高原夏季胡萝卜肉质根膨大与内源激素含量的关系

Endogenous hormone content in relation to thickening of carrot fleshy root during summer season in plateau region

以"新秀三红"、"岐山透心红"和"地方透心红"的肉质根为材料,采用酶联免疫吸附法,研究了高原夏季胡萝卜肉质根膨大与内源激素含量的关系。结果表明,出苗35 d后,肉质根的日鲜重增长速率持续增高后又逐渐下降,肉质根的库活性逐渐降低;与正常肉质根相比,抽薹肉质根的日鲜重增长速率较低,干鲜重比值较高,差异均达极显著水平。胡萝卜肉质根干重与GA3含量呈极显著或显著正相关,与IAA、IPA含量呈极显著或显著负相关;IAA和GA4含量与肉质根干鲜重比值呈极显著正相关,而IAA、GA4、ABA、GA3、IPA、DHZR含量与肉质根的库活性呈极显著正相关。内源激素是通过调控肉质根的库活性来促进高原夏季胡萝卜肉质根的膨大。

Using ELISA analysis,the relation between endogenous hormone content and the thickening of fleshy roots of carrot（Daucus carrot L.var.sativa DC.） in summer seasons in plateau regions were analyzed.Normal fleshy roots of three carrot varieties（＂Xinxiusanhong＂,＂Qishantouxinhong＂ and ＂Difangtouxinhong＂） and bolting fleshy roots of ＂Qishangtouxinhong＂ were planted and investigated.Results showed that after seedling emergency for 35 days,growth rate of carrot fleshy roots of the three varieties initially increased and then decreased,sink activity continually dropped.Compared with normal fleshy roots,bolting fleshy roots had significantly lower growth rate and higher dry-to-fresh weight ratio（P1%）.Fleshy root dry weight was positively correlated with GA3 content,but negatively correlated with IAA and IPA contents at 5%～1% significance level.IAA and GA4 contents were also positively correlated with fleshy root dry-to-fresh weight ratio,whereas IAA,GA4,ABA,GA3,IPA and DHZR contents were positively correlated with fleshy root sink activity at 1% significance level.Endogenous hormone promoted carrot fleshy root thickening via controlling root sink activity in summer in plateau region.