scholarly journals Diversity of roots and root systems in pauciennial dicots

2021 ◽  
pp. 107-133
Author(s):  
Михаил Витальевич Марков ◽  
Виолетта Закировн Юсуфова ◽  
Татьяна Андреевна Шестова ◽  
Дмитрий Олегович Грушенков
Keyword(s):  
Root Morphology ◽  
Lateral Roots ◽  
Root Systems ◽  
Negative Influence ◽  
Flowering Plant ◽  
Plant Group ◽  
Full Picture ◽  
Biennial Plants ◽  
Natural Diversity ◽  
Group Diversity

Исторически сложившийся в ботанике стереотип представлений об аллоризном строении корней и корневых систем малолетних (одно-двулетних) растений из класса Двудольных может стать серьезной помехой для объективной оценки разнообразия этой интереснейшей группы жизненных форм цветковых растений. При более внимательном изучении морфологии и анатомии корней в динамике их онтогенетического развития выявляется существенная неполнота наших знаний в этой области и отсутствие необходимого уровня развития терминологии, которые сказываются на содержательности изданных учебных пособий. Рассмотренные в этих пособиях хрестоматийные примеры дают далеко не полную картину природного разнообразия морфологической и анатомической структуры корней и в них, часто бывают недооценены или просто опущены важные детали в процессе их развития. К числу таких деталей относится коллет - структура в переходной зоне между главным корнем и гипокотилем, которой свойственна своя анатомия и морфология (развитие волосков или ризоидов), включая примордии боковых корней, закладывающихся внутри коллета иногда еще в ходе эмбриогенеза. Historically borned stereotype on allorhizy of pauciennial (annual-biennial) plants from Dicots can be valuable interference for objective representations (describing) of this extremely interesting flowering plant group diversity. Via more attentive and deep research of the morphology and anatomy of roots in their ontogenetic development dynamics we can observe (reveal) ncompleteness of our knowledge in this area and unsufficient level of terminology which could have negative influence on our published text-books content. Hackneyed examples that were presented in these text-books can illustrate far from the full picture of natural diversity of root morphology and anatomy with some valuable details of their development obviously underestimated or simply omitted. There is a collet amongst these details - more or less inflated transition zone between radicle and hypocotyl with its own anatomy and morphology features (cover from trichomes or rhyzoides), including lateral roots primordia which can be initiated inside even during embryogenesis.

scholarly journals Understanding Root Systems to Improve Seedling Quality

1998 ◽  
Vol 8 (4) ◽  
pp. 544-549 ◽  
Author(s):  
Silvana Nicola
Keyword(s):  
Root Growth ◽  
Root System ◽  
Seedling Growth ◽  
Root Morphology ◽  
Root Architecture ◽  
Lateral Roots ◽  
Root Systems ◽  
The Third ◽  
Observation Methods ◽  
Different Types

Root architecture can be very important in plant productivity. The importance of studies on root morphology and development is discussed to improve seedling growth. Root systems of dicotyledonous species are reviewed, with emphasis on differences between growth of basal and lateral roots. The presence of different types of roots in plant species suggests possible differences in function as well. The architecture of a root system related to its functions is considered. Classical methods for studying root systems comprise excavation of root system, direct observation, and indirect analyses. While the first method is destructive and the third is effective in understanding root architecture only on a relatively gross scale, observation methods allow the scientist a complete a nondestructive architectural study of a root system. The three groups are reviewed related to their potential to give valuable information related to the root architecture and development of the seedling, with emphasis on the availability of a medium-transparent plant-growing system, enabling nondestructive daily observations and plant measurements under controlled environmental conditions. Effects of CO2 enrichment on seedling growth is reviewed, emphasizing the effects of CO2 on root growth.

Effects of Temperature on Root Morphology and Ectendomycorrhizal Development in Pinusresinosa Ait.

