Androecious Cucurbit Plants via CsACS8 Mutation
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Solution Overview
Problem
Current methods for controlling the floral type in plants, particularly in the Cucurbitaceae family, are costly and imperfect, as they require mechanical or chemical emasculation to prevent self-pollination, which is necessary for creating hybrid plants with desired traits, and there is a lack of androecious plants in natural states for species like melon and zucchini.
Innovation Solution
Identification and characterization of the gene responsible for the androecious sex phenotype in cucumber (CsACS8) and induction of mutations in the orthologous gene in melon to create androecious plants, allowing for the production of plants with only male flowers, facilitating hybrid creation without the need for costly emasculation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical or chemical emasculation is used to prevent self-pollination, then hybrid plant creation is enabled, but production cost increases and process complexity worsens
Solution Approach 1:
The patent applies parameter changes by modifying the genetic parameters of the plant through mutation breeding. Specifically, mutations are induced in genes controlling floral sex expression to create androecious plants (male-only) and gynoecious plants (female-only), fundamentally changing the reproductive parameter from bisexual/monoecious to unisexual, thereby eliminating the need for emasculation
Solution Approach 2:
The patent extracts the female reproductive organs from plants that would otherwise have them, creating androecious lines that possess only male flowers. This extraction of the female function is achieved through genetic mutation, allowing hybrid creation without mechanical or chemical removal of female parts
2Reliability
If mechanical or chemical emasculation is used to prevent self-pollination, then hybrid plant creation is enabled, but process complexity and time consumption increase
Solution Approach 1:
The patent changes the reproductive parameter of the plant from bisexual or monoecious to androecious through induced mutations in floral sex control genes. This parameter change simplifies the breeding process by making self-pollination biologically impossible without requiring complex mechanical or chemical intervention systems
3Reliability
If selection of exclusively male individuals is performed, then androecious plants can be obtained, but cultivation time and resources increase significantly
Solution Approach 1:
The patent performs preliminary action by inducing mutations in the parental generation to create androecious lines before the actual hybridization program begins. This preliminary genetic modification ensures that subsequent generations will naturally express the male-only phenotype without requiring extended cultivation and selection periods
Solution Approach 2:
The patent applies parameter changes by directly modifying the genetic control of floral sex expression through mutation breeding. This changes the fundamental parameter of floral sex determination, allowing rapid obtention of androecious plants without prolonged selection processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the efficient creation of androecious plants within the Cucurbitaceae family, which can be used as pollinators or in breeding programs, improving hybrid production by eliminating the need for costly emasculation methods and ensuring the production of plants with desired traits.
Implementation Method 1
The gene CsACS8 encodes for the 1-aminocyclopropane-1-carboxylate synthase 8, having a transforming activity of the S-adenosyl-L-methionine to the 1-aminocyclopropane-1-carboxylate
Data Source
AI summary
Plants of the Cucurbitaceae family and seeds of such plants with an androecious phenotype, whereas this sexual type is not natural in the plants, and the use of the plants and of the plant seeds of the invention. Moreover, the nucleic acid sequence responsible for androecy in the plants of the invention and on the polypeptide encoded by the nucleic acid sequence. Finally, methods of identifying the plants and the seeds.