阔世玛对谷子幼苗农艺性状和生理指标的影响

Effects of Sigma Broad on the Agronomic Characteristics and Physiological Indices of Foxtail Millet Seedlings

以张杂5号和晋谷21号为试材,采用盆栽试验,研究了5叶期叶面喷施不同剂量(0、3.37、6.74、13.48、26.96gai·hm-2)的阔世玛对谷子幼苗主要农艺性状、光合色素含量和抗氧化系统的影响。结果表明,随着阔世玛喷施浓度的增加,张杂5号和晋谷21号幼苗的株高、叶面积、生物重、光合色素含量呈现出不断降低的趋势;MDA含量和细胞膜相对透性呈现出不断升高的趋势;而超氧化物歧化酶(SOD)和过氧化物酶(POD)的活性呈现出先升高后降低的趋势。与其他处理相比,3.37g ai·hm-2(1/4推荐剂量)的阔世玛对谷子的药害最小,26.96g ai·hm-2(2倍推荐剂量)的阔世玛对谷子的药害最大,不易缓解。同时,张杂5号对阔世玛的耐药性稍高于晋谷21号。

Pot experiment was conducted to study effects of Sigma Broad on main agronomic characteristics,photosynthetic pigment content and antioxidant system of foxtail millet through spraying Sigma Broad at five-leaf stage,with the material of＂Jingu 21＂and＂Zhangza 5＂.The result showed that,with the increasing of Sigma Broad concentration,the height,leaf area,weight and photosynthetic pigment content of foxtail millet continuously decreased;MDA content and cell membrane permeability showed an opposite trend in response to Sigma Broad;the activities of SOD and POD enzymes increased and subsequently decreased.Compared to the other controls,Sigma Broad applied at a concentration of 3.37 g ai·hm^-2（aquarter of the recommended concentration）caused the minimal phytotoxicity of millet,the largest damage was caused by Sigma Broad at the concentration of 26.96 g ai·hm^-2.In addition,the resistance to herbicide of Zhangza 5was higher than Jingu 21.