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title: Pollen size strongly correlates with stigma depth among Pedicularis species
author: Wang, Xiang-Ping;  Yu, Wen-Bin;  Sun, Shi-Guo;  et al
Issued Date: 2016
Abstract: Darwin proposed that pollen size should be positively correlated with stigma depth rather than style length among species given that pollen tubes first enter the stigma autotrophically, then grow through the style heterotrophically. However, studies often show a positive relationship between pollen size and style length. Five floral traits were observed to be correlated among 42 bumblebee-pollinated Pedicularis species (Orobanchaceae) in which stigmas are distinct from styles. The phylogenetic independent contrast analysis revealed that pollen grain volume was more strongly correlated with stigma depth than with style length, consistent with Darwin's functional hypothesis between pollen size and stigma depth.
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Recommended Citation:
Wang, Xiang-Ping,Yu, Wen-Bin,Sun, Shi-Guo,et al. Pollen Size Strongly Correlates With Stigma Depth Among Pedicularis Species[J]. Journal Of Integrative Plant Biology,2016,58(10):818-821.

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