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Truong, Hai An,Lee, Won Je,Jeong, Chan Young,Trị,nh, Cao Sx1a1,n,Lee, Seokjin,Kang, Chon-Sik,Cheong, Young-Keun,Hong, Suk-Whan,Lee, Hojoung Elsevier 2018 Journal of plant physiology Vol.231 No.-
<P><B>Abstract</B></P> <P>Plants require nitrogen (N) for growth and development. However, they are frequently exposed to conditions of nitrogen deficiency. In addition, anthocyanin accumulation is induced under salt stress and nitrate deficiency. To date, most studies have revealed that nitrate deficiency under high sucrose levels induce high levels of anthocyanin accumulation in plants. However, the underlying mechanisms remain unclear. Under nitrate-starved conditions, plant growth rapidly worsens and cells eventually die. In addition, plants are severely affected by salt exposure. Therefore, in this study, we determined whether increased levels of anthocyanin could improve plant growth under salt stress and nitrate-starved conditions. We used <I>PAP1-D/fls1ko</I> and <I>ttg1</I> plants which have a perturbed anthocyanin biosynthesis pathway to explore the role of anthocyanin in plant adaptation to nitrate-deficient conditions and salt stress. Our results demonstrate that high anthocyanin accumulation in <I>PAP1-D/fls1ko</I> plants confers enhanced tolerance to nitrate-deficient conditions combined with high salinity. <I>PAP1-D/fls1ko</I> plants appeared to use absorbed nitrate efficiently during the nitrate reduction process. In addition, nitrate-related genes such as <I>NRT1.1, NiA1</I> and <I>NiA</I>2 were upregulated in the <I>PAP1-D/fls1ko</I> plants. On the basis of these findings, it can be concluded that high anthocyanin accumulation helps plants to cope with salt stress under nitrate-deficient conditions via the effective utilization of nitrate metabolism.</P>