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United States Department of Agriculture

Agricultural Research Service

Title: Cotton Germplasm: Root-Knot Nematode Resistance in Day-Neutral Primitive Accessions

Authors
item McCarty, Jack
item Jenkins, Johnie
item Robinson, Michael - MISSISSIPPI STATE UNIV

Submitted to: Mississippi Agricultural and Forestry Experiment Station Research Report
Publication Type: Experiment Station
Publication Acceptance Date: April 2, 1998
Publication Date: N/A

Interpretive Summary: In order for germplasm to be fully utilized it must be evalauted for useful traits. The objective of this study was to screen seventy-nine day-neutral primitive accessions of cotton for southern root-knot nematode resistance. The root-knot nematode is a major pest of cotton in most production regions. The cotton lines were evaluated in a greenhouse test for egg-mass production after being grown for forty days in pots inoculated with nematode eggs. None of the lines produced as few egg-masses as our highly resistant check M315 RNR. Twenty-four lines had significantly fewer egg-masses than highly susceptible M8 an indication they carried an intermediate level of resistance. Germplasm evaluations, such as this, will aid its utilization in breeding programs.

Technical Abstract: Germplasm cannot be fully utilized until it is evaluated for useful traits. The objective of this study was to screen seventy-nine day-neutral primitive accessions of cotton, Gossypium hirsutum L., for resistance to the southern root-knot nematode, Meloidogyne incognita (Kofoid and White) Chitwood race 3. The southern root-knot nematode is a major pest of cotton. Cotton lines were evaluated in a greenhouse test for egg-mass production after being grown for forty days in pots inoculated with nematode eggs. None of the lines produced as few egg-masses as our highly resistant check M315 RNR. Twenty-four lines had significantly fewer egg-masses than highly susceptible M8, an indication they carried an intermediate level of resistance. Germplasm evaluations, such as this, will aid its utilization in breeding programs.

Last Modified: 11/27/2014
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