Sexspecific Responses of Flowering Phenology and Floral Morphology of Humulus scandens to Drought

doi:10.7677/ynzwyj201414021

Abstract

Abstract:

In this paper, sexspecific differences in flowering phenology and floral morphology of Humulus scandens were tested using a pot experiment under watercontrolled condition. Obvious differences between the male and female individuals were observed in response to different water regime. Drought stress induced Hscandens population to flower earlier and last longer. Compared with males, flowers of female opened earlier. Moreover, inflorescence axis length, inflorescence axis diameter and anther length in droughtstressed males were significantly reduced 2481%, 2907%, and 514% (P<0001, P=0003, P=0024), respectively. Concomitantly, pollen quantity and the pollen vitality were also decreased significantly. In contrast, the inflorescence axis length, style length and average number of flowers per inflorescence in droughtstressed females were increased 978%, 7062%, and 5704% (P=0039, P<0001, P<0001), respectively. Furthermore, the seed length, and seed width, singleseed weight, and 1000seed weight under drought stress were significantly reduced 1212%, 1259%, 4343%, and 1538%, respectively (P<0001). On the other hand, compared with contrast, the aboveground biomass decreased significantly in both male and female Hscandens individuals under drought stress (P=0002, P=0020). However, the reproductive investment of females was significantly higher than males under drought stress (P=0049). In a word, effects of drought stress on flowering phenology and floral organs are significantly different between two sexes. To alleviate the negative influences on reproductive ability caused by drought, females of Hscandens individuals may allocate more biomass to reproductive organs than males under drought stress.

Key words: Drought, Flowering phenology, Floral morphology, Sexual differences

CLC Number:

Q 945，Q 948

YANG Shuai, WANG Bi-Xia, XU Xiao, HUAN Hui-Hui, QIN Fang, CHEN Meng-Hua. Sexspecific Responses of Flowering Phenology and Floral Morphology of Humulus scandens to Drought[J]. Plant Diversity, 2014, 36(05): 653-660.

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