The effect of tetraploidization of wild Arachis on leaf morphology and other drought-related traits

Leal-Bertioli, S C M and Bertioli, D J and Guimaraes, P M and Pereira, T D and Galhardo, I and Silva, J P and Brasileiro, A C M and Oliveira, R S and Silva, P I T and Vadez, V and Araujo, A C G (2012) The effect of tetraploidization of wild Arachis on leaf morphology and other drought-related traits. Environmental and Experimental Botany, 84. pp. 17-24. ISSN 0098-8472

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Cultivated peanut is an allotetraploid (genome type AABB) with a very narrow genetic base, therefore wild species are an attractive source of new variability and traits. Because most wild species are diploid, the first step of introgression usually involves hybridization of wild species and polyploidization to produce a synthetic allotetraploid (AABB) that is sexually compatible with peanut. This study investigates drought-related traits such as leaf morphology, transpiration profile, chlorophyll meter readings (SCMR), specific leaf area (SLA) and transpiration rate per leaf area for two wild diploids (A. duranensis and A. ipaënsis) that could be of interest for improvement of the peanut crop. Furthermore, the inheritance of the traits from the diploid to the tetraploid state was investigated. Results showed that whilst some diploid traits such as SCMR, are maintained through hybridization and polyploidization, most characters, such as the leaf area, stomata size, trichome density and transpiration profile, are substantially modified. The study concludes that direct evaluations of drought-related traits in wild diploids may be useful for evaluation of wild species to be used in introgression. However, evaluations on wild-derived synthetic tetraploids are likely to be more informative.

Item Type: Article
Uncontrolled Keywords: Peanut; Transpiration; Synthetic allotetraploid; Introgression; Leaf morphology; Wild germplasm
Subjects: Mandate crops > Groundnut
Depositing User: Mr Siva Shankar
Date Deposited: 26 Apr 2012 09:41
Last Modified: 29 Dec 2016 08:44
Official URL:
Funders: Generation Challenge Programme, EMBRAPA Macroprograma 2
Acknowledgement: The authors would like to thank Generation Challenge Programme TL1, FAP-DF, CNPq and EMBRAPA Macroprograma 2 for funding this work; Dr. A.P. Fávero for providing the synthetic allotetraploid (A. ipaënsis × A. duranensis)4x, Dr. J.F.M. Valls for providing wild germplasm and for useful discussions, and L.F. Mesquita for greenhouse assistance.
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