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Rice transgenic plants with suppressed expression of the ß subunit of the heterotrimeric G protein.

Utsunomiya, Yuzuko; Samejima, Chihiro; Fujisawa, Yukiko; Kato, Hisaharu; Iwasaki, Yukimoto.
Plant Signal Behav; 7(4): 443-6, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22499179
The deficient mutant for the rice heterotrimeric G protein α subunit gene (RGA1), d1, showed dwarfism and set small seed due to a reduced cell number. Mutants for the rice heterotrimeric G protein ß subunit gene (RGB1) have not been isolated. To determine the functions of RGB1, transgenic rice plants with suppressed expression of RGB1 were studied using the RNAi method. RGB1 knock-down lines showed browning of the lamina joint regions and nodes and reduced fertility, but these abnormality were not observed in d1. Transgenic plants in which the G protein ß subunit was greatly decreased were not obtained, suggesting that the complete suppression of RGB1 mRNA may be lethal. In contrast, the d1 mutants, with complete loss of the G protein α subunit, were fertile and half the size of the WT. These studies suggest that RGB1 has different functions than RGA1.
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