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| 准噶尔荒漠异苞滨藜(Atriplex micrantha)的种子二型性及其萌发行为 | |
| 其他题名 | Seed dimorphism and germination behavior of Atriplex micrantha,an annual inhabiting Junggar desert |
| 刘鹏伟; 魏岩 | |
| ISSN | 1000-0933 |
| 出版年 | 2007 |
| 卷号 | 27期号:10页码:4233-4239 |
| 中文摘要 | 异苞滨藜的果实(种子)存在二型性,这两种类型的果实在形状、大小、颜色及包被其苞片的大小上均有差异.黑色果实果皮光滑,有光泽,直径1.481mm0.186 mm,包被果实的苞片较小;褐色果实扁平,直径2.642mm0.254 mm,包被果实的苞片较大.以异苞滨藜的两种果实(种子)为材料,在3个变温条件(5/25 ℃、5/15 ℃、15/25 ℃, 暗12 h /光12 h)下进行萌发实验,褐色种子成熟后即具有一定的萌发能力,最终萌发率都在80% 以上.黑色种子仅在低的夜间温度(5 ℃)和高的昼间温度(25 ℃)条件下有较高的萌发率(＞70%),而在5/15 ℃、15/25 ℃条件下,种子的最终萌发率较低(＜20%),2星期的低温层积处理能够有效地加速和提高黑色种子在3个变温条件下的萌发,划破果皮和种皮也能不同程度的加速和促进黑色种子的萌发,表明黑色种子处于非深度生理休眠状态.苞片中盐含量低,苞片对褐色种子萌发无抑制作用.异苞滨藜的果实(种子)二型性及其萌发行为是对荒漠异质环境的适应. |
| 英文摘要 | The fruit and seed characteristics were observed on Atriplex micrantha C. A. Mey. from Junggar desert.It is found the fruits of Atriplex micrantha have dimorphism. It has two types of fruits that are different in shape,size,color of seeds and size of bracts attached fruits.Small, black, lens-shaped achenes with a glossy, smooth testa are covered by extended bracteoles. Brown achenes are rather large and covered by extended bracteoles that are bigger. The fruits (seeds) of Atriplex micrantha were germinated for 15 d in incubators with a 12 h photoperiod and 12 h thermoperiods (dark/light) of 5/15 ℃, 5/25 ℃ and 15/25 ℃. The mature brown seed can germinate in the 3 thermoperiods, and the germination percentage and germination rate of seeds is the highest at 5/25 ℃ (dark/light). Low night (5 ℃) and high day (25 ℃) temperature regimes showed higher germination for black seeds, while at 5/15 ℃ and 15/25 ℃ , germination percentage was low (<20%). Black seeds have non-deep physiological dormancy; they germinate slowly and to a low percentage. Two weeks of cold stratification, scarification of covering layers (pericarp and seed coat) can increase seed germination percentage and germination rate. The salt concentration in bracteoles of freshly ripened fruits is too low to mediate an inhibitory effect on germination of brown seed. Seed dimorphism may allow Atriplex micrantha to survive in harsh desert habitats. |
| 中文关键词 | 异苞滨藜 ; 种子二型性 ; 萌发行为 ; 非深度生理休眠 ; 苞片 |
| 英文关键词 | Atriplex micrantha C. A. Mey. seed dimorphism germination behavior non-deep physiological dormancy bracteoles |
| 语种 | 中文 |
| 国家 | 中国 |
| 收录类别 | CSCD |
| WOS类目 | ECOLOGY |
| WOS研究方向 | Environmental Sciences & Ecology |
| CSCD记录号 | CSCD:2937154 |
| 来源机构 | 新疆农业大学 |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/221356 |
| 作者单位 | 新疆农业大学林学院, 乌鲁木齐, 新疆 830052, 中国 |
| 推荐引用方式 GB/T 7714 | 刘鹏伟,魏岩. 准噶尔荒漠异苞滨藜(Atriplex micrantha)的种子二型性及其萌发行为[J]. 新疆农业大学,2007,27(10):4233-4239. |
| APA | 刘鹏伟,&魏岩.(2007).准噶尔荒漠异苞滨藜(Atriplex micrantha)的种子二型性及其萌发行为.,27(10),4233-4239. |
| MLA | 刘鹏伟,et al."准噶尔荒漠异苞滨藜(Atriplex micrantha)的种子二型性及其萌发行为".27.10(2007):4233-4239. |
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