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- W2014569884 abstract "Stem elongation can be suppressed by a temperature drop at the onset of the photoperiod (DROP) or with a cooler day than night temperature (DT and NT, respectively), commonly described as DIF (DT - NT). To test our hypothesis that phytochrome A (phyA) mediated the reduction of stem elongation caused by −DIF and DROP, we conducted experiments with photomorphogenic mutants of tomato (Solarium lycopersicon L.) and transgenic potato (Solarium tuberosum L.). The plants studied were tomato mutants fri1 (deficient in phyA) and tri3 (deficient in phytochrome B1 [phyBl]) and their isogenic wild-type (WT) cv. Moneymaker, nontransformed potato, and two lines each of antisense phyA (15-9 and 15-11) and overexpressed phyA (PS-2 and PS-4). Plants were placed in three temperature regimens with a daily mean of 20°C: a constant 20°C (0 DIF), an 8°C DROP for 3 h, and a - 8°C DIF. For all tomato genotypes, −DIF and DROP reduced intemode length by ≥ 21% and stem elongation by 30% compared to that of plants at 0 DIF. Interactions between temperature treatment and genotype were nonsignificant. For potato, −DIF, but not DROP, significantly reduced intemode length of WT (by 39%) and both antisense lines (by 36 or 48%) but only one of the two lines of overexpressed phyA plants (by 18%). The −DIF significantly reduced stem length for only antisense phyA (by 36 or 48%) and WT (by 35%) plants. Thus, at least for tomato and potato, it appears that phyA does not control stem extension in relation to cool-temperature treatments." @default.
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- W2014569884 date "1998-12-01" @default.
- W2014569884 modified "2023-10-17" @default.
- W2014569884 title "Phytochrome A does not mediate reduced stem extension from cool day-temperature treatments" @default.
- W2014569884 doi "https://doi.org/10.1034/j.1399-3054.1998.1040411.x" @default.
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