Nitrate assimilation in leaf blades of wheat of different age

A field experiment on wheat (Triticum aestivum L.) ev. Shera grown at 120 kg N ha -1 was conducted. Half of the dose of fertilizer N was applied at the pre-sowing stage and the other half when the seedlings were one month old. The leaf blades were examined for their NO 3 - content and NO 3 - assimilatory activity at various stages of growth and development. Soil nitrate level at 50 cm depth was determined throughout the wheat growing season in terms of cencentration (µg/ml) and total amount (kg ha -1 ). The upper leaf blades were examined for their capacity to assimilate NO 3 - . Highly significant correlation between NR (nitrate reductase) activity and NO 3 - content in the leaf blades. NR activity and soil NO 3 - , and between soil NO 3 - and leaf blade NO 3 - was observed. Findings on low soil NO 3 - status during the reproductive phase and the capacity of the upper leaf blades to assimilate additional amounts of NO 3 - , point to the need for developing a programme of soil fertilizer application whereby all the leaf blades can utilize the NO 3 - optimally and thus result in greater N harvest.

[1]  Y. P. Abrol,et al.  Physiological studies on the leaf blades of wheat (Triticum aestivum L.) in relation to nitrate assimilation and grain protein accumulation , 1979, The Journal of Agricultural Science.

[2]  Y. P. Abrol,et al.  Nitrogen metabolism of the upper three leaf blades of wheat at different soil nitrogen levels II. Protease activity and mobilization of reduced nitrogen to the developing grains , 1978 .

[3]  Y. P. Abrol,et al.  Studies on Nitrate Reducing System in Developing Wheat Ears 1 , 1977 .

[4]  R. Loyn,et al.  Level of activity of nitrate reductase at the seedling stage as a predictor of grain nitrogen yield in wheat (Triticum aestivum L.) , 1977 .

[5]  J. Boyer,et al.  Nitrate Reductase Activity in Maize (Zea mays L.) Leaves: I. Regulation by Nitrate Flux. , 1976, Plant physiology.

[6]  C. Johnson,et al.  Nitrate reductase as a possible predictive test of crop yield , 1976, Nature.

[7]  R. Hageman,et al.  Nitrate Reductase Activity and its Relationship to Accumulation of Vegetative and Grain Nitrogen in Wheat (Triticum aestivum L.) 1 , 1973 .

[8]  L. I. Croy,et al.  Protease and nitrate reductase seasonal patterns and their relation to grain protein production of high vs. low protein wheat varieties , 1972 .

[9]  R. Hageman,et al.  Generation of reduced nicotinamide adenine dinucleotide for nitrate reduction in green leaves. , 1971, Plant physiology.

[10]  L. I. Croy,et al.  Relationship of Nitrate Reductase Activity to Grain Protein Production in Wheat 1 , 1970 .

[11]  C. FJenner.  Synthesis of Starch in Detached Ears of Wheat , 1968 .

[12]  M. Fried,et al.  Characterizing the NO3 and NH4 Uptake Process of Rice Roots by Use of 15N Labelled NH4NO3 , 1965 .

[13]  M. Fishman,et al.  Diazotization Method for Nitrate and Nitrite , 1964 .

[14]  H. Evans,et al.  Pyridine Nucleotide-Nitrate Reductase from Extracts of Higher Plants. , 1953, Plant physiology.

[15]  D. R. Hoagland,et al.  The Water-Culture Method for Growing Plants Without Soil , 2018 .