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#plant propagation

12 public questions tagged with this topic.

Plant tissue culture 2

Artificial seeds are produced by encapsulating:

Artificial seeds are produced by encapsulating somatic embryos which act as functional equivalent of zygotic embryo capable of germinating into complete plantlet, making them propagule of choice for synthetic seed technology. Somatic embryos possess bipolar organization with shoot and root apical meristems cotyledon storage reserves and protoderm providing desiccation tolerance after ABA maturation treatment inducing late embryogenesis abundant LEA proteins and accumulation of starch and proteins resembling seed maturation. Shoot tips root tips or callus fragments lack this bipolarity and requ

Ref: Redenbaugh 1993 Synseeds; NCBI artificial seed encapsulation review.

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Plant tissue culture 1

Meristem culture is mainly used to produce:

Meristem culture technique involves aseptic excision of apical dome typically 0.1-0.5 millimeter containing tunica corpus but no differentiated leaf primordia and culture on MS based medium for regenerating plants principally to obtain virus free stocks. Foundation lies in observation that meristematic dome lacks differentiated vascular sieve elements through which many systemic viruses like Potato Virus Y, Tobacco Mosaic Virus, Cucumber Mosaic Virus travel long distance and also that rapid mitotic activity outpaces viral replication. High endogenous auxin and cytokinin concentration plus RNA

Ref: Bhojwani & Dantu Chap. 11 virus elimination; Walkey 1978 Phytopath Z.

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Plant tissue culture 1

Embryogenesis in tissue culture leads to formation of:

Somatic embryogenesis produces embryo-like structures from vegetative somatic cells, mimicking zygotic embryogeny yet arising without fertilization. Unlike organogenesis which is monopolar and vascularly connected, somatic embryos are bipolar possessing simultaneous shoot and root apical meristems and remain physiologically isolated enclosed by protoderm. Process begins with induction of embryogenic competence using synthetic auxin 2,4-D which triggers global chromatin decondensation, DNA hypomethylation, and upregulation of master regulators SOMATIC EMBRYOGENESIS RECEPTOR KINASE1 SERK1, LEAFY

Ref: Zimmerman, Plant Cell 1993, Somatic Embryogenesis review; NCBI Bookshelf NBK26830.

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Plant tissue culture 1

Organogenesis in tissue culture results in formation of:

Organogenesis denotes development of discrete organs, shoots and roots, from callus or explants without forming embryo, contrasting with embryogenesis. It is monopolar, meaning each organ originates separately, producing either shoot or root axis with continuous vascular strand linking to mother callus, unlike bipolar somatic embryo that lacks such connection. Induction follows classic Skoog Miller hormonal balance: moderate auxin plus cytokinin sustains callus, while shifting ratio directs organ fate. Shoot formation activates shoot meristem regulators STM, WUS, KNAT1 and cytokinin signaling

Ref: Skoog & Miller 1957, Plant Physiol.; Campbell Biology 12th ed., Chap. 35 plant development.

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