ACID EFFLUX PATTERNS OF PRIMARY AND LATERAL ROOTS OF PHASEOLUS VULGARIS (FABACEAE)

1984 ◽  
Vol 71 (8) ◽  
pp. 1168-1170 ◽  
Author(s):  
Randy Moore
Keyword(s):  
Phaseolus Vulgaris ◽  
Lateral Roots ◽  
Primary And Lateral Roots

Geoperception in primary and lateral roots of Phaseolus vulgaris (Fabaceae). II. Intracellular distribution of organelles in columella cells

1984 ◽  
Vol 62 (5) ◽  
pp. 1090-1094 ◽  
Author(s):  
J. Steven Ransom ◽  
Randy Moore
Keyword(s):  
Phaseolus Vulgaris ◽  
Lateral Roots ◽  
Relative Volume ◽  
Precise Location ◽  
Primary Roots ◽  
Columella Cells ◽  
Primary And Lateral Roots ◽  
Cellular Components

A morphometric analysis of the ultrastructures of columella cells in primary and lateral roots of Phaseolus vulgaris was performed to determine the precise location of cellular components in these cells. Roots were fixed in situ to preserve the in vivo ultrastructure of the cells. All cellular components in columella cells of both types of roots were distributed asymmetrically. The nucleus and vacuome were located primarily in the middle third of both types of columella cells. Dictyosomes, mitochondria, and amyloplasts were most abundant in the lower third of the columella cells in both types of roots. The distribution of amyloplasts was the most asymmetrical of all cellular components examined, with the lower third of the columella cells containing approximately 90% of the relative volume of amyloplasts in both types of roots. The distribution of cellular components in columella cells of primary roots was not significantly different from that of columella cells of lateral roots. These results indicate that differences in georesponsiveness of primary and lateral roots of P. vulgaris are probably due to factors other than the ultrastructures of their individual columella cells.

Geoperception in primary and lateral roots of Phaseolus vulgaris (Fabaceae). III. A model to explain the differential georesponsiveness of primary and lateral roots

1985 ◽  
Vol 63 (1) ◽  
pp. 21-24 ◽  
Author(s):  
J. Steven Ransom ◽  
Randy Moore
Keyword(s):  
Phaseolus Vulgaris ◽  
Concentration Gradient ◽  
Lateral Root ◽  
Lateral Roots ◽  
Primary Root ◽  
Growth Inhibitors ◽  
Gravitropic Response ◽  
Primary Roots ◽  
Primary And Lateral Roots

Half-tipped primary and lateral roots of Phaseolus vulgaris bend toward the side of the root on which the intact half tip remains. Therefore, tips of lateral and primary roots produce growth effectors capable of inducing gravicurvature. The asymmetrical placement of a tip of a lateral root onto a detipped primary root results in the root bending toward the side of the root onto which the tip was placed. That is, the lesser graviresponsiveness of lateral roots as compared with primary roots is not due to the inability of their caps to produce growth inhibitors. The more pronounced graviresponsiveness of primary roots is positively correlated with the presence of columella tissues that are 3.8 times longer, 1.7 times wider, and 10.5 times more voluminous than the columellas of lateral roots. We propose that the lack of graviresponsiveness exhibited by lateral roots is due to the facts that they (i) produce smaller amounts of the inhibitor than primary (i.e., strongly graviresponsive) roots and (ii) are unable to redistribute the inhibitor so as to be able to create a concentration gradient sufficient to induce a pronounced gravitropic response.

scholarly journals Spatiotemporal Pattern of Ectopic Cell Divisions Contribute to Mis-Shaped Phenotype of Primary and Lateral Roots of katanin1 Mutant

2020 ◽  
Vol 11 ◽  
Author(s):  
Miroslav Ovečka ◽  
Ivan Luptovčiak ◽  
George Komis ◽  
Olga Šamajová ◽  
Despina Samakovli ◽  
...  
Keyword(s):  
Lateral Roots ◽  
Spatiotemporal Pattern ◽  
Cell Divisions ◽  
Primary And Lateral Roots

Effect of organic pollutant treatment on the growth of pea and maize seedlings

2012 ◽  
Vol 7 (1) ◽  
pp. 159-166 ◽  
Author(s):  
Marie Kummerová ◽  
Štěpán Zezulka ◽  
Lucie Váňová ◽  
Helena Fišerová
Keyword(s):  
Zea Mays ◽  
Seed Germination ◽  
Lateral Roots ◽  
Organic Pollutant ◽  
Primary Root ◽  
Dry Weight ◽  
Considerable Effect ◽  
Maize Seedlings ◽  
Polycyclic Aromatic ◽  
Primary And Lateral Roots

