Indian Society of Genetics & Plant Breeding

Inheritance of two types of modified leaf venation in sunflower (Helianthus annuus L.)

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The inheritance of two types of modified leaf venation which
were called as fan-nerved venation was studied in the
cultivated sunflower. Both types of modified venation were
isolated in chemical mutagenesis experiments which were
conducted earlier. A distinctive feature of one of the
mutations is clear appearance of central rib while the second
mutation lacks it.The F1 plants from crosses between those
mutants and between the mutants and genotypes with
reticulate leaf venation had the usual reticulate leaf venation
of sunflower (the wild type). The test of allelism, thus,
demonstrates that the venation in the induced mutations
is controlled by a gene (or genes) different from the
gene causing the other venation phenotype. The F2
segregated into four phenotypic classes of leaf venation:
reticulate, two groups of both types of modified venation,
and plants with the two modified venation types
combined in the ratio of 9 reticulate (double dominant
phenotype) : 3 fan-venation type 1 : fan-venation type 2 : 1
combined fan-venation (double recessive homozygotes).
It is concluded that two non-allelic recessive genes with
complementary interaction are involved in the genetic
control of fan-nerved leaf venation, and reticulate venation
was determined by a combination of at least two
dominant alleles of these genes. The gene symbols
proposed are vf1 and vf2.

Keywords: Sunflower, leaf venation, inheritance, twogene control


Year: 2015
Volume: 75
Issue: 1
Article DOI: 10.5958/0975-6906.2015.00009.7
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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