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<p>The bird cherry oat aphid <i>Rhopalosiphum padi</i> L. is one of the most important insect-pest affecting wheat crops worldwide. The understanding of biochemical bases of aphid resistance in wheat and its progenitors may contribute to the development of new breeding strategies. Laboratory studies on changes in different defense enzymes and biochemical constituents were conducted on <i>Rhopalosiphum padi</i> infested and uninfested <i>Aegilops tauschii</i> accessions to understand the bases of aphid resistance. <i>Aegilops tauschii</i> accessions showed a 3.2 to 8.0-fold increase in phenylalanine ammonia-lyase (PAL) activity and a 1.5 to 1.98-fold increase in polyphenol oxidase (PPO) activity in <i>R. padi</i> infested plants. Increased phenolic production by PAL and oxidation of phenols into quinones by PPO were found to be the key defense mechanisms in <i>Ae tauschii</i> against <i>R. padi</i> infestation. However, the activity of superoxide dismutase and catalase, which are primary defense response to most insect pests, was suppressed&#xa0;after <i>R. padi</i> infestation in <i>Ae. tauschii</i> accessions. Accumulation of osmolytes viz<i>.,</i> proline and glycine betaine were also recorded in <i>Ae. tauschii</i> accessions in response to <i>R. padi</i> infestation. Increase in the total soluble protein and decrease in the free amino acids and total soluble sugars was also recorded in <i>R. padi</i> infested <i>Ae. tauschii</i> accessions. This metabolic shift indicated the redistribution of nutrients from primary metabolism to the enhanced production of&#xa0;defense-related proteins and amino acids and activation of phenylpropanoid pathway in <i>Ae tauschii</i> in response to&#xa0;<i>R. padi</i>&#xa0;infestation.</p>

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A comprehensive analysis of biochemical bases of bird cherry oat aphid Rhopalosiphum padi L. resistance in Aegilops tauschii Coss.

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Harpreet Singh,
  • Beant Singh,
  • Satvir Kaur Grewal,
  • Parveen Chhuneja

摘要

The bird cherry oat aphid Rhopalosiphum padi L. is one of the most important insect-pest affecting wheat crops worldwide. The understanding of biochemical bases of aphid resistance in wheat and its progenitors may contribute to the development of new breeding strategies. Laboratory studies on changes in different defense enzymes and biochemical constituents were conducted on Rhopalosiphum padi infested and uninfested Aegilops tauschii accessions to understand the bases of aphid resistance. Aegilops tauschii accessions showed a 3.2 to 8.0-fold increase in phenylalanine ammonia-lyase (PAL) activity and a 1.5 to 1.98-fold increase in polyphenol oxidase (PPO) activity in R. padi infested plants. Increased phenolic production by PAL and oxidation of phenols into quinones by PPO were found to be the key defense mechanisms in Ae tauschii against R. padi infestation. However, the activity of superoxide dismutase and catalase, which are primary defense response to most insect pests, was suppressed after R. padi infestation in Ae. tauschii accessions. Accumulation of osmolytes viz., proline and glycine betaine were also recorded in Ae. tauschii accessions in response to R. padi infestation. Increase in the total soluble protein and decrease in the free amino acids and total soluble sugars was also recorded in R. padi infested Ae. tauschii accessions. This metabolic shift indicated the redistribution of nutrients from primary metabolism to the enhanced production of defense-related proteins and amino acids and activation of phenylpropanoid pathway in Ae tauschii in response to R. padi infestation.