Spring versus autumn leaf colours: Evidence for different selective agents and evolution in various species and floras
Spring versus autumn leaf colours: Evidence for different selective agents and evolution in various species and floras
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DOI：
10.1016/j.flora.2011.10.007
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发表时间：
2012-01-01
期刊：
影响因子：
1.9
通讯作者：
Sinkkonen, Aki
中科院分区：
文献类型：
--
作者：
Lev-Yadun, Simcha;Yamazaki, Kazuo;Sinkkonen, Aki
红色在阔叶木本植物的幼叶和老叶中很常见。假设树叶的颜色是适应性的，我们通过比较新叶和老叶的颜色，检验了不同的选择剂可能对春叶和秋叶的颜色起作用的可能性。我们在三个非常不同的木本植物区系(芬兰、日本和以色列)观察了春季和秋季的色彩，以便考虑到广泛的生态和进化光谱。零假设是，如果同样的选择性试剂在春季和秋季起作用，预计当春天的叶子是红色的时候，秋天应该总是红色的，而当春天的叶子是绿色的时候，秋天应该是绿色或黄色的。我们发现，春天的绿叶几乎只与秋天衰老时的黄叶颜色有关。具有红色秋叶的物种几乎总是在他们的春天的叶子中至少有一些红色。然而，约有一半的树种春季叶子为红色，秋季叶子为黄色。棕色的秋叶在我们研究的物种中并不常见。由于大约一半的春叶为红色的树种的秋叶为黄色，而不是相反的，我们得出结论，在许多情况下，春叶和秋叶的选择物质不同。(C)2011年爱思唯尔股份有限公司。版权所有。
Red colouration is common in young and old leaves of broadleaf woody species. Assuming that leaf colours are adaptive, we examined, by comparing the colouration in young versus old leaves, the possibility that different selection agents may have operated on spring versus autumn leaf colouration. We observed spring versus autumn colouration in three very different woody floras (Finland, Japan and Israel) in order to allow for a broad ecological and evolutionary spectrum. The null hypothesis was that if the same selective agents operated in spring and autumn, it is expected that when spring leaves are red, they should always be red in autumn, and when spring leaves are green, they should be green or yellow in autumn. We found that green spring leaves are almost exclusively associated with yellow leaf colour at senescence in autumn. Species with red autumn leaves almost always have at least some red colouration in their spring leaves. However, about half of the species with red spring leaves have yellow autumn leaves. Brown autumn leaves were not common in the species we studied. As about half of the species with red spring leaves have yellow autumn leaves but not vice versa, we conclude that there are many cases in which the selecting agents for spring versus autumn leaf colour were not the same. (C) 2011 Elsevier GmbH. All rights reserved.