| 向日葵种子根的向光反应特性及其影响因素 |
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| 引用本文： | 范玉琴,吴辉,黄思梅.向日葵种子根的向光反应特性及其影响因素[J].嘉应学院学报,2007,25(3):77-80. |
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| 作者姓名： | 范玉琴 吴辉 黄思梅 |
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| 作者单位： | 嘉应学院,生物系,广东,梅州,514015 |
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| 摘 要： | 研究了向日葵种子根的向光反应特性及光照时间、光照强度IAA和GA3对其向光性的影响。结果表明:(1)向日葵种子根表现为负向光性倾斜生长;(2)在2~8h的光照时间内,向日葵种子根的负向光性与光照时间成正比;(3)在5~25 lx的光强范围内,向日葵种子根的负向光性与光强成正比;(4)0~10-4mol.L-1的IAA可促进根的伸长和增强其负向光性反应,随着IAA浓度的升高,向日葵种子根的负向光性反应消失,生长也受到抑制;(5)10-5~10-4 mol.L-1的GA3能促进向日葵种子根的伸长,但对其负向光性无明显影响。
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| 关 键 词： | 向日葵 种子根 负向光性 IAA GA3 |
| 文章编号： | 1006-642X（2007）03-0077-04 |
| 修稿时间： | 2007-01-12 |
Phototropic Responsive Property in Seminal Root of Sunflower (Helianthus annuus L.) and Its Influence Factors |
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| FAN Yu-qin,WU Hui,HUANG Si-mei.Phototropic Responsive Property in Seminal Root of Sunflower (Helianthus annuus L.) and Its Influence Factors[J].Journal of Jiaying University,2007,25(3):77-80. |
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| Authors: | FAN Yu-qin WU Hui HUANG Si-mei |
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| Institution: | Department of Biology, Jiaying University,Meizhou 514015, China |
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| Abstract: | The phototropic responsive property of seminal root of sunflower(Helianthus annuus L.) and the effects of illumination time,light intensity and phytohormone(including IAA and GA3) on its phototropism are studied in this paper.The main results are as follows:(1) The seminal roots of sunflower seedlings have the negative phototropism grown under unilateral light.(2) In the range of 2 to 8 hours,the negative phototropism in the seminal root of sunflower seedlings is in direct proportion to the illumination time.(3) Higher illumination of light ranges from 5 to 25 lx triggers the negative phototropism more than that under lower light illumination.(4) The seminal roots of sunflower seedlings could be elongated and has distinct negative phototropism with lower concentration IAA ranging from 0 to 10-4mol·L-1,whereas weakened or reduced in the negative phototropism and the elongation with the mcrease of the IAA concentration.(5) GA3 ranging from 10-5～10-4 mol·L-1 promotes the growth of the seminal roots,while no having obvious effect on their negative phototropism. |
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| Keywords: | Helianthus annuus L seminal root negative phototropism IAA GA3 |
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