Biologia plantarum 44:373-378, 2001 | DOI: 10.1023/A:1012494726966
Responses of Penultimate and Flag Leaves of Wheat to Different Nitrogen Supply
- 1 Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi-, India
Uniculm wheat (Triticum aestivum L.) was grown to maturity at four concentrations of nitrogen corresponding to 3 (N1), 6 (N2), 9 (N3) and 12 (N4) g m-2. Penultimate and flag leaves were examined throughout the ontogeny. Sub-optimal concentrations of N resulted in sharp decline in both area and dry mass of the leaves. Decline in leaf area was due to fewer mesophyll cells. Net photosynthetic rate (PN) increased up to full expansion, remained constant for about a week and then declined. PN, nitrogen, ribulose-1,5-bis-phosphate carboxylase/oxygenase (RuBPCO) amount and activity, chlorophyll and soluble protein contents were similar at all the N concentrations. Both amount and activity of RuBPCO in the flag leaf were about two fold higher as compared to penultimate leaf, but PN was similar. This indicates the presence of an excess amount of RuBPCO in the flag leaf.
Keywords: chlorophyll; photosynthesis; ribulose-1,5-bisphosphate carboxylase, oxygenase; soluble proteins
Subjects: chlorophylls, leaf ontogeny; leaf ontogeny, photosynthesis, nitrogen supply, wheat; nitrate supply, photosynthesis; ontogeny of leaf, photosynthesis; ribulose-1,5-bisphosphate carboxylase/oxygenase, leaf ontogeny, nitrogen supply; tricarboxylic acid; Triticum aestivum; wheat
Published: September 1, 2001Show citation
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