Effect of Temperature and Water Deficit on Water-Use Efficiency, Carbon Isotope Discrimination, and Specific Leaf Area in Peanut
Abstract
Carbon isotope discrimination (Δ) and specific leaf area (SLA) have been shown to be correlated with water-use efficiency (WUE) of peanut (Arachis hypogaea L.) and SLA has been proposed as an indirect selection criterion for Δ and WUE. The effect of high temperature and water deficit on WUE, Δ, and SLA, and relations between them, was investigated in controlled environments. Five Spanish (A. hypogaea ssp. fastigiata) and three Virginia (A. hypogaea ssp. hypogaea, botanical type) lines were grown at mean temperatures of 27 and 34°C and at 50 and 100% available soil water (ASW) from first flowering to maturity, and WUE, Δ and SLA measured at maturity. Virginia genotypes had higher total dry matter, water use and WUE(P ≤ 0.01), but were more sensitive to high temperature (P ≤ 0.01) than Spanish genotypes. Water deficit reduced water use and SLA, and increased WUE. The only water deficit × temperature interaction (P
Citation
Crawfurd, P.Q.; Wheeler, T.R.; Ellis, R.H.; Summerfield, R.J.; Williams, J.H. Effect of Temperature and Water Deficit on Water-Use Efficiency, Carbon Isotope Discrimination, and Specific Leaf Area in Peanut. Crop Science (1999) 39 (1) 136-142. [DOI: 10.2135/cropsci1999.0011183X003900010022x]