Effects of Soil Textures on Infectivity of Root-Knot Nematodes on Carrot.
This study was conducted to examine infectivity (penetration and gall and egg-mass formations) of the root-knot nematodes,Meloidogyne incognitaandM. hapla, on carrots grown in soil conditions of 5 different soil textures consisting of bed-soil (b) and sand (s) mixtures (b-s mixtures) at the ratios of 10:0, 7:3, 5:5, 3:7, and 0:10. ForM. incognita, the nematode penetration rates in b-s of 0:10 (100% sand) were significantly higher than in the other b-s mixtures, more greatly at 2 and 5 days after inoculation than at 10 DAI, while no significant differences in the penetration rates were mostly shown forM. haplaat the above DAI. However, for both nematodes, gall and egg-mass formations were remarkably increased in the b-s mixture of 0:10, compared to the other b-s mixtures, which is coincided with the general aspects of severe nematode infestations in sandy soils. This suggests the increased gall and egg-mass formations ofM. incognitashould be derived from the increased penetration rates in the sandy soil conditions, which provide a sufficient aeration due to coarse soil nature for the nematodes, leading to their mobility increased for the enhanced root penetration. ForM. hapla, it is suggested that the sandy soil conditions affect positively on the healthy plant growth with little accumulation of the inhibitory materials and sufficient aeration, enhancing the nematode growth and feeding activities. All of these aspects provide information reliable for the development screening techniques efficient for the evaluation of the nematode resistance in the breeding programs.
Deaprtment of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea.
Eunji
E
Kim
Deaprtment of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea.
Yunhee
Y
Seo
KC Carrot Breeding Institute Co., Ltd., Daegu 42107, Korea.
Yong Su
YS
Kim
KC Carrot Breeding Institute Co., Ltd., Daegu 42107, Korea.
Yong
Y
Park
Deaprtment of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea.
Young Ho
YH
Kim
carrot; egg-mass; nematode penetration; root-knot galls; soil texture