scholarly journals A Model of the Extension and Branching of a Seminal Root of Barley, and Its Use in Studying Relations Between Root Dimensions I. the Model

1972 ◽  
Vol 25 (4) ◽  
pp. 669 ◽  
Author(s):  
C Hackett ◽  
DA Rose
Keyword(s):  
Hordeum Vulgare ◽  
Root Growth ◽  
Surface Area ◽  
Vegetative Growth ◽  
Seminal Root ◽  
Hordeum Vulgare L ◽  
Area And Volume

Previous papers have reported that relations between the total number, length, surface area, and volume of graminaceous root members tend to remain roughly constant during vegetative growth. Through the use of a model of the extension and branching of a seminal root of barley (Hordeum vulgare L.), which was developed for the purpose, an attempt has now been made to determine the properties of root growth responsible for the phenomenon.

ROOT DISTRIBUTION OF AND WATER UPTAKE BY FIELD-GROWN BARLEY IN A BLACK SOLOD

1988 ◽  
Vol 68 (2) ◽  
pp. 425-432 ◽  
Author(s):  
Y. K. SOON
Keyword(s):  
Hordeum Vulgare ◽  
Root Growth ◽  
Water Uptake ◽  
Root Length ◽  
Root Length Density ◽  
Spring Barley ◽  
Grain Filling ◽  
Soil Drought ◽  
Hordeum Vulgare L ◽  
Uptake Rates

A field study was conducted in 1984 and 1985 to determine the spatial distribution with time of root length density of spring barley (Hordeum vulgare L.) growing in a Black Solod in northwestern Alberta. The weakly solonetzic Bnt horizon present in the solodic soil appeared not to inhibit root growth, and roots were present to 90 cm depth of soil. Drought in 1985 reduced root growth in general, and in particular in the surface soil (0 – 15 cm depth) between crop rows. Root growth in both years continued well after ear emergence and attained a maximum total length (14.5 and 9.5 km m−2 in 1984 and 1985, respectively) some time into grain-filling. Water uptake rates of up to 1.3 cm3 m−1 d−1 were observed; this maximum rate was associated with younger roots in the 60- to 90-cm depth in 1984. Low availability of subsoil water in 1985, however, resulted in low root density and water uptake rates in the 60- to 90-cm depth. The weighted mean uptake rate for the entire root system was slightly more than 0.4 cm3 m−1 d−1 in 1984 and about half that in 1985. Key words: Barley, Hordeum vulgare L., solonetzic soil, water inflow, root growth, root length density

Effects of aluminum on the growth and distribution of calcium in roots of an aluminum-sensitive cultivar of barley (Hordeum vulgare)

1995 ◽  
Vol 73 (12) ◽  
pp. 1849-1858 ◽  
Author(s):  
B. E. Nichol ◽  
L. A. Oliveira
Keyword(s):  
Cell Division ◽  
Hordeum Vulgare ◽  
Root Growth ◽  
Cell Expansion ◽  
Cytosolic Calcium ◽  
Root Growth Inhibition ◽  
Hordeum Vulgare L ◽  
Calcium Indicator ◽  
Meristematic Region ◽  
Indicator Dyes

Aluminum-induced inhibition of root growth in the Al-sensitive cultivar Kearney of barley (Hordeum vulgare L.) is the result of disruption of both cell division in the meristematic region and cell expansion in the zone of elongation of the roots. In seedlings directly germinated in 50 μM Al, inhibition of root growth is detected 48 h after initiation of germination and it results primarily from the disruption of cell elongation. In seedlings germinated for 2 days under Al-free conditions, inhibition of root growth is apparent 8 h after transfer to 50 μM Al. In this instance, root growth inhibition is mainly the result of disruption of cell division in the meristematic region of the root. The calcium indicator dyes chlorotetracycline and Fluo-3 are used to study the distribution of intracellular calcium and its relationship to aluminum phototoxicity. Aluminum increases both chlorotetracycline and Fluo-3 fluorescence intensities. Fluorescence of the cytosolic calcium indicator dye Fluo-3 increases primarily in the zone of elongation of the roots of seedlings directly germinated in 50 μM aluminum. The increase in Fluo-3 fluorescence occurs concomitantly with major changes in both the length and width of the cells in the zone of elongation. The evidence suggests that changes in calcium homeostasis occurring in cells of the zone of elongation may be a major factor in the disruption of cell expansion and consequently root growth in seedlings directly germinated in 50 μM aluminum. Key words: aluminum, calcium, barley, chlorotetracycline, Fluo-3.

scholarly journals Relations Between the Dimensions of the Barley Root System: Effects of Mutilating the Root Axes

1971 ◽  
Vol 24 (4) ◽  
pp. 1057 ◽  
Author(s):  
C Hackett
Keyword(s):  
Root System ◽  
Surface Area ◽  
Vegetative Growth ◽  
Growth Period ◽  
Root Systems ◽  
Barley Root ◽  
Water Culture ◽  
Cereal Root ◽  
Area And Volume

A previous study indicated that intact cereal root systems develop in such a manner that relations between the total number, length, surface area, and volume of their members remain roughly constant during the vegetative growth period. To investigate this phenomenon further, barley plants were grown in water culture and were given one or other of the following treatments: root systems left intact, or root systems mutilated by removing the tip of each axis once it was 10-20 cm long. As expected, the intact and mutilated root systems developed markedly different patterns of branching. Surprisingly, however, the relations between root dimensions were almost identical in the two groups of plants. It is concluded that the extension and branching of cerea.l root systems are coordinated to an extent hitherto unappreciated. The implications of this discovery for the study of root systems are discussed.

Sign in / Sign up

Export Citation Format

Share Document