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How do nitrogen and phosphorus deficiencies affect strigolactone production and exudation?

Yoneyama K, Xie X, Kim HI, Kisugi T, Nomura T, Sekimoto H, Yokota T, Yoneyama K - Planta (2011)

Bottom Line: Previous studies have demonstrated that phosphorus (P) deficiency, but not nitrogen (N) deficiency, significantly promotes SL exudation in red clover, while in sorghum not only P deficiency but also N deficiency enhances SL exudation.To investigate this possibility in detail, the effects of N and P deficiencies on SL exudation were examined in Fabaceae (alfalfa and Chinese milk vetch), Asteraceae (marigold and lettuce), Solanaceae (tomato), and Poaceae (wheat) plants.In contrast, in Chinese milk vetch, a leguminous plant, and in the other non-leguminous plants examined, N deficiency as well as P deficiency enhanced SL exudation.

View Article: PubMed Central - PubMed

Affiliation: Weed Science Center, Utsunomiya University, 350 Mine-machi, Utsunomiya 321-8505, Japan.

ABSTRACT
Plants exude strigolactones (SLs) to attract symbiotic arbuscular mycorrhizal fungi in the rhizosphere. Previous studies have demonstrated that phosphorus (P) deficiency, but not nitrogen (N) deficiency, significantly promotes SL exudation in red clover, while in sorghum not only P deficiency but also N deficiency enhances SL exudation. There are differences between plant species in SL exudation under P- and N-deficient conditions, which may possibly be related to differences between legumes and non-legumes. To investigate this possibility in detail, the effects of N and P deficiencies on SL exudation were examined in Fabaceae (alfalfa and Chinese milk vetch), Asteraceae (marigold and lettuce), Solanaceae (tomato), and Poaceae (wheat) plants. In alfalfa as expected, and unexpectedly in tomato, only P deficiency promoted SL exudation. In contrast, in Chinese milk vetch, a leguminous plant, and in the other non-leguminous plants examined, N deficiency as well as P deficiency enhanced SL exudation. Distinct reductions in shoot P levels were observed in plants grown under N deficiency, except for tomato, in which shoot P level was increased by N starvation, suggesting that the P status of the shoot regulates SL exudation. There seems to be a correlation between shoot P levels and SL exudation across the species/families investigated.

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Related in: MedlinePlus

Quantities of sorgomol (gray bars), 5-deoxystrigol (dark gray bars), and orobanchyl acetate (black bars) exuded over 24 h (a) and shoot P levels (b) of Chinese milk vetch plants grown in media containing different concentrations of P under –N conditions. Values are mean ± SD of three replicates. Different letters indicate statistically significant differences according to Tukey’s test (P < 0.05)
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Fig4: Quantities of sorgomol (gray bars), 5-deoxystrigol (dark gray bars), and orobanchyl acetate (black bars) exuded over 24 h (a) and shoot P levels (b) of Chinese milk vetch plants grown in media containing different concentrations of P under –N conditions. Values are mean ± SD of three replicates. Different letters indicate statistically significant differences according to Tukey’s test (P < 0.05)

Mentions: SL exudation was not suppressed by P supplementation in plants grown under N deficiency (Fig. 4a), and no increase in shoot P level was observed (Fig. 4b). Similar results were obtained with marigold, lettuce, and wheat, where P supplementation influenced neither SL exudation nor shoot P levels (data not shown).Fig. 4


How do nitrogen and phosphorus deficiencies affect strigolactone production and exudation?

Yoneyama K, Xie X, Kim HI, Kisugi T, Nomura T, Sekimoto H, Yokota T, Yoneyama K - Planta (2011)

Quantities of sorgomol (gray bars), 5-deoxystrigol (dark gray bars), and orobanchyl acetate (black bars) exuded over 24 h (a) and shoot P levels (b) of Chinese milk vetch plants grown in media containing different concentrations of P under –N conditions. Values are mean ± SD of three replicates. Different letters indicate statistically significant differences according to Tukey’s test (P < 0.05)
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3362704&req=5

Fig4: Quantities of sorgomol (gray bars), 5-deoxystrigol (dark gray bars), and orobanchyl acetate (black bars) exuded over 24 h (a) and shoot P levels (b) of Chinese milk vetch plants grown in media containing different concentrations of P under –N conditions. Values are mean ± SD of three replicates. Different letters indicate statistically significant differences according to Tukey’s test (P < 0.05)
Mentions: SL exudation was not suppressed by P supplementation in plants grown under N deficiency (Fig. 4a), and no increase in shoot P level was observed (Fig. 4b). Similar results were obtained with marigold, lettuce, and wheat, where P supplementation influenced neither SL exudation nor shoot P levels (data not shown).Fig. 4

Bottom Line: Previous studies have demonstrated that phosphorus (P) deficiency, but not nitrogen (N) deficiency, significantly promotes SL exudation in red clover, while in sorghum not only P deficiency but also N deficiency enhances SL exudation.To investigate this possibility in detail, the effects of N and P deficiencies on SL exudation were examined in Fabaceae (alfalfa and Chinese milk vetch), Asteraceae (marigold and lettuce), Solanaceae (tomato), and Poaceae (wheat) plants.In contrast, in Chinese milk vetch, a leguminous plant, and in the other non-leguminous plants examined, N deficiency as well as P deficiency enhanced SL exudation.

View Article: PubMed Central - PubMed

Affiliation: Weed Science Center, Utsunomiya University, 350 Mine-machi, Utsunomiya 321-8505, Japan.

ABSTRACT
Plants exude strigolactones (SLs) to attract symbiotic arbuscular mycorrhizal fungi in the rhizosphere. Previous studies have demonstrated that phosphorus (P) deficiency, but not nitrogen (N) deficiency, significantly promotes SL exudation in red clover, while in sorghum not only P deficiency but also N deficiency enhances SL exudation. There are differences between plant species in SL exudation under P- and N-deficient conditions, which may possibly be related to differences between legumes and non-legumes. To investigate this possibility in detail, the effects of N and P deficiencies on SL exudation were examined in Fabaceae (alfalfa and Chinese milk vetch), Asteraceae (marigold and lettuce), Solanaceae (tomato), and Poaceae (wheat) plants. In alfalfa as expected, and unexpectedly in tomato, only P deficiency promoted SL exudation. In contrast, in Chinese milk vetch, a leguminous plant, and in the other non-leguminous plants examined, N deficiency as well as P deficiency enhanced SL exudation. Distinct reductions in shoot P levels were observed in plants grown under N deficiency, except for tomato, in which shoot P level was increased by N starvation, suggesting that the P status of the shoot regulates SL exudation. There seems to be a correlation between shoot P levels and SL exudation across the species/families investigated.

Show MeSH
Related in: MedlinePlus