Assessment of transpiration efficiency in peanut (Arachis hypogaea l.) under drought using a lysimeter system

Ratnakumar, P and Vadez, V and Nigam, S N and Krishnamurthy, L (2009) Assessment of transpiration efficiency in peanut (Arachis hypogaea l.) under drought using a lysimeter system. Plant Biology, 11 (S1). pp. 124-130.

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Abstract

Transpiration efficiency (TE) is an important trait for drought tolerance in peanut (Arachis hypogaea L.). The variation in TE was assessed gravimetri- cally using a long time interval in nine peanut genotypes (Chico, ICGS 44, ICGV 00350, ICGV 86015, ICGV 86031, ICGV 91114, JL 24, TAG 24 and TMV 2) grown in lysimeters under well-watered or drought conditions. Transpiration was measured by regularly weighing the lysimeters, in which the soil surface was mulched with a 2-cm layer of polythene beads. TE in the nine genotypes used varied from 1.4 to 2.9 g kg)1 under well-watered and 1.7 to 2.9 g kg)1 under drought conditions, showing consistent variation in TE among genotypes. A higher TE was found in ICGV 86031 in both well-watered and drought conditions and lower TE was found in TAG-24 under both water regimes. Although total water extraction differed little across genotypes, the pattern of water extraction from the soil profile varied among genotypes. High water extraction within 24 days following stress imposition was negatively related to pod yield (r2 = 0.36), and negatively related to water extraction during a subsequent period of 32 days (r2 = 0.74). By contrast, the latter, i.e. water extraction during a period cor- responding to grain filling (24 to 56 days after flowering) was positively related to pod yield (r2 = 0.36). TE was positively correlated with pod weight (r2 = 0.30) under drought condition. Our data show that under an intermittent drought regime, TE and water extraction from the soil profile during a period corresponding to pod filling were the most important com- ponents.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Library ICRISAT
Date Deposited: 27 Aug 2011 06:36
Last Modified: 27 Aug 2011 06:36
URI: http://oar.icrisat.org/id/eprint/583
Official URL: http://dx.doi.org/10.1111/j.1438-8677.2009.00260.x
Projects: UNSPECIFIED
Funders: Generation Challenge Programme
Acknowledgement: The authors gratefully acknowledge the technical assis- tance provided in conducting the experiment by the Mr. Arjuna Rao and Mr. Anjaiah, technicians of crop physiol- ogy lab, ICRISAT, Patancheru, India. The work was supported by the Generation Challenge Program with a grant from the Bill and Melinda Gates Foundation (Trop- ical Legumes I project).
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