Variation in transpiration efficiency and its related traits in a groundnut (Arachis hypogaea L.) mapping population

Krishnamurthy, L and Vadez, V and Devi, M J and Serraj, R and Nigam, S N and Sheshshayee, M S and Chandra, S and Aruna, R (2007) Variation in transpiration efficiency and its related traits in a groundnut (Arachis hypogaea L.) mapping population. Field Crops Research, 103 (3). pp. 189-197.

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Abstract

Transpiration efficiency (TE) has been recognized as an important source of yield variation under drought stress in groundnut. Here the variation for TE is evaluated in a set of 318 recombinant inbred lines (RILs) of groundnut at F8 generation, derived from a cross between a high TE (ICGV 86031) and a low TE (TAG 24) parent, and the value of specific leaf area (SLA), SPAD chlorophyll meter readings (SCMR) and carbon isotope discrimination (Δ13C) as surrogates of TE are measured. Transpiration efficiency was measured gravimetrically in the 318 RILs and parents under progressive soil drying in a pot culture in two post-rainy seasons. Large and consistent variation for TE existed among the RILs across years. The overall distribution of TE among the RILs indicated that TE was governed by dominant and additive genes. Surrogates SLA and SCMR, were measured prior, during and after completion of the drought period, whereas Δ13C was measured on the dried tissue after harvest. Transpiration efficiency was negatively associated with SLA after the completion of stress treatment (r2=0.15) and Δ13C in leaves (r2=0.13) and positively associated with SCMR during stress (r2=0.17). These associations, all fairly weak, were significant only in 2004. None of these relationships was found in 2005. Although the heritability of SCMR during 2005 was relatively higher than that of TE, and although SCMR has previously been used to identify contrasting germplasm for TE, the stress-dependence of the relationship with TE, and the poor regression coefficients (r2) with that RIL population, do not confer that these surrogates are adequately robust enough in that population. Though more time consuming, a direct gravimetric evaluation for TE appeared to be more reliable.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Subjects:	Mandate crops > Groundnut
Depositing User:	Library ICRISAT
Date Deposited:	05 Sep 2011 00:59
Last Modified:	05 Sep 2011 00:59
URI:	http://oar.icrisat.org/id/eprint/856
Official URL:	http://dx.doi.org/10.1016/j.fcr.2007.06.009
Projects:	UNSPECIFIED
Funders:	Generation Challenge Programme
Acknowledgement:	The authors gratefully acknowledge the technical assistance provided in conducting the experiments and collection of data by the technicians of Crop Physiology Lab and Groundnut breeding, in particular Mr. M. Anjaiah and P. Arjun Rao, and the useful comments and suggestions given by Dr. F.R. Bidinger, Consultant Physiologist at the Crop Physiology Laboratory, to improve the manuscript. Authors are thankful to the Generation Challenge Program for their support to this study through funding of project #7.
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