Defense response induced by silicon amendment against Scirpophaga incertulas (Walker) and Cnaphalocrocis medinalis (Guenee) infestation in rice

ORYZA- An International Journal on Rice Pub Date : 2022-09-30 DOI:10.35709/ory.2022.59.3.9

S. Panda, L. Rath, S. Panda, G. Rout, R. Swain

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Abstract

Considering silicon (Si) amendment as an eco-holistic approach in insect pest management, an attempt was made to optimize the dose of diatomaceous earth (DAE), an organic silicate fertilizer and study the mechanism of resistance against stem borer and leaf folder infesting rice. Basal application of this product at 50-500 kg ha-1 effectively restricted damage by both the insects in rice cv.TN1 and increased the crop yield by 22-80% over control as against 74% increase in standard check, calcium silicate applied at 2000 kg ha-1. An enhancement of plant resistance to these pests was conspicuously observed at different doses of DAE. The best performance was exhibited at 300 kg ha-1 with a record average of 9.46% dead heart and 3.26% white ears due to stem borer and 1.84% leaf damage by leaf folder compared to corresponding damage of 22.34, 19.40 and 3.33%, respectively in untreated control. This induction of plant resistance was attributed to higher silicon deposit supported by marked impact of feeding stimuli from stem borer in altering the chlorophyll, phenol and protein contents of the rice plant.

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硅改性诱导水稻对稻纵棘蝗和稻纵棘蝗侵染的防御反应

将硅(Si)改良作为一种生态综合治理害虫的方法，尝试优化有机硅酸盐肥料硅藻土(DAE)的用量，研究水稻对螟虫和叶折虫的抗性机理。本品基施50 ~ 500 kg hm -1，可有效抑制这两种害虫对水稻的危害。施用2000 kg hm -1硅酸钙可使作物产量比对照提高22-80%，而在标准对照中增产74%。不同剂量的DAE显著增强了植物对这些害虫的抗性。在300 kg hm -1处理时表现最佳，茎螟虫致死率为9.46%，白穗率为3.26%，叶夹害率为1.84%，而未处理的相应害率分别为22.34%、19.40%和3.33%。这种抗性的诱导归因于较高的硅沉积，以及茎螟虫取食刺激对水稻植株叶绿素、酚和蛋白质含量的显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ORYZA- An International Journal on Rice

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