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<p>The objective of the present study was to assess morpho-physiological and biochemical changes in rice genotypes under Fe + Al exposure to identify Fe + Al tolerant and sensitive groups. Twenty-eight rice genotypes were grown for 60&#xa0;days (V5 vegetative stage; rice seedling containing five fully-expanded leaves), and subsequently treated two times with 0 (control) and 50&#xa0;mM FeSO<sub>4</sub> + 10&#xa0;mM Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> (Fe + Al treatment) at 45&#xa0;days (V3 vegetative stage; rice seedling containing three fully-expanded leaves) and 52&#xa0;days (V4 vegetative stage; rice seedling containing four fully-expanded leaves). The Fe + Al treatment was renewed once a week. Fe content in the root and shoot tissues, and Al content in shoot tissues were increased in all rice genotypes when subjected to the Fe + Al treatment. In contrast, Al content remained unchanged in the root tissues of RuangDeaw, LuengKwaiLa, 716-54R, NeawHom, LuengHom, KaiModRhin3, NaKwan, and LuengThong genotypes when subjected to the Fe + Al treatment. Fe and Al contents in the leaf tissues were significantly increased, leading to a decrease in leaf greenness (&gt; 15% over the control), diminution of photon yield of photosystem II (&gt; 20% over the control), and reducing net photosynthetic rate and transpiration rate (&gt; 20% over the control), consequently causing an increase in leaf temperature and crop stress index, prior to growth inhibition (&gt; 15% over the control). A different rate of Al/Fe uptake/translocation in rice genotypes was observed, depending on the tolerant abilities, which showed the leaf toxicities in term of leaf bronzing, chlorosis, gas exchange rate and growth inhibition. Based on the hierarchical clustering heatmap of Ward’s method, 11 candidate Fe + Al tolerant genotypes, namely LuengKwaiLa, NeawHom, Hommali 831, NeawMali, 716 54R, DorDawkMai, GaoRuang88, Hommali 805, RuangDeaw, ChiangPataloong, and FR13A, were classified, which were almost similar to Azucena (a positive-check genotype). The selected Fe and Al tolerant rice genotypes showed potential for cultivation in high Fe and Al-associated stress environments.</p>

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Screening of Rice Genotypes (Oryza sativa L.) for Combined Iron and Aluminium-Stress Tolerance Based on Morpho-Physiological and Metal Uptake/Translocation Attributes

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Suwanna Phukunkamkaew,
  • Rujira Tisarum,
  • Thapanee Samphumphuang,
  • Thanyaporn Sotesaritkul,
  • Sarunyaporn Maksup,
  • Sushil Kumar Himanshu,
  • Avishek Datta,
  • Suriyan Cha-um

摘要

The objective of the present study was to assess morpho-physiological and biochemical changes in rice genotypes under Fe + Al exposure to identify Fe + Al tolerant and sensitive groups. Twenty-eight rice genotypes were grown for 60 days (V5 vegetative stage; rice seedling containing five fully-expanded leaves), and subsequently treated two times with 0 (control) and 50 mM FeSO4 + 10 mM Al2(SO4)3 (Fe + Al treatment) at 45 days (V3 vegetative stage; rice seedling containing three fully-expanded leaves) and 52 days (V4 vegetative stage; rice seedling containing four fully-expanded leaves). The Fe + Al treatment was renewed once a week. Fe content in the root and shoot tissues, and Al content in shoot tissues were increased in all rice genotypes when subjected to the Fe + Al treatment. In contrast, Al content remained unchanged in the root tissues of RuangDeaw, LuengKwaiLa, 716-54R, NeawHom, LuengHom, KaiModRhin3, NaKwan, and LuengThong genotypes when subjected to the Fe + Al treatment. Fe and Al contents in the leaf tissues were significantly increased, leading to a decrease in leaf greenness (> 15% over the control), diminution of photon yield of photosystem II (> 20% over the control), and reducing net photosynthetic rate and transpiration rate (> 20% over the control), consequently causing an increase in leaf temperature and crop stress index, prior to growth inhibition (> 15% over the control). A different rate of Al/Fe uptake/translocation in rice genotypes was observed, depending on the tolerant abilities, which showed the leaf toxicities in term of leaf bronzing, chlorosis, gas exchange rate and growth inhibition. Based on the hierarchical clustering heatmap of Ward’s method, 11 candidate Fe + Al tolerant genotypes, namely LuengKwaiLa, NeawHom, Hommali 831, NeawMali, 716 54R, DorDawkMai, GaoRuang88, Hommali 805, RuangDeaw, ChiangPataloong, and FR13A, were classified, which were almost similar to Azucena (a positive-check genotype). The selected Fe and Al tolerant rice genotypes showed potential for cultivation in high Fe and Al-associated stress environments.