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Photosynthetica

, Volume 51, Issue 3, pp 395–403 | Cite as

Sequence of physiological responses in groundnut (Arachis hypogaea L.) subjected to soil moisture deficit

  • P. R. Jeyaramraja
  • S. S. Thushara
Article

Abstract

Responses of drought-tolerant (DT) and drought-susceptible (DS) pot-grown groundnut (Arachis hypogaea L.) varieties to changes in leaf relative water content (RWC) were studied. Water stress (WS) was imposed on 30-day-old plants for 2 weeks. Leaf RWC decreased significantly under WS conditions with simultaneous decrease in net photosynthetic rate (P N) and stomatal conductance (g s). Even though no significant difference was observed between DT and DS varieties with regard to RWC, DT varieties were able to maintain significantly higher P N than DS varieties. Higher values of water use efficiency (WUE) were also observed in DT varieties during WS conditions. The decline in P N due to WS could be attributed to both reduction in g s (i.e. stomatal limitation) and to reduction in chlorophyll content (Chl). No significant difference in leaf area index (LAI) was found between DT and DS types and LAI was not reduced by WS. Significant differences were found among the studied groundnut varieties, but not between DT and DS types, in terms of root, aboveground, and total dry mass. These growth parameters significantly decreased under WS conditions. Based on the results, a sequence of physiological responses in groundnut crop subjected to WS was postulated.

Additional key words

drought susceptibility drought tolerance net photosynthesis peanut physiological mechanism water-use efficiency 

Abbreviations

ADM

aboveground dry mass

C

control, irrigated plants

Chl

chlorophyll

DS

drought-susceptible

DT

drought-tolerant

E

transpiration rate

gs

stomatal conductance to water vapour

LAI

leaf area index

PN

net photosynthetic rate

RDM

root dry mass

RLA

relative leaf area

RWC

leaf relative water content

SLM

specific leaf mass

TDM

total dry mass

WS

water stress

WUE

water-use efficiency

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Department of AgronomyHamelmalo Agricultural CollegeKeren, The State of EritreaNorth East Africa
  2. 2.Department of BiotechnologyKarpagam Arts & Science CollegeCoimbatoreIndia

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