Limits...
A Homoploid Hybrid Between Wild Vigna Species Found in a Limestone Karst.

Takahashi Y, Iseki K, Kitazawa K, Muto C, Somta P, Irie K, Naito K, Tomooka N - Front Plant Sci (2015)

Bottom Line: Genus Vigna comprise several domesticated species including cowpea and mungbean, and diverse wild species.We found an introgressive hybrid population derived from two wild species, Vigna umbellata and Vigna exilis, in Ratchaburi district, Thailand.We found the hybrid acquired vigorous growth from V. umbellata and drought tolerance plus early flowering from V. exilis, and thus has taken over some habitats of V. exilis in limestone karsts.

View Article: PubMed Central - PubMed

Affiliation: Genetic Resources Center, National Institute of Agrobiological Sciences Tsukuba, Japan.

ABSTRACT
Genus Vigna comprise several domesticated species including cowpea and mungbean, and diverse wild species. We found an introgressive hybrid population derived from two wild species, Vigna umbellata and Vigna exilis, in Ratchaburi district, Thailand. The hybrid was morphologically similar to V. umbellata but habituated in a limestone rock mountain, which is usually dominated by V. exilis. Analyzing simple sequence repeat loci indicated the hybrid has undergone at least one round of backcross by V. umbellata. We found the hybrid acquired vigorous growth from V. umbellata and drought tolerance plus early flowering from V. exilis, and thus has taken over some habitats of V. exilis in limestone karsts. Given the wide crossability of V. umbellata, the hybrid can be a valuable genetic resource to improve drought tolerance of some domesticated species.

No MeSH data available.


Photos of V. exilis (A) and V. umbellata (B) and a schematic map a limestone rock mountain near Wat Rat Singkhon (C).
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Figure 1: Photos of V. exilis (A) and V. umbellata (B) and a schematic map a limestone rock mountain near Wat Rat Singkhon (C).

Mentions: One of the particular interests is Vigna exilis Tateishi and Maxted, which grows on limestone rocks (Tomooka et al., 2002). There extends limestone karst landscape in north and west Thailand (Clemens et al., 2006), and V. exilis has been found only in the mogote-like hills or mountains in this region. It grows its root into cracks of the rocks in open or slightly shaded habitats (Tomooka et al., 2002; Figure 1A). Since limestone is mainly composed of calcium carbonate (CaCO3), this species is expected as a valuable genetic resource for alkaline tolerance (Tomooka et al., 2014). It used to be described as an accession of Vigna dalzelliana (O. Kuntze) Verdcourt but was recently admitted as an independent species (Tateishi and Maxted, 2002). The distinguishing characteristics are its flat, thin and linear seed shape and flat style beak (Tomooka et al., 2002).


A Homoploid Hybrid Between Wild Vigna Species Found in a Limestone Karst.

Takahashi Y, Iseki K, Kitazawa K, Muto C, Somta P, Irie K, Naito K, Tomooka N - Front Plant Sci (2015)

Photos of V. exilis (A) and V. umbellata (B) and a schematic map a limestone rock mountain near Wat Rat Singkhon (C).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664699&req=5

Figure 1: Photos of V. exilis (A) and V. umbellata (B) and a schematic map a limestone rock mountain near Wat Rat Singkhon (C).
Mentions: One of the particular interests is Vigna exilis Tateishi and Maxted, which grows on limestone rocks (Tomooka et al., 2002). There extends limestone karst landscape in north and west Thailand (Clemens et al., 2006), and V. exilis has been found only in the mogote-like hills or mountains in this region. It grows its root into cracks of the rocks in open or slightly shaded habitats (Tomooka et al., 2002; Figure 1A). Since limestone is mainly composed of calcium carbonate (CaCO3), this species is expected as a valuable genetic resource for alkaline tolerance (Tomooka et al., 2014). It used to be described as an accession of Vigna dalzelliana (O. Kuntze) Verdcourt but was recently admitted as an independent species (Tateishi and Maxted, 2002). The distinguishing characteristics are its flat, thin and linear seed shape and flat style beak (Tomooka et al., 2002).

Bottom Line: Genus Vigna comprise several domesticated species including cowpea and mungbean, and diverse wild species.We found an introgressive hybrid population derived from two wild species, Vigna umbellata and Vigna exilis, in Ratchaburi district, Thailand.We found the hybrid acquired vigorous growth from V. umbellata and drought tolerance plus early flowering from V. exilis, and thus has taken over some habitats of V. exilis in limestone karsts.

View Article: PubMed Central - PubMed

Affiliation: Genetic Resources Center, National Institute of Agrobiological Sciences Tsukuba, Japan.

ABSTRACT
Genus Vigna comprise several domesticated species including cowpea and mungbean, and diverse wild species. We found an introgressive hybrid population derived from two wild species, Vigna umbellata and Vigna exilis, in Ratchaburi district, Thailand. The hybrid was morphologically similar to V. umbellata but habituated in a limestone rock mountain, which is usually dominated by V. exilis. Analyzing simple sequence repeat loci indicated the hybrid has undergone at least one round of backcross by V. umbellata. We found the hybrid acquired vigorous growth from V. umbellata and drought tolerance plus early flowering from V. exilis, and thus has taken over some habitats of V. exilis in limestone karsts. Given the wide crossability of V. umbellata, the hybrid can be a valuable genetic resource to improve drought tolerance of some domesticated species.

No MeSH data available.