关键词: 水稻, 基因型差异, 生物量, 磷, 锌

Abstract: Four low-P tolerant rice genotypes and two low-P sensitive rice genotypes were used in a pot culture experiment with four supplied P levels (P30, 30 mg/kg P; P50, 50 mg/kg P; P100, 100 mg/kg P; P200, 200 mg/kg P).Rice genotypes with different P-efficiency had varietal difference in uptake and use ability of P and Zn. Low-P tolerant rice genotypes 580 and 99011 absorbed more P than the others, and 580 had better uptake ability especially at low-P level such as P50 and P30. Rice genotype 508 could absorb considerable amounts of P, and had the lowest P percentage in shoot, indicating it had good performance in P use efficiency. So these three rice genotypes had larger biomass and less response to changed P level than 99112, 99056 and 99012. Rice genotype 99112 showed low-P tolerance mainly by sacrificing biomass production to keep high relative grain yield. 99056 had the lowest P uptake efficiency, and 99012 had the lowest P use efficiency. Zn contents in shoots of P200, P100 and P50 were similar, but increased significantly at P30. Zn content in shoot of 99112, 99056 and 99012 were higher than those of 508, 99011 and 580, especially at tillering stage and booting stage. As for total Zn in shoot, low-P tolerant rice genotype 580 had the largest amount followed by 99011 and 508, low-P tolerant rice genotype 99012 had the lowest at the three sampling stages followed by 99056. Furthermore, P/Zn in shoot of 99012 was the highest, but that of 99056 was the lowest at the same P level.

Key words: rice, genotypic difference, biomass, phosphorus, zinic