Arid
DOI10.1023/B:PLSO.0000020971.66784.fc
Factors influencing seed dormancy and germination in sand, and seedling survival under desiccation, of Psammochloa villosa (Poaceae), inhabiting the moving sand dunes of Ordos, China
Huang, ZY; Dong, M; Gutterman, Y
通讯作者Gutterman, Y
来源期刊PLANT AND SOIL
ISSN0032-079X
EISSN1573-5036
出版年2004
卷号259期号:1-2页码:231-241
英文摘要

Psammochloa villosa (Trin.) Bor. (Poaceae), is distributed primarily in moving sand dunes of the Ordos Plateau, China. Freshly harvested caryopses (seeds) are in non-deep physiological dormancy (non-deep PD). Germination is slow and low and only over a narrow temperature range. A treatment of four weeks cold stratification at 3 to 5degreesC in darkness was required to break non-deep PD, allowing germination to reach high percentages at higher temperatures and without light requirement. Rate and percentages of germination were increased by scarifying the caryopsis coat and by artificial removal of different proportions of the endosperm. However, seedling dry weight and increases in root and shoot lengths, were significantly influenced by the proportion of the endosperm that remained on the caryopses. Higher percentages of seedling emergence were obtained from the shallowly buried caryopses, ranging from 0.5-2.0 cm, and the depth of the caryopses in the sand affected the time of germination. The deeper the caryopses were buried, the more that remained ungerminated and in enforced dormancy. The caryopses germinated when the upper sand layer was removed and buried caryopses were at a suitable sand depth for germination, or when the sand was aerated. In natural habitats, germinated seedlings may be wholly exposed to the air by sand erosion and thus be exposed to drought stress. However, young seedlings have the ability to tolerate desiccation and to recover after rehydration. Root length at the ’point of no return’ is 4 mm.


英文关键词germination at sand depths non-deep physiological dormancy rehydration removal of endosperm scarification seedling desiccation tolerance
类型Article
语种英语
国家Israel ; Peoples R China
收录类别SCI-E
WOS记录号WOS:000220405600023
WOS关键词AEGILOPS-OVATA L ; AGROPYRON-PSAMMOPHILUM ; DROUGHT TOLERANCE ; PANICUM-VIRGATUM ; NEGEV DESERT ; CARYOPSES ; ISRAEL ; ENDOSPERM ; EMERGENCE ; BURIAL
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
来源机构中国科学院植物研究所 ; Ben-Gurion University of the Negev
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/147853
作者单位(1)Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Wyler Dept Drylands Agr, IL-84990 Midreshet Ben Gurion, Israel;(2)Ben Gurion Univ Negev, Dept Life Sci, IL-84990 Midreshet Ben Gurion, Israel;(3)Chinese Acad Sci, Inst Bot, Lab Quantitat Vegetat Ecol, Beijing 100093, Peoples R China
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Huang, ZY,Dong, M,Gutterman, Y. Factors influencing seed dormancy and germination in sand, and seedling survival under desiccation, of Psammochloa villosa (Poaceae), inhabiting the moving sand dunes of Ordos, China[J]. 中国科学院植物研究所, Ben-Gurion University of the Negev,2004,259(1-2):231-241.
APA Huang, ZY,Dong, M,&Gutterman, Y.(2004).Factors influencing seed dormancy and germination in sand, and seedling survival under desiccation, of Psammochloa villosa (Poaceae), inhabiting the moving sand dunes of Ordos, China.PLANT AND SOIL,259(1-2),231-241.
MLA Huang, ZY,et al."Factors influencing seed dormancy and germination in sand, and seedling survival under desiccation, of Psammochloa villosa (Poaceae), inhabiting the moving sand dunes of Ordos, China".PLANT AND SOIL 259.1-2(2004):231-241.
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