漂浮育苗条件下使用多效唑对烟苗生长及生理特性的影响

在皖南烟区漂浮育苗模式下,对烟苗3叶1心期叶面喷施不同浓度多效唑,研究烤烟苗期喷施多效唑对烟苗生长及生理特性的影响,结果表明:(1)喷施多效唑对烟苗农艺性状、根系活力、叶绿素含量、NR活性、抗逆性物质及MDA含量有显著影响,影响幅度与喷施浓度有关;(2)喷施100 mg/kg、125 mg/kg多效唑,相较CK,烟苗茎高降低45.25%和52.94%,茎叶干重降低37.02%和39.45%,直径增加19.42%和27.30%,根干重增加19.53%和28.62%,根系活力提高10.59%和14.32%,叶绿素含量SPAD值提高18.12%和27.68%,NR活性提高54.51%和73.17%,可溶性糖含量提高24.66%和40.54%,可溶性蛋白含量提高24.26%和28.82%,游离脯氨酸含量提高8.47%和10.77%,MDA含量降低7.54%和8.70%,烟苗综合特性较优。

Effect of Paclobutrazol on Growth and Physiological Characteristics of Tobacco in Floating Seedling System

In the conditions of floating seedling system, this paper studied the seedling quality changes of tobacco with spraying paclobutrazol in the period of three and a primary leaves in South Anhui. The results showed that: ① Spraying paclobutrazol had significant affection on the agronomic traits, root activity, chlorophyll content, NR activity, matters of anti-adversity and MDA content of tobacco seedlings, the effect was related to different concentration. ② Compared with CK, after sprayed paclobutrazol with 100 mg/kg and 125 mg/kg, the height of stem decreased by 45.25% and 52.94%, the dry weight of stem and leaf decreased by 37.02% and 39.45%, the diameter increased by 19.42% and 27.30%, dry weight of root increased by 19.53% and 28.62%, root activity increased by 10.59% and 14.32%, the SPAD content of chlorophyll increased by 18.12% and 27.68%, the NR activity increased by 54.51% and 73.17%, the soluble sugar content increased by 24.66% and 40.54%, the soluble protein content increased by 24.26% and 28.82%, the free proline content increased by 8.47% and 10.77%, the MDA content decreased by 7.54% and 8.70%, seedling characteristics was improved and the effect was better.