Phosphorus mobilization and uptake in mycorrhizal rice (Oryza sativa L.) plants under flooded and non-flooded conditions | Mobilizacija in privzem fosforja v rižu (Oriza sativa L.) v prisotnosti mikoriznih gliv s poplavnim namakanjem in brez le-tega

Inglés. Phosphorus (P) deficiency severely limits rice production in the world. Colonization of plant root with arbuscular mycorrhizal fungi (AMF) may have a considerable consequence for P uptake and plant growth. In contrast to other crop species, there is little experimental evidence about the role of mycorrhizal colonization in lowland rice plants. This study was undertaken to examine whether inoculation of rice plants can contribute in the mobilization and uptake of insoluble P form. In addition, an attempt was made to compare flooded plants with non-flooded ones in their mycorrhizal responsiveness. In one experiment, insoluble P was supplied for plants inoculated either with Glomus mosseae or Glomus intraradices, then growth and P uptake was determined. Results showed that colonization with AMF significantly improved uptake of P derived from insoluble P source. In other experiment, rice plants were inoculated with Glomus mosseae or Glomus intraradices in non-flooded nurseries and then transplanted either to flooded or non-flooded conditions. Root colonization by AMF was decreased due to flooding conditions from 43% to 27%. Nevertheless, the plant growth responded positively (117% increase) to inoculation when grown at flooded conditions, while dry matter of non-flooded plants was diminished up to 64% by inoculation. Mycorrhizal colonization had also a significant contribution in the uptake of P and K in flooded but not in non-flooded plants.

Esloveno. Pomanjkanje fosforja (P) omejuje svetovno pridelavo riža. Naselitev rastlinskih korenin z arbuskularnimi mikoriznimi glivami (AMF) bi lahko pomembno vplivala na privzem P in rast rastlin. Poskusni podatki o vlogi mikorizne kolonizacije riževih rastlin so v primerjavi z nekaterimi drugimi vrstami rastlin redki. Ta raziskava je bila zastavljena, da bi proučili, ali inokulacija korenin riža z mikoriznimi glivami vpliva na mobilizacijo in privzem netopne oblike P. Mikorizna odzivnost je bila preizkušena v razmerah z in brez uporabe poplavnega namakanja. Netopna oblika P je bila dodana rastlinam, inokuliranim z Glomus mosseae ali Glomus intraradices, opazovana je bila rast rastlin in privzem P. Naselitev riževih korenin z AMF je vplivala na povečan privzem P iz netopnega vira tega elementa. V drugem poskusu so bile rastline inokulirane z istima vrstama mikoriznih gliv v nepoplavnih razmerah in nato presajene v poplavne in nepoplavne razmere. Naselitev korenin z AMF se je v poplavnih razmerah znižala s 43% na 27%. Kljub temu je bil odziv rastlin na inokulacijo in izpostavitev poplavnim razmeram pozitiven, rast se je povečala za 117%, medtem ko se je suha snov rastlin iz nepoplavnih razmer zmanjšala za 64%. Inokulacija z mikoriznimi glivami je prav tako pomembno vplivala na privzem P in K v poplavnih razmerah, tega vpliva pa ni bilo mogoče zaznati pri rastlinah v nepoplavnih razmerah.