A Morphogenetic Study of Lanceolate, A Leaf-Shape Mutant in the Tomato

Mathan, D. S.; Jenkins, J. A.

doi:10.2307/2439421

Cited by 23 publications

(1 citation statement)

References 13 publications

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“…La leaves are simple, and homozygous La plants show severe SAM-maintenance defects (Mathan and Jenkins 1960;Mathan and Jenkins 1962). We recently identiWed the LA gene and showed that its precocious expression in La mutant leaves leads to early diVerentiation of the leaf marginal blastozone (Ori et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Meristem maintenance and compound-leaf patterning utilize common genetic mechanisms in tomato

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Shirding

Shleizer

et al. 2007

Planta

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Balancing shoot apical meristem (SAM) maintenance and organ formation from its flanks is essential for proper plant growth and development and for the flexibility of organ production in response to internal and external cues. Leaves are formed at the SAM flanks and display a wide variability in size and form. Tomato (Solanum lycopersicum) leaves are compound with lobed margins. We exploited 18 recessive tomato mutants, representing four distinct phenotypic classes and six complementation groups, to track the genetic mechanisms involved in meristem function and compound-leaf patterning in tomato. In goblet (gob) mutants, the SAM terminates following cotyledon production, but occasionally partially recovers and produces simple leaves. expelled shoot (exp) meristems terminate after the production of several leaves, and these leaves show a reduced level of compoundness. short pedicel (spd) mutants are bushy, with impaired meristem structure, compact inflorescences, short pedicels and less compound leaves. In multi drop (mud) mutants, the leaves are more compound and the SAM tends to divide into two active meristems after the production of a few leaves. The range of leaf-compoundness phenotypes observed in these mutants suggests that compound-leaf patterning involves an array of genetic factors, which act successively to elaborate leaf shape. Furthermore, the results indicate that similar mechanisms underlie SAM activity and compound-leaf patterning in tomato.

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Section: Discussionmentioning

confidence: 99%

Meristem maintenance and compound-leaf patterning utilize common genetic mechanisms in tomato

Brand

Shirding

Shleizer

et al. 2007

Planta

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Biochemistry of the Hydroxyprolines

Kuttan¹,

Radhakrishnan²

1973

Advances in Enzymology - And Related Areas of Molecular Biology

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Dosage Effects of the Lanceolate Gene in Tomato

Stettler

1964

American J of Botany

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In contrast to the odd‐pinnately compound leaf of the normal (+/+) tomato plant (Lycopersicon esculentum), the single‐gene mutant lanceolate (La/+) generally has a simple leaf. Lanceolate plants, also, have small fruits and flowers, weak apical dominance, and exhibit variation in the position and fusion of cotyledons. Homozygous mutants (La/La) appear in 3 different phenotypes, 1 of which, narrow, has narrow simple leaves, sterile inflorescences, and extremely weak apical dominance. The other 2, modified, and reduced, lack an organized shoot. After selfing La/ + plants for 9 generations, autotetraploids were produced with the aid of colchicine. In addition, several triploid plants arose spontaneously. The study of diploid, triploid, and tetraploid material with various proportions of the La allele revealed in many characters a graded series as a function of the La dosage. With increasing La dose, there was a gradual reduction in: (1) total leaf length; (2) the number and size of primary and secondary lateral leaflets; (3) the number and size of marginal lobes of the terminal leaflet, associated with an increase in the proportional length of the terminal leaflet. Many leaves were found with the basal lobes of the terminal leaflet resembling incompletely separated lateral leaflets. The differences in leaf shape between different genotypes came about before the leaf primordium was 3 mm long. There was a progressive delay in the initiation of lateral primordia with increasing La dosage. It is proposed that the gradual changes from compound to simple leaves with increasing La dosage are produced by successively greater restrictions of meristematic activity after the terminal leaflet is formed. With increasing proportion of La alleles, the reproductive structures showed: (1) a decrease in the number of flowers per inflorescence; (2) a decrease in the length of the sepals; (3) an increase in the proportion of flowers with dialytic anthers. Dialytic anthers had narrow adaxial lobes and were frequently twisted along their main axes. The common denominator for most trends affected by the La allele seems to be a general reduction of growth, but more so in lateral than in longitudinal growth. Histological data suggest that the reduction in lateral growth is mainly brought about by a reduction of cell division in lateral meristems.

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A Morphogenetic Study of Lanceolate, A Leaf-Shape Mutant in the Tomato

Cited by 23 publications

References 13 publications

Meristem maintenance and compound-leaf patterning utilize common genetic mechanisms in tomato

Meristem maintenance and compound-leaf patterning utilize common genetic mechanisms in tomato

Biochemistry of the Hydroxyprolines

Dosage Effects of the Lanceolate Gene in Tomato

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