【摘要】 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。更多还原

【Abstract】 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 by10.59% 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.更多还原