Brassinosteroid biosynthesis and inactivation

For MTT assays, cells (2,000 ~ 5,000 cells/well) were subcultured into 96-well plates according to their growth properties. Cell proliferation was assayed at 72 hr after treatment of CHIR-99021 by adding 20 μl of 5 mg/ml 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) solution per 100 μl of growth medium. After incubating for 3-4 h at 37°C, the media were removed and 150 µl/well of MTT solvent (either absolute DMSO or isopropanol containing 4 mM HCl and % Nonidet-40) was added to dissolve the formazan. The absorbance of each well was measured by ELx808 (BioTek, Winooski, VT) or Wallac Victor2 (Perkin-Elmer Life Sciences, Boston, MA) Microplate Reader. Viable cells are presented as percent of control, vehicle-treated cells. 

Seed treatment is a useful practice for healthy plant growth. Seed priming through controlled hydration and dehydration enhances early germination of mustard seed in less time, even in compacted soil [ 8 ]. The soaking of mustard seeds in % aqueous pyridoxine hydrochloride solution for 4 hours improved germination. The combination of pyridoxine + N 60 P 20 + N 15 P 5 (top dressing) accelerated the crop performance by enhancing seed yield and oil yield by and %, respectively, over the control [ 9 ]. The differential response of varieties for imbibition gives advantage to some of them to germinate early as compared to others. At Hisar, maximum rate of imbibition was reported in “NRCDR-2” (%) and minimum in “NRCDR-509” (%). Such drastic difference in rate of imbibition is important for identification of suitable varieties under abiotic stress conditions namely drought, frost, and temperature abnormalities.

Seed germination performance is a major determinant of crop yield. Deterioration of seed quality with age is associated with accumulation of DNA damage . [6] In dry, aging rye seeds, DNA damages occur with loss of viability of embryos. [7] Dry seeds of Vicia faba accumulate DNA damage with time in storage, and undergo DNA repair upon germination. [8] In Arabidopsis , a DNA ligase is employed in repair of DNA single- and double-strand breaks during seed germination and this ligase is an important determinant of seed longevity. [9] In eukaryotes , the cellular repair response to DNA damage is orchestrated, in part, by the DNA damage checkpoint kinase ATM . ATM has a major role in controlling germination of aged seeds by integrating progression through germination with the repair response to DNA damages accumulated during the dry quiescent state. [10]

Brassinosteroid biosynthesis and inactivation

brassinosteroid biosynthesis and inactivation


brassinosteroid biosynthesis and inactivationbrassinosteroid biosynthesis and inactivationbrassinosteroid biosynthesis and inactivationbrassinosteroid biosynthesis and inactivationbrassinosteroid biosynthesis and inactivation