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Seed germination and seedling emergence of three Artemisia species (Asteraceae) inhabiting desert sand dunes in China

Published online by Cambridge University Press:  22 February 2007

Kazuo Tobe ,
Liping Zhang  and
Kenji Omasa
Kazuo Tobe*
Affiliation:
Laboratory of Intellectual Fundamentals for Environmental Studies, National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305–8506, Japan
Liping Zhang
Affiliation:
Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
Kenji Omasa
Affiliation:
Graduate School of Agricultural and Life Sciences, University of Tokyo, 1–1–1 Yayoi, Bunkyo, Tokyo 113–8657, Japan
*
*Correspondence: Fax: +81 29 850 2587, Email: [email protected]
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Abstract

Artemisia ordosica, A. arenaria and A. sphaerocephala are semi-shrubs inhabiting desert sand dunes in China and often used to rehabilitate desertified areas. Improvement of dune rehabilitation success by sowing requires better understanding of the processes involved in the control of seed germination and seedling emergence in these species. Thus, (1) effects of temperature, light and osmotica (polyethylene glycol-6000) on seed germination, and (2) effects of seed burial depth in sand and irrigation regime on seedling emergence, were studied under controlled conditions. Seeds of the three species required light for germination, and the light fluence needed for germination was dependent on temperature. Seedling emergence of the three species was maximal (70–94%) for seeds sown at a depth of 2.5 mm, and decreased with increasing seed burial depth when the pots were initially and subsequently treated with 16 mm and 3 mm irrigation at 1-d intervals. However, when the pots were initially and subsequently treated with 8 mm and 3 mm irrigation at 2-d intervals, seedling emergence was almost completely suppressed due to water deficiency in sand. It is suggested that the probability of seed germination and seedling emergence of the three species in the field is very limited, because the light requirement restricts seed germination to shallow sand layers where water is lost rapidly due to evaporation. Temperature appeared to have secondary effects on seed germination, by modifying the light sensitivity of seeds.

Keywords

Artemisia arenariaArtemisia ordosicaArtemisia sphaerocephalairrigationlightseed burial depthtemperature
Type
Research Article
Information
Seed Science Research , Volume 16 , Issue 1 , March 2006 , pp. 61 - 69
Copyright
Copyright © Cambridge University Press 2006

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