Effects of Soil Temperature and Light Intensity on Root Growth of Loblolly Pine Seedlings

Barney, Charles Wesley

doi:10.1104/pp.26.1.146

Cited by 59 publications

(23 citation statements)

References 17 publications

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“…Continual root growth is necessary to bring the absorbing regions of roots into contact with soil water in the undepleted portion of the soil. 2. Decrease in rate of movement of water from soil to roots.…”

Section: Methodsmentioning

confidence: 99%

A Comparative Study of Gradual and Abrupt Changes in Root Temperature on Water Absorption

Böhning

Lusanandana

1952

Plant Physiol.

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IntroductionThe effects of low root temperature on various plant processes have long been known and extensively studied. It is generally recognized that one of its important effects is the reduction in water absorption of the plant; and the nearer the root temperature approaches the freezing point of water, the greater this effect will be manifested. The change in physical state, particularly the increase in viscosity with the decrease in temperature, of both water and protoplasm are undoubtedly two basic factors influencing water absorption at low root temperatures. The reduction in water absorption will affect other plant processes, directly or indirectly, to a greater or smaller degree depending on the extent of water shortage within the plant, and consequently may result in corresponding injury to the plant. Conditions favorable to high transpiration have been reported to bring about wilting and injury to the plant from desiccation when its roots are subjected to low temperature. However, different plant species appear to differ in their capacity to withstand the effects of low root temperature. KRAMER (7) observed that species which grow in the winter and species native to cooler climates are less affected by low soil temperature than warm-weather species. The statement by KRAMER (7), which will be discussed later, that plants cooled slowly wilted less severely than plants cooled rapidly, seems to be the only report in the literature on the comparative effects of rates of lowering root temperature. Under natural conditions, the change in temperature varies not only in respect to the level to which the temperature falls but also in the rate at which it occurs. Information regarding the effects of different rates of temperature decrease seems at the present to be limited, and it was the purpose of this investigation to compare the effect on water absorption of an abrupt decrease in root temperature with a gradual decrease in root temperature.

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Section: Methodsmentioning

confidence: 99%

A Comparative Study of Gradual and Abrupt Changes in Root Temperature on Water Absorption

Böhning

Lusanandana

1952

Plant Physiol.

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“…However, in one case the reduction was only temporary and was followed by an increased rate of elongation after the plants had been at a low irradiance for more than 7 d (Richardson, 1953). There is an indication that branching of roots of Pinus taeda may also be reduced at low irradiance (Barney, 1951) but quantitative data are scanty.…”

Section: Introductionmentioning

confidence: 99%

EFFECTS OF PHOTON IRRADIANCE ON THE GROWTH OF SHOOTS AND ROOTS, ON THE RATE OF INITIATION OF MYCORRHIZAL INFECTION AND ON THE GROWTH OF INFECTION UNITS IN TRIFOLIUM SUBTERRANEUM L.

Tester¹,

Smith²,

Smith³

et al. 1986

New Phytologist

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SUMMARYThe effects of photon irradiance on the growth of young plants (up to three weeks old) of Trifolium subterraneum L. and on the development of mycorrhizal root systems were studied with plants grown in a soil/sand mixture inoculated with Glomus mosseae (Nicol. & Gerd.) Gerdemann & Trappe. Total plant growth was lower when phototi irradiance was 100 //mol m~'^ s~', compared with 450 /nnol m"^ s"'. Fresh weight of shoots was unaffected, but the fresh weight/dry weight ratio was increased at the lower irradiance in shoots, but not in roots. The main effect of decreased irradiance on the growth of the root system was a reduction in the numbers of first-and second-order lateral roots initiated. The average rate of extension of axial and lateral roots was only slightly reduced. The fraction of the root length infected was lower at the lower irradiance, particularly in the first two weeks. Development of infection was analyzed in terms of the role of formation of mycorrhizal entry-points (A) and the average rate of growth of infection units {B). Reduction in the fraction of the root length infected was found to be due to a reductioti in A. B was remarkably constant at the two irradiances and in the different root subsystems. Thus both roots atid infection units respond by makitig fewer units of unaltered rate of growth.

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“…Previous workers who bave observed roots through the sides of tubes (e.g. Barney, 1951;Bilan, 1964) have measured the growth of individual roots. However, this could give an incorrect estimate of the influence of soil moisture on total root production, if soil moisture influences branching as well as increase in length.…”

Section: E-^-newmanmentioning

confidence: 99%

RELATIONSHIP BETWEEN ROOT GROWTH OF FLAX (LINUM USITATISSIMUM) AND SOIL WATER POTENTIAL

Newman

1966

New Phytologist

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SUMMARYFlax plants were grown in vertical cylinders of soil contained in polyethylene tubing. Root growth was estimated from the number of roots crossing vertical and horizontal lines on the tube surface. After the plants were 29 days old, some of the soil cylinders received no more water, and root growth and soil water content in each 10 cm layer of soil were determined at 2-day intervals. When a graph of root growth against soil water potential is plotted, points from each 10 cm layer fall approximately on the same concave curve. A marked reduction in root growth first occurred at -7 bars total water potential. At -15 bars, root growth was 20°/ or less of the rate before drying, but some root growth occurred in soil drier than -20 bars. The results suggest that root growth in each layer was not influenced by water potential elsewhere in the plant.

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Effects of Soil Temperature and Light Intensity on Root Growth of Loblolly Pine Seedlings

Cited by 59 publications

References 17 publications

A Comparative Study of Gradual and Abrupt Changes in Root Temperature on Water Absorption

A Comparative Study of Gradual and Abrupt Changes in Root Temperature on Water Absorption

EFFECTS OF PHOTON IRRADIANCE ON THE GROWTH OF SHOOTS AND ROOTS, ON THE RATE OF INITIATION OF MYCORRHIZAL INFECTION AND ON THE GROWTH OF INFECTION UNITS IN TRIFOLIUM SUBTERRANEUM L.

RELATIONSHIP BETWEEN ROOT GROWTH OF FLAX (LINUM USITATISSIMUM) AND SOIL WATER POTENTIAL

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