A 2024 Scientific Reports study irradiated corms of Gladiolus grandiflorus ‘White Prosperity’ with a 635-nm red He–Ne laser and measured growth, flowering, anatomy, pigments, chemistry and SSR-marker patterns.
Many traits improved under the 20 mW, five-minute treatment, while stronger or longer exposure could reduce performance. The important caveat is genetic interpretation: SSR band polymorphisms do not by themselves prove that the laser created stable, defined DNA mutations.
- The experiment tested power and exposure time
- The 20 mW, five-minute treatment produced many of the highest values
- Visible flower differences are not the same as a stable new variety
- SSR polymorphism is evidence of marker differences, not a sequenced causal mutation
- Practical use would require defining a reproducible dose window
- Reference
The experiment tested power and exposure time
Corms were exposed to 5, 20 or 50 mW for 0.5, 1, 3, 5 or 10 minutes. Researchers measured plant height, leaf number and area, flowering traits, corm production, chlorophyll, anthocyanin, nutrients, carbohydrates, phenolics, flavonoids and leaf anatomy.
The 20 mW, five-minute treatment produced many of the highest values
This condition produced particularly strong responses. Plant height, for example, was reported at about 117 cm compared with roughly 68 cm in the control, and several leaf, flower and corm traits also increased. Anatomical differences included changes in midvein thickness and vascular features.
More irradiation was not necessarily better. High power and long exposure reduced some traits, and the authors explicitly noted negative effects from excessive treatments.
Visible flower differences are not the same as a stable new variety
Changes in flower and leaf morphology were observed after irradiation. Those phenotypes are interesting for ornamental-crop research, but the study did not establish stable inheritance across multiple generations.
To claim a mutation-breeding method that reliably produces new varieties, researchers would need to show reproducibility, inheritance in progeny and ideally identify causal sequence changes.
SSR polymorphism is evidence of marker differences, not a sequenced causal mutation
Using 22 SSR primers, the study reported 112 bands, with 32 polymorphic bands and several positive markers. SSR analysis can reveal differences in marker patterns, but band appearance or disappearance does not identify a specific nucleotide change or prove that a laser directly created the responsible mutation.
Laser exposure can also influence reactive oxygen species, hormones, metabolism, membranes and enzyme activity. Growth stimulation and SSR-marker differences should therefore not be collapsed into a single causal claim.
Practical use would require defining a reproducible dose window
The clearest applied lesson is that biological response depends strongly on treatment dose: a moderate exposure was favorable in this cultivar, whereas stronger treatments could become inhibitory.
The exact 20 mW/five-minute condition should not be generalized to other crops, cultivars or laser systems. As of now, the study supports the conclusion that red-laser exposure can alter gladiolus growth, flowering, physiology and marker patterns under defined conditions—not that it is already a proven universal mutation-breeding technology.
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Reference
- Hassan M et al. Laser-induced changes in the gene expression, growth and development of Gladiolus grandiflorus cv. “White Prosperity”. Scientific Reports. 2024;14:6257. https://doi.org/10.1038/s41598-024-56430-6
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