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Journal of Experimental Botany, Vol 49, 221-227, Copyright © 1998 by Oxford University Press

ARTICLES

Streptomycin mimics the cool temperature response in rice plants

R Yoshida, T Sato, A Kanno and T Kameya
Institute of Genetic Ecology, Tohoku University, Aoba-ku, Sendai 980-77, Japan; Corresponding author at: Laboratory of Plant Molecular Biology, The Institute of Physical and Chemical Research (RIKEN), 3-3-1 Koyadai, Tsukuba, Ibaraki 305, Japan. E-mail: ryoshida@rtc.riken.go.jp

Exogenous application of streptomycin to etiolated seedlings of rice (Oryza sativa L.) during growth in darkness at moderate temperatures induced the same type of chlorosis as that elicited by cool temperatures. A comparison of sensitive (Indica) and tolerant (Japonica) cultivars indicated a close relationship between sensitivity to streptomycin and cool temperatures. Immunoblot (Rubisco LSU, SSU; CF1 complex of H+-ATPase; NADPH-protochlorophyllide oxidoreductase) and Northern blot analyses of plastid-encoded genes (16S rRNA; rbcL; rpoB; petB) in the streptomycin-treated sensitive cultivars revealed that the normal etioplast development was specifically inhibited by the antibiotic. Furthermore, the antibiotic did not affect the expression of mitochondrion-encoded genes (18S rRNA; atpA), which are also unaffected by cool temperatures. These result suggest that the effect of the antibiotic is quite similar to that of cool temperatures.Key words: Chlorosis, cool temperature, plastid development, rice, streptomycin.
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