调环酸钙对花椰菜幼苗生长及徒长防控效果的影响

Effect of prohexadione-calcium on the growth and quality of cauliflower seedlings

幼苗徒长问题严重影响幼苗质量,因此,有效防止幼苗徒长对花椰菜育苗意义重大。该研究以花椰菜为试验对象,共设有9个处理,在不同时期喷施不同浓度的调环酸钙(Pro-Ca),研究对花椰菜苗期生长的影响。结果表明,合适时间喷施一定浓度调环酸钙可有效抑制花椰菜幼苗株高,提高茎粗、生长函数(G值)、根冠比和壮苗指数,提升壮苗质量;此外还会提高叶片的叶绿素含量、净光合速率、蒸腾速率、细胞间隙CO_(2)浓度、气孔导度,促进光合作用;但对花椰菜幼苗的根系形态特性没有显著影响(P>0.05)。综合分析表明,A1B2组即幼苗齐苗时(播种后1周)施用150 mg·L^(-1)调环酸钙效果最好。因此,合理施用调环酸钙可有效调控幼苗株型,提高幼苗素质,利于壮苗培育。

The problem of seedling succulent growth seriously affects the quality of seedlings,and effectively preventing seedling succulent growth is of great significance for cauliflower seedling cultivation.This study focuses on cauliflower as the experimental object.There are a total of 9 treatments in this experiment,and different concentrations of calcium cyclamate(Pro Ca)are sprayed at different stages to study the impact on the growth of cauliflower seedlings.The results showed that spraying a suitable concentration of Pro-Ca at a suitable time could not only effectively inhibit the seedlings height,increase stem diameter,growth function(G value),root-to-shoot ratio,and seedling strength index,and improve the seedling quality,but also significantly increase the chlorophyll content,net photosynthetic rate,transpiration rate,intercellular CO_(2) concentration,and stomatal conductance of cauliflower seedlings.However,it had no significant effect on the root morphological characteristics of cauliflower seedlings.Comprehensive analysis showed that the best effect was to apply 150 mg·L^(-1) calcium cyclamate to the A1B2 group when the seedlings were fully grown(one week after sowing).Therefore,reasonable application of calcium cyclamate can effectively regulate the seedling type,improve seedling quality,and facilitate the cultivation of strong seedlings.