Förster H, Adaskaveg J E, Kim D H, Stanghellini M E
Department of Plant Pathology, University of California, Riverside 92521.
Plant Dis. 1998 Oct;82(10):1165-1170. doi: 10.1094/PDIS.1998.82.10.1165.
Tomato and pepper plants were grown hydroponically in a greenhouse using phosphate or technical and commercial formulations of phosphite as sources of phosphorus nutrition to determine the effects on plant development and susceptibility to Phytophthora root and crown rot. Phosphite-treated tomato and pepper plants were deficient of phosphate and developed phosphorus-deficiency symptoms. Growth of plants (leaf area and leaf, stem, and root dry weights) that were fertilized with phosphite was significantly (P < 0.05) reduced compared with phosphate-fertilized plants. In Phytophthora capsici-inoculated pepper plants, incidence of Phytophthora crown rot was significantly reduced in phosphite-treated plants compared with no phosphorus or phosphate-treated plants. Incidence of crown rot in pepper plants treated with 1 mM phosphate plus 0.3 mM phosphite was intermediate between plants treated with only phosphite (1 mM or 0.1 mM) and plants treated with phosphate (1 mM).
番茄和辣椒植株在温室中采用水培法种植，以磷酸盐或亚磷酸盐的工业及商业配方作为磷营养源，以确定其对植株发育以及对疫霉根腐病和冠腐病易感性的影响。经亚磷酸盐处理的番茄和辣椒植株缺乏磷酸盐，并出现了缺磷症状。与施磷酸盐的植株相比，施亚磷酸盐的植株生长（叶面积以及叶、茎和根的干重）显著（P<0.05）降低。在接种辣椒疫霉的辣椒植株中，与不施磷或施磷酸盐的植株相比，经亚磷酸盐处理的植株中疫霉冠腐病的发病率显著降低。用1 mM磷酸盐加0.3 mM亚磷酸盐处理的辣椒植株中冠腐病的发病率介于仅用亚磷酸盐（1 mM或0.1 mM）处理的植株和用磷酸盐（1 mM）处理的植株之间。
