Effect of water stress on yield and agronomic characters of peanut (Arachis hypogaea L.) (original) (raw)
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Crop and Pasture Science, 2009
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 s...
Biometric Parameters in Certain Peanut (Arachis hypogaea L.) Varieties Varying in Drought Tolerance
This study was based on the field performance of selected groundnut varieties namely VRI-2, VRI-3, VRI-4, VRI-5, VRI-6, TMV-13, ALR-1, ALR-3 and CO-2, collected from different parts of Tamil Nadu, South India. According to their yield performance during crop (without water deficit) season and drought (with water deficit) season under field conditions, these varieties were categorized into drought tolerant (DT) and drought susceptible (DS) types based on their drought response index (DRI) values. An array of biometric parameters was also analyzed in all the varieties during both seasons in order to understand how these parameters fluctuate due to water deficit. The results showed that variations in biometric parameters among the varieties were statistically significant. It is also clear that the DT types were different from the DS types in terms of biometric parameters. This research paper indicates that drought tolerance in peanut is a result of the interaction among many different biometric traits that work in a synergistic manner, conferring the ability to evade water deficit under field conditions.
2018
Two field experiments were conducted during Rabi 2014-15 and 2015-16 to screen 12 peanut genotypes for physiological traits and to study the changes in gas exchange parameters under water deficit condition. The two years data on various physiological and yield traits was collected, pooled and subjected to Repeated Measures mixed Analysis of Variance (RMANOVA) at a probability level of 5 % and Principal Component analysis was carried out using SPSS 20.0software. The physiological traits viz., gas exchange parameters, SCMR, SLA, RWC, RI and CSI of peanut leaves significantly differed among irrigation treatments and genotypes. From the PCs, it was clear that among all the twelve variables, photosynthetic rate, transpiration rate and pod yield are the major source of variation both in T1 and T2 treatments. Our results suggest that the genotypes TCGS 1345 followed by TCGS 1343 are promising genotypes which maintained least deviation on physiological traits and recorded high pod yields un...