Life cycle and pathogenicity of root-knot nematode, meloidogyne graminicola (Golden and birchfield) on rice
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Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
Investigations were carried out on life cycle and pathogenicity of Meloidogyne graminicola on
scented and non-scented rice varieties under screen house conditions. In life cycle and development
experiment, life cycle of M. graminicola was studied on var. Pusa 1121 and. PR 114. The j
2 of M.
graminicola penetrated into rice roots after 24 h in scented rice while in non-scented rice in 72 h. The
third stage (j3
) appeared on 7 DAI in scented rice as compared to non-scented rice in 9 DAI. Young
females were first noticed on 11 DAI and 15 DAI for scented and non-scented rice, respectively.
Further, egg deposition started as 19 DAI and 23 DAI inside the roots in scented and non-scented rice,
respectively. Nematode completed its life cycle in 21 days in scented rice and 25 days in non-scented
rice. The experiment on pathogenicity of M. graminicola was carried out in three different types of soil
(clay loam, sandy loam and loamy sand) by using different inoculum levels such as 0 (non-inoculated
check), 10, 100, 1000 and 10000 j
2
/kg soil. The results revealed that growth of both varieties of rice
(scented and non-scented) was significantly improved in clay loam soil followed by sandy loam and
loamy sand irrespective of inoculum levels. In case of inoculum levels, maximum plant growth was
observed in non-inoculated check which was statistically at par with 10 j2. Plant growth parameters
were decreased significantly as inoculum levels increased from 10-10000 j
2 irrespective of soil types.
Significant reduction in growth parameters was observed from inoculum level of 100 j
2/kg soil
onwards. Observations on nematode reproduction and multiplication revealed that maximum and
significant reduction in number of galls, number of eggs per plant and final nematode population was
observed in clay loam followed by sandy loam and loamy sand irrespective of inoculum levels.
Nematode multiplication and reproduction was increased as inoculum levels increased from 10-1000 j
2
but decreased abruptly at 10000 j
2
. Maximum and significantly highest multiplication and reproduction
was observed in 1000 j2 of M. graminicola. Nematode growth parameters at 100 j2
were significantly
different from non-inoculated check and other inoculum levels which can be termed as pathogenic level
of M. graminicola on rice.
Description
Keywords
Rice, Biological phenomena, Vegetative propagation, Planting, Biological development, Application methods, Clay, Sand, Eggs, Meloidogyne graminicola