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Effect of phosphorus stress on gas exchange, plant
growth and mycorrhizal development of Capsicum annuum
cv. San Luis (chile ancho pepper)
POSTER X
AGUILERA, L.2, F.T. DAVIES,
JR.1, V. OLALDE-PORTUGAL2, S.A.
DURAY1 & L. PHAVAPHUTANON1
1Dept. of Horticultural Sciences, Texas A&M
University, College Station, TX 77843, and
2CINVESTAV Plant Biology Inst., Irapuato,
Mexico
ICOM1 Abstract
Seedlings of Capsicum annuum L. cv. San Luis were grown
in pots containing a pasteurized mixture of sand and
sandy loam soil inoculated or noninoculated with the
endomycorrhizal (VAM) fungus Glomus intraradices. Long
Ashton nutrient solution (LANS) was modified to supply
phosphorus at 0, 11 or 44 mg P ml-1. Diurnal
gas exchange measurements were taken 15, 30 and 50 days
after the experiment was initiated. Gas exchange and net
photosynthesis were enhanced by mycorrhiza and full
strength LANS fertilization (44 mg P ml-1).
Under P stress (0 mg P ml-1), VAM plants had
greater gas exchange and net photosynthesis compared to
Non-VAM plants. At all P levels, the symbiosis
increased leaf nutrient content of P, K, Mg, S, Fe, Mn,
Zn, Cu, B, Mo, and Al. Mycorrhizal plants had higher
shoot dry weights, leaf number, leaf area, and fruit
primordia than nonmycorrhizal plants at 0 and 11 mg P
ml-1 P. Growth of VAM plants at 0 mg P
ml-1 was similar to Non-VAM plants at 11 mg P
ml-1 P. Root colonization (arbuscules,
vesicles, internal and extraradical hyphae development)
were higher at 0 and 11 mg ml-1 P. The
quantity of spores recovered in soil was independent of
P treatments.