New Zealand plant growth trials in rapid bio-filtration media

2018 ◽  
Vol 13 (1) ◽  
pp. 229-236
Author(s):  
John Cheah ◽  
Troy Brockbank ◽  
Robyn Simcock ◽  
Michael Hannah
Keyword(s):  
New Zealand ◽  
Hydraulic Conductivity ◽  
Plant Growth ◽  
Plant Species ◽  
Grass Species ◽  
Short Term ◽  
Plant Trials ◽  
Plant Trial ◽  
Filtration Medium

Abstract Media used in rapid bio-filtration devices have hydraulic conductivity rates exceeding 2,500 mm/hr. Stormwater360 New Zealand has partnered with Contech Engineered Solutions (USA) to produce a rapid bio-filtration medium using locally available materials. Current bio-filtration guidance limits the hydraulic conductivity of media to less than 300 mm/hr to support plant growth. Using a short-term plant trial (3 months) and 4 ongoing plant trials (>11 months) plant growth was assessed. In total 99 plants were grown (26 different tree, shrub and grass species), of which 91 plants (92%) and 23 plant species (88%) successfully established and grew in the rapid filtration medium.

Isolation and identification of plant growth-promoting bacteria associated with tall fescue

2009 ◽  
pp. 211-216 ◽  
Author(s):  
J. Monk ◽  
E. Gerard ◽  
S. Young ◽  
K. Widdup ◽  
M. O'Callaghan
Keyword(s):  
New Zealand ◽  
Plant Growth ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Plant Growth Promoting Bacteria ◽  
Beneficial Bacteria ◽  
Isolation And Identification ◽  
Naturally Occurring ◽  
Plant Growth Promoting ◽  
Growth Promoting

Tall fescue (Festuca arundinacea) is a useful alternative to ryegrass in New Zealand pasture but it is slow to establish. Naturally occurring beneficial bacteria in the rhizosphere can improve plant growth and health through a variety of direct and indirect mechanisms. Keywords: rhizosphere, endorhiza, auxin, siderophore, P-solubilisation

scholarly journals The Singular Molecular Conformation of Humic Acids in Solution Influences Their Ability to Enhance Root Hydraulic Conductivity and Plant Growth

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 3
Author(s):  
Maite Olaetxea ◽  
Veronica Mora ◽  
Roberto Baigorri ◽  
Angel M. Zamarreño ◽  
Jose M. García-Mina
Keyword(s):  
Polyethylene Glycol ◽  
Humic Acid ◽  
Hydraulic Conductivity ◽  
Plant Growth ◽  
Polyacrylic Acid ◽  
Molecular Conformation ◽  
Water Solution ◽  
Biological Effects ◽  
Root Hydraulic Conductivity ◽  
Molecular Systems

Some studies have reported that the capacity of humic substances to improve plant growth is dependent on their ability to increase root hydraulic conductivity. It was proposed that this effect is directly related to the structural conformation in solution of these substances. To study this hypothesis, the effects on root hydraulic conductivity and growth of cucumber plants of a sedimentary humic acid and two polymers—polyacrylic acid and polyethylene glycol—presenting a molecular conformation in water solution different from that of the humic acid have been studied. The results show that whereas the humic acid caused an increase in root hydraulic conductivity and plant growth, both the polyacrylic acid and the polyethylene glycol did not modify plant growth and caused a decrease in root hydraulic conductivity. These results can be explained by the different molecular conformation in water solution of the three molecular systems. The relationships between these biological effects and the molecular conformation of the three molecular systems in water solution are discussed.

scholarly journals Species delimitation and phylogeny of a New Zealand plant species radiation

2009 ◽  
Vol 9 (1) ◽  
pp. 111 ◽  
Author(s):  
Heidi M Meudt ◽  
Peter J Lockhart ◽  
David Bryant
Keyword(s):  
New Zealand ◽  
Plant Species ◽  
Species Delimitation ◽  
Species Radiation

Phytotoxic Effects of Treated Wastewater Used for Agricultural Irrigation On Root Hydraulic Conductivity and Plant Growth

2021 ◽  
Author(s):  
Sare Asli ◽  
Nedal Massalha ◽  
Muhamad Hugerat
Keyword(s):  
Cell Wall ◽  
Hydraulic Conductivity ◽  
Plant Growth ◽  
Root Elongation ◽  
Dry Weight ◽  
Cell Permeability ◽  
Treated Wastewater ◽  
Pressurized Water ◽  
Pore Sizes ◽  
Physical Effects

