Photosynthetica 2008, 46(3):363 | DOI: 10.1007/s11099-008-0066-0

Effect of gamma radiation on mutant induction of Fagopyrum dibotrys Hara

C. F. Jia1, A. L. Li1,*
1 Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, P.R. China

Agronomic traits, photosynthetic pigments, gas exchange, and chlorophyll (Chl) fluorescence parameters of red stem buckwheat (Fagopyrum dibotrys Hara) mutants induced by γ-radiation were compared with green control at seedling stage. Plant height, number of first-class branches, and rhizome biomass were inhibited significantly (p<0.01). Chl a, Chl b, and Chl a+b contents decreased with elevated dose of γ-rays, while increasing carotenoid content indicated that buckwheat was capable of adjusting to the radiation damage. Decrease in net photosynthetic rate was the result of both stomatal and non-stomatal limitations. Fluorescence parameters, such as F0, Fm, Fv/Fm, Fv/F0, ΦPS2, electron transport rate, and photochemical quenching declined significantly (p<0.01) as compared with control due to photoinhibition, while non-photochemical quenching increased to enhance thermal dissipation. Lower parameters implied that leaf tissue was damaged significantly by high dose of γ-radiation and therefore leaf senescence was accelerated.

Additional key words: agronomic traits; buckwheat; carotenoids; chlorophyll; 60Co; gas exchange; quenching; stomatal and nonstomatal limitations

Received: February 6, 2008; Accepted: April 30, 2008; Published: September 1, 2008  Show citation

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Jia, C.F., & Li, A.L. (2008). Effect of gamma radiation on mutant induction of Fagopyrum dibotrys Hara. Photosynthetica, 46(3), 363. doi: 10.1007/s11099-008-0066-0
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