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Related Experiment Videos

Dap (Defective aleurone pigmentation) mutations affect maize aleurone development

G Gavazzi1, S Dolfini, D Allegra

  • 1Dipartimento di Fisiologia delle Piante coltivate e Chimica agraria, Università degli Studi di Milano, Italy. gavazzi@imiucca.csi.unimi.it

Molecular & General Genetics : MGG
|December 11, 1997
PubMed
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Defective aleurone pigmentation (Dap) mutations in maize cause a dappled endosperm. Some Dap mutations are lost during male transmission, potentially due to chromosomal deletions, while others may involve imprinting or dosage effects.

Area of Science:

  • Plant genetics
  • Maize endosperm development
  • Molecular genetics

Background:

  • Defective aleurone pigmentation (Dap) mutations in maize result in a distinctive dappled endosperm phenotype.
  • These mutations exhibit dominant expression when maternally inherited but are not expressed or transmitted paternally.
  • Homozygous Dap genotypes are not recovered, and Dap seeds are reduced in outcrosses of Dap/+ females, with associated seed size reduction.

Purpose of the Study:

  • To investigate the genetic basis and transmission patterns of Defective aleurone pigmentation (Dap) mutations in maize.
  • To differentiate between classes of Dap mutants based on their transmission characteristics.
  • To explore potential mechanisms underlying the observed endosperm phenotypes and associated cellular abnormalities.

Main Methods:

Related Experiment Videos

  • Genetic analysis of maize mutants exhibiting the dappled endosperm phenotype.
  • Segregation analysis in progeny of outcrosses involving Dap/+ individuals.
  • Hypothesis testing for chromosomal deletions linked to NMT (non-male-transmissible) mutations.

Main Results:

  • Dap mutants were classified into male-transmissible (MT) and non-male-transmissible (NMT) groups.
  • Genetic evidence supports the hypothesis that NMT mutations are linked to intercalary deletions, leading to selection against the deficient chromosome during male gametogenesis.
  • MT alleles may be explained by mechanisms such as imprinting or dosage effects.
  • Abnormal cell shape and blocked anthocyanin biosynthesis were observed in colorless areas of the endosperm.

Conclusions:

  • NMT mutations in maize are likely associated with chromosomal deletions, impacting their transmission through male gametes.
  • MT mutations may involve epigenetic factors like imprinting or gene dosage.
  • The connection between flavonoid precursors, cell shape, and the dappled endosperm phenotype warrants further investigation.