Geotropic Response of Coleoptiles under Anaerobic Conditions<sup>1</sup>

Wilkins, Malcolm B.; Shaw, Stanley M.

doi:10.1104/pp.42.8.1111

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…This might be attributable to a sensitivity of the curvature process to slightly anaerobic conditions. This is consistent with the previous work of Wilkins & Shaw (1967) who showed that shoot gravitropism occurred only in the presence of oxygen. Rufelt (1957) reported that 50% O2 caused enhanced curvatures of wheat roots after several hours.…”

Section: Effect Of Aerobic and Anaerobic Treatmentssupporting

confidence: 94%

Growth and gravitropism of corn roots in solution

Nantawisarakul

Newman

1992

Plant Cell & Environment

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Growth and early gravitropic responses of corn roots in solution have been studied using time-lapse photography. Aeration was required for both root growth and gravitropism. The optimum pH for gravitropism was in the range 5 to 6. The bending response seemed to be greater for roots in non-buffered solution than in buffered solution. Fastest growth and maximum curvature occurred with about 0-2 mol m"^ Ca^+. Under some conditions, the gravitropic response started with apparently negligible time delay after the start of the gravitropic stimulus. This may denote graviperception in or near the elongation zone itself. This mechanism for early but relatively weak gravitropism may help to explain a variety of gravitropic responses such as the 'early wrong way' curvature, and the behaviour of roots whose columella cells lack amyloplasts. More rapid bending appears to start at about 20 min, which is consistent with observations on roots in humid air and with the accepted statolith model of perception in the root cap.

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Section: Effect Of Aerobic and Anaerobic Treatmentssupporting

confidence: 94%

Growth and gravitropism of corn roots in solution

Nantawisarakul

Newman

1992

Plant Cell & Environment

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“…In maize roots, submergence suppressed the gravitropic curvature with a concomitant suppression of elongation growth (Nantawisarakul and Newman 1992), whereas only the curvature was inhibited by submergence in Allium roots (Moore and Evans 1986). Suppression of gravitropism under water was also reported in coleoptiles of oat and maize (Wilkins and Shaw 1967). In contrast, roots of wheat (Rufelt 1957), pea (Konings 1964), and cress (Haberkorn and Sievers 1977) showed gravitropic responses under conditions of submergence, although the pattern or the rate of curvature was somewhat modified.…”

Section: Introductionmentioning

confidence: 72%

“…Thus, the generality of suppression of gravitropic curvature by submergence has not always been confirmed. On the other hand, it has been proposed that anaerobiosis (Wilkins and Shaw 1967;Nantawisarakul and Newman 1992), removal of mucilage (Moore and Evans 1986), or leakage of growth substances, such as indole-3-acetic acid and abscisic acid (Pilet and Barlow 1987) may be associated with the modifications of gravitropism under conditions of submergence. In rice coleoptiles, submergence suppresses development of starchfilled amyloplasts, which appears to cause the delayed onset of gravitropic curvature in air (Kutschera et al 1990).…”

Section: Introductionmentioning

confidence: 98%

Suppression of gravitropic response of primary roots by submergence

Hoson

Kamisaka

1996

Planta

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Primary roots of six plant species were placed horizontally either in humid air or under water, and their growth and gravitropic responses were examined. In air, all the roots showed a normal gravitropic curvature. Under water without aeration, roots of rice (Oryza sativa L.), oat (Avena sativa L.), azuki bean (Vigna angularis Ohwi et Ohashi), and cress (Lepidium sativum L.) curved downward at almost same rate as in air, whereas the curvature of roots of maize (Zea mays L.) and pea (Pisum sativum L.) was strongly suppressed. Submergence did not cause a decrease in growth rate of these roots. When roots of maize and pea were placed horizontally under water without aeration and then rotated in three dimensions on a clinostat in air, they showed a significant curvature, suggesting that the step suppressed by submergence is not graviperception but the subsequent signal transmission or differential growth process. Constant bubbling of air through the water partly restored the gravitropic curvature of maize roots and completely restored that of pea roots. The curvature of pea roots was also partly restored by the addition of an inhibitor of ethylene biosynthesis, aminooxyacetic acid. In air, ethylene suppressed the gravitropic curvature of roots of maize and pea. Furthermore, the level of ethylene in the intercellular space of the roots was increased by submergence. These results suggest that the accumulation of ethylene in the tissue is at least partly involved in suppression of transmission of the gravity signal or of differential growth in maize and pea roots under conditions of submergence.

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