Genotypic variability among peanut (Arachis hypogea L.) in sensitivity of nitrogen fixation to soil drying

Jyostna Devi, M and Sinclair, T R and Vadez, V (2010) Genotypic variability among peanut (Arachis hypogea L.) in sensitivity of nitrogen fixation to soil drying. Plant and Soil, 330 (1-2). pp. 139-148. ISSN 0032-079X

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Peanuts (Arachis hypogea L.) are often grown on sandy soils and drought stress can be a major limitation on yield. In particular, loss in nitrogen fixation activity associated with soil drying might be limiting due to the need for high nitrogen amounts in both vegetative tissues and seeds of peanut. This study examined the response of nitrogen fixation of intact plants of seventeen peanut genotypes when subjected to soil drying in pots over approximately a 2-wk period. A large range in the sensitivity of nitrogen fixation to soil drying was observed among the seventeen genotypes. Genotype ICGV86015, in particular, was found to have nitrogen fixation that was especially tolerant of soil drying. Significant positive (P<0.0001) correlation was found between the soil water content at which nitrogen fixation began decreasing and the amino acid concentration in the leaves of severely stressed plants.

Item Type: Article
Agro Tags: <b>Agrotags</b> - planting | soil | nitrogen | genotypes | groundnuts | nitrogen fixation | concentrates | amino acids | acidity | drying <br><b>Fishtags</b> - drying <br><b>Geopoliticaltags</b> - virginia | florida
Subjects: Mandate crops > Groundnut
Depositing User: Users 6 not found.
Date Deposited: 28 Jul 2011 09:03
Last Modified: 03 Sep 2011 14:20
Official URL:
Funders: USAID, Generation Challenge Programme
Acknowledgement: The senior author was supported by a USAID-linkage grant between ICRISAT and the University of Florida. The lines used in the study were previously identified from a project funded by the Generation Challenge Program (#2005-31 “Unlocking the genetic diversity in peanut’s wild relatives with genomic and genetic tools”).
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