摘要
采用盆栽试验系统研究了低磷(P)胁迫条件下不同P效率水稻基因型在分蘖期、孕穗期和成熟期的钙(Ca)、镁(Mg)营养特性.结果表明,低P胁迫对不同基因型水稻Ca、Mg吸收的影响因生育期、基因型和部位不同而不同.分蘖期时,低P胁迫使水稻体内Ca含量增加,低P敏感基因型水稻地上部Mg含量增加,耐低P基因型则Mg含量降低.孕穗期时,低P胁迫使不同基因型水稻体内Ca、Mg含量下降.至成熟期,除99056外,其它基因型籽粒内Ca、Mg含量均降低;除99012外,其它基因型茎叶中Ca、Mg含量也降低.各个时期低P胁迫都降低了Ca、Mg在水稻地上部分的积累量,耐低P基因型只在孕穗期表现出相对的优势.低P胁迫同时降低了成熟期茎叶内Ca、Mg向籽粒的转移,但99056却例外.低P胁迫下,较之低P敏感基因型,耐低P基因型水稻对Ca、Mg的吸收和积累并没有表现出明显的优势.
Potted experiments were conducted to investigate the effect of low-P stress on calcium and magnesium uptake and accumulation with different rice genotypes under various phosphorus stresses at tillering, booting and maturity stages. The result showed that low-P stress had various effects on calcium and magnesium absorbability in different tissues of rice genotypes at different stages. At tillering stage, the calcium content of all tested rice genotypes and the magnesium content in low-P sensitive rice increased under low-P stress, but the magnesium content in low-P tolerance rice genotypes decreased. At booting stage, the calcium and magnesium contents of all the rice genotypes decreased under low-P stress. At maturity stage, the calcium and magnesium contents in seed decreased except 99056, and those in stems and leaves also decreased except 99012. The calcium and magnesium accumulations in shoots of all the tested rice genotypes decreased under low-P stress at any stage, and those of low-P tolerance rice genotypes had relative advantage over low-P sensitive rice. At the same time, low-P stress decreased the transfer of calcium and magnesium from stems and leaves to seeds at maturity stage except 99056. The low-P tolerance rice genotypes did not show greater advantage in uptaking and accumulating calcium and magnesium than low-P sensitive rice did under low-P stress.
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2009年第3期295-300,共6页
Chinese Journal of Applied and Environmental Biology
基金
国家"973"项目"水稻重要新基因的发掘与有效利用研究"(No. G1998010204)~~
关键词
低磷胁迫
水稻
基因型
钙
镁
生育期
low phosphorus stress
rice
genotype
calcium
magnesium
growth stage
