Melatonin promotes seminal root elongation and root growth in transgenic rice after germination

2012 ◽  
Vol 53 (4) ◽  
pp. 385-389 ◽  
Author(s):  
Sangkyu Park ◽  
Kyoungwhan Back
Keyword(s):  
Root Growth ◽  
Transgenic Rice ◽  
Root Elongation ◽  
Seminal Root

Genetic variation in the root growth response of barley genotypes to salinity stress

2013 ◽  
Vol 40 (5) ◽  
pp. 516 ◽  
Author(s):  
Megan C. Shelden ◽  
Ute Roessner ◽  
Robert E. Sharp ◽  
Mark Tester ◽  
Antony Bacic
Keyword(s):  
Genetic Variation ◽  
Salt Stress ◽  
Root Growth ◽  
Salinity Stress ◽  
Early Phase ◽  
Root Elongation ◽  
Wild Barley ◽  
Seminal Root ◽  
Biochemical Characterisation ◽  
Barley Genotypes

We aimed to identify genetic variation in root growth in the cereal crop barley (Hordeum vulgare L.) in response to the early phase of salinity stress. Seminal root elongation was examined at various concentrations of salinity in seedlings of eight barley genotypes consisting of a landrace, wild barley and cultivars. Salinity inhibited seminal root elongation in all genotypes, with considerable variation observed between genotypes. Relative root elongation rates were 60–90% and 30–70% of the control rates at 100 and 150 mM NaCl, respectively. The screen identified the wild barley genotype CPI71284–48 as the most tolerant, maintaining root elongation and biomass in response to salinity. Root elongation was most significantly inhibited in the landrace Sahara. Root and shoot Na+ concentrations increased and K+ concentrations decreased in all genotypes in response to salinity. However, the root and shoot ion concentrations did not correlate with root elongation rates, suggesting that the Na+ and K+ concentrations were not directly influencing root growth, at least during the early phase of salt stress. The identification of genetic diversity in root growth responses to salt stress in barley provides important information for future genetic, physiological and biochemical characterisation of mechanisms of salinity tolerance.

Comparison of 4,4,4-Trifluoro-3-(indole-3-)butyric Acid Dissolved in Water and Dimethyl Sulfoxide as a Solvent on Root Growth of Rice

2012 ◽  
Vol 550-553 ◽  
pp. 1464-1467
Author(s):  
Xiu Ping Li ◽  
Yan Lai Zhang ◽  
Sasakawa Hideo
Keyword(s):  
Plant Growth ◽  
Root Growth ◽  
Dimethyl Sulfoxide ◽  
Butyric Acid ◽  
Untreated Control ◽  
Rice Plant ◽  
Root Elongation ◽  
Seminal Root ◽  
Root Weight ◽  
Dissolution Method

The effective dissolution method of 4,4,4-trifluoro-3-(indole-3-)butyric acid (TFIBA) to rice plant growth was examined. Elongation of rice seminal root was promoted approximately 80% by continuous supply of 10-5 mol L-1 TFIBA dissolved in water. The primitive effect of TFIBA dissolved in DMSO on root elongation was greater than that of TFIBA dissolved in water, and the length of root was significantly increased by 233% by treatment with TFIBA at 10-5 mol L-1, compared with that in untreated control seedlings. However, DMSO occurred increase of root weight and showed somewhat disadvantage about reproducibility of TFIBA effect. In contrast, the reproducibility of TFIBA effect was high in the solution prepared with water.

scholarly journals Genome-wide identification and transcriptional analyses of MATE transporter genes in root tips of wild Cicer spp. under aluminium stress

2020 ◽  
Author(s):  
Xia Zhang ◽  
Brayden Weir ◽  
Hongru Wei ◽  
Zhiwei Deng ◽  
Xiaoqi Zhang ◽  
...  
Keyword(s):  
Root Growth ◽  
Root Elongation ◽  
Transcriptional Profiling ◽  
Functional Characterization ◽  
Relative Reduction ◽  
Root Tips ◽  
Al Tolerance ◽  
Genome Wide ◽  
Encoding Genes ◽  
Al Treatment

