Root growth dynamics of Vicia faba and its implication with the K supply

AbstractThe root system is a major determinant of plant fitness. Its capacity to supply the plant with sufficient water and nutrients strongly depends on root system architecture, which arises from the repeated branching off of lateral roots. A critical first step in lateral root formation is priming, which prepatterns sites competent of forming a lateral root. Priming is characterized by temporal oscillations in auxin, auxin signalling and gene expression in the root meristem, which through growth become transformed into a spatially repetitive pattern of competent sites. Previous studies have demonstrated the importance of auxin synthesis, transport and perception for the amplitude of these oscillations and their chances of producing an actual competent site. Additionally, repeated lateral root cap apoptosis was demonstrated to be strongly correlated with repetitive lateral root priming. Intriguingly, no single mutation has been identified that fully abolishes lateral root formation, and thusfar the mechanism underlying oscillations has remained unknown. In this study, we investigated the impact of auxin reflux loop properties combined with root growth dynamics on priming, using a computational approach. To this end we developed a novel multi-scale root model incorporating a realistic root tip architecture and reflux loop properties as well as root growth dynamics. Excitingly, in this model, repetitive auxin elevations automatically emerge. First, we show that root tip architecture and reflux loop properties result in an auxin loading zone at the start of the elongation zone, with preferential auxin loading in narrow vasculature cells. Second, we demonstrate how meristematic root growth dynamics causes regular alternations in the sizes of cells arriving at the elongation zone, which subsequently become amplified during cell expansion. These cell size differences translate into differences in cellular auxin loading potential. Combined, these properties result in temporal and spatial fluctuations in auxin levels in vasculature and pericycle cells. Our model predicts that temporal priming frequency predominantly depends on cell cycle duration, while cell cycle duration together with meristem size control lateral root spacing.

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Genetic variability for root morph-architecture traits and root growth dynamics as related to phosphorus efficiency in soybean

Functional Plant Biology ◽

10.1071/fp09215 ◽

2010 ◽

Vol 37 (4) ◽

pp. 304 ◽

Cited By ~ 49

Author(s):

Junhua Ao ◽

Jiabing Fu ◽

Jiang Tian ◽

Xiaolong Yan ◽

Hong Liao

Keyword(s):

Genetic Variability ◽

Root Growth ◽

Recombinant Inbred Lines ◽

Growth Dynamics ◽

Root Traits ◽

Phosphorus Efficiency ◽

P Efficiency ◽

Glycine Max L ◽

Positive Correlations

Root morphology and architecture are believed to be important for plant phosphorus (P) efficiency, but their genetic information is relatively scarce. In the present study, a field and a specially designed minirhizotron experiments were conducted using two soybean (Glycine max L. Merr.) genotypes and their 88 recombinant inbred lines (RILs) to elucidate the genetic variability for root morph-architecture traits and root growth dynamics as related to P efficiency in soybean. The results indicated that the root morph-architecture traits were continually segregated in the RILs with a normal distribution, indicating which are possibly controlled by quantitative trait loci. Significantly positive correlations were found between root and P traits, suggesting feasibility of screening P efficient genotype through simple selection of root traits in field. Most root morph-architecture traits were closely correlated, showing a coordinating contribution to P efficiency. Furthermore, root morphological traits always had higher heritability than architecture traits, thus, could serve as more reliable index in field selection. The dynamic parameters of root growth from the minirhizotron experiment showed that the P efficient genotype established longer and larger root system with preferring distribution in surface layer and also kept more active roots, therefore, had a better growth performance in field, than the P-inefficient genotype. Taken together, this is the first report on in situ root growth dynamics and its relation to P efficiency using minirhizotron systems in crops. Our findings help to better understand the relationships between P efficiency and root traits and, thus, facilitate development of P efficient genotypes in crops.

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Modelling the effect of varying soil water on root growth dynamics of annual crops

Plant and Soil ◽

10.1007/bf02257569 ◽

1996 ◽

Vol 185 (1) ◽

pp. 125-135 ◽

Cited By ~ 17

Author(s):

S. G. K. Adiku ◽

R. D. Braddock ◽

C. W. Rose

Keyword(s):

Root Growth ◽

Soil Water ◽

Growth Dynamics ◽

Annual Crops

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Root Growth Dynamics, Dominant Rhizosphere Bacteria, and Correlation Between Dominant Bacterial Genera and Root Traits Through Brassica napus Development

Plant and Soil ◽

10.1007/s11104-022-05296-6 ◽

2022 ◽

Author(s):

Zelalem M. Taye ◽

Kalli Noble ◽

Steven D. Siciliano ◽

Bobbi L. Helgason ◽

Eric G. Lamb

Keyword(s):

Brassica Napus ◽

Root Growth ◽

Growth Dynamics ◽

Root Traits ◽

Rhizosphere Bacteria

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Some Effects of Boron on Root Growth

Australian Journal of Biological Sciences ◽

10.1071/bi9600232 ◽

1960 ◽

Vol 13 (3) ◽

pp. 232 ◽

Cited By ~ 27

Author(s):

TF Neales

Keyword(s):

Growth Rate ◽

Root Growth ◽

Vicia Faba ◽

Linear Growth ◽

Field Bean ◽

Free Medium ◽

Radicle Elongation

The absence of boron in the root environment reduced the total linear growth of the radicles of the four dicotyledon and one monocotyledon species studied. After growth for 4 days in a boron-free medium, the growth rate of the maize radicle was comparable to that in a plus-boron medium, whilst the growth of the field bean radicle ceased. The minimum boron requirement for the unrestricted growth of the field bean (Vicia faba val'. minor) radicle over 120 hI' was 0�005 p.p.m. B. Each microgram of boron in this medium evoked a mean radicle elongation of 51 mm.