1975 ◽  
Vol 5 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Hugh E. Wilcox ◽  
Ruth Ganmore-Neumann
Keyword(s):  
Root Growth ◽  
Root System ◽  
Root Morphology ◽  
Root Systems ◽  
Second Order ◽  
Root Temperature ◽  
First Order ◽  
Effects Of Temperature

Seedlings of Pinusresinosa were grown at root temperatures of 16, 21 and 27 °C, both aseptically and after inoculation with the ectendomycorrhizal fungus BDG-58. Growth after 3 months was significantly influenced by the presence of the fungus at all 3 temperatures. The influence of the fungus on root growth was obscured by the effects of root temperature on morphology. The root system at 16 and at 21 °C possessed many first-order laterals with numerous, well developed second-order branches, but those at 27 °C had only a few, relatively long, unbranched first-order laterals. Although the root systems of infected seedlings were larger, the fungus increased root growth in the same pattern as determined by the temperature.

scholarly journals Planting Depth Affects Root Form of Three Shade Tree Cultivars in Containers

2010 ◽  
Vol 36 (3) ◽  
pp. 132-139
Author(s):  
Edward Gilman ◽  
Chris Harchick ◽  
Maria Paz
Keyword(s):  
Root Morphology ◽  
Adventitious Root ◽  
Substrate Surface ◽  
Root Systems ◽  
Planting Depth ◽  
Trunk Diameter ◽  
Shade Tree ◽  
Container Wall ◽  
Stem Girdling

Study was designed to evaluate impact of planting depth on root morphology inside nursery containers. Trees were planted shallow (13 mm) or deep (64 mm) into #3 Air-Pot™ containers, then shallow (0 mm) or deep (64 mm) into #15 containers prior to shifting them to their final #45 container size at the same depth. Trunk diameter (caliper) was significantly larger for both magnolia and maple planted shallow (13 mm) into #3, and then shallow into #15 containers when compared to planting deeper. However, differences were small and may not be relevant to a grower. No caliper or height differences among planting depths were found for elm. Presence of stem girdling roots in elm and magnolia growing in #45 containers increased with planting depth into # 3 containers. Downward re-orientation of main roots comprising the flare by #3 container wall, likely contributed to amount of roots growing over root flare. Maple root systems were not impacted by planting depth into #3 primarily due to adventitious root emergence from the buried portion of stem. Distance between substrate surface and top of root flare in finished #45 containers was not impacted by planting depth into #3 containers for any species. Planting elm and maple deeply into #15 led to more trunk-girdling by roots, a deeper root flare, and more roots growing over flare compared to planting shallow. Most root defects in all species were hidden from view because they were found below substrate surface. Presence of a visible root flare was not related to occurrence of root defects. Root balls on elm and maple were packed with roots which made it time consuming to remove substrate and roots above the root flare. Planting depth appears most crucial when shifting into #15 containers.

scholarly journals Image analysis techniques to characterise white clover root morphology

1998 ◽  
pp. 187-191
Author(s):  
Debbie Care ◽  
Shirley Nichols ◽  
Derek Woodfield
Keyword(s):  
Image Analysis ◽  
White Clover ◽  
Root Morphology ◽  
Root Systems ◽  
Solution Culture ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Analysis Techniques ◽  
Clover Root ◽  
Image Analysis Techniques

The use of low-ionic-strength hydroponic culture and image analysis techniques to discriminate and isolate morphologically distinct, genetically differentiated root types within white clover is described. Advantages of this method include the ability to view the genetic expression of the root systems without the modifying effects of growth in soil, to examine the growth and structure of roots over time, and to store the images for further examination. It is recognised that although the root systems grow in three dimensions, they are constrained to two dimensions by the flatbed scanner. However, the morphological parameters determined by image analysis would not be altered whether this analysis was measured in two or three dimensions. Keywords: image analysis, root morphology, solution culture, Trifolium repens

scholarly journals Allocation of added selenium in lettuce and its impact on roots

2003 ◽  
Vol 12 (3-4) ◽  
pp. 155-164 ◽  
Author(s):  
A. SIMOJOKI ◽  
T. XUE ◽  
K. LUKKARI
Keyword(s):  
Root Morphology ◽  
Specific Volume ◽  
Dry Matter ◽  
Lateral Roots ◽  
Large Scatter ◽  
Growth Responses ◽  
Endogenous Ethylene ◽  
Morphological Variables ◽  
Length And Area ◽  
Growing Conditions

