Dictionary definition: pollen grain

Article: Flowering-shoot defoliation affects pollen grain ...
Ecology;  September 1, 1998 ;     700+ words ... ... are associated with mean differences in pollen-grain size, suggesting that a pollen grain's own resources might relate to its performance ... removing leaf area on pollen production, pollen-grain size, and postpollination pollen performance ...

Article: Ca^sup 2+^ Dynamics in a Pollen Grain and Papilla ...
Plant Physiology;  November 1, 2004 ;     700+ words ... ... vivo studies of Ca^sup 2+^ in the pollen grain and papilla cell during pollination ... dynamics during pollination. In the pollen grain, [Ca^sup 2+^]^sub cyt^ increased ... succession, just under the site of pollen-grain attachment. [Ca^sup 2+^]^sub ...

Article: Pollen grain morphology of selected allergenic ...
Journal of the Torrey Botanical Society;  October 1, 2007 ;     700+ words ... ... 4to piso, C1113, Ciudad de Buenos Aires, Argentina). Pollen grain morphology of selected allergenic species native to southern ... relation has been calculated for each specimen (individual pollen grain). Permanent slides are housed at the Palynological Laboratory ...

Article: Pollen maps our impact on plants ; More on pollen, from ...
Western Morning News, The Plymouth (UK);  July 30, 2008 ;     512 words ... ... towards the ovaries, eventually reaching them and the female sex cells within. The male gamete is then released from the pollen grain, travelling down the tube to fuse with an egg cell, the process known as fertilisation. The result of this is a young ...

Article: Gene tests help solve 'abominable mystery' of flowering ...
The Independent - London;  November 27, 2007 ;     650 words ... ... sudden and dramatic appearance of flowering plants 130 million years ago. For tens of ... how today's 400,000 species of flowering plants are related to one another, and ... major groups in the family tree of flowering plants originated within the space of just ...

Article: Flowering plants evolved into five groups 5 million ...
The Hindustan Times;  November 28, 2007 ;     687 words ... ... early plant evolution by finding that flowering plants had evolved into five groups in a ... that a stunning diversification of flowering plants took place in the period of less than ... resulted in all five major lineages of flowering plants that exist today. "Flowering ...

Article: Flowering plants reinvented weediness by ...
Asian News International;  September 4, 2009 ;     627 words ... ... A new research has determined that flowering plants originated not as trees, but as relatively ... reinventing the concept of weediness. Flowering plants widespread and are phenomenally successful ... his career studying "non-tree" flowering plants to discover more about their origins ...