auxin response factor

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  • To determine whethe the increasedexpression of miR167 cause degradation of transcripts from ARFs,,, they measured the mRNA levels of the two ARFs by RT-PCR in transgenic lines and wild type plants. Comparison of mRNA levels of wild type and lines reveals degradation of ARF8 transcripts in transgenics although there was no such effect on ARF6 transcrpits.
  • To understand better the role of miR167 and functions of ARF6 & ARF8, they did phenotypic characterization of transgenic lines and compared it with wild type. Thus this miRNA affects the normal plant development and its physiology.
  • auxin response factor

    1. 1. Auxin response factor Presentation by : Satya Prakash Chaurasia Department of Botany, University of Delhi, satya.prakash101991@gmail.com www.facebook.com/91satya www.twitter.com/Satyapr101991 h ttp://www.linkedin.com/pub/satya-prakash chaurasia/65/a76/a25 Mob: +919654814497
    2. 2. RESULTS  Analysis of mRNA levels of ARF6 & ARF8  RT-PCR Conclusion:- miR167 can indeed reduce the level of ARF8, but not ARF6 transcripts, in transgenic plants that carried a 35S::MIR167b fusion.
    3. 3. Phenotypic analyses flowers Inflorescence stamens • • • siliques sepalss petals 8-day-old seedlings floral organs are arranged in the order of Col (left), the group I plant line-14 (center) and the group II plant line-17 (right) Bars =1 mm in (A), (B), (E), (F), and (G), and 0.5 mm in (C) and (D). (H) A total of 55 wild-type and 35 T2 line-23 plants were scored. Bars indicate standard error.
    4. 4. Analysis of floral organs by SEM • Petals of 3-week-old wild-type (A-C) and the T1 group I plants (line-6) (D-F). • (H) Filamentous epidermal cells of the wild type. Bars = 1 mm in (A) and (D); 50 μm in (B) and (E); 10 μm in (C) and (F); 0.5 mm in (G), (J). 20 μm in (H), (K), (N), and (Q); 0.2 mm in (I) and (L); and 100 μm in (O) and (Q).
    5. 5. Continue…… (M) A wild-type gynoecium. (N) A close-up of the boxed replum region in (M). (O) A close-up of the style in (M). (P) A line-6 gynoecium. (Q) A close-up of the boxed replum region in (P). (R) A close-up of the style in (P). Bars = 0.5 mm in (M), and (P); 20 μm in (N), and (Q); and 100 μm in (O) and (Q).
    6. 6. • Since group I 35S::MIR167b transgenic plants produced stamens with a short filament and an undehisced anther . These phenotypes provide explanations for the reduced fertility in the 35S:: MIR167b transgenic plants ( Nagpal et al.,2005). • To determine whether pollen grains of the 35S::MIR167b anther were functionally defective, they performed reciprocal crosses between wild-type and 35S::MIR167b plants. They also did pollen germination test in which they found that rate of germination was much lower in transgenics than that was in wild type
    7. 7. wild Line 14 Line 17

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