Study On The Cold Resistance And Drought Tolerance Of Eight Kinds Of Perennial Flowers In The Black Soil Region Of Northeast China

In this paper,we studied the effects of Coreopsis grandiflora Hogg?Rudbeckia hirta L.?Phlox paniculata L?Rudbeckia hirta L..?Consolida ajacis(L.)Schur?Belamcanda chinensis(L.)Redouté?Saponaria officinals ?Trib.Helenieae Cass were used as test materials.Eight kinds of perennials And the physiological and biochemical indexes such as relative conductivity,soluble sugar,soluble protein,free proline and malondialdehyde in different cultivars under low temperature and drought stress were studied.At the same time,the membership function The cold tolerance and drought tolerance of 8 flower varieties were evaluated synthetically,and the results were as follows:(1)The Chrysanthemum of Chrysanthemum morifolium Ramat.?Rudbeckia hirta L.? Saponaria officinals?Trib.Helenieae Cass.are budding period is relatively early,All in the late March or so is the growth of buds,budding period in early April or so,Coreopsis grandiflora Hogg.and Consolida ajacis(L.)Schur are budding period is the latest perennial Phlox paniculata L.and Belamcanda chinensis(L.)Redouté in the middle of April budding.Flowering long flower varieties are Phlox paniculata L.and Saponaria officinals,nearly 5 months of view of the flowering period,elamcanda chinensis(L.)Redouté and Chrysanthemum morifolium Ramat.view of the flowering period is relatively short,nearly 3 months can watch.Coreopsis grandiflora Hogg?Chrysanthemum morifolium Ramat.?Consolida ajacis(L.)Schur?Belamcanda chinensis(L.)Redouté In late September into the withered period,and the Phlox paniculata L.in October is still considerable,withering the latest.(2)The relative electrical conductivities of the eight flower roots showed an increase of the "S" curve under the low temperature stress,and the content of malondialdehyde and soluble sugar in the roots of 8 varieties increased,and the content of soluble protein The trend is more complex,some of which show a tendency to rise first and then decrease,and the other part is descending and rising.The content of free proline decreases first at the beginning of stress,and the content of proline begins to rise when the temperature is low.The order of cold resistance of 8 perennial flowers was obtained by membership function method are Belamcanda chinensis(L.)Redouté?Coreopsis grandiflora Hogg.?Rudbeckia hirta L.?Phlox paniculata L.?Saponaria officinals?Consolida ajacis(L.)Schur?Chrysanthemum morifolium Ramat?Trib.Helenieae Cass?(3)Under drought stress,the relative electrical conductivity,malondialdehyde content and soluble sugar of eight kinds of flowers showed an increasing trend,and the content of soluble protein was more complicated Coreopsis grandiflora Hogg ?Saponaria officinals and Trib.Helenieae Cass.Soluble protein content were not obvious?Chrysanthemum morifolium Ramat.?Phlox paniculata L.and Rudbeckia hirta L.Soluble protein content showed a decreasing trend?Consolida ajacis(L.)Schur and Belamcanda chinensis(L.)Redoutéwere show a "l-down" trend?The free proline content in plant leaves also increased significantly under drought stress.The order of drought resistance of 8 perennial flowers was obtained by membership function method are Coreopsis grandiflora Hogg.? Chrysanthemum morifolium Ramat.? Trib.Helenieae Cass.?Rudbeckia hirta L.? Saponaria officinals ? Belamcanda chinensis(L.)Redouté ?Phlox paniculata L.?Consolida ajacis(L.)Schur?...