Scholarlink

<p><i>Eugenia</i> (Myrtaceae) is a Neotropical genus that produces desiccation-sensitive (DS) seeds, for which the metabolism of desiccation damage remains unclear. We analyzed polyamines (PAs), antioxidant enzymes, and malondialdehyde (MDA) in seeds of <i>E. pyriformis</i>, <i>E. involucrata</i>, <i>E. brasiliensis</i>, and <i>E. astringens</i> at four water contents (WC) to investigate their relationship with DS. Species differed in their WC thresholds for viability loss, with <i>E. pyriformis</i> and <i>E. involucrata</i> reaching 50% germination at slightly higher WC than <i>E. brasiliensis</i> and <i>E. astringens</i>. Desiccation induced distinct PAs and antioxidant enzymes across species and WC. Putrescine (PUT) increased during desiccation in <i>E. pyriformis</i> and <i>E. involucrata</i>, whereas spermidine (SPD) increased in <i>E. brasiliensis</i> and <i>E. astringens</i>. Changes in PA ratio were species-specific, with marked reductions in <i>E. pyriformis</i> and <i>E. involucrata</i>. Spermine (SPM) decreased in all species during desiccation. Superoxide dismutase rose in <i>E. involucrata</i> and <i>E. astringens</i>, and catalase rose in <i>E. pyriformis</i>. Ascorbate peroxidase decreased at the WC threshold, except in <i>E. involucrata</i>, and glutathione reductase declined in all species. MDA accumulated in <i>E. pyriformis</i>, <i>E. involucrata</i>, and <i>E. brasiliensis</i>, correlating positively with WC decrease in the first two and correlating positively with PA ratio in <i>E. brasiliensis</i>, whereas <i>E. astringens</i> showed increased MDA only in unviable seeds. Correlation analysis also revealed distinct associations between WC, MDA, PAs, and antioxidant enzymes. Our results reveal species-specific responses of PAs and antioxidant enzymes during desiccation in <i>Eugenia</i> seeds. Correlation analyses provided limited evidence of coordinated responses between these two systems, which may have contributed to metabolic imbalance and viability loss.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Polyamines and antioxidant enzymes are involved in the seed desiccation sensitivity of Eugenia (Myrtaceae) species

  • 期刊论文

  • 发表日期：

    2026年7月21日

查看全文
  • Guilherme Almeida Garcia Rodrigues,
  • Maiara Iadwizak Ribeiro,
  • Claudio Jose Barbedo,
  • Neusa Steiner

摘要

Eugenia (Myrtaceae) is a Neotropical genus that produces desiccation-sensitive (DS) seeds, for which the metabolism of desiccation damage remains unclear. We analyzed polyamines (PAs), antioxidant enzymes, and malondialdehyde (MDA) in seeds of E. pyriformis, E. involucrata, E. brasiliensis, and E. astringens at four water contents (WC) to investigate their relationship with DS. Species differed in their WC thresholds for viability loss, with E. pyriformis and E. involucrata reaching 50% germination at slightly higher WC than E. brasiliensis and E. astringens. Desiccation induced distinct PAs and antioxidant enzymes across species and WC. Putrescine (PUT) increased during desiccation in E. pyriformis and E. involucrata, whereas spermidine (SPD) increased in E. brasiliensis and E. astringens. Changes in PA ratio were species-specific, with marked reductions in E. pyriformis and E. involucrata. Spermine (SPM) decreased in all species during desiccation. Superoxide dismutase rose in E. involucrata and E. astringens, and catalase rose in E. pyriformis. Ascorbate peroxidase decreased at the WC threshold, except in E. involucrata, and glutathione reductase declined in all species. MDA accumulated in E. pyriformis, E. involucrata, and E. brasiliensis, correlating positively with WC decrease in the first two and correlating positively with PA ratio in E. brasiliensis, whereas E. astringens showed increased MDA only in unviable seeds. Correlation analysis also revealed distinct associations between WC, MDA, PAs, and antioxidant enzymes. Our results reveal species-specific responses of PAs and antioxidant enzymes during desiccation in Eugenia seeds. Correlation analyses provided limited evidence of coordinated responses between these two systems, which may have contributed to metabolic imbalance and viability loss.