Abstract AimsTo determine the effects of treated wastewater (TWW) and dialyzed TWW (DTWW) through dialysis tube with a cut-off at 6000-8000 Da, on the water transport characteristics of maize seedlings (Zea mays L). MethodsLaboratory experiments were conducted to determine the effect of TWW on the hydraulic conductivity of excised roots. Moreover, the effect on transpiration, plant growth, root cell permeability and on the plant fresh and dry weight was determined. ResultsPressurized water flow through the excised primary roots was reduced by 25%-52%, within 90 min of exposure to TWW or DTWW. In hydroponics, DTWW affected root elongation severely by 58 %, while cell-wall pore sizes of same roots were little reduced (by 6%). Additionally, the exposure to TWW or DTWW caused inhibition of both leaf growth rate by (26%-70%) and transpiration by (14%-64%). While in soil growth, the plant fresh and dry weight was also significantly affected but not with secondary DTWW. Conclusions These impacts appeared simultaneously to involve phytotoxic and physical clogging impacts. First, the inhibition in hydraulic conductivity through live roots (phytotoxic and physical effects) after exposure to secondary DTWW was by 22%, while through killed roots accepted after hot alcohol disruption of cell membranes (physical effects only); was only by 14%. Second, although DTWW affected root elongation severely by 58%, cell-wall pore sizes of same roots were little reduced by 6%. We conclude that large molecules, such as polypeptides, remained after the dialysis process, may have produced hormone-like activity that affected root water permeability.

scholarly journals Cloning and Mapping of a Putative Barley NADPH-Dependent HC-Toxin Reductase

1997 ◽  
Vol 10 (2) ◽  
pp. 234-239 ◽  
Author(s):  
F. Han ◽  
A. Kleinhofs ◽  
A. Kilian ◽  
S. E. Ullrich
Keyword(s):  
Plant Species ◽  
Chromosome 9 ◽  
Immature Embryos ◽  
Chromosome 1 ◽  
Grass Species ◽  
Cochliobolus Carbonum ◽  
Wide Range ◽  
Young Leaves ◽  
High Conservation ◽  
Hc Toxin

The NADPH-dependent HC-toxin reductase (HCTR), encoded by Hm1 in maize, inactivates HC-toxin produced by the fungus Cochliobolus carbonum, and thus confers resistance to the pathogen. The fact that C. carbonum only infects maize (Zea mays) and is the only species known to produce HC-toxin raises the question: What are the biological functions of HCTR in other plant species? An HCTR-like enzyme may function to detoxify toxins produced by pathogens which infect other plant species (R. B. Meeley, G. S. Johal, S. E. Briggs, and J. D. Walton, Plant Cell, 4:71–77, 1992). Hm1 homolog in rice (Y. Hihara, M. Umeda, C. Hara, Q. Liu, S. Aotsuka, K. Toriyama, and H. Uchimiya, unpublished) and HCTR activity in barley, wheat, oats and sorghum have been reported (R. B. Meeley and J. D. Walton, Plant Physiol. 97:1080–1086, 1993). To investigate the sequence conservation of Hm1 and HCTR in barley and the possible relationship of barley Hm1 homolog to the known disease resistance genes, we cloned and mapped a barley (Hordeum vulgare) Hm1-like gene. A putative full-length cDNA clone, Bhm1-18, was isolated from a cDNA library consisting of mRNA from young leaves, inflorescences, and immature embryos. This 1,297-bp clone encodes 363 amino acids which show great similarity (81.6%) with the amino acid sequence of HM1 in maize. Two loci were mapped to barley molecular marker linkage maps with Bhm1-18 as the probe; locus A (Bhm1A) on the long arm of chromosome 1, and locus B (Bhm1B) on the short arm of chromosome 1 which is syntenic to maize chromosome 9 containing the Hm2 locus. The Bhm1-18 probe hybridized strongly to a Southern blot of a wide range of grass species, indicating high conservation of HCTR at the DNA sequence level among grasses. The HCTR mRNA was detected in barley roots, leaves, inflorescences, and immature embryos. The conservation of the HCTR sequence, together with its expression in other plant species (R. B. Meeley and J. D. Walton, Plant Physiol. 97:1080–1086, 1993), suggests HCTR plays an important functional role in other plant species.

Modelling the abundance of three key plant species in New Zealand hill-pasture using a decision tree approach

2009 ◽  
Vol 220 (15) ◽  
pp. 1819-1825 ◽  
Author(s):  
Liqiang Wan ◽  
Baisen Zhang ◽  
Peter Kemp ◽  
Xianglin Li
Keyword(s):  
New Zealand ◽  
Decision Tree ◽  
Plant Species ◽  
Tree Approach

scholarly journals Short-term root and leaf decomposition of two dominant plant species in a Siberian tundra

Pedobiologia ◽  
2017 ◽  
Vol 65 ◽  
pp. 68-76 ◽  
Author(s):  
Peng Wang ◽  
Jasper van Ruijven ◽  
Monique M.P.D. Heijmans ◽  
Frank Berendse ◽  
Ayal Maksimov ◽  
...  
Keyword(s):  
Plant Species ◽  
Leaf Decomposition ◽  
Short Term ◽  
Dominant Plant Species
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