scholarly journals Effect of Humic Acid on Growth of `Muskogee' Crape Myrtle after Container Shielding Treatments

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 659a-659
Author(s):  
John G. Schluckebrier ◽  
Chris A. Martin
Keyword(s):  
Humic Acid ◽  
Shoot Growth ◽  
Growth Parameters ◽  
Acid Extract ◽  
Extract Concentration ◽  
Root And Shoot Growth ◽  
Polyethylene Container ◽  
Temperature Controlled ◽  
Concentration Levels ◽  
Leaf N

Rooted cuttings of crepe myrtle (Lagerstroemia indica L. × L. fauriei `Muskogee') were transplanted into 3.8-L black polyethylene containers filled with a bark-based rooting substrate and exposed for 2 months during Summer 1995 to either of three container shielding treatments: containers shielded from insolation (container shielded inside a whitewashed 11.4-L black polyethylene container), containers exposed to insolation, or containers shielded for 1 month then exposed for 1 month. Mean highest temperature in the western quadrant of rooting substrate of exposed containers was 16°C higher than for those in shielded containers. Containers exposed for 2 months had reduced root and shoot growth and increased leaf N compared with the other two treatments. Crape myrtle plants were next transplanted into 27.0-L polybags, transferred into a temperature-controlled glasshouse, and fertigated to container capacity every 3 days with humic acid extract at concentrations of 0, 50, 150, or 300 μl·L–1 for 2 additional months. Effects of the container shielding treatments for all growth parameters remained evident until the end of the experiment. Shoot and root extension growth of plants previously in containers shielded for 2 months and containers exposed for 2 months, responded in a quadratic fashion to humic acid extract concentration levels.

scholarly journals Effects of Above-Ground Pot-in-Pot (PIP) Placement and Humic Acid Extract on Growth of Crape Myrtle

1997 ◽  
Vol 15 (1) ◽  
pp. 41-44
Author(s):  
J.G. Schluckebier ◽  
C.A. Martin
Keyword(s):  
Humic Acid ◽  
Leaf Nitrogen ◽  
Shoot Length ◽  
Daily Maximum ◽  
Acid Extract ◽  
Direct Sunlight ◽  
Extract Concentration ◽  
Root And Shoot Length ◽  
Maximum Temperatures ◽  
Concentration Levels

Abstract Rooted cuttings of crape myrtle (Lagerstroemia indica L. × L. fauriei Koehne ‘Muskogee’) were potted into 3.8 liter (1 gal) black polyethylene containers and subjected for two months to one of three above-ground shielding treatments; containers placed pot-in-pot (PIP) for two months, containers exposed to direct sunlight for two months, or containers placed PIP for one month and then exposed to sunlight for one month (PIP/exposed). Mean daily maximum temperatures in rooting substrate of containers exposed to sunlight were as much as 16C (29F) higher than PIP containers. Plants in containers exposed to sunlight for two months had less total root and shoot length and higher concentrations of leaf nitrogen compared with the other two treatments. Plants were next transplanted into 27-liter (7-gal) polybags filled with a landscape substrate and fertigated with a humic acid extract at 0, 50, 150, or 300 μL/L for two additional months. The change in shoot and root length of plants previously placed PIP for two months responded in quadratic fashion to increased humic acid extract concentration levels; the most response occurred at about 50 μL/L while the highest concentrations inhibited post-transplant growth. Growth inhibition caused by heat stress as a result of exposure of container walls to insolation was still evident two months after transplanting.

scholarly journals Variability in Physiological Traits Reveals Boron Toxicity Tolerance in Aegilops Species

2021 ◽  
Vol 12 ◽  
Author(s):  
Mohd. Kamran Khan ◽  
Anamika Pandey ◽  
Mehmet Hamurcu ◽  
Zuhal Zeynep Avsaroglu ◽  
Merve Ozbek ◽  
...  
Keyword(s):  
Stress Tolerance ◽  
Shoot Growth ◽  
Growth Parameters ◽  
Normal Growth ◽  
Adaptive Plasticity ◽  
Boron Toxicity ◽  
Aegilops Species ◽  
Wild Wheat ◽  
Root And Shoot Growth ◽  
High Level

