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International Journal of Agronomy
Volume 2011 (2011), Article ID 754658, 7 pages
http://dx.doi.org/10.1155/2011/754658
Research Article

Diversity in Drought Traits among Commercial Southeastern US Peanut Cultivars

Crop Science Department, North Carolina State University, Raleigh, NC 27695, USA

Received 13 August 2011; Accepted 12 September 2011

Academic Editor: David Clay

Copyright © 2011 Mura Jyostna Devi and Thomas R. Sinclair. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Commercial peanut cultivars in the USA are often grown under soil and environmental conditions resulting in intermittent periods of water deficit. Two plant traits have been identified that result in conservative use of water and allow sustained growth during drought: (1) restricted transpiration rate under high atmospheric vapor pressure deficit (VPD) and (2) earlier closure of stomata in the soil-drying cycle resulting in decreased daily transpiration rate. The objective of this study was to investigate whether there was diversity in these two putative traits for drought resistance among nine US commercial peanut cultivars. When the response to VPD was measured at an average temperature of 3 2 C, eight of the nine cultivars expressed a restricted transpiration rate at high VPD. However, at 2 4 C none of the cultivars exhibited a restriction of transpiration rate at high VPD. No differences were found among the nine cultivars in their response to soil drying.