Physiological Effects of Meloidogyne incognita Infection on Cotton Genotypes with Differing Levels of Resistance in the Greenhouse

被引:0
|
作者
Lu, Ping [1 ]
Davis, Richard F. [2 ]
Kemerait, Robert C. [1 ]
van Iersel, Marc W. [3 ]
Scherm, Harald [4 ]
机构
[1] Univ Georgia, Dept Plant Pathol, Tifton, GA 31793 USA
[2] USDA ARS, Crop Protect & Management Res Unit, Tifton, GA 31793 USA
[3] Univ Georgia, Dept Hort, Athens, GA 30602 USA
[4] Univ Georgia, Dept Plant Pathol, Athens, GA 30602 USA
关键词
chlorophyll; cotton; Gossypium hirsutum; height-to-node ratio; host-parasitic relationship; Meloidogyne incognita; photosynthesis; physiological stress; southern root-knot nematode; PHOTOSYNTHESIS; NEMATODES; STRESS; GROWTH;
D O I
暂无
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Greenhouse tests were conducted to evaluate (i) the effect of Meloidogyne incognita infection in cotton on plant growth and physiology including the height-to-node ratio, chlorophyll content, dark-adapted quantum yield of photosystem II, and leaf area; and (ii) the extent to which moderate or high levels of resistance to M. incognita influenced these effects. Cultivars FiberMax 960 BR (susceptible to M. incognita) and Stoneville 5599 BR (moderately resistant) were tested together in three trials, and PD94042 (germplasm, susceptible) and 120R1B1 (breeding line genetically similar to PD94042, but highly resistant) were paired in two additional trials. Inoculation with M. incognita generally resulted in increases in root gall ratings and egg counts per gram of root compared with the noninoculated control, as well as reductions in plant dry weight, root weight, leaf area, boll number, and boll dry weight, thereby confirming that growth of our greenhouse-grown plants was reduced in the same ways that would be expected in field-grown plants. In all trials, M. incognita caused reductions in height-to-node ratios. Nematode infection consistently reduced the area under the height-to-node ratio curves for all genotypes, and these reductions were similar for resistant and susceptible genotypes (no significant genotype 3 inoculation interaction). Our study is the first to show that infection by M. incognita is associated with reduced chlorophyll content in cotton leaves, and the reduction in the resistant genotypes was similar to that in the susceptible genotypes (no interaction). The susceptible PD94042 tended to have increased leaf temperature compared with the genetically similar but highly resistant 120R1B1 (P < 0.08), likely attributable to increased water stress associated with M. incognita infection.
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页码:352 / 359
页数:8
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