Biodiversity Science ›› 2019, Vol. 27 ›› Issue (4): 373-379.doi: 10.17520/biods.2019003

• Original Papers • Previous Article     Next Article

Adaptive significance of yellow flowered Bombax ceiba (Malvaceae)

Xiang Wenqian, Ren Mingxun()   

  1. Center for Terrestrial Biodiversity of the South China Sea, College of Ecology and Environment, Hainan University, Haikou 570228
  • Received:2019-01-07 Accepted:2019-05-04 Online:2019-06-05
  • Ren Mingxun E-mail:renmx@hainanu.edu.cn

Bombax ceiba is a tall tree species with predominantly red flowers and is normally pollinated by birds. In some populations, a yellow flowered variety occurs. Honeybees frequently visit these uncommon yellow flowers but how this adaptation affects the life history of this variant remains unexplored. In the present study, floral syndrome and pollination mechanism of yellow flowers were compared with red flowers of B. ceiba populations on Hainan Island, southern China. The results showed that main nectar components of two floral phenotypes are both glucose and fructose dominated, and the volatile chemicals are mainly alkanes, esters, phenols and acids with no significant difference between the two phenotypes. The relative spectral reflectance showed that both birds and honeybees could detect the yellow flowers, suggesting visitation by honeybees can compensate for times when bird visitation is low. Compared with red flowers, yellow flower had a lower degree of dichogamy, which might increase selfing possibilities and provide reproduction assurance when red flowers receive low bird visitation. Interestingly, yellow flowers had a relatively higher degree of herkogamy, i.e. stigmas are much higher than anthers when compared to the red flowers. Greater herkogamy in yellow flowers may reflect an adaptation to decreased dichogamy, avoiding autonomous selfing and interference between female and male organs. Fruit set of the yellow phenotype (1.08 ± 0.56)% was lower than that of red phenotype (3.27 ± 0.93)%, suggesting pollen-limitation in B. ceiba. We propose that yellow flowers, with greater herkogamy but lower dichogamy, promote pollination via attracting diverse pollinators and protect red flowers from disturbance of honeybees.

Key words: bird-pollination, sexual interference, reproductive assurance, dichogamy, herkogamy

Fig. 1

Floral syndromes of red and yellow flowers of Bombax ceiba (I-L, I-S, P represent inner long stamen, inner short stamen and peripheral stamen, respectively)"

Fig. 2

Pollen viability and stigma receptivity of red and yellow flowers of Bombax ceiba"

Fig. 3

Relative spectral reflectance of red and yellow flowers of Bombax ceiba. The short dashed lines are spectral sensitivities of bees, the dotted line are spectral sensitivities of birds."

Table 1

Nectar volume, nectar components and volatile substances (%) of red and yellow flowers of Bombax ceiba. Data are mean ± standard. Different small letters mean significant difference at 0.05 level among treatments."

红花
Red flower
黄花
Yellow flower
花蜜产量 Nectar volume (mL) 7.46 ± 1.05a 7.78 ± 0.84a
果糖 Fructose (mg/mL) 13.30 ± 1.89a 13.09 ± 2.79a
葡萄糖 Glucose (mg/mL) 26.71 ± 0.86a 28.25 ± 2.04a
烷烃类 Hydrocarbon (%) 67.42 ± 13.92a 54.75 ± 7.78a
脂类 Lipids (%) 6.59 ± 0.54a 7.08 ± 0.98a
2,4-二叔丁基苯酚 2,4-Di-tert-butylphenol (%) 5.88 ± 1.53a 6.42 ± 0.93a
5-羟基-2,4-二叔丁基苯基酯戊酸5-hydroxy-pentanoic acid (% ) 0.79 ± 0.09a 0.55 ± 0.11a

Table 2

Pollinator visitation and fruit set (%) of red and yellow flowers of Bombax ceiba. Data are mean ± standard. Different small letters mean significant difference at 0.05 level among treatments."

红花植株
Red-flower
individual (n = 5)
黄花植株 Yellow-flower individual (n = 5)
花朵数量
No. of flowers per tree
10,050 ± 4,452.25a 9,780 ± 2,031.50a
每小时鸟类访花次数
Bird visits per hour
79 ± 14.27a 34.80 ± 19.61b
每小时蜜蜂访花次数
Honeybee visits per hour
100.40 ± 63.79a 360 ± 114.67b
果实数量
No. of fruits per tree
362 ± 102.32a 186.20 ± 66.52b
坐果率 Fruit set (%) 3.27 ± 0.93a 1.08 ± 0.56b
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