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Scalable Transfection of Maize Mesophyll Protoplasts
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Embryogenic callus formation from maize protoplasts.

K K Kamo1, K L Chang, M E Lynn

  • 1Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA.

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Summary
This summary is machine-generated.

Rapidly dividing maize (Zea mays L.) protoplasts were achieved, forming somatic embryos that developed into plantlets. These protoplasts were successfully transformed with the chloramphenicol acetyltransferase (CAT) gene.

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Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Maize Genetics

Background:

  • Efficient regeneration of maize (Zea mays L.) plants from protoplasts is crucial for genetic transformation and crop improvement.
  • Previous studies have faced challenges in achieving high-efficiency division and differentiation of maize protoplasts.
  • The development of embryogenic callus and suspension cultures is a prerequisite for protoplast isolation and manipulation.

Purpose of the Study:

  • To establish a robust protocol for obtaining rapidly dividing maize protoplasts capable of somatic embryogenesis.
  • To investigate the optimal conditions for maize protoplast culture and subsequent plantlet regeneration.
  • To demonstrate the transient transformation of maize protoplasts with a reporter gene.

Main Methods:

  • Protoplasts were isolated from an embryogenic suspension culture of maize hybrid A188xBlack Mexican Sweet, derived from Type II callus.
  • Protoplast culture was performed in a low-osmoticum medium (0.3 M mannitol) with optimized 2,4-dichlorophenoxyacetic acid concentration (4.0 mg/L) in N6 basal medium.
  • Transient transformation was achieved using the chloramphenicol acetyltransferase (CAT) gene driven by the cauliflower mosaic virus (CaMV-35S) promoter.

Main Results:

  • Rapidly dividing maize protoplasts were successfully obtained, leading to the formation of callus.
  • The callus differentiated into somatic embryos, which were further induced to form roots and leaf-like structures.
  • Transient expression of the CAT gene was confirmed in the transformed maize protoplasts.

Conclusions:

  • This study presents a reliable method for generating totipotent maize protoplasts that can undergo somatic embryogenesis and plant regeneration.
  • The established protocol provides a foundation for genetic engineering applications in maize using protoplast transformation.
  • Optimized culture conditions, including osmoticum and auxin concentration, are critical for successful maize protoplast development.