Abstract
Mutants of photosynthetic electron transport were screened using a chlorophyll fluorescence imaging system from Tos17-induced insertion mutants of rice (CV. Nipponbare). By analysis of chl fluorescence induction, 103 mutants, isolated from about 10,700 lines of Tos17-inserted mutants, were classified into high-Fo , no-quenching and slow-quenching types. High-Fo type may have a mutation in either overall gene expression in chloroplasts or oxidizing side of P680. No-quenching type may have a mutation in reducing side of P680, and could not grow further in photoautotrophic conditions due to very low quantum yield of photosystem II. Slow-quenching mutants may have mutation in either a component of the down stream chain of the electron transport or a regulatory factor associated with non-photochemical quenching of chl fluorescence. Molecular characterization of some mutants is on going.
