On the Orbital Spacing Pattern of Kepler Multiple-planet Systems

Arabidopsis trichomes are single-celled epidermal hairs that serve as a useful model for the study of plant cell differentiation. An examination of the distribution of trichomes early in their development revealed that developing trichomes occur adjacent to another trichome much less frequently than would be expected by chance. Clonal analysis of epidermal cell lineages ruled out a role for cell lineage in generating the observed minimum-distance spacing pattern. Taken together, these results are consistent with a role for lateral inhibition in the control of trichome development. We also report the identification of a new locus, Reduced Trichome Number (RTN), which affects the initiation of trichomes. This locus was initially detected by the reduced number of leaf trichomes on Landsberg erecta plants compared to that on Columbia plants. Quantitative Trait Locus mapping revealed that more than 73% of the variation in trichome number was due to a major locus near erecta on chromosome 2. The reduced number of trichomes conditioned by the Landsberg erecta allele of this locus appeared to be due to an early cessation of trichome initiation. The implications of these observations are discussed with regard to previously published models of trichome development.

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Influences of remnant size, spacing pattern and connectivity on population boundaries and demography in euros Macropus robustus living in a fragmented landscape

Biological Conservation ◽

10.1016/0006-3207(93)90323-s ◽

1993 ◽

Vol 64 (3) ◽

pp. 219-230 ◽

Cited By ~ 32

Author(s):

G.W. Arnold ◽

D.E. Steven ◽

J.R. Weeldenburg ◽

E.A. Smith

Keyword(s):

Fragmented Landscape ◽

Spacing Pattern

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Spacing pattern in a social group of stray cats: effects on male reproductive success

Animal Behaviour ◽

10.1016/s0003-3472(04)00098-3 ◽

2004 ◽

Author(s):

L SAY

Keyword(s):

Reproductive Success ◽

Social Group ◽

Male Reproductive Success ◽

Spacing Pattern ◽

Stray Cats

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Spacing pattern in a social group of stray cats: effects on male reproductive success

Animal Behaviour ◽

10.1016/j.anbehav.2003.11.008 ◽

2004 ◽

Vol 68 (1) ◽

pp. 175-180 ◽

Cited By ~ 23

Author(s):

Ludovic Say ◽

Dominique Pontier

Keyword(s):

Reproductive Success ◽

Social Group ◽

Male Reproductive Success ◽

Spacing Pattern ◽

Stray Cats

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Pattern Area and Discrimination Learning with Pattern Spacing, Pattern Height, Pattern-Border Contiguity, and Pattern Manipulation Controlled

Perceptual and Motor Skills ◽

10.2466/pms.1969.29.2.407 ◽

1969 ◽

Vol 29 (2) ◽

pp. 407-413 ◽

Cited By ~ 3

Author(s):

Merrill F. Elias

Keyword(s):

Discrimination Learning ◽

Pattern Discrimination ◽

Spacing Pattern ◽

Temporal Succession ◽

Improved Learning ◽

The Relationship ◽

Dark Room

The relationship between pattern area and pattern discrimination learning was explored. The possibly confounding effects of pattern spacing, height, contiguity, and manipulation were removed or controlled by: (a) presenting illuminated .25-, 1-, and 4-sq. in. patterns in a totally dark room, (b) alternating correct and incorrect patterns in a randomly determined temporal succession, (c) equating pattern height for all pattern-area conditions, (d) prohibiting pattern manipulation. Increasing pattern height from 1 to 4 sq. in. still resulted in improved learning. Results were interpreted in terms of utilization of brightness and/or size differences as cues to pattern discrimination.

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