AbstractChickpea is an economically important legume crop with high nutritional value in human diets. Aluminium-toxicity poses a significant challenge for the yield improvement of this increasingly popular crop in acidic soils. The wild progenitors of chickpea may provide a more diverse gene pool for Al-tolerance in chickpea breeding. However, the genetic basis of Al-tolerance in chickpea and its wild relatives remains largely unknown. Here, we assessed the Al-tolerance of six selected wild Cicer accessions by measuring the root elongation in solution culture under control (0 µM Al3+) and Al-treatment (30 µM Al3+) conditions. Al-treatment significantly reduced the root elongation in all target lines compared to the control condition after 2-day’s growth. However, the relative reduction of root elongation in different lines varied greatly: 3 lines still retained significant root growth under Al-treatment, whilst another 2 lines displayed no root growth at all. We performed genome-wide identification of multidrug and toxic compound extrusion (MATE) encoding genes in the Cicer genome. A total of 56 annotated MATE genes were identified, which divided into 4 major phylogeny groups (G1-4). Four homologues to lupin LaMATE (> 50% aa identity; named CaMATE1-4) were clustered with previously characterised MATEs related to Al-tolerance in various other plants. qRT-PCR showed that CaMATE2 transcription in root tips was significantly up-regulated upon Al-treatment in all target lines, whilst CaMATE1 was up-regulated in all lines except Bari2_074 and Deste_064, which coincided with the lines displaying no root growth under Al-treatment. Transcriptional profiling in five Cicer tissues revealed that CaMATE1 is specifically transcribed in the root tissue, further supporting its role in Al-detoxification in roots. This first identification of MATE-encoding genes associated with Al-tolerance in Cicer paves the ways for future functional characterization of MATE genes in Cicer spp., and to facilitate future design of gene-specific markers for Al-tolerant line selection in chickpea breeding programs.

scholarly journals Root Growth of Avocado is More Sensitive to Salinity than Shoot Growth

2004 ◽  
Vol 129 (2) ◽  
pp. 188-192 ◽  
Author(s):  
N. Bernstein ◽  
A. Meiri ◽  
M. Zilberstaine
Keyword(s):  
Salt Stress ◽  
Root Growth ◽  
Biomass Production ◽  
Root Elongation ◽  
Shoot Growth ◽  
Elongation Rate ◽  
Persea Americana ◽  
Root Growth Inhibition ◽  
Leaf Biomass ◽  
Volumetric Growth

In most crop species, growth of the shoot is more sensitive to salt stress than root growth. Avocado [Persea americana Mill.] is very sensitive to NaCl stress. Even low concentrations of salt (15 mm) inhibit tree growth and decrease productivity. Observations in experimental orchards have suggested that root growth in avocado might be more restricted by salinity than shoot growth. In the present study, we evaluated quantitatively the inhibitory effects of salt stress on growth of the avocado root in comparison to the shoot. Seedling plants of the West-Indian rootstock `Degania 117' were grown in complete nutrient solution containing 1, 5, 15, or 25 mm NaCl. The threshold NaCl concentration causing root and shoot growth reduction occurred between 5 and 15 mm. At all concentrations, root growth was much more sensitive to salinity than shoot growth. A concentration of 15 mm NaCl, which did not affect the rate of leaf emergence on the plant and decreased leaf biomass production only 10%, induced a 43% reduction in the rate of root elongation and decreased root volumetric growth rate by 33%. Under 25 mm NaCl, leaf biomass production, leaf initiation rate and leaf elongation rate were reduced 19.5%, 12%, and 5%, respectively, while root volumetric growth and root elongation rate were reduced 65% and 75%, respectively. This strong root growth inhibition is expected to influence the whole plant and therefore root growth under salinity should be considered as an important criterion for rootstocks' tolerance to NaCl.

