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Seedling desiccation tolerance of Leymus racemosus (Poaceae) (wild rye), a perennial sand-dune grass inhabiting the Junggar Basin of Xinjiang, China

Published online by Cambridge University Press:  22 February 2007

Zhenying Huang  and
Yitzchak Gutterman
Zhenying Huang
Affiliation:
Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Sciences, Beijing, 100093, P. R. China Wyler Department of Drylands Agriculture, Jacob Blaustein Institute for Desert Research and Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, 84990, Israel
Yitzchak Gutterman*
Affiliation:
Wyler Department of Drylands Agriculture, Jacob Blaustein Institute for Desert Research and Department of Life Sciences, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, 84990, Israel
*
*Correspondence Fax: +972 8659 6757, Email: [email protected]
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Abstract

Leymus Racemosus, The Mammoth Wild Rye, Is A Rhizomatous Perennial Grass, Mainly Distributed In The Moving Or Semi-Stabilized Sand Dunes In Deserts Of The Junggar Basin In Xinjiang, China. The Revival Ability Of The Young Seedling After Periods Of Desiccation Can Be Influenced By Several Factors: (1) The Stage Of Seedling Development – The Later The Stage At Dehydration, The Longer The Root Length And The Lower Is The Percentage Of Seedlings That Survive; (2) The Length Of The Period Of Desiccation – The Longer The Period That The Seedlings Are Under Desiccation, The Lower Is The Percentage Of Seedlings That Survive; (3) Endosperm Size – The Smaller The Proportion Of Endosperm That Remains In The Caryopses, The Lower Is The Percentage Of Seedlings That Revive, Determined By (A) The Stage Of Seedling Development, And (B) The Proportion Of The Endosperm That Is Removed By Cutting; And (4) Caryopsis Size – The Larger The Polymorphic Caryopses, The Higher Is The Percentage Of Young Seedlings That Revive From Periods Of Desiccation. The Physiological And Ecological Implications Of L. Racemosus Seedling Desiccation Tolerance Are That Under Extreme Desert And Unpredictable Environmental Conditions, The Chances Of Seedling Establishment Are Increased.

Keywords

caryopsis sizedesiccation toleranceendosperm; extreme desertLeymus racemosussand duneseedling developmental stage
Type
Research Article
Information
Seed Science Research , Volume 14 , Issue 2 , May 2004 , pp. 233 - 239
Copyright
Copyright © Cambridge University Press 2004

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