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首页> 外文期刊>Polar biology >Growing temperature affects seed germination of the antarctic plant Colobanthus quitensis (Kunth) Bartl (Caryophyllaceae)
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Growing temperature affects seed germination of the antarctic plant Colobanthus quitensis (Kunth) Bartl (Caryophyllaceae)

机译：生长温度影响南极植物Colobanthus quitensis（Kunth）Bartl（石竹科）的种子发芽

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摘要

Increases in populations of the two native higher plants that exist in the Antarctic have been thought to be caused by an improvement in their reproductive performance as a result of regional warming. Colobanthus quitensis dispersion by seeds and establishment are limited to years with sufficiently high summer temperatures. The main objective of this work was to evaluate the effect of increased growth temperature on the germination ability of C. quitensis. Individuals were collected from King George Island and grown at two different thermoperiods: 5/2 and 11/5 A degrees C, dayight. Mature seeds produced under both growth temperatures were tested for viability and incubated under a range of temperatures from 5A degrees to 35 A degrees C. Seed viability was not significantly different between growth temperatures. Germination for C. quitensis was highly temperature dependent. Germination was modulated by temperatures over 10 A degrees C. Seeds from 5/2 A degrees C showed significant higher germination (> 80 %) between 10 and 15 A degrees C. Seed developed at 11/5 A degrees C showed a broader range of temperature for germination between 10 and 25 A degrees C. Higher growth temperature (11/5 A degrees C) reduced the germination time significantly. Our results suggest that annual production of seeds leads to a high probability of germination at warmer environmental conditions because dormancy would be reduced at higher temperatures. Therefore, higher environmental temperatures, as those predicted to occur because of global warming, would increase the propagation of C. quitensis by germination.
机译：据认为，南极地区存在的两种天然高等植物的种群增加是由于区域变暖导致其繁殖性能提高所致。瓜子种子和种子的散布仅限于夏季温度足够高的年份。这项工作的主要目的是评估生长温度升高对C. quitensis萌发能力的影响。从乔治国王岛收集个体，并在两种不同的热周期中生长：白天/晚上为5/2和11/5 A摄氏度。测试在两个生长温度下产生的成熟种子的生存力，并在从5A到35 A的温度范围内孵育。种子的生存力在两个生长温度之间没有显着差异。 quit。C. quitensis的萌发高度依赖于温度。发芽受到温度超过10 A摄氏度的调节。5/ 2 A摄氏度的种子在10到15 A摄氏度之间显示出更高的发芽率（> 80％）。11/5 A摄氏度下发育的种子表现出更宽的发芽率。发芽温度在10至25 A摄氏度之间。较高的生长温度（11/5 A摄氏度）显着减少了发芽时间。我们的结果表明，种子的年产量在较高的环境条件下会导致发芽的可能性很高，因为在较高的温度下休眠会减少。因此，较高的环境温度（如预计由于全球变暖而发生的温度）将通过萌发增加藜的繁殖。

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  • 来源
    《Polar biology》 |2017年第2期|449-455|共7页
  • 作者

    Sanhueza C.; Vallejos V.; Cavieres L. A.; Saez P.; Bravo L. A.; Corcuera L. J.;

  • 作者单位

    Univ Concepcion, Dept Bot, Fac Ciencias Nat & Oceanog, Barrio Univ S-N,Casilla 160-C, Concepcion, Chile;

    Univ Concepcion, Lab Cultivo Tejidos Vegetales, Ctr Biotecnol, Dept Silvicultura,Fac Ciencias Forestales, Casilla 160-C, Concepcion, Chile;

    Univ Concepcion, Dept Bot, Fac Ciencias Nat & Oceanog, Barrio Univ S-N,Casilla 160-C, Concepcion, Chile|IEB, Las Palmeras 3425, Santiago, Chile;

    Univ Concepcion, Lab Cultivo Tejidos Vegetales, Ctr Biotecnol, Dept Silvicultura,Fac Ciencias Forestales, Casilla 160-C, Concepcion, Chile;

    Univ La Frontera, Lab Fisiol & Biol Mol Vegetal, Inst Agroind, Dept Ciencias Agron & Recursos Nat,Fac Ciencias A, Casilla 54-D, Temuco, Chile|Univ La Frontera, Ctr Plant Soil Interact & Nat Resources Biotechno, Sci & Technol Bioresource Nucleus, Casilla 54-D, Temuco, Chile;

    Univ Concepcion, Dept Bot, Fac Ciencias Nat & Oceanog, Barrio Univ S-N,Casilla 160-C, Concepcion, Chile;

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  • 关键词

    Antarctic plants; Warming; Seeds; Germination; Maternal effect;

    机译：南极植物;温暖;种子;发芽;母体效应;

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