Lower carotenoid accumulation under high temperature was probably attributed to transcriptional down-regulation of the biosynthesis gene OfPSY1, OfZ-ISO1 and OfLCYB1, and up-regulation of degradation genes OfNCED3, OfCCD1-1, OfCCD1-2, and OfCCD4-1. Total carotenoid content and the content of individual carotenoids (α-carotene, β-carotene, α-cryptoxanthin, β-cryptoxanthin, lutein and zeaxanthin) were inhibited by high temperature, but were enhanced by low temperature.
The floral color, carotenoid content, and the expression level of carotenoid-related genes in petals of sweet osmanthus ‘Jinqiu Gui’ under different temperature treatments were investigated.Ĭompared to the control (19 ☌), high temperature (32 ☌) changed the floral color from yellow to yellowish-white with higher lightness ( L *) value and lower redness ( a *) value, while low temperature (15 ☌) turned the floral color from yellow to pale orange with decreased L * value and increased a * value. Here, to reveal how temperature regulates the floral color of sweet osmanthus, potted sweet osmanthus ‘Jinqiu Gui’ were treated by different temperatures (15 ☌, 19 ☌ or 32 ☌). The floral color of sweet osmanthus ( Osmanthus fragrans Lour.) which is mainly contributed by carotenoid content, is affected by temperature in autumn.
Temperature is involved in the regulation of carotenoid accumulation in many plants. We propose that temperature-induced reduction of anthocyanin accumulation in potato flesh is caused by down-regulation of the activating anthocyanin regulatory complex, by enhancing the expression of flesh-specific StMYB44 and alteration of phenylpropanoid flux. StMYB44-1 conferred repression without a requirement for a basic helix-loop-helix (bHLH) partner, suggesting a different repression mechanism from that of reported anthocyanin repressors. StMYB44-1 showed stronger repressive capacity than StMYB44-2, with both predicted proteins containing the repression-associated EAR motif with some variation. benthamiana by directly suppressing the activity of the dihydroflavonol reductase (DFR) promoter. In transient assays, StMYB44 represses anthocyanin accumulation in leaves of Nicotiana tabacum and N. Two R2R3 MYB TFs, StMYB44-1 and StMYB44-2, were highly expressed in white regions under high temperature. However, the core phenylpropanoid pathway, lignin, and chlorogenic acid (CGA) pathway genes were up-regulated in white areas, suggesting that suppression of the anthocyanin branch may result in re-routing phenylpropanoid flux into the CGA or lignin biosynthesis branches.
#Olympus dss player pro install error 1935 skin#
Heat stress reduced the expression of the R2R3 MYB transcription factors (TFs) StAN1 and StbHLH1, members of the transcriptional complex responsible for coordinated regulation of the skin and flesh pigmentation, as well as anthocyanin biosynthetic pathway genes in white regions.
Here we show that high temperature causes reduction of anthocyanin biosynthesis in both potato tuber skin and flesh, with white areas forming between the vasculature and periderm. However, the mechanism of anthocyanin biosynthesis in potato tuber under heat stress remains unknown. In potato (Solanum tuberosum L.), high temperature significantly reduces tuber anthocyanin pigment content. High temperatures are known to reduce anthocyanin accumulation in a number of diverse plant species.
0 kommentar(er)
