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Alternative Strategies in Response to Saline Stress in Two Varieties of Portulaca oleracea (Purslane).

Mulry KR, Hanson BA, Dudle DA - PLoS ONE (2015)

Bottom Line: The varieties responded to saline stress with significantly different changes in the measured traits, which included inter alia biomass, flower counts, proline concentrations and betalain pigment concentrations.Taken holistically, our results suggest that the two varieties employ different strategies in allocating resources to cope with saline stress.This conclusion establishes purslane as a suitable model system for the study of saline stress and the molecular basis for differential responses.

View Article: PubMed Central - PubMed

Affiliation: Dept. of Chemistry & Biochemistry, DePauw University, Greencastle, Indiana, United States of America.

ABSTRACT
Purslane (Portulaca oleracea) is a globally-distributed plant with a long history of use in folk medicine and cooking. We have developed purslane as a model system for exploring plant responses to stress. We exposed two varieties of purslane to saline stress with the objective of identifying differences between the varieties in the plasticity of morphological and physiological traits. The varieties responded to saline stress with significantly different changes in the measured traits, which included inter alia biomass, flower counts, proline concentrations and betalain pigment concentrations. The alternative responses of the two varieties consisted of complex, simultaneous changes in multiple traits. In particular, we observed that while both varieties increased production of betalain pigments and proline under saline stress, one variety invested more in betalain pigments while the other invested more in proline. Proline and betalain pigments undoubtedly play multiple roles in plant tissues, but in this case their role as antioxidants deployed to ameliorate saline stress appears to be important. Taken holistically, our results suggest that the two varieties employ different strategies in allocating resources to cope with saline stress. This conclusion establishes purslane as a suitable model system for the study of saline stress and the molecular basis for differential responses.

No MeSH data available.


A: Variety T-16; B: Variety WI-9.Plants on the left were treated with 0 mM NaCl while plants on the right were treated with 200 mM NaCl.
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pone.0138723.g001: A: Variety T-16; B: Variety WI-9.Plants on the left were treated with 0 mM NaCl while plants on the right were treated with 200 mM NaCl.

Mentions: Both varieties of purslane responded to saline stress with significant changes in morphological and physiological traits including a reduced investment in reproductive structures (Fig 1). However, the two varieties varied significantly in their specific responses to the saline environment, demonstrating that these varieties of Portulaca oleracea employ alternative strategies to cope with this type of stress.


Alternative Strategies in Response to Saline Stress in Two Varieties of Portulaca oleracea (Purslane).

Mulry KR, Hanson BA, Dudle DA - PLoS ONE (2015)

A: Variety T-16; B: Variety WI-9.Plants on the left were treated with 0 mM NaCl while plants on the right were treated with 200 mM NaCl.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4580602&req=5

pone.0138723.g001: A: Variety T-16; B: Variety WI-9.Plants on the left were treated with 0 mM NaCl while plants on the right were treated with 200 mM NaCl.
Mentions: Both varieties of purslane responded to saline stress with significant changes in morphological and physiological traits including a reduced investment in reproductive structures (Fig 1). However, the two varieties varied significantly in their specific responses to the saline environment, demonstrating that these varieties of Portulaca oleracea employ alternative strategies to cope with this type of stress.

Bottom Line: The varieties responded to saline stress with significantly different changes in the measured traits, which included inter alia biomass, flower counts, proline concentrations and betalain pigment concentrations.Taken holistically, our results suggest that the two varieties employ different strategies in allocating resources to cope with saline stress.This conclusion establishes purslane as a suitable model system for the study of saline stress and the molecular basis for differential responses.

View Article: PubMed Central - PubMed

Affiliation: Dept. of Chemistry & Biochemistry, DePauw University, Greencastle, Indiana, United States of America.

ABSTRACT
Purslane (Portulaca oleracea) is a globally-distributed plant with a long history of use in folk medicine and cooking. We have developed purslane as a model system for exploring plant responses to stress. We exposed two varieties of purslane to saline stress with the objective of identifying differences between the varieties in the plasticity of morphological and physiological traits. The varieties responded to saline stress with significantly different changes in the measured traits, which included inter alia biomass, flower counts, proline concentrations and betalain pigment concentrations. The alternative responses of the two varieties consisted of complex, simultaneous changes in multiple traits. In particular, we observed that while both varieties increased production of betalain pigments and proline under saline stress, one variety invested more in betalain pigments while the other invested more in proline. Proline and betalain pigments undoubtedly play multiple roles in plant tissues, but in this case their role as antioxidants deployed to ameliorate saline stress appears to be important. Taken holistically, our results suggest that the two varieties employ different strategies in allocating resources to cope with saline stress. This conclusion establishes purslane as a suitable model system for the study of saline stress and the molecular basis for differential responses.

No MeSH data available.