New approach for rice improvement using a pleiotropic QTL gene for lodging resistance and yield.
The use of fertilizer results in tall rice plants that are susceptible to lodging and results in reduced plant yields. In this study, using chromosome segment substitution lines, we identified an effective quantitative trait loci (QTL) for culm strength, which was designated STRONG CULM2 (SCM2). Positional cloning of the gene revealed that SCM2 was identical to ABERRANT PANICLE ORGANIZATION1 (APO1), a gene previously reported to control panicle structure. A near-isogenic line carrying SCM2 showed enhanced culm strength and increased spikelet number because of the pleiotropic effects of the gene. Although SCM2 is a gain-of-function mutant of APO1, it does not have the negative effects reported for APO1 overexpression mutants, such as decreased panicle number and abnormal spikelet morphology. The identification of lodging-resistance genes by QTL analysis combined with positional cloning is a useful approach for improving lodging resistance and overall productivity in rice.
Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
Taiichiro
T
Ookawa
Tokunori
T
Hobo
Masahiro
M
Yano
Kazumasa
K
Murata
Tsuyu
T
Ando
Hiroko
H
Miura
Kenji
K
Asano
Yusuke
Y
Ochiai
Mayuko
M
Ikeda
Ryoichi
R
Nishitani
Takeshi
T
Ebitani
Hidenobu
H
Ozaki
Enrique R
ER
Angeles
Tadashi
T
Hirasawa
Makoto
M
Matsuoka