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Authors Akhter, J; Mahmood, K; Tasneem, MA; Naqvi, MH; Malik, KA
Author Full Name Akhter, J; Mahmood, K; Tasneem, MA; Naqvi, MH; Malik, KA
Title Comparative water-use efficiency of Sporobolus arabicus and Leptochloa fusca and its relation with carbon-isotope discrimination under semi-arid conditions
Source PLANT AND SOIL
Language English
Document Type Article
Author Keywords available soil water; C-13 discrimination; Leptochloa fusca; Sporobolus arabicus; water-use efficiency
Keywords Plus TRANSPIRATION EFFICIENCY; DIOXIDE; PLANTS; WHEAT; RATIO; C-13
Abstract Water-use efficiency (WUE) of Leptochloa fusca ( L.) Kunth (Kallar grass) and Sporobolus arabicus Boiss. was determined under different soil moisture regimes. Plants grown in lysimeters were subjected to three soil moisture regimes, viz. well-watered (100%), medium-watered (75%), and low-watered (50%) of total available water (TAW). The soil moisture was restored on alternate days by adding the required volume of water on the basis of neutron moisture meter readings taken from neutron access tubes installed in each lysimeter. The grasses were harvested after suitable intervals (similar to4 months) to obtain maximum biomass. Leaf samples collected at each harvest were analyzed for carbon-isotope discrimination (delta(13)C) with an isotope ratio (C-13/C-12) mass spectrometer. Results indicated significant differences in WUE of both grasses subjected to different water regimes. Sporobolus arabicus showed higher WUE than Kallar grass. However, Kallar grass showed better value of yield response factor (k(y)=0.649) compared with Sporobolus (k(y)=1.06) over the entire season. The data confirm that these grasses can be grown successfully in water-limited environments by selecting an optimum soil moisture level for maximum biomass production. The mean carbon-isotope discrimination (delta(13)C) of Kallar grass (-14.4parts per thousand) and Sporobolus (-12.8parts per thousand) confirm that both are C-4 plants. The carbon-isotope discrimination (Delta) was significantly and negatively correlated with WUE of the two species studied. The results of the present study confirm that delta(13)C or Delta of leaves can be used as good predictor of WUE in some C-4 plants.
Author Address NIAB, Faisalabad 38000, Pakistan; Pakistan Inst Nucl Sci & Technol, Islamabad 45650, Pakistan
Reprint Address Akhter, J (corresponding author), NIAB, POB 128,Jhang Rd, Faisalabad 38000, Pakistan.
E-mail Address niab@fsd.paknet.com.pk
Times Cited 14
Total Times Cited Count (WoS, BCI, and CSCD) 18
Publisher SPRINGER
Publisher City DORDRECHT
Publisher Address VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN 0032-079X
29-Character Source Abbreviation PLANT SOIL
ISO Source Abbreviation Plant Soil
Publication Date FEB
Year Published 2003
Volume 249
Issue 2
Beginning Page 263
Ending Page 269
Digital Object Identifier (DOI) 10.1023/A:1022836916394
Page Count 7
Web of Science Category Agronomy; Plant Sciences; Soil Science
Subject Category Agriculture; Plant Sciences
Document Delivery Number 658XE
Unique Article Identifier WOS:000181745700003
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