Salinity and the growth of non-halophytic grass leaves: the role of mineral nutrient distribution
Yuncai Hu A C , Wieland Fricke B and Urs Schmidhalter AA Chair of Plant Nutrition, Department of Plant Sciences, Technical University of Munich, D-85350 Freising, Germany.
B Division of Biology, University of Paisley, Paisley PA1 2BE, Scotland, UK.
C Corresponding author. Email: hu@wzw.tum.de
Functional Plant Biology 32(11) 973-985 https://doi.org/10.1071/FP05080
Submitted: 8 April 2005 Accepted: 27 July 2005 Published: 28 October 2005
Abstract
Salinity is increasingly limiting the production of graminaceous crops constituting the main sources of staple food (rice, wheat, barley, maize and sorghum), primarily through reductions in the expansion and photosynthetic yield of the leaves. In the present review, we summarise current knowledge of the characteristics of the spatial distribution patterns of the mineral elements along the growing grass leaf and of the impact of salinity on these patterns. Although mineral nutrients have a wide range of functions in plant tissues, their functions may differ between growing and non-growing parts of the grass leaf. To identify the physiological processes by which salinity affects leaf elongation in non-halophytic grasses, patterns of mineral nutrient deposition related to developmental and anatomical gradients along the growing grass leaf are discussed. The hypothesis that a causal link exists between ion deficiency and / or toxicity and the inhibition of leaf growth of grasses in a saline environment is tested.
Keywords: grasses, growth zone, leaves, mineral nutrients, net deposition rate, non-halophytes, salinity.
Acknowledgments
Research by Y Hu and U Schmidhalter is supported through the German Research Foundation (DFG). Research by W Fricke is supported through the Biotechnology and Biological Sciences Research Council (BBSRC), UK, the Royal Society of London and the Leverhulme Trust.
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