scholarly journals Knock-Down of CsNRT2.1, a Cucumber Nitrate Transporter, Reduces Nitrate Uptake, Root length, and Lateral Root Number at Low External Nitrate Concentration

2018 ◽  
Vol 9 ◽  
Author(s):  
Yang Li ◽  
Juanqi Li ◽  
Yan Yan ◽  
Wenqian Liu ◽  
Wenna Zhang ◽  
...  
Keyword(s):  
Root Length ◽  
Lateral Root ◽  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Nitrate Transporter ◽  
Root Number ◽  
Knock Down

Identification of Sugar Signals Controlling the Nitrate Uptake by Rice Roots Using a Noninvasive Technique

2009 ◽  
Vol 64 (9-10) ◽  
pp. 697-703 ◽  
Author(s):  
Shiyi Zhou ◽  
Xuan Gao ◽  
Changdong Wang ◽  
Guangxiao Yang ◽  
William John Cram ◽  
...  
Keyword(s):  
Gene Expression ◽  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Positive Control ◽  
Nitrate Transporter ◽  
Transporter Gene ◽  
Rt Pcr ◽  
Noninvasive Technique ◽  
Rice Roots ◽  
Nitrate Transporter Gene

In order to evaluate the hypothesis that nitrate uptake is under positive control by sugars, a simple noninvasive model was used to measure the effects of nine modulating sugars on the net nitrate uptake in rice under constant low nitrate concentration. The results showed that the fastest and greatest acceleration in nitrate uptake were observed after sucrose was added, and this change reached a peak 1.5 h after treatment. In addition, we found that 1 mM sucrose could affect the nitrate uptake in rice roots for 8.5 h. The three most positive effective sugars and one negative effective sugar were selected for further analyzing their effect on the expression of nitrate transporter gene OsNrt2.1. The result of RT-PCR showed that the expression of OsNrt2.1 was upregulated by sucrose, glucose and galactose. Among the three positive effective sugars tested, sucrose was found to have significant and continuous enhanced stimulation on OsNrt2.1 gene expression within 4 h, which indicated that sucrose could be as a specific signal to regulate the net nitrate uptake

scholarly journals Entomopathogen Metarhizium anisopliae promotes the early development of peanut root

2017 ◽  
Vol 53 (No. 2) ◽  
pp. 101-107 ◽  
Author(s):  
Liu Shao-Fang ◽  
Wang Guang-Jun ◽  
Nong Xiang-Qun ◽  
Liu Bin ◽  
Wang Miao-Miao ◽  
...  
Keyword(s):  
Early Development ◽  
Root Development ◽  
Metarhizium Anisopliae ◽  
Lateral Root ◽  
Plant Protection ◽  
Root Number ◽  
Gradual Decline ◽  
Significant Difference

The benefit of the entomopathogen Metarhizium anisopliae to early root development was evaluated. Two inoculating methods, conidia-suspension-drenching (T<sub>1</sub>) and conidia-coating (T<sub>2</sub>), were used when sowing peanut. The results showed that taproot length and lateral root number in T<sub>1</sub> significantly increased compared to the control (T<sub>0</sub>) in days 4–10 after treatment, whereas no significant difference was found between T<sub>2</sub> and T<sub>0</sub>. The fungal density by T<sub>1</sub> and T<sub>2</sub> fluctuated in the first 8 days, followed by a gradual decline. The ratio of the taproot length or lateral root number in T<sub>1 </sub>and T<sub>0</sub> was significant relative to the fungal persistence. It suggested that M. anisopliae promotes peanut root development and should be considered as important factor in plant protection besides pest controls.

scholarly journals Regulation of lateral root development by shoot-sensed far-red light via HY5 is nitrate-dependent and involves the NRT2.1 nitrate transporter

2021 ◽  
Author(s):  
Kasper van Gelderen ◽  
Chiakai Kang ◽  
Peijin Li ◽  
Ronald Pierik
Keyword(s):  
Root Growth ◽  
Root System ◽  
Lateral Root ◽  
Environmental Changes ◽  
Red Light ◽  
Agar Plate ◽  
Nitrate Transporter ◽  
Loss Of Function ◽  
Lateral Root Development ◽  
Nitrate Signaling

