4.7 Article

A morpho-physiological approach differentiates bread wheat cultivars of contrasting tolerance under cyclic water stress

期刊

JOURNAL OF PLANT PHYSIOLOGY
卷 171, 期 14, 页码 1256-1266

出版社

ELSEVIER GMBH
DOI: 10.1016/j.jplph.2014.04.013

关键词

Wheat (Triticum aestivum L.); Drought tolerance; Cuticle; Cellular integrity; Stomatal density

资金

  1. National Development Agency of Hungary [TAMOP 4.2.1/B-09/1/KMR/-2010-0005, NKTH-OTKA CK80211, NKTH-OTKA CK80274]
  2. Bolyai Janos Research Scholarship of the Hungarian Academy of Sciences [00044/11]
  3. Doctoral Council of Life Sciences of Corvinus University of Budapest

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Leaf micromorphological traits and some physiological parameters with potential relevance to drought tolerance mechanisms were investigated in four selected winter wheat varieties. Plants were subjected to two cycles of drought treatment at anthesis. Yield components confirmed contrasting drought-sensitive and -tolerant behavior of the genotypes. Drought tolerance was associated with small flag leaf surfaces and less frequent occurrence of stomata. Substantial variation of leaf cuticular thickness was found among the cultivars. Thin cuticle coincided with drought sensitivity and correlated with a high rate of dark-adapted water loss from leaves. Unlike in Arabidopsis, thickening of the cuticular matrix in response to water deprivation did not occur. Water stress induced epicuticular wax crystal depositions preferentially on the abaxial leaf surfaces. According to microscopy and electrolyte leakage measurements from leaf tissues, membrane integrity was lost earlier or to a higher extent in sensitive than in tolerant genotypes. Cellular damage and a decline of relative water content of leaves in sensitive cultivars became distinctive during the second cycle of water deprivation. Our results indicate strong variation of traits with potential contribution to the complex phenotype of drought tolerance in wheat genotypes. The maintained membrane integrity and relative water content values during repeated water limited periods were found to correlate with drought tolerance in the selection of cultivars investigated. (C) 2014 Elsevier GmbH. All rights reserved.

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