李秀霞 努尔麦麦提·艾麦提 齐曼·尤努斯 艾克拜尔·毛拉 陈远良

摘 要：以加工番茄87-5的幼苗为试验材料，设置Hoagland营养液钙浓度分别为0mg/L（不加钙）、160mg/L、320mg/L、640mg/L不同的钙浓度梯度胁迫处理，处理21d后测定其生长状况指标和生理指标。结果表明：不同钙浓度处理下，87-5叶片的氮磷钙含量均高于茎和根，320、640mg/L钙浓度处理下镁含量均降低，640mg/L钙浓度处理下根和茎镁浓度与对照差异显著;320mg/L钙浓度显著提高了加工番茄幼苗的根系活力，640mg/L钙浓度时叶绿素含量比对照显著降低。由此可知，钙浓度亏缺或过剩，均会影响加工番茄根系活力和各器官的钙镁元素分配，导致叶绿素合成减少。

关键词：加工番茄;钙营养胁迫;叶绿素含量

中图分类号 Q945文献标识码 A文章编号 1007-7731（2021）10-0013-04

Effects of Calcium Stress on Nutrient Allocation and Physiological Indexes of Processing Tomato Seedlings

LI Xiuxia1 et al.

（1Xinjiang Agricultural Vocational and Technical College， Changji 831100， China）

Abstract： In this study， the seedlings of processing tomato 87-5 （variety） were used as materials， the calcium concentration of Hoagland nutrient solution was 0mg/L （without calcium）， 160mg/L， 320mg/L， 640mg/L. different calcium concentration gradient stress treatments were set， and the growth status and physiological indexes were measured after 21 days. The results showed that the contents of N， P， CA in leaves were higher than those in stems and roots under different Ca concentrations， the contents of Mg in roots and stems were lower under 320mg/L and 640mg/L Ca concentrations， and there was significant difference between roots and stems under 640mg/L Ca concentrations and the control; the root vitality of processing tomato seedlings was significantly improved under 320mg/L Ca concentrations， and the chlorophyll content was significantly lower at 640mg/L Ca concentrations than that of the control. It was speculated that both deficiency and excess of calcium concentration affected root activity and distribution of calcium and magnesium in various organs of processing tomato， resulting in the decrease of chlorophyll synthesis.

Key words： Processing tomato; Calcium stress; Chlorophyll content

鈣是植物必需元素之一，是植物组织构造的重要组成成分，对植物的生理发育起着重要作用[1]。钙是细胞膜结构的组分，可稳定细胞膜、细胞壁，保持细胞的完整性，钙将细胞膜表面的磷酸盐、磷酸酯与蛋白质基桥链接起来，提高膜结构的稳定性和疏水性[2]。作为第二信使，钙还能结合在钙调蛋白（CMA）上，对植物体内多种关键酶起活化作用，对细胞代谢有调节作用[3-4]。钙的吸收、转运和储存对植物的生理功能有着重要影响[5]，适合的钙浓度才能维持植物正常的生长，钙浓度低或高会均影响植物的生长状况及生理变化。而高浓度的Ca2+是一种细胞毒害剂，若细胞内Ca2+浓度过高，将会与磷酸反应形成沉淀，从而扰乱与磷代谢有关的生理过程或妨碍正常的信号转导，进而影响植物生长[5-6]。……