外源硅处理对不同南瓜砧木苗期生长的影响

Effect of exogenous silicon treatment on seedling growth of different pumpkin rootstocks

摘要

为明确硅对不同南瓜砧木苗期生长的影响，以3种脱黄瓜蜡粉能力不同的南瓜砧木(B04、B07为脱蜡粉材料，B06为不脱蜡粉材料)为试验材料，在人工气候室内采用水培法，设置7个浓度梯度(0、0.3、0.6、0.9、1.2、1.8、2.4 mmol·L^-1)的外源硅(Na₂SiO₃·5H₂O)处理，待幼苗长至4叶1心时进行生长指标和硅含量的测定。结果表明，不脱蜡粉南瓜苗期的生物量和根系的生长势均高于脱蜡粉材料；低于1.2 mmol·L^-1的外源硅处理对南瓜苗期的生物量和根系的生长势均起促进作用，其中0.9 mmol·L^-1促进效果最显著；1.8 mmol·L^-1外源硅处理对脱蜡粉材料起抑制作用，对不脱蜡粉材料起促进作用；2.4 mmol·L^-1外源硅处理对3种材料抑制效果显著，但不脱蜡粉材料对高浓度外源硅的耐受性强于脱蜡粉材料。南瓜幼苗地上、地下部的硅含量随外源硅浓度升高而增加，地上部硅含量始终高于地下部，且不脱蜡粉材料硅含量高于脱蜡粉材料。综上所述，外源硅对南瓜幼苗生长的影响表现为低浓度促进、高浓度抑制，不同脱蜡粉能力的南瓜材料对高浓度外源硅处理的耐受性存在差异。

Abstract

In order to clarify the effect of silicon on the seedling growth of different pumpkin rootstocks, three pumpkin rootstocks with different abilities of removing cucumber wax pollen (B04, B07 as the dewaxing powder materials, B06 as the non dewaxing powder material) were used as the test materials. The exogenous silicon (Na₂SiO₃·5H₂O) treatment was carried out with seven concentration gradients (0, 0.3, 0.6, 0.9, 1.2, 1.8, 2.4 mmol·L^-1) using hydroponic cultivation in an artificial climatic chamber. The growth indexes and silicon content were determined and analyzed when the seedlings grew to four leaves and one heart. The results showed that the seedling biomass and root growth potential of the non-dewaxed powder material were higher than those of the dewaxed powder material. The exogenous silicon treatment lower than 1.2 mmol·L^-1 promoted the seedling biomass and root growth potential, with 0.9 mmol·L^-1 having the most significant promotion effect. The treatment of 1.8 mmol·L^-1 had an inhibitory effect on the dewaxed powder material, while promoting the growth potential of the non-dewaxed powder material. The exogenous silicon treatment of 2.4 mmol·L^-1 had a significant inhibitory effect on the three materials, but the tolerance of the non-dewaxed powder material to the high concentration of exogenous silicon was stronger than that of the dewaxed powder material. The silicon content of seedlings aboveground and underground increased with the increase of exogenous silicon concentration, but the silicon content of aboveground was always higher than that of underground, and the silicon content of non-dewaxed powder material was higher than that of dewaxed powder material. In summary, the effect of exogenous silicon on the growth of pumpkin seedlings was characterized by promotion at low concentration and inhibition at high concentration, and the tolerance of pumpkin materials with different dewaxing powder ability to high concentration of exogenous silicon treatment was different.

关键词

南瓜砧木 / 外源硅 / 生长势 / 硅含量

Key words

Pumpkin rootstock / Exogenous silicon / Growth potential / Silicon content

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基金资助

河南省科技攻关计划(232102110233)

河南省科技攻关计划(232102110192)

河南省科技攻关计划(222102110394)