Induction of small-segment-translocation between wheat and rye chromosomes
1Triticeae Research Institute, Sichuan Agricultural University, 611830, Dujiangyan, China.
Science in China. Series C, Life Sciences
|June 1, 1997
Summary
Researchers developed a novel method for wheat-rye translocation using genetic instability. This technique successfully induced small-segment translocations, offering new possibilities for plant breeding and molecular cytogenetics.
Area of Science:
- Plant genetics
- Cytogenetics
- Crop breeding
Background:
- Wheat-rye translocations are valuable for genetic research and crop improvement.
- Previous methods for inducing translocations were limited.
- Genetic instability in wheat-monosomic addition lines offers a potential avenue for novel translocation production.
Purpose of the Study:
- To describe a new approach for producing wheat-rye translocations.
- To investigate the frequency and characteristics of induced translocations.
- To evaluate the utility of this method for creating small-segment translocations (SS translocations).
Main Methods:
- Cytological analysis of 1,283 wheat-rye progeny using an improved C-banding technique.
- In situ hybridization with biotin-labeled DNA probes to detect rye chromatin.
- Physical mapping of translocated rye segments within wheat chromosomes.
Main Results:
- A wheat-rye translocation/substitution frequency of 4.91% was observed in 63 plants.
- Phenotypic variations were noted in 32 plants lacking detectable rye chromosome segments by C-banding.
- In situ hybridization confirmed small-segment translocations (SS translocations) in 20 of these variant plants, with rye segments inserted into various wheat chromosome regions.
Conclusions:
- The described technique is effective for inducing SS translocations in wheat.
- This method provides a valuable tool for molecular cytogenetics and plant breeding.
- The induced SS translocations expand the possibilities for genetic manipulation in wheat improvement.
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