Polysaccharides and lipids in the developing anthers of Hong Kong orchid tree (Bauhinia blakeana)

Author

• Renhua Zheng 
• Shunde Su 
• Hui Xiao 
• Huiqiao TianEmail author

1. 1.
2. 2.

Original Article

First Online: 

20 April 2017

DOI: 10.1007/s00468-017-1548-0

Cite this article as:

Zheng, R., Su, S., Xiao, H. et al. Trees (2017). doi:10.1007/s00468-017-1548-0

Abstract

Key message

Microspore ofBauhinia blakeanabegins to accumulate lipids, and starches appear following bicellular pollen development. The development of tapetal cells ofB. blakeanais unusual in different stage.

Abstract

The distribution of starches and lipids in the developing anthers of Bauhinia blakeana was investigated using cytochemical methods. In young anthers, sporogenous cells accumulate some small lipids which remain in microspore mother cells but disappear during tetrad microspore development. Later in development, the microspore again begins to accumulate lipids, and some starches also appear following bicellular pollen development. At anthesis the nearly mature pollen grains accumulate abundant lipids and starches as fuel for subsequent pollen tube growth. Tapetal cells of B. blakeana are highly vacuolated at sporogenous stage and highly polar at tetrad stage. During the microspore stage, the large vacuoles of the tapetal cells decompose, the cell size decreases, and cell polarity disappears, leading to the formation of a layer of small cells containing density cytoplasm in which many lipids are synthesized, suggesting that in these cells, sugars are transformed into lipids to provide nutrition for the pollen. The structure and morphology of B. blakeana tapetal cells vary at different developmental stages, presenting a spatial–temporal pattern that appears to be coordinated with the process of pollen development.

Keywords

Anther development Lipid Polysaccharide Bauhinia blakeana 

Communicated by J. Lin.

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