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Canopy and Seasonal Profiles of Nitrate Reductase Activity in Field Grown Grain Sorghum
Author(s) -
Pal U. R.,
Kununka J. M.
Publication year - 1987
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1987.tb00088.x
Subject(s) - sorghum , canopy , cultivar , sowing , nitrate reductase , agronomy , biology , growing season , sorghum bicolor , poaceae , field experiment , horticulture , nitrate , botany , ecology
Field experiments were conducted at the Livestock Research Centre of G.B. Pant University of Agriculture and Technology, Pantnager, India during wet season (June‐September) of 1978 with the objectives of characterizing canopy and seasonal profiles of in vivo nitrate reductase activity (NRA) of grain sorghum ( Sorghum bicolor [L.] Moench) cultivars. Canopy profile of NRA was studied on hybrid CSH 5 at 45, 55, 70, 80 and 95 days after sowing, whereas seasonal profile of NRA was studied in six sorghum cultivars — hybrid CSH 5 and pure line varieties CSV 4, SPV 100, SPV 101, SPV 103 and SPV 106 beginning at 30 days until 95 days after sowing. Canopy profile studies indicated that fully expanded recently matured leaves possessed higher levels of in vivo NRA than unexpanded immature as well as older leaves. Seasonal profiles of in vivo NRA showed different trends in different cultivars. Cultivars SPV 100, SPV 101, SPV 103 and SPV 106 demonstrated two peaks of in vivo NRA/plant/day at 44 and 95 days. On the other hand, hybrid CSH‐5 had only one peak at 51 days and cultivar CSV 4 had none.