UV-B IRRADIANCE INDUCED DELETERIOUS EFFECTS ON THE NET PRIMARY PRODUCTIVITY AND COUNTERACTED BY SOME PLANT GROWTH REGULATORS (PGRs), IN BRASSICA COMPESTRIS PT-303 (BROWN SARSON)
Sanjeev Lal, G.K. Dhingral, S. Sharmal, P. pokhriyall, R. Dasl, A. Guptal, S. Kuriyall
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The aim of present study to be evaluated the appropriate concentrations of plant growth regulators i.e. (10-7) to (10-5 M) over UV-B damage on Brassica compestris PT-303. Seeds of Brassica compestris PT- 303 (Brown sarson) were sown in sandy loam soil in field plots (A, B, C, D and E). Plot-A of mustard crop was treated as control and neither sprayed with growth regulators nor exposed to UV-B radiation. Pot-B was treated with UV-B radiation (3-hrs. daily) only. Plot-C was sprayed with IAA solution of (10-7 M), Plot D was sprayed with Kn solution of (10-5 M) and plot-E was sprayed with solutions of GA3 (10-6 M) concentration daily, along with UV-B radiation in Brassica compestris PT-303. It was observed that IAA was found most effective in (10-7 M), Kn in (10-5 M) and GA3 in (10-6 M) in crop of Brassica compestris PT- 303 respectively. Therefore, for the field studies, only these concentrations were taken to assess for the studies of net primary productivity of Brassica compestris PT-303 (Brown sarson).