Genetic Analysis and Mapping of a Thermo-sensitive White Stripe-Leaf Mutant at Seedling Stage in Rice ( Oryza sativa)

A thermo-sensitive white stripe-leaf mutant ( tws) was selected from the M 2 progeny of a japonica variety, Jiahua 1, treated by 60Co γ-radiation. In comparison with the wild type parent, the mutant displayed a phenotype of white stripe on the 3rd and 4th leaves, but began to turn normal green on th...

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Bibliographic Details
Published in:Rice science 2010-12, Vol.17 (4), p.276-281
Main Authors: LI, Chao, LIN, Dong-zhi, DONG, Yan-jun, YE, Sheng-hai, ZHANG, Xiao-ming
Format: Article
Language:English
Subjects:
gene mapping
genetics
rice
thermo-sensitivity
white stripe-leaf mutant
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Summary:A thermo-sensitive white stripe-leaf mutant ( tws) was selected from the M 2 progeny of a japonica variety, Jiahua 1, treated by 60Co γ-radiation. In comparison with the wild type parent, the mutant displayed a phenotype of white stripe on the 3rd and 4th leaves, but began to turn normal green on the 5th leaf when grown at low temperatures (20°C and 24°C). Furthermore, the content of total chlorophyll showed an obvious decrease in the leaves with white stripe. These results suggest that the expression of the mutant trait was thermo-sensitive and correlated with the leaf age of seedlings. The genetic analysis indicated that the mutant trait was controlled by a single recessive nuclear gene, designated as tws. In addition, by using SSR markers and an F 2 segregating population derived from the cross between the tws mutant and 9311, tws was mapped between the markers MM3907 and MM3928 with a physical distance of 86 kb on rice chromosome 4.
ISSN:1672-6308
1876-4762
DOI:10.1016/S1672-6308(09)60027-5