Different responses of two contrasting Populus davidiana populations to exogenous abscisic acid application

Li, Chunyang; Yin, Chunying; Liu, Shirong

doi:10.1016/j.envexpbot.2003.11.001

Cited by 70 publications

(46 citation statements)

References 48 publications

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“…ABA has been reported to induce tolerance to different abiotic stresses including drought, heat, and chilling (Li et al 2004;Zhou et al 2005;Gong et al 2005). However, a few studies have shown that ABA caused a more detrimental effect on plant under heavy metal stresses.…”

Section: Discussionmentioning

confidence: 99%

“…Meanwhile, since ABA causes oxidative stress in plants, a high concentration of ABA (1,000 μm) induces an excessive generation of active oxygen species (AOS) and leads to an oxidative damage in plant cells (Jiang and Zhang 2001;Li et al 2010). Besides this, ABA is also recognized to have an important role in plants subjected to various environmental stresses such as cold, salt, and drought (Gong et al 1998;Jiang and Zhang 2002;Li et al 2004;Zhou et al 2006). Pretreatment with abscisic acid has been reported to significantly increase antioxidant enzymes activities and antioxidants in maize seedlings exposed to water stress (Jiang and Zhang 2002).…”

Section: Introductionmentioning

confidence: 99%

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Effect of exogenous abscisic acid on the level of antioxidants in Atractylodes macrocephala Koidz under lead stress

Wang

Chen

Pan

2012

Environ Sci Pollut Res

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This study hypothesized that the positive or negative effects of exogenous abscisic acid (ABA) on oxidative stress caused by lead were dose dependent. The effects of different levels of ABA (2.5, 5, and 10 mg L −1 ) on lead toxicity in the leaves of Atractylodes macrocephala were studied by investigating plant growth, soluble sugars, proteins, lipid peroxidation, and antioxidative enzymes. Excess Pb inhibited root dry weight, root length, and the number of lateral roots, but increased shoot growth. In addition, lead stress significantly decreased the levels of chlorophyll pigments, protein, and activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and peroxidase (POD). Different levels of ABA significantly increased SOD, CAT, POD, and APX activities, but decreased the level of hydrogen peroxide and malondialdehyde in nonstressed plants. Exogenous application of 2.5 mg L −1 ABA detoxified the stress-generated damages caused by Pb and also enhanced plant growth, soluble sugars, proteins, and all four antioxidant enzyme activities but reduced Pb uptake of lead-stressed plant compared to lead treatment alone. However, the toxic effects of Pb were further increased by the applications of 5 and 10 mg L −1 ABA. The levels of antioxidants caused by a low concentration of exogenous ABA might be responsible for minimizing the Pb-induced toxicity in A. macrocephala.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of exogenous abscisic acid on the level of antioxidants in Atractylodes macrocephala Koidz under lead stress

Wang

Chen

Pan

2012

Environ Sci Pollut Res

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“…As there are increasing areas of saline and alkaline soil in the world, it is necessary to do more research on salt-alkali stress and its effects on plants. In Populus, morphological, physiological and ecological differences between populations in responses to abiotic stresses, e.g., drought and UV-B, have been found (Li et al 2004, Lei et al 2006, Duan et al 2008. However, little attention has been focused on what kind of differences there are between populations in response to salt-alkali mixed stress.…”

mentioning

confidence: 99%

Effect of increased alkalinity on Na<sup>+</sup> and K<sup>+</sup> contents, lipid peroxidation and antioxidative enzymes in two populations of Populus cathayana

Zhang

Xu³

et al. 2009

Biologia plant.

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We compared two populations of Populus cathayana Rehder, originating from altitudes 2 840 m and 1 450 m, to determine whether trees from different altitudes exhibit different tolerance to alkalinity. The tree cuttings were exposed to nutrient solutions with pH 7.9, 8.8, 9.8 and 10.4 and the salt concentration 200 mM. Na + and K + contents, and Na + /K + ratios in leaves and roots were greatly affected by pH values. At pH 10.4, the Na + /K + ratios in both leaves and roots sharply dropped in the higher altitude population but were maintained at higher levels in the lower altitude population. The patterns of pH-induced changes in contents of malondialdehyde and free proline, and antioxidative enzyme activities indicated that the higher altitude population exhibits greater tolerance to alkalinity stress than does the lower altitude population.Additional key words: free proline, malondialdehyde, poplar, salt-alkali mixed stress.

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“…They also control seed dormancy together with ABA (reviewed in Graeber et al 2012). ABA regulates responses to abiotic stresses, especially drought (Li et al 2004;Popko et al 2010;Ji et al 2013).…”

Section: Approaching Tree Architecturementioning

confidence: 99%

Tracing a key player in the regulation of plant architecture: the columnar growth habit of apple trees (Malus × domestica)

Petersen

Krost

2013

Planta

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Plant architecture is regulated by a complex interplay of some key players (often transcription factors), phytohormones and other signaling molecules such as microRNAs. The columnar growth habit of apple trees is a unique form of plant architecture characterized by thick and upright stems showing a compaction of internodes and carrying short fruit spurs instead of lateral branches. The molecular basis for columnar growth is a single dominant allele of the gene Columnar, whose identity, function and gene product are unknown. As a result of marker analyses, this gene has recently been fine-mapped to chromosome 10 at 18.51-19.09 Mb [according to the annotation of the apple genome by Velasco (2010)], a region containing a cluster of quantitative trait loci associated with plant architecture, but no homologs to the well-known key regulators of plant architecture. Columnar apple trees have a higher auxin/ cytokinin ratio and lower levels of gibberellins and abscisic acid than normal apple trees. Transcriptome analyses corroborate these results and additionally show differences in cell membrane and cell wall function. It can be expected that within the next year or two, an integration of these different research methodologies will reveal the identity of the Columnar gene. Besides enabling breeders to efficiently create new apple (and maybe related pear, peach, cherry, etc.) cultivars which combine desirable characteristics of commercial cultivars with the advantageous columnar growth habit using gene technology, this will also provide new insights into an elevated level of plant growth regulation.

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Different responses of two contrasting Populus davidiana populations to exogenous abscisic acid application

Cited by 70 publications

References 48 publications

Effect of exogenous abscisic acid on the level of antioxidants in Atractylodes macrocephala Koidz under lead stress

Effect of exogenous abscisic acid on the level of antioxidants in Atractylodes macrocephala Koidz under lead stress

Effect of increased alkalinity on Na<sup>+</sup> and K<sup>+</sup> contents, lipid peroxidation and antioxidative enzymes in two populations of Populus cathayana

Tracing a key player in the regulation of plant architecture: the columnar growth habit of apple trees (Malus × domestica)

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