磷水平对不同磷效率水稻生长及磷、锌养分吸收的影响

Effects of Supplied P Levels on Plant Growth and Uptake of P and Zn in Different P-Efficiency Rice

选择4个耐低磷水稻基因型508、99011、580、99112和2个磷敏感基因型99056、99012,用土培盆栽进行全生育期试验,研究不同磷水平对它们生长及吸收利用磷和锌的影响。结果表明,不同耐低磷水稻基因型不仅吸收利用磷的能力不同,对锌的吸收利用也存在差异。耐低磷基因型580、99011和508都具有较大的生物量,且受磷水平影响较小;而耐低磷基因型99112和磷敏感基因型99056、99012生物量都较小且受磷水平影响较大。耐低磷基因型580和99011吸收的磷较多;而508的利用效率更占优势。99056吸收的磷较少,尤其在低磷处理时吸收磷的能力较差;99012对磷的利用效率最低。30mg/kg的磷处理显著提高植株体锌含量。从吸收锌的总量来看,580占绝对优势,其次是99011和508;99012吸收的锌最少,其次是99056。此外,在取样的3个时期,相同磷处理的P/Zn比均以99012最大,99056最小。

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.