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Related Concept Videos

Responses to Salt Stress02:02

Responses to Salt Stress

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Frequency-dependent Selection

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Related Experiment Video

Updated: May 13, 2026

Plant Growth and Agrobacterium-mediated Floral-dip Transformation of the Extremophyte Schrenkiella parvula
06:32

Plant Growth and Agrobacterium-mediated Floral-dip Transformation of the Extremophyte Schrenkiella parvula

Published on: January 7, 2019

Repeated evolution of salt-tolerance in grasses.

T H Bennett1, T J Flowers, L Bromham

  • 1Centre for Macroevolution and Macroecology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory 0200, Australia. tom.bennett@anu.edu.au

Biology Letters
|March 1, 2013
PubMed
Summary

Salt tolerance evolves frequently in grasses, appearing over 70 times across diverse lineages. However, this trait rarely leads to large groups of salt-tolerant species, hindering crop development.

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Analysis of Effect of Compound Salt Stress on Seed Germination and Salt Tolerance Analysis of Pepper (Capsicum annuum L.)

Published on: November 30, 2022

Area of Science:

  • Evolutionary biology
  • Plant science
  • Agricultural science

Background:

  • Increasing global salt-affected soils necessitate salt-tolerant crops.
  • Few salt-tolerant cereal crops are commercially available despite breeding efforts.
  • Naturally salt-tolerant grass species are abundant, posing a puzzle for breeding.

Purpose of the Study:

  • Investigate the evolutionary lability of salt tolerance in the grass family (Poaceae).
  • Understand why salt tolerance is common in nature but difficult to breed into crops.
  • Utilize a biodiversity-based, phylogenetic approach to study salt tolerance evolution.

Main Methods:

  • Analyzed the phylogenetic distribution of salt tolerance across 2684 grass species.
  • Confirmed findings using a genus-level phylogeny of over 800 grass genera.
  • Examined the evolutionary history and frequency of salt tolerance trait acquisition.

Main Results:

  • Salt tolerance has evolved independently over 70 times in diverse grass lineages.
  • The trait's evolution is not restricted to specific clades, indicating broad potential.
  • Despite frequent evolution, salt tolerance seldom results in large, distinct clades of tolerant species.

Conclusions:

  • Salt tolerance is an evolutionarily labile trait in grasses, frequently appearing and disappearing.
  • The difficulty in breeding salt-tolerant crops may stem from the trait's transient nature.
  • Further research into the genetic and ecological factors governing salt tolerance stability is warranted.