Response of peanut genotypes to mid-season moisture stress: phenological, morpho-physiological, and yield traits
Chuni Lal A C , K. Hariprasanna A , A. L. Rathnakumar A , J. B. Misra A , M. Y. Samdur B , H. K. Gor A , B. M. Chikani A and V. K. Jain AA Directorate of Groundnut Research, P. B. # 5, Junagadh – 362 001, Gujarat, India.
B Indian Agriculture Research Institute, Regional Research Station, Indore – 452 001, India.
C Corresponding author. Email: chunilal_nrcg@rediffmail.com
Crop and Pasture Science 60(4) 339-347 https://doi.org/10.1071/CP08183
Submitted: 29 May 2008 Accepted: 22 January 2009 Published: 21 April 2009
Abstract
Nine peanut genotypes were evaluated in two seasons under irrigated and simulated mid-season drought conditions to investigate the influence of water stress on some phenological, morpho-physiological, and yield traits. Analysis of variance revealed significant genotypic differences for all the traits studied. Water saturation deficit and epicuticular wax load increased in response to water stress and age of the crop, while specific leaf area decreased with water stress and age of the crop. In general, correlations of water saturation deficit (WSD), epicuticular wax load (EWL), and specific leaf area (SLA) with yield traits were fairly weak. WSD in the early stage under irrigated conditions was found to be positively associated with pod yield under water stress; EWL in the early stage was negatively associated with harvest index (HI) under stress. Although significant and negative correlations of SLA were found only when it was recorded in the early stage under stress and the later stage under irrigated conditions with HI and pod yield (PY), both under irrigated conditions, the trends of its associations showed that SLA had rather weak and negative correlations with PY and HI both under irrigated and stress conditions. Genotypes that accumulated flowers sooner after initiation showed less yield reduction. The negative association between HI under stress and its reduction deems HI under moisture stress an important criterion of selection for drought tolerance in peanut.
Additional keywords: drought tolerance, epicuticular wax load, harvest index, specific leaf area, water saturation deficit, pod yield.
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