AbstractPlants are very effective in responding to environmental changes during competition for light and nutrients. Low Red:Far-Red (low R:FR)-mediated neighbor detection allows plants to compete successfully with other plants for available light. This above-ground signal can also reduce lateral root growth by inhibiting lateral root emergence, a process that might help the plant invest resources in shoot growth. Nitrate is an essential nutrient for plant growth and Arabidopsis thaliana responds to low nitrate conditions by enhancing nutrient uptake and reducing lateral and main root growth. There are indications that low R:FR signaling and low nitrate signaling can affect each other. It is unknown which response is prioritized when low R:FR light- and low nitrate signaling co-occur. We investigated the effect of low nitrate conditions on the low R:FR response of the A. thaliana root system in agar plate media, combined with the application of supplemental Far-Red (FR) light to the shoot. We observed that under low nitrate conditions main and lateral root growth was reduced, but more importantly, that the response of the root system to low R:FR was suppressed. Consistently, a loss-of-function mutant of a nitrate transporter gene NRT2.1 lacked low R:FR-induced lateral root reduction and its root growth was hypersensitive to low nitrate. ELONGATED HYPOCOTYL5 (HY5) plays an important role in the root response to low R:FR and we found that it was less sensitive to low nitrate conditions with regards to lateral root growth. In addition, we found that low R:FR increases NRT2.1 expression and that low nitrate enhances HY5 expression. HY5 also affects NRT2.1 expression, however, it depended on the presence of ammonium in which direction this effect was. Replacing part of the nitrogen source with ammonium also removed the effect of low R:FR on the root system, showing that changes in nitrogen sources can be crucial for root plasticity. Together our results show that nitrate signaling can repress low R:FR responses and that this involves signaling via HY5 and NRT2.1.

scholarly journals The Influence of Various Varieties and Various Liquid Organic Fertilizer to Papaya Plant Seed Growth (Carica papaya L.)

AGRIFOR ◽  
2018 ◽  
Vol 17 (1) ◽  
pp. 153
Author(s):  
Primadiyanti Arsela
Keyword(s):  
Root Length ◽  
Carica Papaya ◽  
Block Design ◽  
Organic Fertilizer ◽  
Root Number ◽  
Plant Seed ◽  
Randomized Block Design ◽  
Seed Growth ◽  
Two Factors ◽  
All Treatment

The main goal of the study was to determine the effect of various  Papaya varieties and liquid organic fertilizer on the growth of Papaya seedlings(Carica papaya L.). The research used Randomized Block Design (RAK) with two factors factorial experimental. The first factor is Variety (V) consists of 3 Papaya varieties: v1= bangkok , v2= red lady , v3= sunrise. The second factor is Fertilizer (C) consists of 3 brands: c1= Em4 10 ml, c2= Green Tonic 10ml, c3= Nasa 10ml. This study has 3 treatment levels consisting of 9 combinations and  repeated 3 times. The results of the study are treatment of various varieties (V) had significant effect on stem diameter and root number. The effect of various liquid organic fertilizer (C) had significant effect on the root length parameters. The interaction all treatment had a very significant effect on the root length and the root number parameter. 

Temporal variations in the rooting ability of cuttings of Populusbalsamifera and Salixplanifolia from natural clones–populations of subarctic Quebec

1993 ◽  
Vol 23 (12) ◽  
pp. 2603-2608 ◽  
Author(s):  
Gilles Houle ◽  
Patrice Babeux
Keyword(s):  
Root Length ◽  
Adventitious Roots ◽  
Growing Season ◽  
Temporal Variations ◽  
Bud Break ◽  
Root Number ◽  
Rooting Ability ◽  
Coefficients Of Variation ◽  
Site Restoration ◽  
Great Root

Temporal variations in the rooting ability of cuttings from five clones of Populusbalsamifera L. and five populations of Salixplanifolia Pursh from the Great Whale River valley in subarctic Quebec were determined. Cuttings were sampled monthly from May through October and rooted in a greenhouse. Root number and length of the longest root per cutting were determined 35 days after planting. There were significant variations among the six sampling dates in the rooting potential of cuttings of both species. A higher percentage of cuttings formed adventitious roots in May and June before or shortly after bud break than later, during the growing season; root number and length followed a similar trend. There was an increase in the rooting ability of cuttings of both species towards the fall period. Salixplanifolia produced more roots per cutting than P. balsamifera early in the season (i.e., May and June), but later in the season the differences between the two species were not great; root length showed no such trend. Differences among clones–populations in the rooting potential of cuttings were large for both species. Coefficients of variation for root number were lower in spring than later, during the growing season, for both P. balsamifera and S. planifolia. Seasonal trends in coefficients of variation for root length were not as evident as for root number. These results have significant implications for site restoration in the Subarctic. To optimize the rooting ability of cuttings and minimize the differences among clones–populations in rooting potential, cuttings should be sampled early in the season before bud break or shortly thereafter.

scholarly journals Strigolactones Control Root System Architecture and Tip Anatomy in Solanum lycopersicum L. Plants under P Starvation