Allocation of selenium (Se) in lettuce and its impact on root morphology were studied to better understand the growth responses of plants to added Se. Lettuce was grown in vermiculite under controlled growing conditions for seven weeks, and the allocation in the shoots and roots of selenate added in increasing dosages (0, 1, 10, 100, 500 and 1000 µg Se per 3.5-litre pot) as well as morphological variables of the roots were determined. The intermediate additions of 100 and 500 µg Se per pot seemed to produce the highest biomasses, although this was nearly masked by large scatter in the data. The Se contents both in roots and shoots increased roughly proportionally to the amount of Se added. However, at small additions Se was preferentially allocated to roots, whereas at larger additions the contents in roots and shoots (mg kg-1 dry matter) were roughly equal. Se treatments did not change the morphology of hypocotyls. On the contrary, the specific length and area of basal and lateral roots were smallest at intermediate Se additions, whereas the specific volume was largest at the largest Se addition. These effects of Se on root morphology were, however, not unambiguously related to plant growth. As the Se contents in roots increased, the roots grew thicker and the specific volume of lateral roots increased in agreement with a hypothesis of increased endogenous ethylene production.;

scholarly journals Influence of Root Morphology on Ecological Slope Protection

2020 ◽  
Vol 198 ◽  
pp. 04036
Author(s):  
JI Xiaolei ◽  
XU Lanlan ◽  
YANG Guoping
Keyword(s):  
Root Morphology ◽  
Lateral Root ◽  
Lateral Roots ◽  
Soil Mass ◽  
Soil Reinforcement ◽  
Main Root ◽  
Protection Effect ◽  
Included Angle ◽  
Theoretical Support ◽  
Object Based

Ecological slope protection is of great importance for preventing the water and soil loss on bare slopes, improving the ecological environment, and realizing the sustainable ecosystem development. The root-soil composite slope consisting of homogenous soil mass and oleander root system was taken as the study object. Based on the mechanics principle of soil reinforcement by roots in ecological slope protection, the influences of the lateral root quantity of plants and included angle between main root and lateral root on the slope protection were investigated via the finite element (FE) software ABAQUS. The simulation results show that the larger the quantity of lateral roots, the more obvious the displacement reduction of the soil mass on the slope surface will be. The slope protection effect varies with the root morphology, the included angle between main root and lateral root is an important factor influencing the slope protection effect of plants, and the slope protection effect at included angle of 30° is apparently superior to that at 90°. The research results can provide a theoretical support for the plant selection in the ecological slope protection.

scholarly journals Root biomass of beech as a factor influencing the wind tree stability 

2019 ◽  
Vol 48 (No. 12) ◽  
pp. 549-564 ◽  
Author(s):  
J. Kodrík ◽  
M. Kodrík
Keyword(s):  
Root System ◽  
Groundwater Level ◽  
Negative Impact ◽  
Lateral Roots ◽  
Root Systems ◽  
Static Stability ◽  
Soil Conditions ◽  
Tree Stability ◽  
Ground Biomass ◽  
Below Ground

Beech is, thanks to its root system, in general considered to be a wind-resistant woody plant species. Nevertheless, the research on beech root systems has revealed that it is not possible to mechanically divide the woody plants into deep rooted and shallow rooted, because their root systems are modified according to various stand conditions. The root system shape, growth and development are mostly influenced by soil conditions and groundwater level. In the case of a high groundwater level beech root systems do not form tap roots and the lateral roots are rather thin and weak. Important factor for the tree static stability is number of roots with diameter 3–10 cm. The most important for the tree stability are roots with diameter over 10 cm. Wood-destroying fungi have strong negative impact on tree static stability. There are differences between beech below-ground biomass growing in soils rich in nutrients and poor in nutrients. The total below-ground biomass of the beech stands poor in nutrients is higher.

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