@ARTICLE{TreeBASE2Ref18982,
author = {Donald H. Les and Sallie P. Sheldon and Nicholas P. Tippery},
title = {Hybridization in Hydrophiles: Natural Interspecific Hybrids in Najas L. (Hydrocharitaceae)},
year = {2010},
keywords = {matK/trnK, nrITS, phylogenetics, rbcL, water nymph, water pollination},
doi = {},
url = {http://},
pmid = {},
journal = {Systematic Botany},
volume = {},
number = {},
pages = {},
abstract = {Pollination by water (hydrophily) is a highly specialized mechanism that occurs rarely among aquatic angiosperms, which mainly retain the reproductive systems reminiscent of their terrestrial ancestors. Hydrophily is abiotic and typically associated with unisexual flowers, factors which predictably would promote xenogamy and outcrossing. Yet, there have been few reports of hybridization involving water-pollinated plants (hydrophiles), with no firm evidence of natural interspecific hybridization. The genus Najas comprises about 40 species of submersed aquatic plants, all characterized by subsurface hydrophily. Hybridization in this genus has been suspected, but verified previously only among infraspecific taxa. In this study we document the first instance of interspecific hybridization in Najas, using genetic evidence from three populations that were identifiable as N. guadalupensis but yielded polymorphic DNA sequence profiles. To facilitate our analysis we first conducted a phylogenetic survey of New World Najas taxa using nuclear and chloroplast markers. Alleles cloned from a biparentally-inherited locus (nrITS) in these aberrant populations associated with two distinct, but phylogenetically sister species (N. guadalupensis subsp. olivacea and N. flexilis) thus confirming their hybrid origin. In all cases, the chloroplast markers associated with N. guadalupensis subsp. olivacea, implicating it as the maternal parent. The hybrid Najas plants occur at the edge of the sympatric range of the parental species. They possess no readily distinctive morphological features and require genetic analysis for confident detection. One population grows aggressively, raising concerns that at least some hybrid Najas plants represent a potential conservation threat. The possible hybrid ancestry of the endemic N. guadalupensis subsp. muenscheri also was assessed, but could not be confirmed or refuted by the data evaluated.}
}
Taxa for Study 10549
Citation title:
"Hybridization in Hydrophiles: Natural Interspecific Hybrids in Najas L. (Hydrocharitaceae)".
Study name:
"Hybridization in Hydrophiles: Natural Interspecific Hybrids in Najas L. (Hydrocharitaceae)".
This study is part of submission 10539
(Status: Published).
Taxa
ID |
Taxon Label |
NCBI taxid |
uBIO namebankID |
424112 |
Hydrilla verticillata |
51024
|
2659727
|
424116 |
Najas arguta Brazil |
|
8645688
|
424111 |
Najas browniana Australia |
|
8646343
|
424113 |
Najas flexilis CT.DogPd |
29650
|
2659740
|
424121 |
Najas flexilis CT.ETwinLk |
29650
|
2659740
|
424095 |
Najas flexilis CT.GreatPd |
29650
|
2659740
|
424109 |
Najas flexilis VT.BurrPd |
29650
|
2659740
|
424115 |
Najas gracillima CT.BerlinPd |
374601
|
2659741
|
424125 |
Najas gracillima CT.BigelowHollow |
374601
|
2659741
|
424104 |
Najas gracillima CT.GayCitySP |
374601
|
2659741
|
424094 |
Najas gracillima CT.KnowltonPd |
374601
|
2659741
|
424120 |
Najas gracillima CT.PachaugPd |
374601
|
2659741
|
424110 |
Najas guadalupensis floridana FL.BonitaSpgs |
|
3879233
|
424130 |
Najas guadalupensis floridana FL.FIU |
|
3879233
|
424124 |
Najas guadalupensis guadalupensis CT.Wononscopomuc |
|
2674528
|
424127 |
Najas guadalupensis guadalupensis GA.LkSeminole |
|
2674528
|
424107 |
Najas guadalupensis guadalupensis LA.LSU |
|
2674528
|
424105 |
Najas guadalupensis guadalupensis OK.LkMurray |
|
2674528
|
424131 |
Najas guadalupensis muenscheri NY.HudsonR |
|
3879234
|
424128 |
Najas guadalupensis olivacea CT.BantamLk |
|
3879235
|
424100 |
Najas guadalupensis olivacea CT.TylerLk |
|
3879235
|
424108 |
Najas guadalupensis olivacea MI.Lk16 |
|
3879235
|
424118 |
Najas guadalupensis olivacea MN.NisswaLk |
|
3879235
|
424126 |
Najas hybrid CT.ETwinLk maternal |
|
|
424106 |
Najas hybrid CT.ETwinLk paternal |
|
|
424103 |
Najas hybrid CT.LeonardLk maternal |
|
|
424101 |
Najas hybrid CT.LeonardLk paternal |
|
|
424102 |
Najas hybrid CT.MaltbyLk maternal |
|
|
424114 |
Najas hybrid CT.MaltbyLk paternal |
|
|
424123 |
Najas marina FL.CapeCoral |
55316
|
2659744
|
424097 |
Najas marina MI.Lk16 |
55316
|
2659744
|
424098 |
Najas marina MN.BeckerLk |
55316
|
2659744
|
424096 |
Najas marina MN.FloridaLk |
55316
|
2659744
|
424099 |
Najas marina MN.PelicanLk |
55316
|
2659744
|
424117 |
Najas minor CT.LkWinnemaug |
62343
|
2659745
|
424132 |
Najas minor CT.MansfieldHollow |
62343
|
2659745
|
424129 |
Najas minor CT.PachaugPd |
62343
|
2659745
|
424122 |
Najas minor MI.HeritagePk |
62343
|
2659745
|
424119 |
Najas tenuifolia Australia |
|
10677764
|