Differential Root Growth of FourSetariaTaxa

Weed Science ◽  
1975 ◽  
Vol 23 (5) ◽  
pp. 364-368 ◽  
Author(s):  
P. L. Orwick ◽  
M. M. Schreiber
Keyword(s):  
Root Growth ◽  
Lateral Roots ◽  
Root Diameter ◽  
Seminal Root ◽  
Setaria Viridis ◽  
First Order ◽  
Setaria Faberi ◽  
Giant Foxtail ◽  
Green Foxtail ◽  
Controlled Environments

We studied the early root growth of fourSetariataxa: giant foxtail (Setaria faberiHerrm.), giant green foxtail [Setaria viridisvar.major(Gaud.) Posp.], robust white foxtail (Setaria viridisvar.robusta-albaSchreiber), robust purple foxtail (Setaria viridisvar.robusta-purpureaSchreiber). Growth studies in controlled environments showed significant differences in root elongation among the taxa at three photoperiods. Seminal root lengths after 4 days followed the order presented for selectivity and metabolism of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] and propazine [2-chloro-4,6-bis(isopropylamino)-s-triazine] (robust white foxtail > giant green foxtail = robust purple foxtail > giant foxtail). Giant foxtail had the greatest root diameter, resulting in the greatest surface area and volume when lengths were equated. The order of seminal root lengths or diameters changed little after 7 days. Robust white foxtail had the most and longest first order lateral roots. Diameter of first order laterals showed giant foxtail > giant green foxtail = robust purple foxtail > robust white foxtail.

Effects of Girdling and Defoliation on Root Activity and Survival of Eucalyptus regnans and E. viminalis Seedlings

1975 ◽  
Vol 2 (2) ◽  
pp. 197 ◽  
Author(s):  
BF Wilson ◽  
EP Bachelard
Keyword(s):  
Amino Acids ◽  
Root Growth ◽  
Root Elongation ◽  
Root Activity ◽  
Eucalyptus Regnans ◽  
Total Sugars ◽  
Fast Growing ◽  
Qualitative Changes

Fast-growing seedlings of E. regnans F.Muell. survive when bark-girdled, but die when defoliated or detopped or when the stem at a bark girdle is steam-killed. These differences are due to photosynthate passing bark birdles in large quantities, probably in internal primary phloem. Following defoliation or detopping, root elongation stops within 4 days, the root sap turns brown within 8-13 days, and the plant dies in 12-30 days. Total sugars and amino acids in the root sap changed only slightly following girdling or up to 8 days after detopping, but both increased tenfold 8-13 days after detopping. This increase is accompanied by qualitative changes in both sugars and amino acids, and by the appearance of inhibitor(s). Gibberellin and cytokinin activities in the sap are not affected by girdling or detopping. In contrast, fast-growing seedlings of E. viminalis Labill. survive detopping and, although root growth stops by 4 days, root sap stays colourless and without inhibitors.

scholarly journals A Model of the Extension and Branching of a Seminal Root of Barley, and Its Use in Studying Relations Between Root Dimensions I. the Model

1972 ◽  
Vol 25 (4) ◽  
pp. 669 ◽  
Author(s):  
C Hackett ◽  
DA Rose
Keyword(s):  
Hordeum Vulgare ◽  
Root Growth ◽  
Surface Area ◽  
Vegetative Growth ◽  
Seminal Root ◽  
Hordeum Vulgare L ◽  
Area And Volume

Previous papers have reported that relations between the total number, length, surface area, and volume of graminaceous root members tend to remain roughly constant during vegetative growth. Through the use of a model of the extension and branching of a seminal root of barley (Hordeum vulgare L.), which was developed for the purpose, an attempt has now been made to determine the properties of root growth responsible for the phenomenon.

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