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Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce (Lactuca sativa) Germplasm Collections
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Selenium accumulation in lettuce germplasm.

Silvio J Ramos1, Michael A Rutzke, Ryan J Hayes

  • 1Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, NY 14853, USA.

Planta
|December 15, 2010
PubMed
Summary
This summary is machine-generated.

Lettuce can be biofortified with selenium (Se) to combat deficiency. Different Se forms impact plant growth and Se accumulation, with selenate being more effective for increasing crop Se levels.

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Nutritional Science

Background:

  • Selenium (Se) is a vital micronutrient for human and animal health.
  • Low Se intake is a global concern, necessitating strategies like crop biofortification.
  • Increasing Se content in staple foods, such as lettuce, is a viable approach.

Purpose of the Study:

  • To assess Se accumulation and plant responses in diverse lettuce accessions.
  • To compare the efficacy of selenate and selenite for Se biofortification.
  • To investigate the impact of Se on lettuce growth, nutritional status, and gene expression.

Main Methods:

  • Evaluation of 30 Lactuca sativa L. accessions for Se accumulation.
  • Application of selenate and selenite to assess plant growth and nutritional changes.
  • Analysis of gene expression related to Se/S uptake and assimilation.

Main Results:

  • Lettuce accessions exhibited varied responses to selenate and selenite treatments.
  • Selenate significantly increased total Se accumulation compared to selenite.
  • A two-fold difference in Se levels was observed between high and low accumulating cultivars.
  • Synergistic Se and sulfur accumulation occurred with selenate treatment.
  • Selenate promoted shoot biomass and antioxidant enzyme activity, while selenite inhibited growth.
  • Differential gene expression in Se/S uptake and assimilation pathways was linked to Se accumulation capacity.

Conclusions:

  • Lettuce exhibits significant genotypic variation in Se accumulation and response to different Se forms.
  • Selenate is more effective than selenite for enhancing Se content in lettuce.
  • Se biofortification in lettuce influences plant growth, metabolism, and antioxidant defense mechanisms.
  • Understanding gene expression is key to developing Se-biofortified lettuce cultivars.
  • These findings support the selection and development of lettuce varieties for improved Se nutrition.