Boron (B) is an important micronutrient required for the normal growth and development of plants. However, its excess in the soil causes severe damage to plant tissues, which affects the final yield. Wheat, one of the main staple crops, has been reported to be largely affected by B toxicity stress in arid and semi-arid regions of the world. The prevalence of B toxicity stress can be addressed by utilizing wild wheat genotypes with a variant level of stress tolerance. Wild wheat relatives have been identified as a prominent source of several abiotic stress-tolerant genes. However, Aegilops species in the tertiary gene pool of wheat have not been well exploited as a source of B toxicity tolerance. This study explores the root and shoot growth, proline induction, and extent of lipid peroxidation in 19 Aegilops accessions comprising 6 different species and the B-tolerant check wheat cultivar Bolal 2973 grown under Control (3.1 μM B), toxic (1 mM B), and highly toxic (10 mM B) B stress treatment. B toxicity stress had a more decisive impact on growth parameters as compared to the malondialdehyde (MDA) and proline content. The obtained results suggested that even the genotypes with high shoot B (SB) accumulation can be tolerant to B toxicity stress, and the mechanism of B redistribution in leaves should be studied in detail. It has been proposed that the studied Aegilops accessions can be potentially used for genetically improving the B toxicity-tolerance trait due to a high level of variation in the response toward high B toxicity. Though a number of accessions showed suppression in the root and shoot growth, very few accessions with stress adaptive plasticity to B toxicity stress leading to an improvement of shoot growth parameters could be determined. The two accessions, Aegilops biuncialis accession TGB 026219 and Aegilops columnaris accession TGB 000107, were identified as the potential genotypes with B toxicity stress tolerance and can be utilized for developing a pre-breeding material in B tolerance-based breeding programs.

scholarly journals Toxicity of Zinc on Growth of an Aquatic Macrophyte, Ipomoea Aquatica Forsk

2016 ◽  
Vol 11 (1) ◽  
pp. 218-227 ◽  
Author(s):  
Laitonjam Chanu ◽  
Abhik Gupta
Keyword(s):  
Aquatic Ecosystems ◽  
Shoot Growth ◽  
Aquatic Macrophyte ◽  
Growth Parameters ◽  
Dry Weight ◽  
Fresh Weight ◽  
High Concentration ◽  
Carotene Content ◽  
Ipomoea Aquatica ◽  
Root And Shoot Growth

The effects of different concentrations of Zn on growth of an aquatic macrophyte, Ipomoea aquatica Forsk. were studied. Fresh weight, dry weight, shoot length, root length, number of nodes, development of leaves, and chlorophyll and carotene contents were the different growth parameters considered. Toxicity symptoms like browning and decaying of roots could be observed in plants treated at 22.7 mg L-1 Zn as early as 3rd day of experiment while yellowing of older leaves appeared during the later period of exposure. High concentration of Zn (12.71 – 22.7 mg L-1) significantly inhibited the growth of plant while lower Zn concentrations up to 4.09 mg L-1 enhanced its growth. However, at 7.26 mg L-1 Zn the chlorophyll as well as total carotene content in leaf of I. aquatica were significantly reduced from that in control on 5th day of exposure and subsequently the reduction was observed in lower concentrations. Thus, I. aquatica can be employed in biomonitoring of Zn polluted aquatic ecosystems using root browning, root and shoot growth inhibition, and chlorophyll and total carotene contents as sensitive biomarkers.

Isolation and identification of IAA producing endosymbiotic bacteria from Gracillaria corticata (J. Agardh)

2016 ◽  
Vol 5 (12) ◽  
pp. 5179
Author(s):  
Ilahi Shaik* ◽  
P. Janakiram ◽  
Sujatha L. ◽  
Sushma Chandra
Keyword(s):  
Acetic Acid ◽  
Culture Filtrate ◽  
Indole Acetic Acid ◽  
Shoot Growth ◽  
High Salinity ◽  
Saline Soils ◽  
Bacterial Strains ◽  
Isolation And Identification ◽  
Endosymbiotic Bacteria ◽  
Root And Shoot Growth

Indole acetic acid is a natural phytohormone which influence the root and shoot growth of the plants. Six (GM1-GM6) endosymbiotic bacteria are isolated from Gracilaria corticata and screened for the production of IAA out of six, three bacterial strains GM3, GM5 and GM6 produced significant amount of IAA 102.4 µg/ml 89.40 µg/ml 109.43 µg/ml respectively. Presence of IAA in culture filtrate of the above strains is further analyzed and confirmed by TLC. As these bacterial strains, able to tolerate the high salinity these can be effectively used as PGR to increase the crop yield in saline soils.

