Stability of the relationship between specific leaf area and carbon isotope discrimination across environments in peanut

Rao, R.C.N. and Wright, G.C. (1994) Stability of the relationship between specific leaf area and carbon isotope discrimination across environments in peanut. Crop Science, 34 (1). pp. 98-103.

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Abstract

In previous experiments,s pecific leaf area (SLA)w ass hownto be correlated with both carbonis otope discrimination( A) and water use efficiency in peanut( Arachis hypogaeaL .) suggesting that SLAc an be usedt o screen genotypesfo r W.H oweverv,e ry little information is available on the stability ofthe relationship between SLA and A across environmentsT. hep resent study was conducted to examine genotype × environment (G × E) interaction for the relationship betweenS LAa nd A. Four peanutg enotypes (Chico, McCubbinS,h ulamit, and Tifton-8) with contrasting carbon isotope discriminating characteristicsw ereg rownin the field either undera dequatelyir rigated or rainfed conditionsa t two locationsi n QueenslanAd,u stralia. Thes easonalc hangesi n A and SLAw ere examinedb y samplingl eaves at monthly intervals. The values of A and SLA were significantly influenced by the location, genotype, and irrigation treatments. Genotype × location interaction effects on the relationshipb etweenA and SLA were not significant. The positive relationship between SLA and A was maintained whend ata werec ombinedov er sites and treatments (r~ = 0.87, P < 0.01) indicating stability of the relationship across environments. The SLA was negatively correlated with nitrogen content per unit leaf area (SLN) which in turn was negatively correlated with A. The results suggested that SLA can be used as a surrogate for A.

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India
Subjects: Plant Physiology and Biochemistry > Plant Physiology
Divisions: Groundnut
Depositing User: Sandhya Gir
Date Deposited: 17 Nov 2010 17:23
Last Modified: 29 Dec 2010 20:28
Official URL: http://dx.doi.org/10.2135/cropsci1994.0011183X0034...
URI: http://eprints.icrisat.ac.in/id/eprint/659

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