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Crop Science Abstract -

Generation Mean Analyses of Various Allelochemics in Cottons1

 

This article in CS

  1. Vol. 22 No. 5, p. 1046-1049
     
    Received: Jan 5, 1982


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doi:10.2135/cropsci1982.0011183X002200050036x
  1. W. H. White,
  2. J. N. Jenkins,
  3. W. L. Parrott,
  4. J. C. McCarty Jr.2,
  5. D. H. Collum and
  6. P. A. Hedin3

Abstract

Abstract

Several secondary plant metabolites are alleged to confer resistance of cotton, Gossypium hirsutum L., to various insects and mites. At the present time, only the inheritance of the sesquiterpenoid gossypol has been elucidated. This research was conducted to determine inheritance of several inferred/hypothesised allelochemics from cotton, in particular those alleged to confer resistance to the tobacco budworm, Heliothis virescens (F.).

Generation mean analysis (GMA) was used as the genetic design. The following GMA's were evaluated: ‘DES-24’ × ‘SATU-65’, DES-24 × ‘BJA-592’, and DES-24 × MOHG. The six populations (P1, P2, F1, F2, BCP1, and BCP2) comprising a GMA were planted as a randomized complete block with four rcplicatlons. Analyses of young cotton leaves for condensed tannins, catechln, total phenols, E1.1, aniline reacting terpenes, and phloroglucinol reactive compounds were obtained at intervals during the growing season. Analysis of variance was conducted on seasonal means.

The inheritance of gossypol, as measured by the GHEA extract of the phloroglucinol test, was predominately additive. Gossypol, as detected by the aniline reacting terpene test, was shown to be inherited by predominately dominant gene action. The genetic analysis indicates that the GHEA and aniline reacting terpene tests are measuring gene products which are inherited in different manners. The four tests used for the determination of condensed tannins also appeared to be measuring somewhat diverse genetic products. This was apparent because E1.1 and fresh disc assay tannins, but not tannin and catechin tannins, showed significant variation among populations in the DES-24 × SATU-65. E1.1 and catechin tannins, but not the tannin and fresh disc assay tannins, showed significant variation among populations in the DES-24 × BJA-592 cross. When condensed tannins as measured by any of these tests were genetically analyzed in a cross, inheritance was highly additive.

The high degree of additive gene action for condensed tannins, a flavonoid-anthocyanin mixture, gossypol by the CHEA test, and total phenolics indicate that it should be possible to fix and select for increased levels of these compounds.

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