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Protocol for Rescuing Young Cassava Embryos.

Zaida Lentini1, Geraldine Restrepo1, María E Buitrago1

  • 1Center of Specialized Natural and Biotechnological Ingredients (CINEB), School of Natural Sciences, Universidad Icesi, Cali, Colombia.

Frontiers in Plant Science
|May 28, 2020
PubMed
Summary
This summary is machine-generated.

Cassava embryo rescue is now possible at earlier stages (7-14 days after anthesis) using a new ovule culture protocol. This breakthrough enables the recovery of plants from immature embryos, overcoming previous limitations in cassava breeding.

Keywords:
cassavaembryo rescueimmature zygotic embryosinter-specific crosseswide crosses

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Area of Science:

  • Plant Biotechnology
  • Crop Science
  • Reproductive Biology

Background:

  • Cassava (Manihot esculenta) breeding faces challenges with fruit abortion, leading to low seed set after pollination.
  • Existing embryo rescue techniques in cassava are limited to later developmental stages (32-36 days after anthesis).
  • A need exists for protocols enabling embryo rescue at earlier developmental stages to improve cassava breeding efficiency.

Purpose of the Study:

  • To document cassava embryo development from 1 to 30 days after anthesis (DAA) using histological analysis.
  • To develop an effective embryo rescue protocol for immature cassava embryos at the pro-embryo to pre-globular stages (7-14 DAA).
  • To enable the recovery of fully developed plants from early-stage rescued embryos.

Main Methods:

  • Histological examination of hand-pollinated cassava ovules fixed between 1 and 30 DAA to characterize embryo development stages.
  • Development and application of an in vitro ovary/ovule culture technique for immature embryos (7-14 DAA).
  • Subsequent excision and culture of rescued embryos to induce germination and plantlet development.

Main Results:

  • Detailed characterization of cassava embryo development: pro-embryo (7 DAA), pre-globular (14 DAA), early globular (21 DAA), globular (24 DAA), and cotyledonary (30 DAA).
  • Successful recovery of fully developed plants from embryos rescued as early as 7-14 DAA using the developed ovary/ovule culture protocol.
  • Demonstrated viability of existing protocols for rescuing cotyledonary embryos (30 DAA) after ovule culture.

Conclusions:

  • The study provides crucial insights into early cassava embryo development, establishing a timeline for key developmental stages.
  • A novel embryo rescue protocol utilizing ovary/ovule culture allows for the successful recovery of plants from very immature embryos (7-14 DAA).
  • This advancement significantly enhances the potential of embryo rescue in cassava breeding, particularly for overcoming fruit abortion and facilitating wide crosses.