J Syst Evol ›› 2013, Vol. 51 ›› Issue (4): 405-412.doi: 10.1111/jse.12002

• Research Articles • Previous Articles     Next Articles

Increased seed set in down slope-facing flowers of Lilium duchartrei

Shi-Guo SUN* Chi-Yuan YAO   

  1. (College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, China)
  • Received:2012-11-16 Online:2012-12-17 Published:2013-03-19

Abstract: Flower orientation has been considered one aspect of floral attraction. Plants growing on slopes should orientate their flowers facing down slope towards greater open space to enhance reproduction by attracting more pollinators. Flower angle and floral symmetry may affect this pattern; for example, this trend would be overshadowed in vertical/pendent flowers with radial symmetry because the flowers can attract pollinators and provide landing platforms from many directions. We investigated this hypothesis in Lilium duchartrei, a herb with pendent and actinomorphic flowers, in the Hengduan Mountains region of China by measuring flower direction for individuals growing on flat ground and on slopes. We also changed flower direction from facing down to up slope to test the effects on pollinator visitation frequency and subsequent plant reproduction. Plants growing on flat ground orientate their flowers equally towards the four geomagnetic directions, whereas the flowers on individuals growing on slopes preferentially face down slope. This pattern was more pronounced for individuals growing on steeper slopes. There was a positive correlation between slope angle and the seed set of flowers facing down slope (control), but a negative correlation between seed set and flowers facing up slope. The visitation frequency also tended to be higher for control flowers on steeper slopes and lower for those flowers changed to face up slope. Unexpectedly, floral direction was not affected by flower angle or floral symmetry. The results suggest that a down slope orientation of flowers could function to improve pollination in heterogeneous pollination environments.

Key words: down-slope orientation, flower direction, Lilium duchartrei, reproductive success, slope angle.

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[1] Li-Xia CHENG Ping. Study on Tissue Culture and Macropropagation of Peeling-pineapple[J]. Chin Bull Bot, 2002, 19(02): 231 -233 .
[2] Meng Xiao-xiong. [J]. Chin Bull Bot, 1988, 5(02): 99 .
[3] Zhang Jun-wei and Mao Qing. A Preliminary Study on the Chemical Constituents of the Essential Oil of Zingibercorallinum[J]. Chin Bull Bot, 1988, 5(02): 108 -109 .
[4] Zhigang Huang;Huang Hu;Xuanzhi Zhao;Ruozhong Wang;Langtao Xiao *. Cloning and Bioinformatics Analysis of TIR1 cDNA from Super Hybrid Rice Parental Line 1S[J]. Chin Bull Bot, 2008, 25(06): 695 -700 .
[5] Mingkun Liu;Guanjun Liu;Xiufeng Yan. Co-expression of Polygonum sibiricum Glutathione Transferase and Cysteine Synthase Genes in Saccharomyces cerevisiae[J]. Chin Bull Bot, 2008, 25(06): 687 -694 .
[6] Dahong Li;Hui Liu;Yanli Yang;Pingping Zhen;Jiansheng Liang. Down-regulation of OsRACK1 by Anti-sense Approach Results in Drought Tolerance Enhancement in Rice (Oryza sativa)[J]. Chin Bull Bot, 2008, 25(06): 648 -655 .
[7] Xiuxia He;Yuanhua Yu*;Yong Zhang. Genetic Transformation of PSY Gene in Ginseng[J]. Chin Bull Bot, 2008, 25(05): 579 -584 .
[8] Qinghua Zhao*. Tissue Culture and Rapid Propagation of Cornus alba L.[J]. Chin Bull Bot, 2008, 25(02): 220 .
[9] Jiyan Qi Jianghua Yang Chaorong Tang. Sucrose Transporter Genes and Their Functions in Plants[J]. Chin Bull Bot, 2007, 24(04): 532 -543 .
[10] Lu Xue-hua and Chen Yang-chun. Tissue Culture and Plantlet Regeneration from Bulb of Lycoris aurea[J]. Chin Bull Bot, 1989, 6(03): 169 .