Effect of sand grain shape on root and shoot growth of wheat seedlings

Geoderma ◽  
2016 ◽  
Vol 265 ◽  
pp. 1-5 ◽  
Author(s):  
J. Lipiec ◽  
A. Siczek ◽  
A. Sochan ◽  
A. Bieganowski
Keyword(s):  
Shoot Growth ◽  
Grain Shape ◽  
Wheat Seedlings ◽  
Root And Shoot Growth

Circadian regulation of grapevine root and shoot growth and their modulation by photoperiod and temperature

2018 ◽  
Vol 222 ◽  
pp. 86-93 ◽  
Author(s):  
Kare P. Mahmud ◽  
Bruno P. Holzapfel ◽  
Yann Guisard ◽  
Jason P. Smith ◽  
Sharon Nielsen ◽  
...  
Keyword(s):  
Shoot Growth ◽  
Circadian Regulation ◽  
Root And Shoot Growth

scholarly journals Silicon reduces aluminum content in tissues and ameliorates its toxic effects on potato plant growth

2016 ◽  
Vol 46 (3) ◽  
pp. 506-512 ◽  
Author(s):  
Athos Odin Severo Dorneles ◽  
Aline Soares Pereira ◽  
Liana Verônica Rossato ◽  
Gessieli Possebom ◽  
Victória Martini Sasso ◽  
...  
Keyword(s):  
Chemical Element ◽  
Shoot Growth ◽  
Aluminum Content ◽  
Solanum Tuberosum L ◽  
Toxic Effects ◽  
Al Content ◽  
Potato Plants ◽  
High Affinity ◽  
Root And Shoot Growth ◽  
Tolerant Genotype

ABSTRACT: Aluminum (Al) is highly toxic to plants, causing stress and inhibiting growth and silicon (Si) is considered beneficial for plants. This chemical element has a high affinity with Al. The aim of this study was to investigate the potential of Si to mitigate the toxic effects of Al on potato ( Solanum tuberosum L.) plants and assess whether this behavior is different among genotypes with differing degrees of sensitivity to Al. Potato plants of the genotypes SMIJ319-7 (Al-sensitive) and SMIF212-3 (Al-tolerant) were grown for fourteen days in nutrient solution (without P and pH 4.5±0.1) under exposure to combinations of Al (0 and 1.85mM) and Si (0, 0.5 and 1.0mM). After this period, shoot and roots of the two genotypes were collected to determine Al content in tissues and assess morphological parameters of root and shoot growth. Roots of both genotypes accumulated more Al than shoots and the Al-tolerant genotype accumulated more Al than the sensitive one, both in roots and in shoot. Furthermore, the presence of 0.5 and 1.0mM Si together with Al reduced the Al content in shoot in both genotypes and in roots of the Al-tolerant genotype, respectively. Si ameliorated the toxic effects of Al with regard to number of root branches and leaf number in both potato genotypes. Si has the potential to mitigate the toxic effects of Al in potato plants regardless of Al sensitivity.

scholarly journals Genotypic differences in root and shoot growth of barley (Hordeum vulgare L.) grown under different salinity levels

Hereditas ◽  
2010 ◽  
Vol 147 (3) ◽  
pp. 114-122 ◽  
Author(s):  
H. Bchini ◽  
M. Ben Naceur ◽  
R. Sayar ◽  
H. Khemira ◽  
L. Ben Kaab-Bettaeïb
Keyword(s):  
Hordeum Vulgare ◽  
Shoot Growth ◽  
Genotypic Differences ◽  
Hordeum Vulgare L ◽  
Root And Shoot Growth ◽  
Salinity Levels
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