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Blue Leaves

9/1/2013

2 Comments

 
PictureBlue leaves! Courtesy Beth King (STRI).
There are some advantages to having blue leaves. If you were even aware that plants could have blue leaves to begin with...

The story from a new paper by Simon Queenborough, Margaret Metz and colleagues demonstrates that a number of different plant species in tropical forests demonstrate what is known as delayed greening. This is a phenomenon whereby plants growing new leaves delay the addition of green pigmentation (i.e. the chlorophyll for photosynthesis) until the leaves are more mature. This can lead to slightly less green leaves, white leaves, red leaves....and even blue leaves! The idea behind this, most extensively explored by Lissy Coley and Tom Kursar at the University of Utah, is that delayed greening serves as a defense against insects trying to eat the leaves (known as herbivores). Chlorophyll has a lot of nitrogen, which is a valuable nutrient for animals. 

The question is whether or not delayed greening ultimately benefits the plant. A leaf without green pigmentation can't be used effectively to build new sugars through photosynthesis. But this new paper, in a special issue of the American Journal of Botany, demonstrates that seedlings with delayed greening have lower rates of mortality. At the same time, it demonstrates that saplings with delayed greening have lower rates of growth. In other words, there is a tradeoff: delayed greening appears to improve your chances of survival, but decrease the rate at which you can grow. 

A few outstanding questions based on my read of the paper: 

Is delayed greening hard-wired into a species throughout its ontogeny (all life history stages)? 
Is delayed greening solely a function of herbivory?
How does delayed greening vary with phylogeny (e.g. the species location on the tree of life)?

This new research demonstrates that from an evolutionary perspective, delayed greening is more than a novelty....it's a phenomenon that could lead us to a much better understanding of the trade-offs involved in growth and defense over the course of a plant's lifetime. I am looking forward to seeing what new doors fly open as a result...

Queenborough SA et al. Demographic consequences of chromatic leaf defence in tropical tree communities: do red young leaves increase growth and survival? Annals of Botany 112: 677-684. 



2 Comments
MartinEB
6/5/2015 08:14:38 am

What plants have been recorded with blue leaves?

Reply
Greg
6/7/2015 12:56:41 am

Hello Martin,

According to the paper, there are two species where the researchers found blue leaves: Moutabea aculeata (Polygonaceae) and Ampelocera edentula (Ulmaceae). There are likely other species all over the world. For instance, Australian Blue Gum Eucalyptus has young leaves that tend towards blue. I have not found a single database with all the species ever recorded, although that would be valuable!

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