Differential responses of accessions of native Australian Nicotiana species to water stress
Khondoker M. G. Dastogeer A B , Hua Li C , Krishnapillai Sivasithamparam C , Michael G. K. Jones C and Stephen J. Wylie C DA Department of Plant Pathology, Bangladesh Agricultural University, Mymensingh-2202.
B Present address: Plant Biotechnology Group, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA 6150, Australia.
C Plant Biotechnology Group, Western Australian State Agricultural Biotechnology Centre, School of Veterinary and Life Sciences, Murdoch University, Perth, WA 6150, Australia.
D Corresponding author. Email: s.wylie@murdoch.edu.au
Australian Journal of Botany 66(3) 265-277 https://doi.org/10.1071/BT17148
Submitted: 14 August 2017 Accepted: 11 May 2018 Published: 19 June 2018
Abstract
Thirty-two accessions of four Nicotiana species (Nicotiana benthamiana Domin, Nicotiana occidentalis H.-M.Wheeler, Nicotiana simulans N. Burb. and Nicotiana umbratica N.T.Burb.) collected from wild plants in northern Australia were assessed for responses to water stress. Under moderate water stress conditions, shoot fresh weight, shoot dry weight, root fresh weight, root dry weight, root : shoot ratio, and relative water content of leaves were significantly affected. However, the degree to which the accessions were affected varied considerably. Some accessions of N. simulans, N. benthamiana and N. occidentalis were significantly more affected by water stress than others. There was significant variation between accessions in leaf and shoot tip wilting times. Initial symptom expression (leaf wilting) was significantly delayed in three accessions of N. benthamiana, and in one accession of N. umbratica. The least water stress tolerant lines, two accessions each of N. benthamiana, N. occidentalis and N. simulans, exhibited advanced symptoms of water stress (shoot tip wilting) within 14–17 days of cessation of watering. This stage was significantly delayed in three accessions of N. benthamiana and two accessions N. occidentalis and one accession of each of N. simulans and N. umbratica, which showed tip wilting only after 21–24 days. There were variations among the accessions of same Nicotiana species on their tolerance to water stress. Plant responses to water stress could not be predicted from their plant biomass and leaf relative water content under well-watered conditions. Leaf chlorophyll content was variable under water stress, but did not correlate with water stress tolerance.
Additional keywords: biomass, chlorophyll content, drought, leaf wilting, RWC, shoot tip wilting.
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