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Increased resistance to a generalist herbivore in a salinity-stressed non-halophytic plant

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ABSTRACT

During their life, plants face multiple stresses. However, studies on one stress factor have typically neglected possible interactions with other factors. We demonstrated that salt stress in Indian mustard (a plant species not adapted to salinity) lessens the effect of herbivory on plant mass, and increases the plants' constitutive resistance to herbivores. Changes in the plants associated with increased salt that help to explain the mitigation of herbivore effects include decreased protein and macronutrient content. Plants exposed to herbivore damage were also less negatively affected by salt exposure, possibly due to their ability to maintain higher levels of transpiration.

No MeSH data available.


Tolerance to herbivory of Brassica juncea plants grown at different levels of NaCl. Tolerance was measured as the difference between the mean seed production of two individuals subjected to removal of 50% leaf area and that of two undamaged individuals per replicate (n = 5 per salinity level; see text for details).
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plw028-F4: Tolerance to herbivory of Brassica juncea plants grown at different levels of NaCl. Tolerance was measured as the difference between the mean seed production of two individuals subjected to removal of 50% leaf area and that of two undamaged individuals per replicate (n = 5 per salinity level; see text for details).

Mentions: Constitutive resistance increased with salinity (F1,13 = 5.559, P = 0.0347; Fig. 3). Plants grown at 100 mM NaCl were 36% more resistant than those in 0 mM NaCl. Interestingly, induced resistance levels did not vary with salinity level (F1,13 = 0.045, P =0.8370) but were similar to the mean constitutive resistance of plants grown at 100 Mm NaCl. We did not find a statistically significant effect of salinity on the tolerance of B. juncea to herbivory by T. ni, (Kruskal–Wallis chi-squared = 3.44, d.f. = 2, P = 0.1791; Fig. 4). We tested also a quadratic model, but it did not fit the data either (Kruskal–Wallis chi-squared = 2.94, d.f. = 1, P = 0.0864. We also observed that variability in the response to damage clearly increased in both the 50 and 100 mM NaCl treatments relative to the no-salt treatment. Herbivory had a detrimental effect on seed production of plants in the no-salt treatment (Delta-seeds value significantly less than zero; one-tailed Wilcoxon Signed Rank test, V = 0, P = 0.0312; Fig. 4), but such detrimental effect of herbivory was not evident at 50 or 100 mM NaCl.Figure 3.


Increased resistance to a generalist herbivore in a salinity-stressed non-halophytic plant
Tolerance to herbivory of Brassica juncea plants grown at different levels of NaCl. Tolerance was measured as the difference between the mean seed production of two individuals subjected to removal of 50% leaf area and that of two undamaged individuals per replicate (n = 5 per salinity level; see text for details).
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4940500&req=5

plw028-F4: Tolerance to herbivory of Brassica juncea plants grown at different levels of NaCl. Tolerance was measured as the difference between the mean seed production of two individuals subjected to removal of 50% leaf area and that of two undamaged individuals per replicate (n = 5 per salinity level; see text for details).
Mentions: Constitutive resistance increased with salinity (F1,13 = 5.559, P = 0.0347; Fig. 3). Plants grown at 100 mM NaCl were 36% more resistant than those in 0 mM NaCl. Interestingly, induced resistance levels did not vary with salinity level (F1,13 = 0.045, P =0.8370) but were similar to the mean constitutive resistance of plants grown at 100 Mm NaCl. We did not find a statistically significant effect of salinity on the tolerance of B. juncea to herbivory by T. ni, (Kruskal–Wallis chi-squared = 3.44, d.f. = 2, P = 0.1791; Fig. 4). We tested also a quadratic model, but it did not fit the data either (Kruskal–Wallis chi-squared = 2.94, d.f. = 1, P = 0.0864. We also observed that variability in the response to damage clearly increased in both the 50 and 100 mM NaCl treatments relative to the no-salt treatment. Herbivory had a detrimental effect on seed production of plants in the no-salt treatment (Delta-seeds value significantly less than zero; one-tailed Wilcoxon Signed Rank test, V = 0, P = 0.0312; Fig. 4), but such detrimental effect of herbivory was not evident at 50 or 100 mM NaCl.Figure 3.

View Article: PubMed Central - PubMed

ABSTRACT

During their life, plants face multiple stresses. However, studies on one stress factor have typically neglected possible interactions with other factors. We demonstrated that salt stress in Indian mustard (a plant species not adapted to salinity) lessens the effect of herbivory on plant mass, and increases the plants' constitutive resistance to herbivores. Changes in the plants associated with increased salt that help to explain the mitigation of herbivore effects include decreased protein and macronutrient content. Plants exposed to herbivore damage were also less negatively affected by salt exposure, possibly due to their ability to maintain higher levels of transpiration.

No MeSH data available.