeneration to complete plants} - A01H 6/28: Cannabaceae, e.g. cannabis - A01H: NEW PLANTS OR {NON-TRANSGENIC} PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES ## Abstract Provided herein are systems, methods and kits for micropropagating disease-free cannabis plants, referred to as the Clean Stock® method. Also provided are Clean Stock® cannabis plants produced using such systems, methods and kits. ## Claims ### Claim 1 A system for in vitro propagation of disease-free clonal cannabis plants, comprising: (a) a clean explant from a mother cannabis plant maintained in a vegetative state throughout its life, wherein the mother cannabis plant is a virus-tested and culture-indexed mother cannabis plant; (b) aseptic tissue culture media for propagation of the clean explant, wherein the tissue culture media comprises Driver and Kuniyaki Walnut (DKW) media and no hormones; (c) an incubator for propagation of the clean explant comprising conditions effective to produce disease-free cannabis plants; and (d) disease-free clonal cannabis plants. ### Claim 2 (depends on 1) The system of claim 1, wherein the clean explant is one or more of meristematic tissue, an apical explant, a nodal explant, root tips, shoot tips, young stems and young leaves. ### Claim 3 (depends on 1) The system of claim 1, wherein said conditions effective to produce disease-free cannabis plants comprise an incubator with controlled light intensity, photoperiod, temperature and humidity. ### Claim 4 A method for in vitro propagation of disease-free clonal cannabis plants, comprising: (a) obtaining a clean explant from a mother cannabis plant; (b) placing the clean explant on tissue culture media under aseptic conditions on day 0, wherein the tissue culture media comprises Driver and Kuniyaki Walnut (DKW) media and no hormones; and (c) micropropagating the clean explant to produce disease-free clonal cannabis plants, wherein within 15 to 17 weeks following day 0, the number of clonal disease-free cannabis plants produced is at least 200 times (200×), at least 210 times (210×), at least 220 times (220×), at least 230 times (230×), at least 240 times (240×), at least 250 times (250×), or at least 256 times (256×) the number of starting clean explants, or (c′) micropropagating the clean explant to produce disease-free clonal cannabis plants, wherein within 15 to 17 weeks following day 0, the number of clonal disease-free cannabis plants produced is at least 1000 times (1000×), at least 2000 times (2000×), at least 3000 times (3000×), at least 4000 times (4000×), at least 4020 times (4020×), at least 4040 times (4040×), at least 4060 times (4060×), at least 4080 times (4080×), or at least 4096 times (4096×) the number of starting clean explants. ### Claim 5 (depends on 4) The method of claim 4, wherein within 15 to 17 weeks following day 0, the method is effective to produce a number of disease-free clonal cannabis plants selected from the group consisting of, 30 to 1536 clonal disease-free cannabis plants when tissue culture is initiated with 6 clean explants, 45 to 2304 clonal disease-free cannabis plants when tissue culture is initiated with 9 clean explants, and 60 to 3072 clonal disease-free cannabis plants when tissue culture is initiated with 12 clean explants. ### Claim 6 (depends on 4) The method of claim 4, wherein the clean explant is one or more of meristematic tissue, an apical explant, a nodal explant, root tips, shoot tips, young stems and young leaves. ### Claim 7 (depends on 4) The method of claim 4, wherein the mother cannabis plant is a virus-tested and culture-indexed mother plant. ### Claim 8 (depends on 4) The method of claim 4, wherein the disease-free clonal cannabis plants are true-to-type and have the chemotype of a marijuana cultivar. ### Claim 9 (depends on 4) The method of claim 4, wherein the disease-free clonal cannabis plants are true-to-type and have the chemotype of a hemp cultivar. ### Claim 10 (depends on 4) The method of claim 4, wherein within 15 to 17 weeks following day 0, the method is effective to produce a number of disease-free clonal cannabis plants selected from the group consisting of 30 to 24576 clonal disease-free cannabis plants when tissue culture is initiated with 6 clean explants, 45 to 36864 clonal disease-free cannabis plants when tissue culture is initiated with 9 clean explants, and 60 to 49152 clonal disease-free cannabis plants when tissue culture is initiated with 12 clean explants. ### Claim 11 A method of producing true-to-type disease-free clonal cannabis plants by micropropagation of an explant from a mother cannabis plant, comprising: (a) initiating tissue culture from an explant of a mother cannabis plant; (b) performing culture indexing; (c) micropropagating the explant; (d) pre-rooting or rooting the explant; and (e) acclimatizing the explant, wherein the method is effective to produce a number of disease-free clonal cannabis plants that is at least 200 times (200×) the number of starting explants within 15 to 17 weeks of initiation of the culture, and wherein the method comprises culturing the explants with tissue culture media comprising Driver and Kuniyaki Walnut (DKW) media and no hormones. ### Claim 12 (depends on 11) The method of claim 11, wherein the explant is one or more of meristematic tissue, an apical explant, a nodal explant, root tips, shoot tips, young stems and young leaves. ### Claim 13 (depends on 11) The method of claim 11, wherein performing culture indexing comprises placing the explant into aseptic culture broth and screening the broth for bacteria and fungi.