Effect of Drought Stress on Nitrogen Components in Corn

An attempt was made to study of nitrogen components response of corn (Zea mays L.) to drought stress. A farm research was done in RCBD as split-plot with four replications in Khorramabad, west Iran. Drought stress levels as irrigation regimes after 75 (control), 100, and 120 (stress) mm cumulative evaporation were in main plots, and four seed corn varieties include 500 (medium maturity), 647, 700, and 704 (long maturity) were as subplots. Soluble protein, nitrate and proline amino acid were measured in shoot and root at flowering stage, and grain yield was measured in harvesting stage. As the drought progressed, the amount of nitrate and proline followed an increasing trend, but soluble protein decreased in shoot and root. The highest amount of nitrate and proline was observed in longer maturity varieties than shorter ones, but decrease yield of long maturity varieties was higher than medium maturity varieties in drought condition, because of long duration of stress.

Authors:

• Masoud Rafiee
• Fatemeh Abdipoor
• Hosain Lari

Keywords:

• Nitrate
• Proline
• Soluble protein
• Yield

References:

[1] Agrigold Agronomy team, "Effects of drought conditions on growth
development", 2005, Available from:
http://www.agrigold.com/files/Effect%of%20Drought%20Conditions%2
0on%20Corn%20development.pdf.
[2] R. W. Heinigre, "Irrigation and Drought management. Crop Science
Department", 2000, Available from:
http://www.ces.ncsu.edu/plymouth/cropsci/cornguide/Chapter4.html.
[3] O. R. Krieg, "Photosynthetic activity during stress". E.g.r water
managing, vol. 1, pp. 249-263, 1983.
[4] G. Knipp, and B. Honermeier, "Effect of water stress on praline
accumulation of genetically modified potatoes (solanum tuberosum l.)
generating fructans", J. of Plant Physiology. vol. 163, no. 4, pp. 392-
397, 2006.
[5] J. Lauer, "What happens within the corn plant when drought occurs.
University of Wisconsin Extension", 2003, Available from:
http://www.uwex.edu/ces/ag/issues/drougt2003/corneffect.html.
[6] J. P. Martinez, S. Lutts, A. Schanck, M. Bajji, and J-M. Kinet, "Is
osmatic adjustment required for water stress resistance in the
Mediterranean shrub Atriplex halimus L.?" J. Of Plant Physiology, vol.
161, pp. 1041-1051, 2004.
[7] C. Pinheiro, j.a. Passarinho, and c.p. Ricardo, "effect of drought and
rewatering on the metabolism of lupinus albus organs". J. Of plant
physiology. Vol. 161, no. 11, pp. 1203-1210, 2004.