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- W2012744897 abstract "Anthocyanin synthesis and hypocotyl growth have been studied in tomato (Lycopersicon esculentum Mill.) seedlings of high pigment (hp) mutants, aurea (au) mutants deficient in the labile type of phytochrome, an auhp double mutant and wild types. The phytochrome controlled [red light (RL)/far-red light reversible] anthocyanin synthesis occurring in a 24 h dark period after a 12 h pretreatment with RL or blue light (BL) is similar in the hp mutant, whereas in the case of the wild type, pretreatment with BL is more effective than RL. When grown under continuous broad-band UV-A, BL and RL for 5 d the au and auhp double mutants only accumulate low levels of anthocyanin compared to the wild type and the hp mutant. Under these conditions the hp mutant accumulates the highest levels of anthocyanin, but the relative effectiveness of RL and BL in the hp mutant and the wild type is reversed (BL being more effective than RL in wild type, whereas in the hp mutant RL is more effective than BL). These results suggest that the hp mutation enables maximal anthocyanin synthesis to be achieved without activation of the BL photoreceptor. When grown for 7 d in a regime of 14 h white light/10 h darkness the activation of anthocyanin synthesis is reduced in the au and auhp mutants compared to the wild type and the hp mutant. After the same treatment, the hypocotyls of hp-mutant seedlings of each cultivar are similar in length to those of their corresponding wild types and those of the au and auhp mutants are longer. However, after 5 d continuous low fluence rate (3 μ-tmol m-2 s-1) UV-A, BL and RL, the hypocotyl growth of the hp mutant is inhibited more than the wild type. The auhp double mutant shows a small but significantly higher anthocyanin accumulation than the au mutant, as well as increased inhibition of hypocotyl growth. It is proposed that the hp mutation increases the sensitivity to the labile phytochrome pool." @default.
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- W2012744897 date "1989-08-01" @default.
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- W2012744897 title "High Pigment Mutants of Tomato Exhibit High Sensitivity for Phytochrome Action" @default.
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