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Transpiration efficiency of Amaranth (Amaranthus sp.) in response to drought stress

Jamalluddin, N, Massawe, FJ and Symonds, RC (2018) Transpiration efficiency of Amaranth (Amaranthus sp.) in response to drought stress. Journal of Horticultural Science and Biotechnology, 94 (4). pp. 448-459. ISSN 1462-0316

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Abstract

Drought is a major abiotic stress responsible for severe crop losses worldwide. Development of new crop varieties with increased drought tolerance is one way to increase crop productivity. The aim of this study was to characterise the diversity of nine accessions belonging to Amaranthus tricolor and A. cruentus, in response to drought stress using a dry-down protocol to characterise the transpiration efficiency (TE). Plants were subjected to either a gradual dry down or well-watered conditions. Results showed that TE was significantly higher (P < 0.01) in water-deficient (WD) plants compared to water-sufficient (WS) plants, 2.40 g kg−1–7.13 g kg−1 and 2.19 g kg−1–4.84 g kg−1, respectively. There was no significant difference in the fraction of transpirable soil water (FTSW) threshold decline between the amaranth genotypes. TE was highly correlated with yield under both WS (r = 0.89, P < 0.001) and WD conditions (r = 0.662, P < 0.001), and negatively correlated with root-to-shoot ratio under both WS (r = −0.488, P < 0.05) and WD conditions (r = −0.460, P < 0.05). Significant genotypic differences were seen for growth rate and stress susceptibility index (SSI). The result obtained in this investigation underline the need to identify genotypic variation in water use efficiency in amaranth.

Item Type: Article
Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Horticultural Science and Biotechnology on 30/10/2018, available online: http://www.tandfonline.com/10.1080/14620316.2018.1537725
Uncontrolled Keywords: 0706 Horticultural Production
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
S Agriculture > S Agriculture (General)
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Taylor & Francis
Related URLs:
Date Deposited: 17 Dec 2019 12:46
Last Modified: 17 Dec 2019 12:46
DOI or Identification number: 10.1080/14620316.2018.1537725
URI: http://researchonline.ljmu.ac.uk/id/eprint/9604

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