普通白菜高Zn胁迫耐性及Zn积累特性研究

采用温室砂培盆栽的方法,选用苏州青、黄心乌、瓢儿菜、抗热605、南农矮脚黄5种不同基因型的普通白菜,研究不同供Zn水平(0.43、100、200、400、800mg·L-1)对其高Zn胁迫耐性和Zn积累特性的影响。结果表明:不同供Zn水平处理均提高了5个普通白菜品种的地上部生物量,除800mg·L-1Zn处理显著抑制抗热605根系生长外,对其他品种根系生长影响不显著。5个普通白菜品种的根系耐性指数在0.82～1.90之间,抗热605相对较低,可见普通白菜对Zn胁迫具有较强的耐性,抗热605相对较弱。不同器官的Zn含量和积累量均随供Zn水平的提高而大幅增加,根系Zn含量最高,积累量最低。根系吸收的Zn60%以上被转移到地上部,苏州青、黄心乌、抗热605、南农矮脚黄富集的Zn主要贮存在叶柄中,瓢儿菜富集的Zn更多贮存在叶片中。相对而言,苏州青根系富集Zn的能力最强;南农矮脚黄根系富集Zn能力最弱,但转运能力最强。

Studies on Zinc Tolerance and Accumulation Characteristic of Pakchoi[Brassica campestris L. ssp. chinensis(L.)Makino var. communis Tsen et Lee]

Five genotypes pakchoi〔Brassica campestris L. ssp. chinensis（L.）Makino var. communis Tsen et Lee〕including‘Suzhouqing’,‘Huangxinwu’,‘Piaoercai’,‘Kangre 605’ and‘Nannongaijiaohuang’were selected. The genotypic variations of Zn tolerance and Zn accumulation were studied under 5 different zinc levels（0.43，100，200，400 and 800 mg·L ^-1）by pot experiment with sand culture in solar greenhouse. The results indicated that the shoot biomass of 5 varieties was slightly increased under different zinc levels. Only the root growth of‘Kangre 605’was inhibited under the highest Zn solution, while the roots of the other 4 genotypes were slightly affected. The root tolerance indexes of all the genotypes ranged from 0.82 to 1.90. So they showed very high tolerance to Zn stress. Comparatively, the tolerance of‘Kangre 605’was inferior. The Zn concentration and accumulation in different organs were increased greatly with enhancement of Zn level. The Zn content in roots was the highest. However, Zn accumulation in it was the lowest. More than 60 % Zinc absorbed by roots was transferred to up ground. The redundant zinc absorbed by‘Suzhouqing’,‘Huangxinwu’,‘Kangre 605’and‘Nannongaijiaohuang’was mostly stored in petioles, and leaves were primary storing organ in‘Piaoercai’. Comparatively, Suzhouqing’s ability for accumulating Zn is the strongest. While‘Nannongaijaohuang’is the weakest, but it has very high translocation ability.