耐低钾切花菊品种筛选及其苗期耐性生理研究

 对23 个切花菊品种进行苗期耐低钾指标的筛选研究，结果表明，植物干质量、钾含量、钾积累量在不同钾浓度处理和不同品种之间均存在显著差异，可以作为切花菊耐低钾能力的评价指标。依据耐低钾指标，筛选出耐低钾品种‘南农银山’和‘南农菲紫’，不耐低钾品种‘南农红枫’。通过水培试验研究了不同耐性切花菊品种幼苗对低钾胁迫的生物响应。结果表明：低钾胁迫下耐性弱的‘南农红枫’叶绿素含量显著降低，SOD 及POD 活性均明显降低，耐性品种‘南农银山’和‘南农菲紫’没有显著性变化。此外，低钾条件下耐性品种的可溶性糖含量显著降低，淀粉含量没有显著性差异，而耐性弱的品种可溶性糖含量没有显著差异，淀粉含量显著下降。

Screening Cut Chrysanthemum Varieties in Low Potassium Tolerant and Patience Physiology in Seedling

Twenty-three cut chrysanthemum varieties were hydroponically cultured to screenhypokalemia indicators in seedling and the results showed that in different potassium，plant dry weight，theamount of potassium and potassium accumulation are significant different between different varieties.These may be the evaluation indicators of cut chrysanthemum resistance hypokalemia ability. Based onpotassium indicators screened tolerance varieties‘Nannong Yinshan’and‘Nannong Feizi’，intolerancevariety ‘ Nannong Hongfeng ’ . Different patience cut chrysanthemum varieties seedlings werehydroponically cultured to study the biological response under low potassium stress and the results showedthat under low potassium stress the‘Nannong Hongfeng’chlorophyll content was significantly reduced，SOD and POD activity were significantly reduced，‘Nannong Yinshan’and‘Nannong Feizi’haven’tsignificantly change. Furthermore，soluble sugar content of tolerant varieties were significantly lower andamylum content have no significant difference. Soluble sugar content of patience weak varieties have nosignificant difference，but amylum content decreased significant.