Effect of potassium on growth and nitrate reductase during water stress and recovery in maize

Khanna-Chopra, R. ; Chaturvedi, G. S. ; Aggarwal, P. K. ; Sinha, S. K. (1980) Effect of potassium on growth and nitrate reductase during water stress and recovery in maize Physiologia Plantarum, 49 (4). pp. 495-500. ISSN 0031-9317

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1399-...

Related URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb03340.x

Abstract

The effect of potassium (0,50, 100 and 200 mg/pot) was studied on growth characteristics and nitrate reductase activity in maize (Zea mays) seedlings during water stress and subsequent recovery. In irrigated plants K+ increased the rate of leaf area expansion, leading to increased leaf area per plant. Increased leaf area was associated with decreased chlorophyll content. Water stress (-15 bars) enhanced the stomatal resistance of leaves which was further accentuated by K+ application. Nitrate reductase activity rose in irrigated plants 24 h after K+ application. Subsequently, as water stress developed, K+ helped to maintain higher NR activity for the first two days. However, K+ had no effect on half life of NR in light or darkness. During recovery from stress K+ aided to maintain the higher leaf expansion rate, the chlorophyll content and the stomatal resistance. The results above are discussed in relation to the ability of K+ to maintain better growth under water stress.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Potassium; Water Potential; Nitrate Reductase
ID Code:35372
Deposited On:11 Apr 2011 12:50
Last Modified:11 Apr 2011 12:50

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