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<p>There is a great variation in grain Zn content among the rice genotypes. This study investigated the changes in endophytic bacterial population and Zn content in various plant tissues during plant growth stages in the rice genotypes Karuppunel, CO51, and ADT39 which differ in their grain Zn accumulation trait with response to applied Zn. The wild type, Karuppunel exhibited a higher population of endophytic bacteria compared to CO51 and ADT39, during all growth stages. Application of ZnSO<sub>4</sub> enhanced the bacterial density in all genotypes. The EBPs increased until the panicle initiation stage and declined during grain-filling; following in tissues the trend of root &gt; steam &gt; leaf &gt; spike was recorded in all tissues. Karuppunel including spike Zn levels consistently enhanced compared to CO51 and ADT39. Zn accumulation pattern of CO51 was similar to Karuppunel under +Zn conditions; but under -Zn situation insignificant increase in spike Zn content between PI and GF stages was recorded. In ADT39, Zn accumulation in tissues of leaf, stem, root, steadily increased during the plant growth; however, in spike insignificant increase in amount of Zn was noted in both +Zn and -Zn condition. Karuppunel had the highest mean grain Zn values across seed characteristics under +Zn and -Zn conditions, followed by CO51 and ADT39. The study identified specific endophytic bacterial types through 16S rRNA sequencing in rice genotypes and tissue-specific distribution was understood during different stages of plant growth. The presence of <i>Bacillus altitudinus</i> was observed as a specific bacterial type to Karuppunel. The close presence of their members was noted in all tissues of Karuppunel when the plant grew. <i>Bacillus endophyticus</i> was found in all tissues of Karuppunel; but restricted to root in CO51 and to leaf tissues in ADT39 during various growth stages. This study provides valuable insights into variation in endophytic bacterial types and pattern of Zn accumulation in various tissues during growth stages among rice genotypes. These findings may also contribute to our efforts to unravel plant-microbe partnership in nutrient accumulation especially Zn accumulation in grains during rice cultivation of different rice genotypes.</p>

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Culturable endophytic bacteria associated with zinc accumulation difference in rice genotypes

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Yama Santhoshi Lavanya,
  • Dhandapani Murugesan,
  • K. Sudheer,
  • Manoj Kumar Samala,
  • Kenas Vijila

摘要

There is a great variation in grain Zn content among the rice genotypes. This study investigated the changes in endophytic bacterial population and Zn content in various plant tissues during plant growth stages in the rice genotypes Karuppunel, CO51, and ADT39 which differ in their grain Zn accumulation trait with response to applied Zn. The wild type, Karuppunel exhibited a higher population of endophytic bacteria compared to CO51 and ADT39, during all growth stages. Application of ZnSO4 enhanced the bacterial density in all genotypes. The EBPs increased until the panicle initiation stage and declined during grain-filling; following in tissues the trend of root > steam > leaf > spike was recorded in all tissues. Karuppunel including spike Zn levels consistently enhanced compared to CO51 and ADT39. Zn accumulation pattern of CO51 was similar to Karuppunel under +Zn conditions; but under -Zn situation insignificant increase in spike Zn content between PI and GF stages was recorded. In ADT39, Zn accumulation in tissues of leaf, stem, root, steadily increased during the plant growth; however, in spike insignificant increase in amount of Zn was noted in both +Zn and -Zn condition. Karuppunel had the highest mean grain Zn values across seed characteristics under +Zn and -Zn conditions, followed by CO51 and ADT39. The study identified specific endophytic bacterial types through 16S rRNA sequencing in rice genotypes and tissue-specific distribution was understood during different stages of plant growth. The presence of Bacillus altitudinus was observed as a specific bacterial type to Karuppunel. The close presence of their members was noted in all tissues of Karuppunel when the plant grew. Bacillus endophyticus was found in all tissues of Karuppunel; but restricted to root in CO51 and to leaf tissues in ADT39 during various growth stages. This study provides valuable insights into variation in endophytic bacterial types and pattern of Zn accumulation in various tissues during growth stages among rice genotypes. These findings may also contribute to our efforts to unravel plant-microbe partnership in nutrient accumulation especially Zn accumulation in grains during rice cultivation of different rice genotypes.