The present invention provides methods for the production of viable explants from mature corn seeds, wherein the explant comprises the apical portion of the embryo axis of the corn seed. The present invention also relates to methods for producing such explants and for transforming the explants with a heterologous DNA.

The present invention relates to excision of explant material comprising meristematic tissue from seeds, and storage of such material prior to subsequent use in plant tissue culture and genetic transformation. Methods for tissue preparation, storage, and transformation are disclosed, as is transformable meristem tissue produced by such methods, and apparati for tissue preparation.

The present invention provides a method for improving transformation efficiency of a plant. The method according to the present invention comprises the use of a nucleic acid encoding the amino acid sequence set forth in SEQ ID NO: 2 or 4, or a nucleic acid encoding a polypeptide comprising an amino acid sequence having at least 85% identity with the amino acid sequence set forth in SEQ ID NO: 2 or 4, and having a function of improving transformation efficiency of a plant.

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.

Provided herein are devices, systems, and methods for airborne rooting and/or callusing of cuttings. The device includes a container defining an interior that can be humidified to allow for development of calluses or roots.

Plant cell fate and development is altered by treating cells with cellular reprogramming factors. Embryogenesis inducing embryogenesis factor genes and/or morphogenic developmental genes are used as cellular reprogramming factors, specifically comprising polypeptides or polynucleotides encoding gene products for generating doubled haploids or haploid plants from gametes. Maize microspores treated by contacting the isolated cells with an exogenous purified, recombinant embryogenesis inducing embryogenesis factor gene products and/or morphogenic developmental gene polypeptide results in embryogenesis. The gametes of a maize plant develop into embryoids when transformed with a genetic construct including regulatory elements and structural genes capable of acting in a cascading fashion to alter cellular fate of plant cells. Embryogenesis factor proteins and/or developmental morphogenic proteins expressed from a genetic construct are used for ex situ treatment methods and for in planta cellular reprogramming.

A problem to be solved by the present invention is to provide a non-natural plant in which expression of a gene of interest is induced and a method for producing the same. Particularly, the present invention relates to a non-natural plant in which the expression of the gene is stably induced even in the absence of a physical or chemical stimulus inducing the expression of the gene, and a method for producing the same. When the induction of the expression of the gene enhances a trait of a plant of interest, the present invention provides a non-natural plant in which the trait is enhanced and a method for producing the same. To solve the problem, a non-natural regenerated plant in which the expression of the gene is induced can be produced by forming a callus from a portion of the plant of interest and then subjecting the callus to a treatment by which the expression of the gene is induced.

The disclosure pertains to methods and compositions for the rapid and efficient transformation of plants. The disclosure further provides methods for producing a transgenic plant, comprising (a) transforming a cell of an explant with an expression construct comprising (i) a nucleotide sequence encoding a WUS/WOX homeobox polypeptide; (ii) a nucleotide sequence encoding a polypeptide comprising two AP2-DNA binding domains; or (iii) a combination of (i) and (ii); and (b) allowing expression of the polypeptide of (a) in each transformed cell to form a regenerable plant structure in the absence of exogenous cytokinin, wherein no callus is formed; and (c) germinating the regenerable plant structure to form the transgenic plant. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

A Stevia extract made from leaves of the Stevia rebaudiana plant is described. The extract has desired levels of steviol glycosides and is useful in food, beverage, and other consumable products.

The present invention relates to a method for Agrobacterium-mediated transformation and regeneration of Stevia plants. In particular, the method involves co-culturing leaf explants with Agrobacterium in a medium comprising acetosyringone and 2,4-dichlorophenoxyacetic acid in the dark, callus induction and shoot regeneration in a medium comprising 6-benzylaminopurine, 3-indoleacetic acid, a selective agent and an Agrobacterium eradicant in the dark, and root regeneration in a medium comprising 3-in-doleacetic acid in a light/dark cycle. The present invention also relates to the overexpression of SrDXS I and SrKAH in transgenic plants, resulting in the enhancement of steviol glycosides in the transgenic plants. The present invention further relates to the overexpression SrUGT76G I in transgenic plants, resulting in higher Rebaudioside A (Reb A) to stevioside ratios in the transgenic plants.