水分胁迫对不同基因型油菜的生态适应性影响

采用盆栽试验,通过对不同基因型油菜(渝油20、陇油4、陇2-1、青油331-2)的叶片丙二醛(MDA)含量、根系活力、生物产量、抗氧化物酶(SOD、POD)活性以及叶细胞膜透性的测定分析,研究了水分胁迫对油菜生态适应性的影响。结果表明,随水分胁迫程度的加强,4种不同基因型油菜幼苗的MDA含量、叶细胞膜透性以及SOD和POD活性均逐渐增加,而随水分胁迫程度的减小,4种不同基因型油菜幼苗的根系活力和地上生物产量均逐渐提高,但各生理生化指标变化趋势不尽一致,这反映了油菜对水分胁迫适应性反应途径的多样性。4种不同油菜基因型品种综合抗旱生态适应性强弱为:青油331-2最强,陇2-1、陇油4次之,渝油20相对最差。

Eco-adaptable mechanism of water deficiency among genotypes rape

Effects of ecological adaptability on lacking water rape plant were studied by pot experiments,and the leaves malondialdehyde(MDA) content and roots activities and biomass yield and the superoxide dismutase(SOD) activity and catalase(POD) activity and cell membrane permeability of rape seedling were mensurated on different genotypes of rape varieties(Yuyou 20,Longyou 4,Long 2-1 and Qingyou 331-2).The results showed that MDA content,cell membrane permeability,SOD activity and POD activity of 4 different genotypes of rape seedlings were gradually increased with the enhancement of water intimidated level,but roots activities and overground biomass yield were reduced.The change trend of physiological and chemical indices was not accordant in experiments,which indicated that responses approach of water stress adaptability had diversity in rape cropping.According to the results of analysis and comparison study,eco-adaptability capability of drought resistance of 4 different genotypes of rape varieties was that Qingyou 331-2 became the strongest,Longyou 2-1 took the second place,Longyou 4 was relatively poor and Yuyou 20 showed the lowest.