TY - JOUR
T1 - Pattern and timing of diversification in Yucca (Agavaceae)
T2 - Specialized pollination does not escalate rates of diversification
AU - Smith, Christopher Irwin
AU - Pellmyr, Olle
AU - Althoff, David M.
AU - Balcázar-Lara, Manuel
AU - Leebens-Mack, James
AU - Segraves, Kari A.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2008/2/7
Y1 - 2008/2/7
N2 - The yucca-yucca moth interaction is one of the most well-known and remarkable obligate pollination mutualisms, and is an important study system for understanding coevolution. Previous research suggests that specialist pollinators can promote rapid diversification in plants, and theoretical work has predicted that obligate pollination mutualism promotes cospeciation between plants and their pollinators, resulting in contemporaneous, parallel diversification. However, a lack of information about the age of Yucca has impeded efforts to test these hypotheses. We used analyses of 4322 AFLP markers and cpDNA sequence data representing six non-protein-coding regions (trnT-trnL, trnL, trnL intron, trnL-trnF, rps16 and clpP intron 2) from all 34 species to recover a consensus organismal phylogeny, and used penalized likelihood to estimate divergence times and speciation rates in Yucca. The results indicate that the pollination mutualism did not accelerate diversification, as Yucca diversity (34 species) is not significantly greater than that of its non-moth-pollinated sister group, Agave sensu latissimus (240 species). The new phylogenetic estimates also corroborate the suggestion that the plant-moth pollination mutualism has at least two origins within the Agavaceae. Finally, age estimates show significant discord between the age of Yucca (ca 6-10Myr) and the current best estimates for the age of their pollinators (32-40Myr).
AB - The yucca-yucca moth interaction is one of the most well-known and remarkable obligate pollination mutualisms, and is an important study system for understanding coevolution. Previous research suggests that specialist pollinators can promote rapid diversification in plants, and theoretical work has predicted that obligate pollination mutualism promotes cospeciation between plants and their pollinators, resulting in contemporaneous, parallel diversification. However, a lack of information about the age of Yucca has impeded efforts to test these hypotheses. We used analyses of 4322 AFLP markers and cpDNA sequence data representing six non-protein-coding regions (trnT-trnL, trnL, trnL intron, trnL-trnF, rps16 and clpP intron 2) from all 34 species to recover a consensus organismal phylogeny, and used penalized likelihood to estimate divergence times and speciation rates in Yucca. The results indicate that the pollination mutualism did not accelerate diversification, as Yucca diversity (34 species) is not significantly greater than that of its non-moth-pollinated sister group, Agave sensu latissimus (240 species). The new phylogenetic estimates also corroborate the suggestion that the plant-moth pollination mutualism has at least two origins within the Agavaceae. Finally, age estimates show significant discord between the age of Yucca (ca 6-10Myr) and the current best estimates for the age of their pollinators (32-40Myr).
KW - AFLP
KW - Adaptive radiation
KW - Agavaceae
KW - Agave
KW - Yucca
KW - cpDNA
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U2 - 10.1098/rspb.2007.1405
DO - 10.1098/rspb.2007.1405
M3 - Article
C2 - 18048283
AN - SCOPUS:37349070275
VL - 275
SP - 249
EP - 258
JO - Philosophical Transactions of the Royal Society B: Biological Sciences
JF - Philosophical Transactions of the Royal Society B: Biological Sciences
SN - 0962-8436
IS - 1632
ER -