Plants ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 612 ◽  
Author(s):  
Veronica Santoro ◽  
Michela Schiavon ◽  
Francesco Gresta ◽  
Andrea Ertani ◽  
Francesca Cardinale ◽  
...  
Keyword(s):  
Solanum Lycopersicum ◽  
Lateral Root ◽  
Primary Root ◽  
Root Traits ◽  
Root System Architecture ◽  
Root Tip ◽  
Root Number ◽  
Wild Type ◽  
Solanum Lycopersicum L ◽  
P Supply

The hormones strigolactones accumulate in plant roots under phosphorus (P) shortage, inducing variations in plant phenotype. In this study, we aimed at understanding whether strigolactones control morphological and anatomical changes in tomato (Solanum lycopersicum L.) roots under varying P supply. Root traits were evaluated in wild-type seedlings grown in high vs. low P, with or without exogenous strigolactones, and in wild-type and strigolactone-depleted plants grown first under high vs. no P, and then under high vs. no P after acclimation on low P. Exogenous strigolactones stimulated primary root and lateral root number under low P. Root growth was reduced in strigolactone-depleted plants maintained under continuous P deprivation. Total root and root hair length, lateral root number and root tip anatomy were impaired by low strigolactone biosynthesis in plants grown under low P or transferred from low to no P. Under adequate P conditions, root traits of strigolactone-depleted and wild-type plants were similar. Concluding, our results indicate that strigolactones (i) control macro- and microscopic changes of root in tomato depending on P supply; and (ii) do not affect root traits significantly when plants are supplemented with adequate P, but are needed for acclimation to no P and typical responses to low P.

scholarly journals The Use of Bean Sprout Extract as Supplement for the Growth of Plaintain Unti Sayang (Musa paradisiaca L.) by Tissue Culture

2014 ◽  
Vol 2 (1) ◽  
pp. 99
Author(s):  
Nirwana Jufri ◽  
Dr. Abdullah ◽  
Devi Susanti
Keyword(s):  
Tissue Culture ◽  
Root Length ◽  
Culture Media ◽  
Leaf Number ◽  
Wide Field ◽  
Root Number ◽  
Bean Sprout ◽  
Musa Paradisiaca ◽  
Tissue Culture Media ◽  
Growth Quality

One of the problems in plaintain development is on the plant breeding that has been conducted convensionally by using seedlings, so that it requires time and wide field, different treatment, and potentially brings pests and deseases. The bean sprout extract is potentially useful in improving the explant growth quality of plaintain by tissue culture. This study aims to know the influence of bean sprout extract concentration as supplement in tissue culture media upon the explant growth of plaintain Unti sayang (Musa paradisiaca L). There are 4 dosages of bean sprout extract as control. The data was analyzed by using ANOVA and was continued by using BNJ test. The result of the experiment shows that the bean sprout extract influences significatly on the plantlets height, leaf number, root length, and root number. The dosage of 100 g/l and 200 g/l bean sprout extracts provide the best result on the experimenting component of plantlet height, leaf number, root length, and root number. Meanwhile, the experimenting component of leaf number and the wet weight of the plantlets provide the best result on MS without any addition of bean sprout extract.

NaCl salinity affects lateral root development in Plantago maritima

2004 ◽  
Vol 31 (8) ◽  
pp. 775 ◽  
Author(s):  
Michael Rubinigg ◽  
Julia Wenisch ◽  
J. Theo M. Elzenga ◽  
Ineke Stulen
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Root Length ◽  
Lateral Root ◽  
Lateral Roots ◽  
Third Order ◽  
Lateral Root Primordia ◽  
Relative Growth ◽  
Length Growth ◽  
Lateral Root Length

Root growth and morphology were assessed weekly in hydroponically-grown seedlings of the halophyte Plantago maritima L. during exposure to 0, 50, 100 and 200 mm NaCl for 21 d. Relative growth rate was reduced by 25% at 200 mm NaCl. The lower NaCl treatments did not affect relative growth rates. Primary and lateral roots responded differently to NaCl. While primary-root length increased at all NaCl concentrations, total lateral-root length increased at 50 and was not affected at 100 mm but was considerably reduced at 200 mm NaCl. NaCl concentrations of 50 and 100 mm, which had no effect on relative growth rate or total lateral-root length, severely affected root branching pattern in that the number of first, second and third order laterals was reduced. At 200 mm NaCl third order laterals were not formed at all. However, mean lateral-root length was increased at all NaCl concentrations and was highest at 200 mm NaCl. We conclude that the increase in total lateral-root length in plants at 50 and 100 mm NaCl was mainly caused by increased length growth, while the decrease in total lateral-root length at 200 mm was the consequence of inhibition of lateral root primordia and / or the activation of apical meristems rather than reduced length growth.

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