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  • 1
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    Mutants of Arabidopsis thaliana with decreased amplitude in their phototropic response (1989)
    In:  Other Sources
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    Publication Date: 2019-08-16
    Description: Two mutants of Arabidopsis thaliana have been identified with decreased phototropism to 450-nanometer light. Fluence-response relationships for these strains (ZR8 and ZR19) to single and multiple flashes of light show thresholds, curve shapes, and fluence for maximum curvature in first positive' phototropism which are the same as those of the wild type. Similarly, there is no alteration from the wild type in the kinetics of curvature or in the optimum dark period separating sequential flashes in a multiple flash regimen. In addition, in both strains, gravitropism is decreased compared to the wild type by an amount which is comparable to the decrease in phototropism. Based on reciprocal backcrosses, it appears that the alteration is due to a recessive nuclear mutation. It is suggested that ZR8 and ZR19 represent alterations in some step analogous to an amplifier, downstream of the photoreceptor pigment, and common to both phototropism and gravitropism.
    Keywords: Life Sciences (General)
    Type: Plant physiology (ISSN 0032-0889); 91; 685-9
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A direct screening procedure for gravitropism mutants in Arabidopsis thaliana (L.) Heynh (1990)
    In:  Other Sources
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    Publication Date: 2019-08-17
    Description: In order to isolate gravitropism mutants of Arabidopsis thaliana (L.) Heynh. var Estland for the genetic dissection of the gravitropism pathway, a direct screening procedure has been developed in which mutants are selected on the basis of their gravitropic response. Variability in hypocotyl curvature was dependent on the germination time of each seed stock, resulting in the incorrect identification of several lines as gravitropism mutants when a standard protocol for the potentiation of germination was used. When the protocol was adjusted to allow for differences in germination time, these lines were eliminated from the collection. Out of the 60,000 M2 seedlings screened, 0.3 to 0.4% exhibited altered gravitropism. In approximately 40% of these mutant lines, only gravitropism by the root or the hypocotyl was altered, while the response of the other organ was unaffected. These data support the hypothesis that root and hypocotyl gravitropism are genetically separable.
    Keywords: Life Sciences (General)
    Type: Plant physiology (ISSN 0032-0889); 93; 525-31
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    NASA TECHNICAL REPORTS
  • 3
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    Influence of hook position on phototropic and gravitropic curvature by etiolated hypocotyls of Arabidopsis thaliana (1989)
    In:  Other Sources
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    Publication Date: 2019-08-15
    Description: Phototropic and gravitropic curvature by hypocotyls of Arabidopsis thaliana is minimal when the side of the hook with the cotyledons attached is positioned toward the direction of tropistic curvature, and maximal when that side of the hook is positioned away from the direction of tropistic curvature. Based on these data, it is proposed that the position of the hook with attached cotyledons affects curvature and not stimulus perception. A randomly oriented population of plants exhibited considerable heterogeneity in tropistic curvature. This heterogeneity arises at least in part from the dependence of curvature on the position of the hook.
    Keywords: Life Sciences (General)
    Type: Plant physiology (ISSN 0032-0889); 90; 376-9
    Format: text
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    NASA TECHNICAL REPORTS
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