不同盐碱区菊芋植株K~+和Na~+的分布特征

目的]研究不同盐碱区域对菊芋离子分布的影响。方法]以红块茎菊芋品种JY1及白块茎菊芋品种NY1、BY1为试验材料,研究了非盐、轻盐、重盐3种不同盐碱区条件下块茎、茎干和叶片的离子分布特征。结果]随着土壤盐分的增加,菊芋茎干和叶片的K~+含量均增加,其中茎干中K~+含量显著增加,重盐下达到16.1 mg/g,达叶片的7.0倍以上;块茎K~+含量的变动幅度不大。随土壤盐分的增加,茎干、叶片、块茎的Na~+含量逐渐升高,其中茎干的增加幅度最大,重盐条件下Na~+含量较非盐条件下增加11.0倍以上;叶片Na~+含量的变化幅度不显著;重盐条件下,各部位Na~+含量从高到低依次为:茎干、块茎、叶片。植株各部位的K~+/Na~+从高到低依次为叶片、块茎、茎干。结论]该研究可为耐盐品种的筛选及不同盐碱地条件下的菊芋栽培提供理论基础。

Distribution Characteristics of K +and Na +in Helianthus tuberosus L.in Different Saline and Alkaline Area

Objective] To study the effects of different saline and alkaline areas on the ion distribution in Helianthus tuberosus L..Method] With red tuber variety JY1 of H.tuberosus and white tuber varieties NY1, BY1 of H.tuberosus as test materials, ion distribution characteristics in the tuber, stem and leaves of H.tuberosus in three kinds of saline and alkaline areas of non-saline, low-saline and heavy-saline were studied. Result] With the increase of soil salinity, K +content in the stem and leaves of H.tuberosus increased.K +content in the stem of H.tuberosus significantly increased, and it reached 16.1 mg/g in heavy-saline area, which was 7.0 times higher than that in the leaves.K +content in the tu-ber of H.tuberosus had little change.With the increase of soil salinity, Na +content in the stem, leaves and tuber of H.tuberosus gradually in-creased.Na +content in the stem had the maximum increasing amplitude , and that under heavy salt conditions was 11.0 times higher than that under non salt conditions.Na +content in the leaves of H.tuberosus had no significant change.Under heavy salt conditions, the order of Na +content in different parts was stem >tuber>leaves.The order of K +/Na +in different parts was leaves >tuber>stem. Conclusion] The re-search can provide theoretical basis for the screening of salt-tolerant varieties and the cultivation of H.tuberosus in different saline and alkaline areas.