AbstractThis study confirmed the considerable effect of polycyclic aromatic hydrocarbon fluoranthene (FLT; 0.01, 0.1, 1, 4 and 7 mg/l) exposure on the germination of seeds, growth and root morphology of seedlings in Zea mays and Pisum sativum. Seed germination was significantly inhibited at FLT≥0.01 mg/l in maize and at ≥1 mg/l in pea. The amount of released ethylene after 3 days of germination was significantly increased in both species at FLT≥0.1 mg/l. After 7 days of seedling cultivation a significant decrease in the dry weight of roots and shoots occurred in maize at FLT≥0.1 mg/l while in pea similar effect was observed at ≥1 mg/l. The total length of primary and lateral roots was significantly reduced by FLT≥1 mg/l in maize and by 4 and 7 mg/l in pea. The length of the non-branched part of the primary root was significantly reduced by FLT≥0.1 mg/l in maize and ≥0.01 mg/l in pea. In both species the number of lateral roots was significantly increased at FLT≤1 mg/l and inhibited at concentrations of 4 and 7 mg/l. Fluoranthene content in roots and shoots of both species positively correlated with the FLT treatment.

scholarly journals Influence of Indolebutyric Acid Potassium Salt on Propagation of Semi-hardwood Stem Cuttings of Bougainvillea

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 983D-983
Author(s):  
Christopher B. Cerveny ◽  
James L. Gibson
Keyword(s):  
Potassium Salt ◽  
Lateral Roots ◽  
Tropical Species ◽  
Stem Cuttings ◽  
Indolebutyric Acid ◽  
Percent Survival ◽  
Industry Standard ◽  
Primary Roots ◽  
Napthaleneacetic Acid ◽  
Primary And Lateral Roots

Bougainvillea glabra is a tropical species with reportedly difficulty to propagate. Previous research has shown the importance of talc-based rooting hormones when propagating Bougainvillea, yet little has been published on the efficacy of liquid-based formulations. Therefore, our objective was to determine the optimum concentration of indolebutyric acid potassium salt (KIBA) needed to effectively root semi-hardwood stem cuttings of Bougainvillea `California Gold' and `Helen Johnson'. Sub-terminal cuttings measuring 6.5 cm were harvested from stock plants of Bougainvillea on 3-week intervals from 6 June to 8 Aug. and repeated 6 Sept. to 8 Nov. 2005. Cuttings were dipped 0.5 cm in a solution of 0, 1500, 3000, or 6000 mg·L-1 KIBA or in a 1500-mg·L-1 solution containing indolebutyric acid (IBA) 1%: napthaleneacetic acid (NAA) 0.5% and propagated under mist. Cuttings were evaluated for percent survival, rooting quality (1 = poor; 5 = best), and number of primary and lateral roots 5 weeks after planting (WAP). Differences in `California Gold' for percent survival, average rank, and number of roots were determined not significant at P ≤ 0.05. However, application of rooting hormone to `Helen Johnson' increased rooting quality, number of primary roots, and number of lateral roots by up to 24%, 53%, and 50%, respectively. Results indicated rooting performance was generally improved with application of KIBA; therefore, cuttings of Bougainvillea may benefit from a 1500-mg·L-1 solution. KIBA was also found to be as effective as the industry standard liquid formulation. Growers will have to consider the availability and cost of KIBA when propagating Bougainvillea.

scholarly journals Impact of soil compaction heterogeneity and moisture on maize (Zea mays L.) root and shoot development

2008 ◽  
Vol 54 (No. 12) ◽  
pp. 509-519 ◽  
Author(s):  
B. Konôpka ◽  
L. Pagès ◽  
C. Doussan
Keyword(s):  
Zea Mays ◽  
Soil Moisture ◽  
Soil Compaction ◽  
Statistical Tests ◽  
Lateral Roots ◽  
Primary Root ◽  
Leaf Biomass ◽  
Fine Soil ◽  
Primary Roots ◽  
Primary And Lateral Roots

Soil compaction heterogeneity and water content are supposed to be decisive factors influencing plant growth. Our experiment focused on simulation of two soil moisture levels (0.16 and 0.19 g/g) plus two levels of clod proportion (30 and 60% volume) and their effects on root and leaf variables of maize (<I>Zea mays</I> L.). We studied number of primary and lateral roots as well as primary root length at the particular soil depths. Statistical tests showed that the decrease rate of the number of roots versus depth was significantly affected by the two studied factors (<I>P</I> < 0.01). Soil moisture and clod occurrence, interactively, affected leaf biomass (<I>P</I> = 0.02). Presence of clods modified root morphological features. Particularly, the diameter of primary roots in the clods was significantly higher than of those grown in fine soil (<I>P</I> < 0.01). For primary roots, which penetrated clods, branching density decreased considerably for the root segments located just after the clods (<I>P</I> = 0.01). Regarding their avoidance to clods and tortuosity, large differences were found between primary roots grown in the contrasting soil environments.

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