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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #354800

Research Project: Development of High-Yielding, High-Oleic Peanut Cultivars or Germplasm with Tolerance to Biotic and Abiotic Stresses

Location: Crop Genetics and Breeding Research

Title: Expression of the limited-transpiration trait under high vapour pressure deficit in peanut populations: Runner and virginia types

Author
item Shekoofa, A - North Carolina State University
item Sinclair, T - North Carolina State University
item Aninbon, C - Khon Kaen University
item Holbrook, Carl - Corley
item Isleib, T - North Carolina State University
item Ozias-akins, P - University Of Georgia
item Chu, Y - University Of Georgia

Submitted to: Journal of Agronomy and Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/6/2017
Publication Date: 8/1/2017
Citation: Shekoofa, A., Sinclair, T.R., Aninbon, C., Holbrook Jr, C.C., Isleib, T.G., Ozias-Akins, P., Chu, Y. 2017. Expression of the limited-transpiration trait under high vapour pressure deficit in peanut populations: Runner and virginia types. Journal of Agronomy and Crop Science. 203(4):295-300.

Interpretive Summary: Drought can limit peanut yield, and the development of drought tolerance is an important breeding objective. A physiological trait to improve drought tolerance is limited transpiration (TR-lim), defined as a limitation on further increases in transpiration rate (TR) under high vapour pressure deficit (VPD) conditions. The advantage of the TR-lim trait is that it allows plant water conservation to increase soil water availability for use during late-season drought. While this trait has been identified in peanut, the level of heritability is unknown. The objective of this study was to obtain information on the expression of the TR-lim trait in two peanut populations. The results from each of the two populations showed that an effective expression of the TR-lim trait occurred in about 30% of the progeny in each population. While these results do not offer a definitive index on inheritance, they do indicate that there appears to be a strong possibility of transferring the TR-lim trait to offspring.

Technical Abstract: Drought can be a critical limitation on peanut yield. A physiological trait that may help to ameliorate drought is limited transpiration (TR-lim), defined as a limitation on further increases in transpiration rate (TR) under high vapour pressure deficit (VPD) conditions. The advantage of the TR-lim trait is that it allows plant water conservation to increase soil water availability for use during late-season drought. While this trait has been identified in peanut, there is no information of how readily the trait may be transferred to progeny lines. The objective of this study was to obtain preliminary information on the expression of the TR-lim trait in two peanut progeny populations. One population was runner type of 88 RILs derived from the mating of Tifrunner x NC 3033. The second set was selected for the virginia-type phenotype of large pods obtained from the mating of PI 585005 (ICGV 86015) and N0808olJCT, both of which expressed the TR-lim trait. A two-tier screen was applied to both populations. The initial screen was based on exposure of de-rooted shoots to silver ions. Fifteen runner type and 12 virginia type were selected for direct measures of transpiration response to varying VPD. The results from each of the two populations showed that an effective expression of the TR-lim trait occurred in about 30% of the progeny in each population. While these results do not offer a definitive index of inheritance, they do indicate that there appears to be a strong possibility of transferring the TR-lim trait to progeny genotypes.