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Root growth dynamics during recovery of tropical mountain forest in North-east India

Journal of Mountain Science ◽

10.1007/s11629-018-5303-9 ◽

2019 ◽

Vol 16 (10) ◽

pp. 2335-2347 ◽

Cited By ~ 3

Author(s):

Chalthleng Lalnunzira ◽

Francis Q. Brearley ◽

Shri Kant Tripathi

Keyword(s):

Root Growth ◽

Growth Dynamics ◽

Mountain Forest ◽

North East India ◽

North East ◽

Tropical Mountain

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Seasonal growth dynamics and carbon allocation of the wild blueberry plant (Vaccinium angustifolium Ait.)

Canadian Journal of Plant Science ◽

10.4141/cjps2011-204 ◽

2012 ◽

Vol 92 (6) ◽

pp. 1145-1154 ◽

Cited By ~ 11

Author(s):

Jatinder Kaur ◽

David Percival ◽

Lindsay J. Hainstock ◽

Jean-Pierre Privé

Keyword(s):

Root Growth ◽

Carbon Allocation ◽

Growth Dynamics ◽

Dry Weight ◽

Ground Vegetation ◽

Seasonal Growth ◽

Carbohydrate Source ◽

Vaccinium Angustifolium ◽

Stems And Leaves ◽

Wild Blueberry

Kaur, J., Percival, D., Hainstock, L. J. and Privé, J.-P. 2012. Seasonal growth dynamics and carbon allocation of the wild blueberry plant ( Vaccinium angustifolium Ait.). Can. J. Plant Sci. 92: 1145–1154. Field studies were conducted at the Wild Blueberry Research Station, Debert, NS, to examine the carbon allocation dynamics within the wild blueberry (Vaccinium angustifolium Ait.). This was achieved with biweekly measurements of dry weight, soluble sugar and starch levels of the rhizomes, roots, stems/leaves and berries of plants in the vegetative (i.e., sprout phase) and cropping phases of production. Non-structural carbohydrate levels were determined using high-performance liquid chromatography (HPLC). Growth parameters included phenology, stem height, dry weights of the above-ground vegetation (stems and leaves), berries, rhizomes and roots. Interestingly, root growth was observed prior to upright shoot emergence and dry weight for rhizome remained higher compared with stems and leaves. The rhizomes acted as a carbohydrate source during stem and root growth. The developing berry crop appeared to be a strong sink for photo-assimilates, as berries were found to import sucrose and convert it to fructose and glucose during maturation, and HPLC studies further confirmed the increasing levels of fructose and glucose. Given the phenology of the wild blueberry, the results exemplify the importance of the rhizomes as a strong carbohydrate source, especially in the early stages of a growing season when the carbohydrate production is limited.

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The Rejoining Time of Chromatid Breaks Induced by Gamma Radiation in Vicia faba Root Tips at 3 °C

The Journal of Cell Biology ◽

10.1083/jcb.7.1.79 ◽

1960 ◽

Vol 7 (1) ◽

pp. 79-85 ◽

Cited By ~ 5

Author(s):

J. R. K. Savage ◽

G. J. Neary ◽

H. J. Evans

Keyword(s):

Root Growth ◽

Vicia Faba ◽

Low Dose ◽

Root Meristem ◽

Root Tips ◽

Dose Rates ◽

Low Dose Rate ◽

Chromatid Aberration ◽

Γ Rays ◽

Chromatid Aberrations

The observation was made previously that the reduction in radiosensitivity in Vicia faba (as measured by postirradiation root growth) by prolonging the exposure time from about 10 minutes to 24 hours is much less marked at 3°C. than at 19°C. If chromosome damage is mainly responsible for the reduced root growth, this observation might be explained by a smaller drop in the "two-hit" aberration component, resulting from an increased time for which breaks are available for rejoining at 3°C. This hypothesis was tested by comparing chromatid aberration frequencies in root meristem cells produced by 105 rads of 60Co γ rays, given at dose rates of 19.4 and 0.073 rads per minute. Beans were maintained in aerated water at 2°C. prior to and during irradiation, and at this temperature the rate of development of cells was such that the two different exposure times both occupied a period during which the cell sensitivity was approximately constant. Immediately subsequent to irradiation, the roots were returned to 19°C. and examined cytologically. All chromatid aberrations were less frequent after low dose rate treatment, but only the chromatid interchange reduction was significant. The average time for which breaks are available for reunion, calculated from Lea's G function, was found to be 12 hours (95 per cent C.L. 6 to 24 hours).

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