Plant Diversity ›› 2014, Vol. 36 ›› Issue (05): 653-660.doi: 10.7677/ynzwyj201414021

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

YANG Shuai-1, WANG Bi-Xia-1、2, XU Xiao-1、2, HUAN Hui-Hui-1, QIN Fang-1, CHEN Meng-Hua-1   

  1. 1 College of Life Science, China West Normal University, Nanchong 637009, China; 2 Key Laboratory of Southwest China Wildlife Resources Conservation (China West Normal University), Ministry of Education, Nanchong 637009, China
  • Received:2014-02-16 Online:2014-09-25 Published:2014-06-19
  • Supported by:

    四川省教育厅项目 (12ZB142)

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