Influence of Phosphorus and Endomycorrhiza (Glomus Intraradices) on gas exchange and plant growth of Chile Ancho Pepper (Capsicum Annuum L. cv. San Luis) |
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Authors: | Aguilera-Gomez L Davies FT Jr Olalde-Portugal V Duray SA Phavaphutanon L |
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Institution: | (1) Department of Horticultural Sciences, Texas A&;M University, College Station, Texas 77843-2133, USA |
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Abstract: | Seedlings of chile ancho pepper were grown in pots containing a pasteurized mixture of sand and a low phosphorus (P) sandy
loam soil, and either inoculated (VAM) or not inoculated (NVAM) with the endomycorrhizal fungus Glomus intraradices. Long
Ashton nutrient solution (LANS) was modified to supply P to the seedlings at 0, 11, and 44 g(P) m-3 (P0, P11, P44, respectively). Low P depressed net photosynthetic rate (PN), stomatal conductance (gs), phosphorus use efficiency (PN/P), and internal CO2 concentration (Ci). The mycorrhiza alleviated low P effects by increasing PN, gs, PN/P, and decreasing Ci. At P0, Ci of NVAM plants was equal to or higher than that of VAM plants, suggesting nonstomatal inhibition of photosynthesis. Gas exchange
of VAM plants at P0 was similar to that of NVAM plants at P11. Endomycorrhiza increased leaf number, leaf area, shoot, root and fruit mass at
P0 and P11 compared to NVAM plants. Reproductive growth was enhanced by 450 % in mycorrhizal plants at P44. Root colonization (arbuscules, vesicles, internal and extraradical hyphae development) was higher at lower P concentrations,
while sporulation was unaffected. The enhanced growth and gas exchange of mycorrhizal plants was in part due to greater uptake
of P and greater extraradical hyphae development.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | fruit internal CO2 concentration leaf area ratio leaf number and area net photosynthetic rate phosphorus use efficiency root shoot stomatal conductance |
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