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  • 1 Colegio de Postgraduados Botánica and Fitopatología Km 35.5, Carretera México-Texcoco Montecillo México 56230
  • | 2 Universidad del Zulia Facultad de Agronomía Av. Ziruma, Núcleo Agropecuario Maracaibo Venezuela
  • | 3 UASLP Instituto de Investigación de Zonas Desérticas San Luis Potosí México. Altair 200, Col. del Llano San Luis Potosí S.L.P. México 78377
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The effect of substrate water potential (Ψ W ) in anatomical characteristics of root seedlings of maize Tuxpeño Sequía C0 (TSC0), drought sensitive, and Tuxpeño Sequía C8 (TSC8), drought resistant, were evaluated. Seventy two hours old seedlings, having an average root length of 5 cm, were maintained for 24 h in vermiculite at Ψ W of −0.03, −0.65, −1.48 and −2.35 MPa. Anatomical characteristics from both differentiation and cell division root regions were evaluated. Lowest Ψ W diminished significantly (P=0.0020) transverse root area, number of cells in the cortex parenchyma, thickness of epidermis, exodermis and cortex, and number of metaxylem vessels in both maize populations. Number of metaxylem vessels and cortex thickness was affected only in TSC0 (15% in both cases); in contrast, the number of cortex cells in the differentiation root region increased 25%, independently of the Ψ W , and the thickness of the xylem wall from the differentiation root region increased 93% at Ψ W of −2.35 MPa, in both maize populations. Results suggest that the recurrent selection for drought tolerance induced a significant thinning of the protoderm (78%), endodermis (17%), and xylem vessels (14%) in Tuxpeño maize root and modified the response of root to substrate Ψ W , including several anatomical changes.

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Cereal Research Communications
Language English
Size B5
Year of
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1973
Volumes
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1
Issues
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Founder Akadémiai Kiadó
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ISSN 0133-3720 (Print)
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