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Seed germination response to high temperature and water stress in three invasive Asteraceae weeds from Xishuangbanna, SW China
Yuan, Xia; Wen, Bin
2018
Source PublicationPLOS ONE
ISSN1932-6203
Volume13Issue:1Pages:-
AbstractCrassocephalum crepidioides, Conyza canadensis, and Ageratum conyzoides are alien annuals naturalized in China, which produce a large number of viable seeds every year. They widely grow in Xishuangbanna, becoming troublesome weeds that compete with crops for water and nutrients. As seed germination is among the most important life-stages which contribute to plant distribution and invasiveness, its adaptation to temperature and water stress were investigated in these three species. Results showed that: (1) These three species have wide temperature ranges to allow seed germination, i.e., high germination and seedling percentages were achieved between 15 degrees C and 30 degrees C, but germination was seriously inhibited at 35 degrees C; only A. conyzoides demonstrated relative preference for warmer temperatures with approximately 25% germination and seedling percentage at 35 degrees C; (2) light was a vital germination prerequisite for C. crepidioides and A. conyzoides, whereas most C. canadensis seeds germinated in full darkness; (3) Although all three species have good adaptation to bare ground habitat characterized by high temperatures and water stress, including their tolerance to soil surface temperatures of 70 E C in air-dried seeds, A. conyzoides seeds exhibited higher tolerance to both continuous and daily periodic high-temperature treatment at 40 E C, and to water restriction (e.g., ca. 65% seeds germinated to -0.8 MPa created by NaCl), which is consistent with their field behavior in Xishuangbanna. This study suggests that seed high-temperature tolerance contributes to the weed attributes of these three species, and that adaptation to local micro-habitats is a critical determinant for invasiveness of an alien plant.
Department其他
KeywordAgeratum-conyzoides L. Horseweed Conyza-canadensis Ecology Saflufenacil Potentials Emergence Plant
Subject AreaScience & Technology - Other Topics
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/10802
Collection支撑系统
Recommended Citation
GB/T 7714
Yuan, Xia,Wen, Bin. Seed germination response to high temperature and water stress in three invasive Asteraceae weeds from Xishuangbanna, SW China[J]. PLOS ONE,2018,13(1):-.
APA Yuan, Xia,&Wen, Bin.(2018).Seed germination response to high temperature and water stress in three invasive Asteraceae weeds from Xishuangbanna, SW China.PLOS ONE,13(1),-.
MLA Yuan, Xia,et al."Seed germination response to high temperature and water stress in three invasive Asteraceae weeds from Xishuangbanna, SW China".PLOS ONE 13.1(2018):-.
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