ASGR-BBML Gene Induces Parthenogenesis in Plants
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for achieving apomixis in plants, a form of asexual reproduction that results in genetically identical offspring, are limited by the need for meiosis and fertilization, and existing technologies struggle to induce parthenogenesis and apospory efficiently in crop plants.
Innovation Solution
The use of an ASGR-BBML gene construct, capable of encoding a polypeptide with at least 75% sequence identity to a specific polypeptide, is transformed into flowering plants to enable propagation from gametophytic or sporophytic cells in the ovule without egg cell fertilization, allowing for the derivation of progeny plants with sets of chromosomes from the transformed plant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional fertilization methods are used, then genetic diversity is improved, but the ability to produce clonal progeny is worsened
Solution Approach 1:
The invention separates the functions of male and female gametophytes, with the male gametophyte transformed to express ASGR-BBML for inducing parthenogenesis in the female gametophyte. This segmentation allows the female gametophyte to develop into an embryo without fertilization while the male gametophyte provides the necessary genetic trigger, enabling clonal propagation while maintaining controlled genetic input.
Solution Approach 2:
The transformed male gametophyte acts as an intermediary that delivers the ASGR-BBML gene product to the female gametophyte, triggering parthenogenesis. This intermediary mechanism allows genetic material to be transferred in a controlled manner while ultimately achieving clonal reproduction from the female parent, resolving the contradiction between genetic transfer and clonal propagation.
2Reliability
If parthenogenesis is induced in the female gametophyte, then clonal propagation is improved, but the requirement for male gametophyte transformation is worsened
Solution Approach 1:
Instead of transforming the female gametophyte to induce parthenogenesis directly, the invention transforms the male gametophyte to express ASGR-BBML, which then induces parthenogenesis in the female gametophyte. This inversion simplifies the overall system because the male gametophyte is already transformed for fertilization purposes, and the same transformation accidentally provides the parthenogenesis-inducing capability.
Solution Approach 2:
The ASGR-BBML gene construct in the male gametophyte serves multiple functions: it enables normal fertilization while simultaneously inducing parthenogenesis in the female gametophyte. This multi-functionality reduces the need for separate transformation systems, as one transformation achieves both fertilization capability and clonal propagation induction.
3Productivity
If apomixis is achieved without meiosis, then productivity is improved, but the complexity of controlling chromosome inheritance is worsened
Solution Approach 1:
The invention applies different reproductive mechanisms to different gametophytes: the male gametophyte undergoes normal meiosis and fertilization to provide genetic material, while the female gametophyte undergoes parthenogenesis to produce clonal progeny. This local differentiation of reproductive quality allows efficient clonal propagation while maintaining controlled genetic input from the male parent.
Solution Approach 2:
The male gametophyte is pre-transformed with ASGR-BBML before fertilization, so that when it interacts with the female gametophyte, it automatically induces parthenogenesis. This preliminary transformation ensures that the chromosome inheritance pattern is established before the actual reproduction event, simplifying the control of genetic outcomes while maintaining high reproduction efficiency.
Data Source
AI summary
Methods and compositions disclosed herein generally relate to genes involved in plant reproduction and methods of using the same.