HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (5) Citing Articles via Google Scholar Google Scholar Articles by Zhang, J. Articles by Cantrell, R. G. Search for Related Content PubMed Articles by Zhang, J. Articles by Cantrell, R. G. Agricola Articles by Zhang, J. Articles by Cantrell, R. G.

CROP BREEDING & GENETICS

Relationships between Root-Knot Nematode Resistance and Plant Growth in Upland Cotton

Galling Index as a Criterion

^a Dep. of Plant and Environ. Sci., Box 30003, New Mexico State University, Las Cruces, NM 88003
^b Cotton Incorporated, Cary, NC 27513 USA

^* Corresponding author (jinzhang{at}nmsu.edu)

The southern root-knot nematode (RKN) [Meloidogyne incognita (Kofoid and White) Chitwood] is one of the most destructive pests in the Cotton Belt of the USA. The lack of an economical evaluation method for RKN resistance has hindered the development of resistant cultivars. This investigation was conducted to develop an improved RKN evaluation technique. Twelve genotypes including seven susceptible (S) lines, one moderately resistant (MR) line, three highly resistant (R) lines derived from ‘Auburn 623 RNR,’ and one F₁ between DP 33B (S) and ‘Auburn 634 RNR’ (R) were evaluated in the greenhouse for plant growth, RKN egg reproduction, and root galling in Experiment 1. RKN egg reproduction was highly and positively correlated with galling index and both were highly and negatively correlated with plant growth characteristics including plant height, number of leaves, plant and root weight. Galling index was confirmed to be highly significantly and negatively correlated with plant height and fresh weight in Experiment 2 with 9 parents and their 36 F₁ hybrids. Galling index had highest genotypic F value and comparable coefficient of variance (CV) to the plant characteristics, while CV for egg counts was very high. Correlation between the two greenhouse tests in the 9 parental lines as measured by galling index was highly significant. Comparison between F₁ and their parents in egg reproduction and galling revealed that the RKN resistance is partially dominant. Using a common check and double inoculation in each pot, galling index is an easy, quick and reliable method for screening large numbers of cotton plants.

Abbreviations: ANOVA, analysis of variance • BG, Bollgard • CV, coefficient of variation • LSD, least significant difference • RKN, root knot nematode

This article has been cited by other articles:

				C. Niu, D. J. Hinchliffe, R. G. Cantrell, C. Wang, P. A. Roberts, and J. Zhang Identification of Molecular Markers Associated with Root-Knot Nematode Resistance in Upland Cotton Crop Sci., May 31, 2007; 47(3): 951 - 960. [Abstract] [Full Text] [PDF]

				D. B. Weaver, K. S. Lawrence, and E. van Santen Reniform Nematode Resistance in Upland Cotton Germplasm Crop Sci., January 22, 2007; 47(1): 19 - 24. [Abstract] [Full Text] [PDF]