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[1]樊艳欣,姜永雷,陈 珂 类延宝**.贡嘎山高低海拔上优势杨柳科植物性别比例与繁殖特性*[J].应用与环境生物学报,2018,24(04):1-8.[doi:10.3724/SP.J.1145.2017.09036]
 FAN Yanxin,JIANG Yonglei,et al.Sex Ratio Patterns and Reproductive Characteristics in Salicaceae Species along Gongga Mountain*[J].Chinese Journal of Applied & Environmental Biology,2018,24(04):1-8.[doi:10.3724/SP.J.1145.2017.09036]
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贡嘎山高低海拔上优势杨柳科植物性别比例与繁殖特性*()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
24卷
期数:
2018年04期
页码:
1-8
栏目:
研究论文
出版日期:
2018-08-25

文章信息/Info

Title:
Sex Ratio Patterns and Reproductive Characteristics in Salicaceae Species along Gongga Mountain*
文章编号:
201709036
作者:
樊艳欣1 2 姜永雷1 2 陈 珂3 类延宝1**
1中国科学院、水利部成都山地灾害与环境研究所 成都 610041
2中国科学院大学 北京 100049
3西南科技大学 绵阳 621010
Author(s):
FAN Yanxin1 2 JIANG Yonglei1 2 CHEN Ke3 & LEI Yanbao1**
1 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China?
2 University?of Chinese Academy of Sciences, Beijing 100049, China?
3 Southwest University of Science and Technology, Mianyang 621010, China
关键词:
杨柳科植物性别比例繁殖投入种群密度传粉效率
Keywords:
Salicaceae species sexual dimorphism reproductive investment population density pollination efficiency
DOI:
10.3724/SP.J.1145.2017.09036
摘要:
雌雄异株植物的性比问题一直是进化生物学的研究热点之一。本研究从繁殖投入、种群密度和传粉效率等方面对贡嘎山两个海拔高度(2000和2600 m)上冬瓜杨和川滇柳的性别比例与繁殖投入进行对比研究。结果显示:(1)低海拔下冬瓜杨和川滇柳雄雌性比(M / F )接近1:1平衡;而在高海拔区域出现性比失衡,即杨树偏雄(M/F=2.36, P=0.008),而柳树偏雌(M/F=0.62, P=0.033)。(2)冬瓜杨和川滇柳种群密度随海拔的升高均明显下降,但川滇柳密度显著高于冬瓜杨,柱头接收花粉数量亦显著高于冬瓜杨。(3)枝条水平上,杨柳的总繁殖结构生物量(花序干重+种子干重)在两个海拔上都为雌株高于雄株,相对繁殖投入在低海拔时雌株高于雄株;高海拔上冬瓜杨雌株高于雄株,而川滇柳由于叶片的补偿生长,包括更高的叶片生物量投入和光合能力,导致相对繁殖投入雌雄间无显著差异。叶生物量与繁殖结构生物量在低海拔存在明显的权衡关系,而在高海拔则被打破,容易导致性比失衡。冬瓜杨雌株繁殖投入显著高于雄株,雌株对高海拔更敏感,因而高海拔时偏雄性。川滇柳的繁殖投入在海拔间无差异,加之传粉效率较高,推测容易产生花粉管竞争,从而偏雌性。本研究对杨柳科植物性比失衡不同格局及其成因进行了初步探讨,未来需在分子水平上,结合性别决定基因、性染色体和表观遗传学等进一步深入研究。(图2 表2 参36)
Abstract:
The causes and consequences of sex-ratio variation in organisms with separate sexes remain a central theme in evolutionary biology. The sex ratios of sympatric Populus and Salix vary depending on altitude and species: 1:1 equlibrium sex ratios are observed at mid-altitude but skewed ones at high altitudes, where Populus shows male-biased and Salix female-biased sex ratios. In this study, reproductive investments, population density, and pollination efficiency of P. purdomii and S. magnifica were assessed at two different altitudes of 2000 and 2600 m at the Gongga Mountain with the aim to provide new clues to the interesting ecological and evolutionary puzzle. Our results showed that population densities significantly decreased from 2000 to 2600 m, with higher values in S. magnifica than in P. purdomii on both altitudes. The pollens received by stigma were also significantly higher in Salix, due to its high population density, as well as simultaneous wind and insect pollination, which may intensify gametophytic competition to favor selective fertilization by female-determining pollen tubes. Reproductive investments, including biomass in inflorescence and seed were higher in female Populus on both altitudes, whereas for Salix, higher in female at low altitude, and comparable at high altitude. Under optimal temperature and precipitation conditions on 2000 m, vigorous plant growth combined with relatively smaller reproductive investments will contribute to the 1:1 sex equilibrium. At high altitude, the balance between reproductive and vegetative growth, will be easily broken by more pronounced gender-related differences for reproduction, which will result in biased sex ratios, e.g. Populus exhibited male biased, Salix showed female biased at high altitude. Consequently, our results improve our understanding of the causes and consequences of sexual dimorphism in dioecious species. Yet, more information on the genetic or epigenetic bases of sex determining system, including definite sex chromosomes and sex markers is urgently needed.

备注/Memo

备注/Memo:
收稿日期:2017-09-26 接受日期:2017-12-23
*国家自然科学基金项目(31370607)资助
**通讯作者(E-mail:leiyb@imde.ac.cn)
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更新日期/Last Update: 2018-01-10