Effects of Water Extract of Deoiling Cinnamomum longepaniculatum Leaves on the Growth and Cold Resistance of Rice Seedlings
Cinnamomum longepaniculatum is an economically important tree species in Sichuan Province.With the expansion of the extraction and processing industry of essential oils of Cinnamomum longepaniculatum,more and more deoiled leaf residues have been generated,and its resource utilization has become a key problem to be solved.In this study,with two rice varieties,Dexiang 4103 and Yixiangyou 2115,as materials,different concentrations of water extract of deoiling Cinnamomum longepaniculatum leaves(YZ)were sprayed on rice seedlings to study the effects of YZ on the growth and cold tolerance of rice seedlings.The results showed that the appropriate concentration of YZ in normal temperature culture significantly improved the aboveground fresh weight,seedling height and leaf age.In Dexiang 4103 and Yixiangyou 2115 treated with 50.0 g/L YZ,the active root absorption area was increased by 257.00％and 46.78％,respectively,compared with the control.100.0 g/L of YZ significantly decreased antioxidant enzyme activity and increased peroxide accumulation.Principal component analysis showed that 50.0 g/L YZ treatment had the strongest promoting effect on both varieties.Appropriate concentration of YZ effectively alleviated the inhibitory effect of low temperature stress on seedling growth,which mainly showed that the withered leaves were reduced,fresh weight,seedling height and stem diameter were significantly increased,peroxidase and catalase activities were significantly increased,and malondialdehyde content was significantly decreased.The effect of YZ on the cold tolerance of seedlings was different among varieties.Principal component analysis showed that compared with other concentrations of YZ,25.0 g/L YZ treatment could better alleviate the low temperature stress of Dexiang 4103 seedlings,while 50.0 g/L YZ treatment could better alleviate the low temperature inhibition of Yixiangyou 2115 seedlings.In conclusion,the appropriate concentration of YZ is conducive to the growth of rice seedlings and improve their cold tolerance,which will promote the resource utilization of deoiling Cinnamomum longepaniculatum leaves and promote the sustainable development of Cinnamomum longepaniculatum industry.
deoiling leaf of Cinnamomum longepaniculatumriceseedling growthcold tolerance
万方数据
维普
