Nectary Structure of Selfing and Outcrossing Speciesin Roscoea

doi:10.7525/j.issn.1673-5102.2022.03.006

Abstract

Abstract:

Being the key floral structure of the reciprocal relationship between flowering plants and pollinators， the analysis of the differences of nectary structure among species with different reproductive characteristics could provide theoretical basis for understanding the evolution of reproductive characteristics of flowering plants. Two contrary species， Roscoea cautleoides with highly specialized outcrossing pollination system and R.schneideriana with autonomous selfing， were used to explore the biological importance of nectary. Nectary size and volume were recorded in the field and nectary location， external form and internal structure were observed by paraffin section staining method. The results showed that： both species had structural nectary. From the external morphology， R. cautleoides nectary was developed and secreted higher concentration sugar， while R. schneideriana nectary was wilting and had no nectar secretion. From the internal structure comparison， R. cautleoides nectary was specialized and the division of structure was clear， while R. schneideriana nectary structure appeared a degree of degradation. These results provid an important basis for revealing the differences of floral characteristics， pollination mechanism and breeding system， as well as the mechanism of nectar secretion between outcrossing and selfing species in Roscoea. It also lays a scientific foundation for further exploring the coevolutionary relationship between plants and pollinators， and understanding the origin and maintenance mechanism of nectary diversity.

Key words: Roscoea, nectary, breeding system, pollination mechanism, selfing, outcrossing

CLC Number:

Wenjing WANG, Hongfan CHEN, Guojun SHAO, Hong LIAO, Jianli ZHAO, Qingjun LI. Nectary Structure of Selfing and Outcrossing Speciesin Roscoea[J]. Bulletin of Botanical Research, 2022, 42(3): 364-372.

Figures/Tables 4

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