Reaction of different Oryza species against rice root-knot nematode, Meloidogyne graminicola

J. Berliner, SS Pokhare, K. S. Meena, B. Manimaran, S. Munda, T. Adak, L. Bose, B. Patra
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Abstract

Rice (Oryza sativa) is an important cereal crop and staple food for more than half of the world population. The sedentary endoparasitic nematode Meloidogyne graminicola is one of the major biotic stress factors that limit rice production globally irrespective of the agro-ecosystem. To tackle this, the host plant resistance is given prime importance due to global awareness towards ecologically stable and environmentally safe management options. However, the availability of resistant source within O. sativa against M. graminicola is limited and hence the search was extended to its wild relatives globally. In line with that, about 24 germplasms of different Oryza species collected from the gene bank of NRRI, Cuttack were evaluated against M. graminicola under artificial inoculation condition. Among them O. eichingeri and O. grandiglumis belonging to O. officinalis species complex and O. brachyantha were found to be resistant to M. graminicola with the lowest gall index (2.0-2.3 galls /root system). Oyza rufipogon, O. officinalis and O. alta were found tolerant to the nematode while all other species exhibited susceptible to highly susceptible reaction to the nematode. A more comprehensive study is necessary to shed light on the consistency of resistance within each Oryza species and also suggest the utilization of molecular tools to decipher the resistance mechanism govern in the reported accessions against rice root-knot nematode.
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不同稻种对水稻根结线虫的防治作用
水稻(Oryza sativa)是一种重要的谷类作物,是世界上一半以上人口的主食。不论农业生态系统如何,定居型内寄生线虫是限制全球水稻生产的主要生物胁迫因子之一。为了解决这个问题,由于全球对生态稳定和环境安全管理选择的认识,寄主植物的抗性被赋予了首要的重要性。然而,在玉米中可获得的抗稻瘟病源是有限的,因此将搜索范围扩大到其全球野生近缘种。在人工接种条件下,对从NRRI、Cuttack基因库中收集的24份不同稻种的种质进行了抗稻瘟病的鉴定。其中,隶属于officinalis复合种的O. eichingeri和O. grandiglumis和O. brachyantha对禾草病菌的抗性最低,胆指数为2.0 ~ 2.3个/根。对线虫有耐受性的品种有褐皮虫、officinalis和alta,而对线虫有高度敏感反应的品种有易感。为了进一步阐明不同水稻品种间对根结线虫的抗性的一致性,并建议利用分子工具来解释已报道的材料对根结线虫的抗性机制,有必要进行更全面的研究。
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