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Comparative effect of root-knot nematode on severity of Verticillium and Fusarium wilt in cotton
The effect of root-knot nematode (RKN) (Meloidogyne incognita) on Verticillium dahliae and Fusarium oxysporum f.sp. vasinfectum in cotton (Gossypium hirsutum) was investigated. Two different inoculation methods were used, one in which inoculum was added to the soil, so that nematode and fungal inoculum were in close proximity; the other, inoculation into the stem, whereby the two inocula were spatially separated. Invasion of the roots by RKN enhanced disease severity, as measured by the height of vascular browning in the stem, following inoculation with either wilt pathogen. The effect of RKN on Fusarium wilt was more pronounced than that on Verticillium wilt. Nematode-enhanced infection by F. oxysporum is a well known effect but there are few reports of enhanced infection by Verticillium due to RKN. Relative resistance of a number of cotton cultivars to both wilt diseases, as measured by height of vascular browning, was similar to the known field performance of the cultivars. The use of vascular browning as an estimate of disease severity was therefore validated
Enhancement of germination of spores ofVerticillium dahliae andFusarium oxysporum f.sp.vasinfectum in vascular fluid from cotton plants infected with the root-knot nematode
Grass pea
Grass pea (Lathyrus sativus L.) is a multipurpose robust grain legume crop with high nutritional value and a great potential for utilization in harsh environments. This robust crop is rightly considered as a model for sustainable agriculture. However, as a result of little breeding efforts when compared to other legume crops, grass pea potential has been underexploited. The growing interest in its use in Mediterranean-type environments, all over the world, is boosting a change. In this chapter, we review the presently available genetic resources, major breeding achievements and recent biotechnological approaches used in the improvement of grass pea, highlighting the necessary changes in grass pea research to provide a brighter future to this highly potential crop.Peer reviewe