Physiological drought resistance and accumulation of leaf phenolics in white clover interspecific hybrids
By S. Nichols, R. Hofmann, W. Williams. 2015
82 citations recorded by the source corpus.
Abstract This study investigated drought responses in first (BC 1 ) and second (BC 2 ) backcross generation hybrids of Trifolium repens L. × T. uniflorum L., and compared these to high-yielding T. repens L. (white clover) cultivars. Plant attributes included accumulation of leaf phenolics as well as other biochemical and physiological water stress responses. Measurements were made across broad clover types as well as on a subset of related material. Under drought, net photosynthesis decreased by 44–48% and transpiration rates decreased by 60% in the BC 2 family and in the white clover parent, but were unaltered in the BC 1 family. Drought-induced decreases in leaf water potential were more pronounced in the BC 1 family (−47%) than the BC 2 (−31%) and parental (−28%) material. Quercetin glycoside accumulation generally increased 2–3 fold under drought. Compared with the BC 2 family and with parent plants, the BC 1 family had 2.5–4x higher constitutive kaempferol glycoside levels, and 1.5–2.5x higher kaempferol glycoside accumulation under drought. Constitutive kaempferol glycoside accumulation was related to reduced senescence and to less pronounced decreases in shoot DW under drought stress. Hydroxycinnamic acid accumulation increased by 56–73% under water stress, particularly for the BC 1 generation. These results identify physiological and biochemical traits that help explain drought resistance of T. repens × T. uniflorum hybrids. The findings suggest merit for the selection of BC 1 families with increased accumulation of protective phenolic compounds in breeding programmes for improved drought resistance.
Subfields: Molecular Biology, Plant Science
View Paper: https://www.semanticscholar.org/paper/c3906645f824e506039193c66d3a0e491dc47e2b
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Citations in the corpus
- Response of Phenylpropanoid Pathway and the Role of Polyphenols in Plants under Abiotic Stress (2019, background): “Drought stress also regulated the biosynthetic pathways of phenolic acids and flavonoids, leading to enhanced accumulation of these compounds [82,110,111] which acted as antioxidants and prevented plants from adverse effects of water deficit conditions [112].”
- Mechanisms of plant response to salt and drought stress and their alteration by rhizobacteria (2016, background): “Thus, increasing phenolic concentrations has been reported in white clover and an interspecific hybrid of Trifolium exposed to drought (Ballizany et al. 2012; Nichols et al. 2015), and wild genotypes of barley exposed to either salt or drought or both stresses (Ahmed et al.”